Specs_Book_2_of_4_v1.pdf

Section 04 03 00 Page 1

SECTION 04 03 00

CONSERVATION TREATMENT FOR PERIOD MASONRY

11/17

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN CONFERENCE OF GOVERNMENTAL INDUSTRIAL HYGIENISTS (ACGIH)

ACGIH 0100 (2015; Suppl 2002-2016) Documentation of the

Threshold Limit Values and Biological Exposure

Indices

ASTM INTERNATIONAL (ASTM)

ASTM A36/A36M (2014) Standard Specification for Carbon

Structural Steel

ASTM C1324 (2015) Standard Test Method for Examination and

Analysis of Hardened Masonry Mortar

ASTM C1405 (2015) Standard Specification for Glazed Brick

(Single Fired, Brick Units)

ASTM C170/C170M (2017) Standard Test Method for Compressive

Strength of Dimension Stone

ASTM C1713 (2012) Standard Specification for Mortars for the Repair of Historic Masonry

ASTM C207 (2006; R 2011) Standard Specification for

Hydrated Lime for Masonry Purposes

ASTM C615/C615M (2011) Standard Specification for Granite

Dimension Stone

ASTM C568/C568M (2015) Standard Specification for Limestone

ASTM C67/C67M (2018) Standard Test Methods for Sampling and

Testing Brick and Structural Clay Tile

ASTM E2659 (2018) Standard Practice for Certificate

Programs

ASTM E96/E96M (2016) Standard Test Methods for Water Vapor

Transmission of Materials

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NATIONAL PARK SERVICE (NPS)

NPS Hist Prop (2017) National Standards for the Treatment of

Historic Properties with Guidelines for

Preserving, Rehabilitating, Restoring, and

Reconstructing Historic Buildings

NPS TPS Brief 1 (2000) Assessing Cleaning and Water-Repellent

Treatments for Historic Masonry Buildings

THE MASONRY SOCIETY (TMS)

TMS MSJC (2016) Masonry Standard Joint Committee's

(MSJC) Book - Building Code Requirements and

Specification for Masonry Structures, Containing TMS 402/ACI 530/ASCE 5, TMS 602/ACI

530.1/ASCE 6, and Companion Commentaries

1.2 GENERAL REQUIREMENTS

It is the intent of this specification to protect the historic structure to the greatest extent possible. Use the gentlest means to perform the work and take the greatest care to ensure that the historic materials are not damaged in the process of the work.

1.2.1 Work Included:

The work of this Section consists of the repair and restoration of the exterior limestone and granite of Bradley Barracks. Work includes, but is not limited to:

a. Cleaning soiling conditions on the masonry including biological growth, water stains, and efflorescence from limestone; hreavy iron stains, and biological growth from the granite.

b. Removing and resetting masonry units to install new flashing, or replace deteriorated or improperly installed flashing and lintels.

These areas include the limestone copings, granite and gneiss above the window lintels, limestone pier caps, and copings on sally port parapets.

c. Replacing severely deteriorated limestone units, some piers caps, as indicated on the Drawings, with new limestone to match the original.

d. Retooling granite and limestone units to remove loose and deteriorated stone and to properly shed water.

e. Installing Dutchman repairs for large areas of loss with stone that matches the original in color, texture, and profile.

f. Grouting and patching masonry cracks.

g. Patching small and incipient spalls with a composite patching material that matches the original stone.

h. Replacement of failed glazed brick at west exterior basement stair.

i. Disassemble and reset displaced entry stair units.

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j. Remove failed mortar shed at coping flashing and re-point.

1.3 DEFINITIONS

Terms are defined below as applicable to this project.

1.3.1 Aggregates

The sand component of mortar.

1.3.2 Biocides

A chemical treatment that inhibits, deters, or controls organic growth. Such growth is typically removed by cleaning following biocide treatment.

1.3.3 Binder

The component of mortar that binds together the aggregate particles into a cohesive material.

1.3.4 Lime Crack Injection with Crack Injection Grout

A repair method in which a restoration grout material is injected into small cracks ranging in width from hairline to 1/8 in by use of port or syringe.

1.3.5 Consolidant

A chemical product meant to strengthen loose or deteriorated stone.

1.3.6 Dutchman

A repair method in which deteriorated stone is removed in part and replaced with salvaged, harvested or new stone to make a seamless patch.

1.3.7 Harvested

Units removed from inconspicuous areas of the building.

1.3.8 In situ

A term referencing a repair procedure in which the masonry units and mortar remain in place and are repaired without removal from the wall system

1.3.9 Joint Sealant

A flexible, chemical product that is used to create a weather-tight seal at the boundary of masonry units with other units or dissimilar materials.

1.3.10 Lead Flashing

An extruded lead material that is inserted into joints to assist in precluding water entry into the masonry.

1.3.11 Lime Wash

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A protective surface treatment comprised of calcium hydroxide particles in suspension in water, along with small amounts of calcium carbonate, silica particles and other minerals.

1.3.12 Mockup

Specific area on the building approved by Contracting Officer to demonstrate the ability to apply, match and install specified materials.

1.3.13 Mortar

A mixture of binders, aggregates, and pigments used for reconstruction, pointing/repointing or stucco applications.

1.3.14 New Elements

New, non-historic materials added to masonry structures to aid in their ability to resist loads (typically seismic) or to resist water infiltration.

1.3.15 Patch

The use of substitute repair materials to treat damaged or deteriorated masonry units in situ.

1.3.16 Remediate

An intervention of a historic masonry structure and its component materials with the intent to maintain the original fabric to the greatest extent possible.

1.3.17 Remove

Specifically for historic masonry materials, the term means to detach an item from existing construction to the limits indicated.

1.3.18 Replace

To reinstall an item in its original position (or where indicated) after remedial treatment, or to duplicate and reinstall an entire item with new material; with the original item serving as the pattern for creating the duplicate.

1.3.19 Repoint

To remove existing mortar joints to the specified depth and replace with a mortar that matches in color, texture, and performance with water vapor transmission, bond, hardness, and flexibility compatible with original mortar, as assessed in accordance with ASTM C1713.

1.3.20 Retool

A repair method in which a chisel is used to re-create the surrounding stone texture finish by removing loose pieces of stone.

1.3.21 Stucco

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A mixture of binders and aggregates, sometimes including animal hair or fibers used for the repair treatment of existing stucco.

1.3.22 Surface Treatment

The application of traditional materials or contemporary chemical products to the surface of masonry to provide protection to the masonry units and mortar and/or reduce water infiltration.

1.3.23 Test Panel

Specific area on the building approved by the Contracting Officer to demonstrate individual applicator competency and workmanship proficiency prior to the start of restoration work.

1.3.24 Tuckpointing

Often called skim-coating, an American practice of surface repairing mortar joints without the required removal of existing deteriorated mortar beneath.

This practice is not recommended for mortar joint repair work on historic masonry. There is also an acceptable British form of tuckpointing practice that involves careful thin penciling of smaller joints within larger ones to give the wall the appearance of an ashlar finish.

1.3.25 Water Repellent

A surface-applied chemcial intended to reduce liquid water entry into a masonry wall without significantly affecting the vapro transmission properties of the original material.

1.3.26 Wall System

A term used to address the fact that masonry structures are comprised of different materials but function holistically, requiring that all restoration and cleaning process take into account the implications of the treatment to the adjacent materials and the building as a whole.

1.3.27 Masonry Treatment Requirement (MTR)

Defined treatments that are required by the specification (contract) documents for project specific repairs to masonry.

1.3.28 Saturated Surface Dry (SSD)

Condition of the wall surface after water has been applied sufficient to saturate more than the surface, then allowed to dry until the surface is dry but the body of the masonry still has moisture.

1.4 ADMINISTRATIVE REQUIREMENTS

1.4.1 Pre-Installation Meeting

Prior to beginning the work of this Section, convene a meeting with the

Contracting Officer's Representative(s) to review the requirements of the

Quality Control Plan, Project Training Program, installation procedures, location of required mockup areas, and all job conditions and processes. All

Section 04 03 00 Page 6 subcontracting firms involved with this work must participate in this meeting.

1.5 SUBMITTALS

If alternate methods and materials to those specified are proposed for any phase of the work, provide written description. Provide evidence of successful use on comparable projects and demonstrate its effectiveness for use on this project.

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for Contractor Quality Control approval. Submit the following in accordance with Section 01 33 00

SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Quality Control Plan; G, RO

Project Training Program; G, RO

Qualifications; G, RO

SD-02 Shop Drawings

Photographic Documentation; G, RO

Structural Upgrades; G, RO

SD-03 Product Data

Qualifications; G, RO

Cleaning and Restoration Methods; G, RO

Cleaning Materials; G, RO

Biocides; G, RO

Replacement Mortar; G, RO

Mortar Mix; G, RO

SD-04 Samples

Mock-ups; G, RO

SD-05 Design Data

Calculations for Structural Upgrades; G, RO

SD-06 Test Reports

Testing and Matching; G, RO

Existing Sealants for Asbestos and PCBs; G, RO file://coe-nannv001nyc.nan.ds.usace.army.mil/USERS/E3/e3enmazy/SPECSINTACT/Jobs/20180320BRADLEY6/prntdata/Word/01%2033%2000.docx

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SD-07 Certificates

Repair Materials; G, RO

1.6 QUALITY CONTROL

1.6.1 Quality Control Plan

Prior to beginning restoration and cleaning work, submit a written Quality

Control Plan. Do not proceed without written approval of the Quality Control

Plan. At a minimum, include the following items in the Quality Control Plan:

a. Describe methods of dust containment during the work specific to the work of this section.

b. Describe the methods of protecting surrounding masonry, windows, doors, roof, and building trim as well as surrounding landscape. Provide drawings of protection when requested.

c. Describe the work procedures, materials, and proposed tools to use for each Masonry Treatment Requirement (MTR) specified.

d. Describe the sequence of each MTR.

e. Describe how each MTR sequence and the overall construction schedule changes with weather variations and how completed work will be protected.

f. Describe the methods for surveying and documenting original layout and collecting datum points and plumb lines for rebuilding masonry.

g. Describe the methods for shoring and providing a safe working environment. Shoring drawings and calculations to be approved by a structural engineer licensed to practice in the State of New York.

h. Describe the tools and methods for select deconstruction of individual masonry units and tools/methods for cleaning the masonry for reuse.

Include equipment, approach and length of time the masonry will be out of the wall/dwell time

i. Describe the method and approach to mortar joint removal.

j. Describe the method and approach for assuring repair material compatibility with original materials.

k. Describe the method and approach to cleaning mortar, coating, smears and old patching materials from the masonry surfaces.

l. Describe, in detail, the procedures relating to techniques and tools proposed for masonry matching.

m. Describe the complete masonry removal and matching procedures; include equipment, approach, length of time the masonry will be out of the wall, documentation on mapping the location, and where (on-site or in shop) the masonry units will be repaired.

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n. Describe the procedure for matching of different colors at different locations, including setting mortar, pointing mortar, cementitious stone patching material, stone dutchmen, and stone replacement units.

o. Describe the procedure for mixing and matching of repair materials.

p. Describe the methods and system by which the use of reclaimed masonry units can be utilized.

q. Describe the methods for setting masonry back into its original position and maintaining the original bond patterns and joint width.

r. Describe the methods of transition points where replacement/preservation work will meet the original historic work.

s. Describe the on-site project training program. Provide the opportunity for workers to be trained in each masonry treatment requirement (MTR) as work proceeds.

t. Provide documentation for mapping the locations and the method for labeling the stone to be reset. Submit a storage plan for all stone that is to be removed and salvaged.

1.6.2 Qualifications

1.6.2.1 Historic Masonry Consultant

a. Secure the services of a historic masonry consultant with a minimum of 10 years' experience applying NPS Hist Prop as they relate to the work in this section.

b. Submit a resume that describes five relevant projects within that period and include how NPS Hist Prop was applied to the work of similar scope and scale and what jurisdiction or agency was involved in approving the work.

c. The consultant's services include:

(1) Investigating the condition of the masonry materials and mortar.

(2) Arranging for material analysis in the laboratory

(3) Recommending appropriate cleaning methods and materials

(4) Recommending restoration options.

(5) Providing project specific specifications.

(6) Providing an on-site training program.

(7) Providing quality control services during construction.

(8) Recommending appropriate repair and restoration materials.

1.6.2.2 Masonry Firm

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a. The firm performing the masonry work must have a minimum of five years experience on relevant projects.

b. The firm must have completed work similar in material, design, and extent to that indicated for this Project and demonstrate a record of successful in-service performance.

c. Proven implementation of NPS Hist Prop and related Preservation Briefs are required.

d. Submit a resume that describes the required experience.

1.6.2.3 Field Supervisor

Retain an experienced full-time supervisor on the project site at all times when masonry restoration is in progress. A single individual must be responsible for supervising the historic masonry restoration work throughout the duration of the project.

Submit a resume that describes the required experience.

1.6.2.4 Masonry Applicator

a. Employ craftspeople who are experienced with and specialize in restoration work of the types they will be performing.

b. All masonry restoration treatments must be performed by a craftsperson that is familiar with historic masonry construction and has worked on historic masonry projects for at least five years.

c. Only skilled technicians who are familiar and experienced with the materials and methods specified may be used.

d. Submit resumes for all historic masonry applicators, demonstrating the required experience.

1.6.3 Project Training Definition and Use

In addition to five years demonstrable experience on masonry restoration projects, offer workers project training certificate(s) within the framework of ASTM E2659. Project training certificates are earned by individual workers and issued with the understanding that they are for limited time use, enforceable only to this specific project and for a specific MTR. It is not necessary, nor a requirement of this specification, that all restoration workers obtain all project training certificates offered. Rather it is desirable that workers be trained for each project specific task they will perform to ensure the highest quality results from the cleaning and restoration program.

1.6.4 Mortar Analyst

Laboratory mortar analysis equipment should be operated by and results analyzed by trained personnel experienced with analysis of historic masonry mortar.

1.6.5 Documentation

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Submit digital photographic documentation of the all phases of masonry restoration, including prior to the start of restoration work.

Provide thorough photo documentation of the project and project details and targeted areas.

1.6.6 Cleaning and Restoration Methods

1.6.6.1 General Procedure

a. Submit the cleaning and restoration methods, and materials selected for a specific structure for approval before work starts.

b. Perform cleaning and restoration mock-ups for approval before proceeding with work. Take into account the total construction system of the building to be worked upon, including different masonry and mortar materials, as well as non-masonry elements which may be affected by the work.

c. Utilize mockups to identify the appropriate cleaning and restoration treatment and materials and set the standard for each project task.

d. Demonstrate the correct execution of the approved cleaning and restoration methods and materials during the on-site workmanship training program within the framework of ASTM E2659.

1.6.6.2 Cleaning Products and Procedures

1.6.6.2.1 General Cleaning Requirements

a. Establish cleaning products and procedures during the mockup process.

b. Select the least aggressive method used to achieve the desired level of cleanliness.

c. Where chemical products are selected for cleaning, use them in accordance with the manufacturer's instructions.

1.6.6.2.2 Cleaning Mock-Ups

a. Demonstrate the materials, equipment, and methods to be used in cleaning in a test section approximately 3 feet by 3 feet.

b. Locate test patches in inconspicuous areas of the building. The areas tested are subject to approval by the Contracting Officer. The areas tested must exhibit soiling characteristics representative of those larger areas to be cleaned.

c. Adjust the cleaning process as required and the test section rerun until an acceptable process is obtained.

d. Allow tested areas to dry before a determination is made on the effectiveness of a particular treatment.

1.6.7 Masonry Restoration Products and Procedures

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1.6.7.1 General Restoration Requirements

a. Do not use masonry or mortar in the work until the mock-ups and the represented material and workmanship have been submitted and approved.

b. Demonstrate the methods and quality of workmanship to be performed in each masonry treatment requirement (MTR). Provide a mock-up for each MTR indicated.

1.6.7.2 General Restoration Mock-Up Requirements

a. Throughout restoration, retain approved mock-up panels in undisturbed condition, suitably marked, as a standard for judging completed work.

b. Review manufacturer's product data sheets to determine suitability of each product for each surface.

c. Apply products using manufacturer-approved application methods, determining actual requirements for application.

d. Obtain approval as to the preservation treatment approach, design, and workmanship to include, but not limited to the verification of all material applications and finishes as specified to the requirements of color, texture, profiles, and finishes before proceeding with work.

e. May be performed on inconspicuous sections of actual construction under the same weather conditions expected the remainder of the work.

f. Repair unacceptable work.

1.6.7.3 Restoration Mock-Ups

1.6.7.3.1 Retooling Stone Masonry In Situ

Demonstrate treatment technique and methods to retool three deteriorating gneiss/granite units in situ to remove the loose material.

1.6.7.3.2 Masonry Removal and Replacement

Demonstrate techniques for removing the affected masonry without damaging the surrounding masonry and materials scheduled to remain.

Fully remove masonry unit and replace to specified dimensions and texture.

Select size of masonry units representing typical conditions. Select masonry unit for replacement mock up from units identified for replacement in base contract scope. Return one masonry unit to same location, set to surrounding profile joint width and bond pattern. Set masonry unit using specified mortar. Confirm with Contracting Officer's Representative that the replacement masonry units meet specification requirements for matching and that sufficient quantity required for the work have been identified. Leave one stone dry-set into opening set on wood shims for evaluation and approval of preparation conditions.

1.6.7.3.3 Substitute Repair Material

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1.6.7.3.3.1 Patching

Apply repair material on at least two masonry units for repair. Include one masonry unit on which to demonstrate proficiency in removing previous patching material and repairing with new substitute repair material. Include the removal of metal anchors at two locations and fill in the holes with repair material on the second masonry unit (where applicable).

1.6.7.3.3.2 Dutchman

Undertake dutchman repairs in two locations, including one that is only cut and prepared for application. Demonstrate the quality of the stone insert, as well as the workmanship and techniques to be performed in the dutchman repairs. Do not proceed with other dutchman repairs until the technique has been approved.

1.6.7.3.4 Crack Repair

Repair one crack, 1 foot in length, using injection grouting procedure.

1.7 DELIVERY, STORAGE, AND HANDLING

a. Furnish cement in suitable bags used for packaging cements.

b. Provide packages with labeling that clearly defines contents, manufacturer, and batch identification.

c. Provide detergents, masonry cleaners, solvents, epoxies and other chemicals and repair materials used for masonry cleaning and restoration in sealed containers that legibly show the designated name, formula or specification number, quantity, date of manufacture, manufacturer's formulation number, manufacturer's directions including any warnings and special precautions, and name of manufacturer and other pertinent information.

d. Store materials for use in the work of this section under environmental conditions recommended by the manufacturer. Store materials in weathertight structures which will protect all materials from moisture and contaminants.

e. Store accessories to avoid contamination and deterioration.

f. Do not use admixtures which have been in storage onsite for six months or longer, or which have been subjected to freezing, unless retested and proven to meet the specified requirements.

1.8 PROJECT/SITE CONDITIONS

1.8.1 Environmental Requirements

a. Do not place materials when weather conditions adversely affect the quality of the finished product.

b. Do not place masonry or mortar when the air or surface temperature is below 40 degrees F in the shade and will remain so for at least 48 hours

Section 04 03 00 Page 13 after completion of the work. Heated enclosures may be used to overcome ambient weather restrictions, where such enclosures are feasible.

c. Do not place masonry or mortar when air or surface temperature is above

90 degrees F with a wind speed above8 miles per hour and will remain so for at least 48 hours after completion of the work.

d. Do not place masonry or mortar when air or surface temperature is above

100 degrees F with or without wind and will remain so for at least 48 ours after completion of the work.

e. Do not perform work or place materials during periods of rain or other precipitation. Stop material placements, and protect all in-place material from exposure, during periods of rain or other precipitation.

f. Clean masonry surfaces when air temperatures are above 40 degrees F and will remain so until masonry has dried out, but for not less than 7 days after completion of the work.

g. Do not perform work in wind conditions that may blow materials onto surfaces not intended to be treated.

1.8.2 Masonry Installation Requirements

a. Phase work during hot weather by performing work on the shady side(s) of the building during daylight hours and on the daylight side(s) of the building during cooler evening hours to prevent premature evaporation of the water from the mortar.

b. Do not use frozen materials or materials mixed or coated with ice or frost. Do not apply materials to frozen surfaces; allow complete thawing prior to installation.

c. Do not lower the freezing point of mortar by the use of admixtures or anti-freeze agents. Do not add chlorides or admixtures containing greater than 0.2 percent chlorides to the mortar, per TMS MSJC.

d. Prevent mortar from staining the face of the masonry or other exposed surfaces. Immediately remove mortar that comes in contact with such surfaces. Cover partially completed work when work is not in progress.

Protect sills, ledges and projections from mortar droppings. Building damage resulting from work of this Section is the Contractor's responsibility. Restore damaged areas to the satisfaction of the Owner at no expense to the Owner. Do not apply products under conditions outside product manufacturer's requirements.

1.9 WARRANTY

1.9.1 Cleaning Warranty

Warrant cleaning procedures for a period of two years against harm to substrate (masonry and mortar) or to adjacent materials including, but not limited to discoloration of substrate from improper procedures or usage, chemical damage from inadequate rinse procedures, and abrasive damage from improper procedures.

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1.9.2 Repair Warranty

Warrant repair procedures, including pointing, for a period of two years against: discoloration or mismatch of new mortar to adjacent original historic mortar, discoloration or damage to masonry from improper mortar clean-up, loss of bond between masonry and mortar, fracturing of masonry edges from improper mortar joint preparation procedures or improper mortar formulation, and occurrence of efflorescence from improper repair procedures.

PART 2 PRODUCTS

2.1 CLEANING MATERIALS

2.1.1 General Requirements

Selection of appropriate cleaning products requires a clear understanding of the masonry materials to be cleaned, a rationale for the cleaning, and an understanding of the anticipated level of cleanliness expected from the cleaning program. Overly aggressive cleaning methods and materials can cause subtle, long-term damage to masonry units. Use products that have a minimum

5 year performance record on relevant projects. Select the products predicated on long-term negative effects to the masonry rather than current level of cleanliness of the comparable structure.

2.1.2 Chemical Cleaners

a. Provide commercially available products that have a proven record of cleaning masonry without altering, damaging or discoloring the masonry units, mortar or surrounding materials. Use cleaners that are specifically formulated for use on the substrate to be cleaned.

b. Provide the associated pre and post treatment material to neutralize the long term effects of the chemicals.

c. Acceptable Limestone Cleaners include:

1. Sure Klean Light Duty Restoration Cleaner, manufactured by ProSoCo, Inc., 3741 Greenway Circle, Lawrence, KS 66046, Tel: (800) 255-4255, Fax: (785) 830-9797

2. ABR BW3 Blue Gel, manufactured by ABR Products, Inc., 9720 South 60th

Street, Franklin, WI 53121, Tel: (800) 346-7532.

3. Sure Klean 766 Limestone and Masonry Prewash, followed by Limestone and Masonry Afterwash, manufactured by ProSoCo, Inc., 3741 Greenway

Circle, Lawrence, KS 66046, Tel: (800) 255-4255, Fax: (785) 830-9797

4. Safe 'n Easy Architectural Cleaner, manufactured by Dumond Chemicals, 1475 Phoenixville Pike, Suite 18, West Chester, PA 19380, Tel: (800)

245-1191

5. Safe 'n Easy Limestone Cleaner, manufactured by Dumond

Chemicals,Inc., 1475 Phoenixville Pike, Suite 18, West Chester, PA

19380, Tel: (800) 245-1191.

6. MasonRE B All Purpose Cleaner, manufactured by Cathedral Stone

Products, 7266 Park Circle Drive, Hanover, MD 21076, Tel: (800) 684-

0901.

7. MasonRE B+ Advanced Multi-Surface Cleaner, manufactured by Cathedral

Stone Products, 7266 Park Circle Drive, Hanover, MD 21076, Tel: (800)

684-0901.

8. Or approved equal

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2.1.3 Biological Growth Removers

a. Use biological growth removers that are chemical treatments designed to remove organic growth from masonry. Provide any associated post-treatment materials, as required, to neutralize the long-term effects of the chemicals.

b. Acceptable Biological Growth Removers include:

1. D/2 Biological Solution, available from Limeworks.us, PO Box 151, Milford Square, PA 18935, Tel: (215) 536-6706, Fax: (215) 536-2281

2. EnviroKlean ReKlaim, manufactured by ProSoCo, Inc., 3741 Greenway

Circle, Lawrence, KS 66046, Tel: (800) 255-4255, Fax: (785) 830-9797

3. EnviroKlean ReVive, manufactured by ProSoCo, Inc., 3741 Greenway

Circle, Lawrence, KS 66046, Tel: (800) 255-4255, Fax: (785) 830-9797

4. Or approved equal.

2.1.4 Iron Stair Removers

a. Provide chemical cleaners specifically designed to solubilize and remove iron stains from a variety of masonry surfaces.

b. Acceptable products include:

1. Safe 'n Easy Masonry Rust Remover, manufactured by Dumond Chemicals, Inc., 83 General Warren Boulevard, Suite 190, Malvern, PA 19355, Tel:

(800) 245-1191, Fax: (609) 655-7725

2. MasonRE Light Duty Rust Remover, manufactured by: Cathedral Stone

Products, 7266 Park Circle Drive, Hanover, MD 21076, Tel: (800) 684-

0901.

3. Or approved equal.

2.1.5 Liquid Strippable Masking Agent

Provide manufacturer's standard liquid, film-forming, strippable masking material for protecting glass, metal, and polished stone surfaces from the damaging effect of acidic and alkaline masonry cleaners.

2.1.6 Cleaning Implements

Furnish brushes that contain natural or nylon fiber bristles only. Do not use metallic wire brushes. Use scrapers and application paddles made of wood with rounded edges. Metallic tools are not permitted.

2.1.7 Water

Obtain potable water from a local source. Filter to remove minerals resulting in a neutral pH, prior to application.

2.2 REPAIR MATERIALS

2.2.1 General

Use repair materials of one type and from one source, when used in repair treatments that will have surfaces exposed in the finished structure.

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2.2.2 Mortar and Stucco

2.2.2.1 Testing and Matching

a. Take test specimens of existing mortar from a sound and intact representative portion of the structure, at locations indicated by the

Contracting Officer's Representative and assess in accordance with ASTM

C1713 and ASTM C1324.

b. Aggregate Analysis

(1) Separate aggregate of the mortar sample from the binder by taking the crushed mortar sample and chemically separating the aggregate from the binder.

(2) Rinse the separated aggregate clean with water and dry. Examine the aggregate with a magnifying glass, and record the component materials as to range of materials, sizes, colors, as well as the presence of other materials.

(3) Perform sand analysis using a sieve analysis of the aggregate as part of the ASTM C1324 process.

c. Match the replacement mortar to the original existing material in color, texture and tooling.

2.2.2.2 Replacement Mortar

Provide replacement mortar that will:

a. Coexist with the old in a sympathetic, supportive and, if necessary, sacrificial capacity.

b. Have greater vapor permeability and be softer (measured in compressive strength) than the masonry units.

(1) Measure water vapor transmission in accordance with ASTM E96/E96M.

(2) Prepare ASTM E96/E96M water vapor transmission specimens with thickness similar to that expected in service, or a maximum of 1/2 inch, whichever is thinner.

c. Be as vapor permeable, and as soft, or softer, (measured in compressive strength) than the existing historic mortar or stucco.

2.2.2.3 Binder Content

Provide binder type or mixture of mortar with a cement, lime, or combination thereof consistent with the original existing mortar content in order to provide uniform durability, weathering characteristics, and the same, or better, life-cycle performance expectations.

2.2.2.4 Pointing Mortar

Pre-blend pointing mortar in single containers in a factory-controlled environment. Pointing mortar may be site mixed, Type N. Use lime for repointing mortar that conforms to ASTM C207.

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2.2.2.5 Admixtures

Do not use admixtures in the mortar unless specifically approved in writing by the Contracting Officer.

2.2.3 Replacement Masonry Materials

2.2.3.1 Glazed Clay Brick

a. Provide replacement brick matching color, shape, size, texture, appearance, and thermal expansion properties of the existing historic brick.

b. Test brick in comparison to the original existing brick using ASTM

C67/C67M.

c. Do not use reclaimed brick unless approved by Contracting Officer.

d. New Glazed Brick shall comply with ASTM C1405 - 12 Standard specification for Glazed Brick (single file brick units).

2.2.3.2 Stone

a. Provide replacement stone matching type, color, shape, size, texture, finish-profile, and compressive strength of the existing historic stone units.

b. Test replacement stone in comparison to the existing historic stone using

ASTM C170/C170M.

c. New granite must comply with ASTM C615/C615M; Standard Specification for

Granite Dimension Stone.

d. New limestone must comply with ASTM C568/C568M Standard Specification for

Limestone Dimension Stone.

2.2.3.3 Masonry Elements

2.2.3.3.1 Anchors and Accessories

a. Provide anchors of type and size required to support stone Dutchmen and stone installations. Anchors shall be Stainless Steel, AISI Type 302 or

304.

b. Provide hardwood, slate, or plastic shims, non-staining to stone, sized to suit joint thickness and bed depths.

c. Rods/Pins: Stainless steel threaded rods sized for each type of repair for stone Dutchmen or reattachment of pieces where necessary.

2.2.3.3.2 Lead Flashing

Lead flashing conforming to GSA HPTP 07656-01 shall be a commercially available product designed for installation in mortar joints to help protect against water infiltration.

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2.2.4 Adhesives

a. Akepox 5000, epoxy based stone adhesive, UV stable, knife grade, by:

Akemi, (US Contact) INNOCHEM innovative Chemicals, 4030 Pleasantdale Road, Suite F, Doraville, GA 30340

Tel: (770) 409-8789 or (877) G0-AKEMI.

b. Sikadur 31, Hi-Mod Gel as manufactured by Sika Corporation, 201 Polito Avenue, Lyndhurst, NJ 07071

Tel: (800) 933-SIKA.

c. Or approved equal.

2.2.5 Miscellaneous Materials

2.2.5.1 Cementitious Grout

Use cementitious grout, recommended by the manufacturer for the application, to bond steel anchors to masonry.

2.2.5.2 Metal Attachments

a. Provide threaded or deformed stainless steel anchors for spall repairs, size as indicated.

b. Provide other plates, angles, anchors, and embedments conforming to ASTM

A36/A36M, prime painted with inorganic zinc primer.

2.3 EQUIPMENT

2.3.1 Cleaning Equipment

Provide cleaning equipment that does not cause staining, erosion, marring, or other damage or changes in the appearance of the surfaces to be cleaned.

2.3.1.1 Sandblasting

Use of sandblasting equipment is not allowed for cleaning masonry surfaces.

2.3.1.2 Water Blasting

a. Use of water blasting equipment is not allowed for cleaning masonry surfaces.

2.3.1.3 Cleaning Implements

a. Furnish application and scrub brushes that contain natural or nylon fiber bristle only. Do not use wire brushes.

b. Scrapers and application paddles shall be made of wood or plastic.

Metallic tools are not permitted.

c. Full-range pH testing strips are required to ensure the proper removal and rinsing of cleaners.

2.3.2 Spray Equipment

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a. Provide spray equipment for chemical cleaners with low-pressure tanks or chemical pumps suitable for chemical cleaner indicated, and equipped with stainless steel, cone-shaped spray-tip.

b. Disperse water through a fan-shaped spray tip at an angle of not less than 15 degrees.

c. Deliver water at a pressure not greater than 400 psi and at a volume between 2.5 and 3 gpm.

d. Deliver heated water at flow rates indicated maintaining between 140 and

180 degrees F.

2.3.2.1 Grout Injection Implements

Provide syringes or other tools to inject grout into cracks.

2.3.2.2 Tools

a. Hand tools shall be used unless there is prior written approval of tool types, locations and mechanics by the Contracting Officer.

b. Use of rotary grinders, power saws, power chisels, or any other power tools will be permitted only with prior written approval of tool types, locations, and specific mechanics by the Contracting Officer. If mechanical grinders are approved for cutting the joints, the blade must be no larger than four (4) inches in diameter.

c. Chisels shall be narrower that the joints in which they are used.

d. Brushes for cleaning areas to be replaced shall be stiff, natural or nylon bristle brushes.

e. Drilling Equipment

1. Use standard small, powered, handheld masonry drills, commonly used for drilling small holes in concrete and masonry to drill holes in masonry for patch anchors and other applications.

2. Use drills in rotary mode only. Do not use impact type drills.

2.3.3 Compressed Air Supplies

a. Use compressed air equipment that delivers clean, oil and moisture free compressed air at the surface to be cleaned. Use a minimum of two in-line air filters to remove oil and moisture from the air supply.

b. Test the compressed air supply during each shift for the presence of oil and moisture.

2.3.4 Material Handling and Associated Equipment

2.3.4.1 Mixing, Transporting, and Placing Job Materials

a. Provide equipment used for mixing, transporting, placing, and confining masonry and mortar placements capable of satisfactorily mixing material and supporting uninterrupted placement operations.

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b. Provide equipment used for mixing, conveying, and placing of materials that is clean, free of old materials and contaminants, and in conformance with material manufacturer's recommendations.

2.3.4.2 Associated Equipment

Provide associated equipment, such as mixer timing equipment, valves, pressure gauges, pressure hoses, other hardware, and tools, as required to ensure a continuous supply of material and operation control.

2.4 MORTAR MIX

2.4.1 General

a. Proportion materials appropriately with regard to the effect of moisture content on the individual components (cement, sand and lime).

b. Batch materials using volumetric measurement devices and consistently consolidate the material in these devices to ensure the uniformity of the mortar. Do not batch by shovel counts.

2.4.2 Batching

a. Utilize a calibrated measuring device for batching Portland cement.

b. Utilize a calibrated measuring device for batching hydrated lime or lime putty.

c. Utilize a calibrated measuring device for batching the sand.

2.4.3 Cement and Lime Proportions

a. Fill the measuring device with portland cement, hydrated lime or lime putty.

b. Briskly strike the bottom of the measuring device against the ground a minimum of ten times and then strike the top flush.

c. For dry hydrate lime, fill the measuring device using a minimum of three lifts, strike the bottom of the measuring device against the ground a minimum of ten times for each lift and then strike the top flush. Mix dry hydrate lime to a wet paste that is 40 to 42 percent solid.

d. For lime putty briskly strike the bottom of the measuring device against the ground a minimum of ten times and then strike the top flush. No additional lime is required when measuring from putty.

2.4.4 Sand Proportions

a. Proportion sand when the sand is in saturated surface dry (SSD), loose damp condition.

b. Proportion the sand by filling a measuring device using a minimum of three lifts, striking the sides a minimum of ten times, and then striking the top flush.

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PART 3 EXECUTION

3.1 EXAMINATION

a. Contractor shall examine substrates, supports and conditions under which this work is to be performed and notify the Contracting Officer, in writing, of conditions detrimental to the proper completion of the work.

Do not proceed with work until unsatisfactory conditions are corrected.

Beginning work signifies installer's acceptance of substrates and conditions.

b. Use the gentlest means to perform the work and take the greatest of care to ensure that the historic materials are not damaged in the process of the work, as established by mock-ups and testing.

c. In addition to requirements in this Section, comply with NPS Hist Prop.

3.1.1 Taking and Preparation of Samples

a. Take and analyze samples of unweathered original historic mortar and different types of mortar in the structure in order to match the new mortar to be used for pointing.

b. Remove three or four samples of each type of mortar to be matched with a hand chisel from several locations on the building. Mortar samples to be intact pieces with a minimum size of 1 ounce.

c. Set aside the largest sample for comparison with the pointing mortar.

d. Place the remaining samples in labeled, sealed sample bags for transport to the laboratory for evaluation per Part 2 of this Specification.

3.2 PREPARATION

3.2.1 Protection

a. Protect persons, motor vehicles, adjacent surfaces, surrounding buildings, equipment, and landscape materials from chemicals used and runoff from cleaning operations.

b. Erect temporary protection covers, which will remain in operation during the course of the work, over pedestrian walkways and at personnel and vehicular points of entrance and exit.

c. Protect the interior of buildings from the weather, cleaning, and repair operations at all times.

d. Do not expose workers to chemical substances in excess of the limits established by ACGIH 0100. Comply with more stringent regulations where applicable.

3.2.2 Surface Preparation

a. Do not proceed with cleaning until mock-ups have been approved.

b. Do not proceed with pointing until existing mortar has been analyzed and suitable repair material has been determined.

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c. Do not proceed with restoration work until the cause of observed distresses have been identified and corrected.

d. Use products in accordance with manufacturer's instructions

3.2.3 Equipment and Techniques Demonstration

a. Demonstrate equipment and techniques of operation in an approved location.

b. Assemble dependable and sufficient equipment, appropriate and adequate to accomplish the work specified, at the work site with sufficient lead time before the start of the work to permit inspection, calibration of weighing and measuring devices, adjustment of parts, and the making of any repairs that may be required.

c. Maintain the equipment in good working condition throughout the project.

3.3 MASONRY CLEANING

3.3.1 General

a. Exercise caution against over-cleaning of surfaces, which may be detrimental, and which may remove desirable historic surface details or patinas. For example, if cleaning reveals unexpected joint painting or historic signage; suspend the cleaning action, protect the exposed area and notify the Contracting Officer.

b. Do not damage or mar historic materials in the process of cleaning.

c. Perform cleaning per NPS TPS Brief 1.

d. Use products in accordance with manufacturer's instructions.

e. Protect open joints to prevent water and cleaner intrusion into the interior of the structure.

f. Protect non-masonry materials and severely deteriorated masonry by approved methods prior to initiation of cleaning operations.

g. Immediately remove all spills or stains on adjacent surfaces and restore affected surfaces at no expense to the owner.

h. Comply will all Local, State and Federal Regulations regarding the containment and disposal of effluent.

i. Remove all organic and inorganic contaminants from the surface and pores of the substrate, without causing any short or long-term negative consequences.

j. Re-application of cleaners may be required to achieve a uniform level of clean.

k. Selective stain removal may be necessary in some locations following cleaning. This shall be done with approved chemical cleaner or poultice with the approval of the Architect and Contracting Officer.

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l. Do not affect the density, porosity, or color of the existing masonry or mortar.

m. Maintain a neutral pH on surface of cleaned masonry units.

n. Use the gentlest methods possible for cleaning historic masonry to achieve the desired results.

o. Proceed with cleaning in an orderly manner, working from top to bottom of each scaffold width and from one end of each elevation to the other.

p. Perform cleaning in a manner which results in uniform coverage of all surfaces, including corners, moldings, interstices and which produces an even effect without streaking or damage to masonry.

q. Use the following sequence of methods to determine the least aggressive, effective cleaning method:

(1) Water with non-metallic brushes (cold water).

(2) Water with mild soap

(3) Water with stronger soap

(4) Water with stronger soap plus ammonia

(5) Water with stronger soap plus vinegar (but not on calcareous masonry)

(6) Stronger chemical cleaners, only when above methods are determined to be ineffective by the Contracting Officer

r. Finished work shall show no signs of stains, scratches, streaks or runs of discoloration from use of cleaners. Leave all exposed surfaces neat and clean.

s. After rinsing and neutralization, as required, cleaned masonry surfaces shall be pH neutral. This shall be confirmed using pH test strips.

3.3.1.1 Biological Growth Removal

a. Where possible, macro-biological growth and root systems shall be removed by hand.

b. Treat surface growths with a biological growth remover.

c. Mix and dilute the cleaner as recommended by the manufacturer and as determined in the mock-ups.

d. Apply cleaner to a dry surface using a brush, roller, or pump sprayer.

e. Scrub surface thoroughly with a non-metallic, long-fibered scrub brush.

f. Allow the cleaner to remain on the surface for the dwell time recommended by the manufacturer or as determined during the mockups. Apply additional cleaner to maintain a wet surface. Lightly mist with water and continue scrubbing.

g. Rinse the surface using clean water performed with a fan tipped, water pressure washer, with pressures not to exceed 500psi.

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h. Depending on the product, apply neutralizing agents according to the manufacturers' instructions. Rinse until the pH of the cleaned stone surface reads neutral, or that of the rinse water.

i. Re-apply if necessary.

3.3.2 Chemical Cleaners

a. Do not use chemical cleaners without approval from the Contracting

Officer.

b. Do not use acidic chemical cleaners on limestone, marble, concrete and other calcareous (calcium containing) masonry materials. If chemical cleaners are used on such materials, use alkaline based cleaners with neutralizing afterwashes.

3.3.3 Water Cleaning

3.3.3.1 Low-Pressure Spraying

a. Spray apply water to masonry surfaces to comply with requirements indicated by test patches for location, purpose, water temperature, pressure, volume, and equipment.

b. Unless otherwise indicated, wash the surface with clean, low pressure water (pressure of less than 55 psi and 2.5 to 3 gpm discharge) and hold spray nozzle not less than 12 inches from surface of masonry.

c. Apply water side to side and top to bottom in overlapping bands to produce uniform coverage.

3.3.3.2 Hand Scrubbing

a. Scrub surfaces to be cleaned to remove surface contaminants.

b. Pre-wet surfaces and use hand-held natural bristle or nylon brushes.

c. Do not use wire brushes.

3.3.3.3 Rinsing

a. Rinse scrubbed surfaces clean of all contaminants and cleaning solutions with water in a low-to-moderate pressure spray, working from top to bottom of each treated area.

b. Remove all traces of contaminants and cleaning solutions.

3.3.4 Chemical Cleaning

3.3.4.1 General

a. Chemical cleaning is the use of any product in addition to water, including detergents, ammonia, vinegar, and bleach.

b. Use gentlest means possible to achieve the desired result as determined by test patches.

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c. Proceed in an orderly manner, working from top to bottom of each scaffold width and from one end of each elevation to the other.

d. Provide uniform coverage of all surfaces, including corners, moldings, interstices and produce an even effect without streaking or damage to masonry.

e. Do not apply chemical cleaners to the same masonry surfaces more than twice.

3.3.5 General Soiling and Water Stain Removal from Limestone

a. Pre-wet surface of masonry surface with water.

b. Dilute the product, if required, according to the manufacturer's recommendations, or as determined during the mock-ups.

c. Apply cleaner with a natural bristle brush, or as determined by the field test panels. Gently agitate the surface with the brush.

d. Allow the cleaner to dwell for the recommended or approved period of time. Do not allow chemicals to dry on the surface. Reapply chemical cleaner as needed to maintain a moist surface.

e. Rinse the surface using clean, pressurized water. The pressure washer must be equipped with a fan-tipped nozzle and water pressures must not to exceed 500psi.

f. Neutralize cleaner, if required, according to the manufacturer's recommendations.

g. Rinse the surface using clean, pressurized water. The pressure washer must be equipped with a fan-tipped nozzle and water pressures must not to exceed 500psi. Rinse until the pH of the cleaned surface reads a pH of

8, or that of the rinse water.

h. Re-apply the cleaner if necessary.

3.3.6 Iron Stain Removal from Gneiss

Depending on the results of the tests and mockups, the iron stains may or may not require removal using poultices.

3.3.6.1 Iron Stain Removal, Using Liquid Chemical Cleaner

a. Dilute the product, if required, according to the manufacturer's recommendations, or as determined during the mock-ups.

b. Apply cleaner to a dry surface with a natural bristle brush, or as determined by the field test panels. Gently agitate the surface with the brush.

c. Allow the cleaner to dwell for the recommended or approved period of time. Do not allow chemicals to dry on the surface.