Statement of Work.pdf

Pictured Rocks National Lakeshore

Au Sable Light Station Interior and Exterior Repairs

PROJECT SPECIFICATIONS

NATIONAL PARK SERVICE

February 14, 2020

TABLE OF CONTENTS

DIVISION 01 ‐ GENERAL REQUIREMENTS

Section 01 10 00 ‐ Division 01 Short Form General Requirements

DIVISION 04 – Masonry

Section 040120.64 – Brick Masonry Repointing Section 040140.62 ‐ Stone Repointing

Division 09 – Finishes

Section 09280 ‐ Plaster Restoration

Section 099123 ‐ Interior Painting

Section 099300 – Staining and Transparent Finishing

DRAWINGS and Photographs

1. Submittal Checklist Attachment (end of this document)

2. Elevation Photos and Elevation‐Floor Plans with Building Dimensions Attachment (end of this document)

3. Paint/Plaster Repair Schedules, Plaster and Flooring Repair Photos, and Interior Floor Plans (end of this document)

DIVISION 01 ‐ GENERAL REQUIREMENTS Section 01 10 00 ‐ Division 01 Short Form General Requirements

PART 1 – GENERAL

ITEM 1 ‐ DESCRIPTION OF WORK

1.1 Background:

The HS‐11 Single Keepers Quarters building is located at the former Au Sable Coast Guard Station. This building was constructed in approximately 1909 and is located on the Lake Superior shoreline where it is continually exposed to the severity of all wind and weather events. The building serves as a museum and open to the public for guided tours servicing over 4,000 visitors annually.

1.2 Work Covered by the Contract Documents:

Project Location:

Pictured Rocks National Lakeshore

E18850 County Road H‐58

Grand Marais, MI 49839.

Work consists of: Interior and exterior repairs broken‐down into two parts as follows:

A. PART 1 Exterior Repairs as follows: Remove loose and damaged exterior wall mortar joints then repoint the brick mortar joints with mortar representing the period on approximately 3200 square feet of historic building brick face. Contractor responsible for providing 3rd party mortar analysis and mortar mix recommendation. Repointing locations include all window lintels, windowsills, entire vertical joint at intersection of original building with building addition on the east side, and areas of walls to be identified by Contractor and Contracting Officer Representative (COR). It is anticipated that

100% (880 linear feet) of the above grade exterior stone foundation requires repointing. The existing stone mortar is not to be replicated in terms of color/consistency. The new stone repointing mortar should be based on the mortar analysis and mortar mix specification for the brick mortar. It is anticipated that approximately 30% of the exterior brick face requires repointing.

B. PART 2 Interior Repairs as follows: Repair, paint and refinish approximately 13,000 square feet of interior plaster walls, floors, and ceilings. It is estimated approximately 500 square feet of plaster walls and ceilings will need to be repaired prior to painting. Note that building was constructed prior to

1978, however, extensive renovation work performed during approximately 1990 included lead‐based paint (LBP) abatement. Most resent testing performed by park staff resulted in negative findings.

1. Repair approximately 500 square feet of damaged and deteriorated plaster using materials that match existing adjacent surfaces to the fullest extent possible with regard to visual effect.

2. Prepare and paint approximately 2,125 square feet of ceilings (8’ 6” in height more or less)

3. Prepare and Paint approximately 5,562 square feet of walls (8 ’6” in height more or less)

4. Prepare and paint approximately 1,675 square feet wood floors.

5. Replace 18 square feet of damaged hardwood flooring using materials that match existing adjacent surfaces to the fullest extent possible with regard to visual effect.

6. Sand, stain and clear coat approximately 414 square feet of hardwood flooring

7. Prepare and paint approximately 60 square feet of cement steps and risers

8. Prepare and Paint approximately 150 square feet of wood staircase steps, risers and landing

9. Prepare and Paint approximately 440 square feet of interior windows and trim.

10. Prepare and Paint approximately 1,999 square feet of interior wood doors.

11. Prepare and Paint approximately 556 linear feet of base trim.

12. Prepare and Paint approximately 249 square feet of wainscot.

13. Sand, stain and clear coat one set of stairs, risers and railings. (14 steps and 15 risers)

14. All work will be performed under a single contract.

ITEM 2 ‐ EXISTING UTILITIES

2.1 Water service:

A. Water service shall be maintained throughout construction.

ITEM 3 ‐ CONTRACTOR’S USE OF PREMISES

3.1 Conduct of Operations:

A. At all times the contractor shall conduct his operations in conformance with the rules and regulations promulgated by the Secretary of the Interior for the National Park Service, and applicable park rules and regulations prescribed by the Park Superintendent.

https://www.nps.gov/piro/learn/management/suptcompendium.htm

B. No signs or advertisements (except those specified herein) shall be displayed on the construction site or within the park unless approved by the Contracting Officer.

C. Smoking is not permitted within any Federal building or within 25 feet of entrances, operable windows, or outdoor air intakes.

D. Pubic Use of Site: Contractor shall at all times conduct operations to ensure the least inconvenience to the public. Access to the site is a 1.5‐mile road that is used by the public to access the site. Extra care will need to be taken to ensure for visitor safety when entering and leaving the site. Access for tours will remain open through outside entrance of the light house tower. Access to the building being repaired will remain closed to the public for duration of contract.

3.2 On‐site work hours:

A. Work shall be generally performed during normal business working hours of 8 a.m. to 4 p.m., Monday through Friday, except when otherwise indicated.

B. Work on Saturdays, Sundays, Federal holidays, early morning, or at night may not be performed without prior consent from the COR. Submit requests for work outside of the stated normal business hours to the COR for approval at least 48 hours in advance of the work.

3.3 Contractor Use of Site:

A. General: Contractor shall have limited use of the site for construction operations. Limit use of premises to (see picture below). Do not disturb portions of Project site beyond areas in which the Work is indicated.

B. Limits: All work will be limited to a 25‐foot perimeter around the proposed work site.

C. Driveways and Entrances: Keep driveways, access roads, and entrances serving premises clear and available to Government, Government's employees, and emergency vehicles at all times. Do not use these areas for parking or storage of materials. Schedule deliveries to minimize use of driveways and entrances.

D. Security and Protection facilities installation: Contractor will secure all tools and materials at all times.

E. Environmental Protection: Provide protection, operate temporary facilities, and conduct construction in ways and by methods that comply with environmental regulations and that minimize possible air, waterway, and subsoil contamination or pollution or other undesirable effects.

F. Cleaning of Equipment: The Contractor shall ensure that prior to moving on to the Project

Area, all equipment, is free of soil, seeds, vegetative matter, or other debris that could contain or hold seeds. Ensure that all equipment has been pressure washed and is free of exotic species prior to start‐up of operations and moving of equipment to Project Area.

Equipment shall be considered free of soil, seeds, and other debris when a visual inspection does not disclose such material. Disassembly of equipment components or specialized inspection tools are not required.

3.4 Storage ‐ Staging Areas:

A. Confine Storage of materials and equipment to the project area and on‐site 500 square foot storage garage.

3.5 Preservation of Natural Cultural Features:

A. Care to protect the historic sidewalks, exterior brick surfaces, landscape and trees will need to be taken to assure that no damage occurs. Contractor responsible for any damages and will make repairs at no additional cost to the government.

3.6 Hauling Restrictions:

A. Match State and County road requirements for all park work/access.

3.7 Housekeeping:

A. Keep project neat, orderly, and in a safe condition at all times. Store and use equipment, tools, and materials in a manner that does not present a hazard. Immediately remove all hazardous rubbish. Do not allow rubbish to accumulate. Provide onsite containers for collection of rubbish and dispose of it at frequent intervals during progress of work.

B. Dispose of waste materials legally using dumpsters provided by the contractor.

3.8 Occupancy Requirements for Buildings:

A. Existing Buildings:

Government will occupy light house tower that will be under construction during the entire contract period. Cooperate with Government during construction operations to minimize conflicts and facilitate Government usage. Perform the Work so as not to interfere with

Government's day‐to‐day operations. Maintain existing exits, unless otherwise indicated.

1. Maintain access to existing walkways, corridors, and other adjacent occupied or used facilities. Do not close or obstruct walkways, corridors, or other occupied or used facilities without written permission from the COR.

2. Maintain existing building in a weather tight condition throughout construction period.

3. Repair damage caused by construction operations. Protect building and its occupants during construction period.

3.9 Photo Documentation:

All photos shall be in focus, show maximum range of depth of field general photo and then close up detail photo as needed. Photos shall be submitted electronically to the COR.

A. Existing Condition Images: Before starting construction, take color, dated, digital images of project site and adjacent property/roads/etc. that may be impacted by construction activity/traffic. Include existing items to remain or be salvaged from different vantage points and with context for location identification.

B. Construction Images:

1. Document all project work, including tuckpointing, plaster repairs, floor repairs, staining, and painting to included interior and exterior repairs.

2. Maintain organized index for photos with date, description, etc.

3. Additional images as needed when questions or emergency situations occur. Submit within 24 hours.

3.10 Fire and Life Safety:

As a minimum, conduct one weekly 15‐minute "toolbox" safety meetings. These meetings shall be conducted by a foreman or supervisor and attended by all construction personnel at the worksite. Topics need to coincide with work scheduled for the following week. Document and submit meeting minutes to the COR within one day after the meeting.

A. Comply with the requirements of NFPA 241 (Standard for Safeguarding Construction, Alteration, and Demolition Operations).

B. Store and handle hazardous materials in accordance with manufacturer’s and OSHA 29CFR1926 Subpart D requirements. Maintain readily available, on site, MSDS/Safety Data Sheets (SDS) for each product.

1. Immediately report all spills of hazardous materials to the park.

2. Maintain a spill emergency response kit.

i. Train employees how to respond to a spill and use the emergency response kit.

ITEM 4 ‐ COMMENCEMENT, PROSECUTION, AND COMPLETION

4.1 Work Commencement:

The Contractor shall commence once the Notice to Proceed is issued.

The Period of Performance for this contract will be 120 days after the Notice to Proceed has been issued.

ITEM 5 ‐ EXAMINATION OF THE SITE

5.1 Job site inspection:

A. All prospective offerors are urged to attend the site visit and examine existing conditions before submitting bids.

ITEM 6 ‐ ABBREVIATIONS

6.1 Abbreviations:

A. The list of abbreviations, which may be used in the Construction Specifications or Special

Provisions, refer to the organizations and specifications of the organizations may be found at the below. https://www.nps.gov/orgs/1671/do‐business‐with‐us.htm

ITEM 7 ‐ ACCIDENT PREVENTION

7.1 Description:

A. The work of this section consists of establishing and implementing an effective accident prevention program and providing a safe environment for all personnel and visitors.

B. It is the Contractor's responsibility to require all those working on or visiting the site to wear hard hats and other necessary personal protective equipment in good repair at all times. As a minimum, maintain four hard hats and all other APP required equipment.

7.2 Submittal:

A. Accident Prevention Program: submit for approval an accident prevention program. The program shall include:

1. Name of responsible supervisor to carry out the program

2. First aid procedures

3. Training, both initial and continuing

4. Planning for possible emergency situations

5. Contractor to identify nearest location of medical facility for emergencies

6. Recognition that work will be performed in remote areas with limited communication or cell phone coverage

7.3 Qualification of Employees:

A. Ensure that employees are physically qualified to perform their assigned duties in a safe manner to include operators of vehicles and equipment. Provide operating instructions for all equipment.

B. Do not allow employees to work whose ability or alertness is impaired because of drugs, fatigue, illness, intoxication, or other conditions that may expose themselves or others to injury.

7.4 Accident Reporting:

A. The Contractor shall report all accidents to the COR or designee within 1 hour and assist the Contracting Officer and other officials as required in the investigation of the accident.

7.5 First Aid Facilities:

A. Provide adequate facilities for the number of employees and the type of construction at the site.

7.6 Emergency Instructions:

A. Post telephone numbers and reporting instructions for ambulance, physician, hospital, fire department, and police in conspicuous locations at the work site.

7.7 Hazardous Materials:

A. It shall be the responsibility of all operators and contractors, functioning within the park to properly cleanup, mitigate and remediate if necessary, all unauthorized discharges of hazardous materials or non‐hazardous chemical and biological products released from fleet and/or other support vehicles or stationary sources. Response shall be consistent with guidelines established by federal, state and local regulations, and as outlined within the operator's Safety or Hazardous Materials Business Plan.

ITEM 8 ‐ PRECONSTRUCTION CONFERENCE:

8.1 Pre‐Construction Conference

A. A pre‐construction conference between the awarded contractor, contracting office and COR will be held before the Notice to Proceed is issued. All items needed in order to schedule the pre‐construction conference and issue the Notice to Proceed are listed in Item # 9.1 General Submittal Procedures – D. #’s 1‐4

ITEM 9 ‐ SUBMITTALS

9.1 General Submittal Procedures:

A. General: Prepare and submit submittals required by individual Specification

Sections. Types of submittals are indicated in individual specific sections.

B. CM‐16 Transmittal Form: All submittals shall be transmitted via electronic email using National Park Service form CM‐16 form. The form will be provided by the

Contracting Officer. No action will be taken on a submittal item unless accompanied by the CM‐16 transmittal form. All CM‐16 transmittal forms will be submitted to the parks COR for review.

C. Submittal List: Submittals lists have been provided as attachments to the specifications. The intent is to provide an overall summary of submittal requirements and not a comprehensive list. The requirements of the individual

Specification Sections, terms and conditions of the Contract still apply regardless of what is shown on the submittal list.

D. Documents to be submitted to Contracting Office before NTP will be issued (all are due 10 days after notice of contract award – per block #12a of SF 1442 and this SOW):

1. Signed Contract

2. Alternative Payment Protection ‐ Must provide either a Payment

Bond or Irrevocable Letter of Credit for construction contracts greater than $35,000, but not greater than $150,000

• Payment Bonds ‐ Must be provided for construction contracts exceeding $150,000

• Performance Bond ‐ Must be provided for any construction contract exceeding $150,000

3. Certificate of Liability Insurance

4. Letter Designating the Project Manager and Site Superintendent and their authority as it pertains to this project

E. If all of the documents listed above have not been received, Notice to Proceed will not be issued, and the Contracting Officer will consider other contractual remedies. Work shall not commence until written Notice to Proceed has been issued.

F. Documents to be submitted to Contracting Office after NTP has been issued and work can be performed on‐site/begin (all are due 10 days after issuance of NTP

– per block #11 of SF 1442):

G. The following submittals shall be submitted with a CM_16 transmittal cover to the CO/COR and submitted for approval as outlined below:

1. Work/Project Schedule ‐‐ delineating the various stages of work by phase (milestones)

2. Contractor shall provide, when applicable but not limited to, copies of product specifications, manufacturer’s literature and installation instructions of all materials and products to be furnished and installed. COR will verify that product specifications meet contract requirements.

3. Safety/Accident Prevention Plan

4. Documentation of licensing or certification as an approved installer by manufacturer of materials to be used.

5. List of individuals working on the project

6. SF1413 – Statement of prime contractor/ acknowledgement of subcontractor

7. Safety Data Sheets (SDS) for all applicable materials (if applicable)

H. The following submittals are required to be submitted before final payment is made:

1. Contractor is required to provide at the end of the project a series of before, during and after pictures of what was completed. The pictures will include all areas the contractor is authorized to work

on. This document will be reviewed weekly to ensure compliance to the contract.

2. Manufacturers recommended care and cleaning requirements (if applicable)

3. Receipts from recycling companies showing quantity of material being recycled.

4. Warranty documentation for workmanship (as outlined in the SOW.

Start date of warranty will be the date shown on the Final

Inspection Checklist/Report)

5. Product warranties (if applicable)

6. Pay applications

7. Certified payrolls

8. Contractor quality control daily reports (any outstanding)

9. Release of claims ‐ must be for the full amount of the contract (to include modifications)

10. SF1413 (any outstanding) ‐ Statement of prime contractor/ acknowledgement of subcontractor

11. Drawings/pictures (if applicable), etc.

12. Final Inspection Checklist/Report (initiated by the COR, all parties sign once complete)

9.2 Product Data, and Samples:

A. COR will provide sample cover sheet CM‐16.

1. Product Data: Provide interior hard wood floor specifications.

2. Product Data: Provide mortar specifications.

3. Product Data: Provide plaster specifications.

4. Product Data: Provide interior wood floor and stair stain and finish specifications.

5. Provide Data: Provide interior paint specifications for all painted surfaces.

B. For submittals specified above, forward submittals to the Contracting

Officers Representative and he/she will forward them to the Contracting

Officer for approval. Please submit at least 15 days before need for approval.

C. After approving submittals, Contracting Officer will return one copy to the

Contractor. If submittals are not approved, Contracting Officer will return all copies to Contractor with reasons for rejection. Resubmit, identifying changes. Any work done before approval shall be at Contractor's own risk.

9.3 Approved Equals:

A. If an item in this solicitation is identified as “brand name or equal” or lists more than 3 manufacturers, the purchase description reflects the characteristics and level of quality that will satisfy the Government’s needs.

The salient physical, functional, or performance characteristics that “equal” products must meet are specified in the solicitation or relevant specification.

B. For each item proposed as an “approved equal,” submit supporting data, including:

1. Drawings and samples as appropriate.

2. Comparison of the characteristics of the proposed item with that specified.

3. Changes required in other elements of the work because of the substitution.

4. Name, address, and telephone number of vendors.

5. Manufacturer’s literature regarding installation, operation, and maintenance, including schematics for electrical and hydraulic systems, lubrication requirements, and parts lists. Describe availability of maintenance service, and state source of replacement materials.

C. A request for approval constitutes a representation that Contractor:

1. Has investigated the proposed item and determined that it is equal or superior in all respects to that specified.

2. Will provide the same warranties for the proposed item as for the item specified.

3. Has determined that the proposed item is compatible with interfacing items.

4. Will coordinate the installation of an approved item and make all changes required in other elements of the work because of the substitution.

5. Waives all claims for additional expenses that may be incurred as a result of the substitution.

D. Approved Equals will be evaluated and approved/disapproved during the submittal process.

9.4 Progress Schedules:

A. Within 10 days after the Notice to Proceed has been issued and before beginning any work, submit Progress Schedule. COR will review the Progress

Schedule for format and content. Submit one electronic copy of Progress

Schedule (normally in bar chart form) showing estimated starting and completion dates for each part of the work. The first progress payment will not be issued until an acceptable progress schedule is submitted. The following information must accompany submission of progress schedules prior to processing any pay application: Daily/weekly progress reports during construction as part of the administration process.

B. Schedule of Values: Breakdown each lump‐sum item into component work activities used in the schedule, for which progress payments may be requested. The Schedule of Values will form the basis for payment. The work activities broken out within the schedule of values shall be integrated into and made a logical part of the construction baseline schedule submitted under this specification. The total costs for the component work activities shall equal the contract price for that lump‐sum item. The

Contracting Officer may request data to verify accuracy of dollar values.

ITEM 10 – TEMPORARY SERVICES

10.1 Fire Prevention and Protection:

A. Hazard Control: Take all necessary precautions to prevent fire during construction. Provide adequate ventilation during use of volatile or noxious substances.

ITEM 11 ‐ PROJECT CLOSEOUT

11.1 Description:

A. The work of this section consists of final cleanup, closeout submittals, final inspection procedures, and safety precautions.

11.2 Cleaning:

A. Remove all tools, equipment, surplus materials, and rubbish. At time of final inspection, project shall be thoroughly clean and ready for use.

11.3 Final Completion and Final Inspection:

A. Submit written certification that project is complete, and a final inspection must be requested to the CO and COR in writing. The COR will make an inspection within 10 days of receipt of request or at a mutually agreeable time.

B. If the work is determined to be complete, following the final inspection, the

COR will prepare a Punch List and issue a Final Inspection Checklist.

C. If the work is not determined to be complete following the final inspection, the Contracting Officer will notify Contractor in writing. Contractor shall request a new final inspection after completing the work. Re‐inspection costs may be charged against the Contractor in accordance with the

Inspection of Construction contract clause.

D. Contractor shall complete the Punch List within 30 calendar days, documented.

E. If Contracting Officer determines that the work is not; he will immediately notify Contractor in writing, stating reasons. After completing work, Contractor shall resubmit certification and request a new final inspection.

Re‐inspection costs may be charged against the Contractor in accordance with the Inspection of Construction contract clause.

F. If Contractor completes all items of work on the Punch List and all contractually required items, Contracting Officer will issue Letter of final acceptance of work.

G. If the Contractor fails to complete the work within the time frame, the

Contracting Officer may correct the work with an appropriate reduction in contract price or charge for reinspection costs in accordance with the

Inspection of Construction contract clause.

H. Disposition of any permits and warranties required by the specifications in this section.

11.4 Acceptance of the Work:

A. After all deficiencies have been corrected, the Contracting Officer will sign the Final Inspection checklist. A Release of Claims document must be executed and submitted to the Contracting Officer before final payment can occur.

11.5 Warranties:

A. Construction Warranty shall be one year from the date of Final Acceptance.

B. Provide All Warranty information of products installed organized by

Division. All contact information, extents and conditions shall be clearly noted as well as date of overall project Final Completion.

C. Information shall include operation and maintenance manuals for each warranted material.

Section 040120.64 – Brick Masonry Repointing Section 040140.62 ‐ Stone Repointing

PART 1 ‐ GENERAL

1.1 SCOPE OF WORK.

Project Location:

Pictured Rocks National Lakeshore E18850 County Road H‐58

Grand Marais, MI 49839

Building(s) Name/Identifier:

Au Sable Coast Guard Station, Double Keepers Quarters HS‐11.

Work consists of the following:

1. Partial mortar repointing of brick masonry exterior walls for a two‐story building constructed in approximately 1909.

2. Mortar mixture to be based on petrographic mortar analysis and shall be performed in accordance with ASTM C1234 by a certified independent laboratory.

Contractor responsible for collecting existing mortar samples and conducting petrographic mortar analysis. Contractor to coordinate with COR to identify existing mortar to be removed for mortar analysis. Contractor to provide test analysis results and replacement mortar formulation recommendations.

1.2 SUMMARY

A. Section includes repointing joints with mortar.

1.3 PREINSTALLATION MEETINGS

A. Pre‐installation Conference: Conduct conference at Project site.

1.4 ACTION SUBMITTALS

A. Product Data: For each type of product.

B. Samples: For each exposed product and for each color and texture specified.

C. Approved Mortar Mix Proportion Specification.

1.5 INFORMATIONAL SUBMITTALS

A. Quality‐control program.

B. Petrographic mortar analysis report and mortar formulation recommendation.

1.6 QUALITY ASSURANCE

A. Quality‐Control Program: Prepare a written quality‐control program for this

Project to systematically demonstrate the ability of personnel to properly follow methods and use materials and tools without damaging masonry.

Include provisions for supervising performance and preventing damage.

B. Temperature: Maintain wall temperature between 40 and 95 degrees F. To the extent possible, repoint in the shade, away from strong sunlight in order to slow the drying process.

C. Mockups: Prepare mockups of brick masonry repointing to demonstrate aesthetic effects and to set quality standards for materials and execution.

D. Repointing: Rake out joints in one area, approximately 12 inches (300 mm) high by 24 inches (600 mm) wide, unless otherwise indicated, for each type of repointing required, and repoint one of the areas.

1. Remove mortar with hand tools (chisel and hammer) in combination with assistance of power tools as follows:

2. Use of hand‐held small pneumatic impact chisels and narrow rotary‐ grinder drills is allowed if done without damaging the existing brick masonry units.

3. Use of angle grinder with a diamond‐impregnated metal blade, for aligned horizontal joints only, is allowed if done without damaging the existing brick masonry units. Blades shall be half as narrow as the joint, cut made in the center of the joint, and final removal from the sides of the joint by hand.

PART 2 ‐ PRODUCTS

2.1 MORTAR MATERIALS

A. Natural Cement: Natural cement processed from argillaceous limestone and meeting the requirements of ASTM C10. https://www.astm.org/Standards/E1441.htm Artificial mixtures of other cementitious materials, fly ash, slag, Portland cement, hydraulic lime or lime‐pozzolan mixtures are not permitted as substitutes for natural cement

• Hydrated Lime: ASTM C207 Type S Mortar Sand: ASTM 144

B. Match size, texture, and gradation of existing mortar sand as closely as possible. Blend several sands if necessary, to achieve suitable match.

C. Color: Provide natural sand or ground marble, granite, or other sound stone of color necessary to produce required mortar color.

D. Mortar Pigments: ASTM C979/C979M, compounded for use in mortar mixes, and having a record of satisfactory performance in masonry mortars.

E. Use only synthetic mineral oxides, alkali‐proof and sun‐fast. Organic pigments are not allowable.

F. Match to existing mortar color based on mortar analysis.

Water: Potable

2.2 MORTAR MIXES

A. Measurement and Mixing: Measure cementitious materials and sand in a dry condition by volume or equivalent weight. Do not measure by shovel; use known measure. Mix materials in a clean, mechanical batch mixer.

B. Mixing Pointing Mortar: Thoroughly mix cementitious materials and sand together before adding any water. Then mix again, adding only enough water to produce a damp, unworkable mix that retains its form when pressed into a ball. Maintain mortar in this dampened condition for 15 to 30 minutes. Add remaining water in small portions until mortar reaches desired consistency. Use mortar within one hour of final mixing; do not re‐ temper or use partially hardened material.

C. Colored Mortar: Produce mortar of color required by using specified ingredients. Do not alter specified proportions without Contracting Officer’s Representative (COR) approval.

D. Mortar Pigments: Where mortar pigments are indicated, do not add pigment exceeding 10 percent by weight of the cementitious or binder materials, except for carbon black which is limited to 2 percent. Do not use admixtures in mortar unless otherwise indicated.

E. Mixes: Mix mortar materials in the following proportions:

• Mortar shall conform to the proportion requirements as required to match the original mortar, as determined by petrographic analysis.

F. Petrographic analysis shall be performed in accordance with ASTM C1324 by a certified independent laboratory experienced in the identification of natural cements.

PART 3 ‐ EXECUTION

3.1

PROTECTION

A. Remove gutters and downspouts and associated hardware adjacent to masonry and store during masonry repointing. Reinstall when repointing is complete.

B. Provide temporary rain drainage during work to direct water away from building.

REPOINTING

A. Rake out and repoint joints to the following extent:

1. All joints in areas indicated: Contractor to coordinate with COR to determine repointing locations.

B. Rake out joints as follows, according to procedures demonstrated in approved mockup:

1. Remove mortar from joints to depth of joint width plus 1/8 inch (3 mm) and not less than that required to expose sound, un‐weathered mortar. Do not remove unsound mortar more than 2 inches (50 mm) deep; consult COR for direction.

2. Remove mortar from brick and other masonry surfaces within raked‐out joints to provide reveals with square backs and to expose masonry for contact with pointing mortar. Brush, vacuum, or flush joints with clean, low‐pressure water spray to remove dirt and loose debris.

3. Do not spall edges of brick or other masonry units or widen joints. Replace or patch damaged brick or other masonry units as directed by COR.

4. Notify COR of unforeseen detrimental conditions including voids in mortar joints, cracks, loose masonry units, rotted wood, rusted metal, and other deteriorated items.

C. Pointing with Mortar:

1. Rinse joint surfaces with water to remove dust and mortar particles. Time rinsing application so, at time of pointing, joint surfaces are damp but free of standing water.

If rinse water dries, dampen joint surfaces before pointing.

2. Apply pointing mortar first to areas where existing mortar was removed to depths greater than surrounding areas. Apply in layers not greater than 3/8 inch (9 mm) until a uniform depth is formed. Fully compact each layer and allow it to become thumbprint hard before applying next layer.

3. After deep areas have been filled to same depth as remaining joints, point joints by placing mortar in layers not greater than 3/8 inch (9 mm). Fully compact each layer and allow to become thumbprint hard before applying next layer. Where existing masonry units have worn or rounded edges, slightly recess finished mortar surface below face of masonry to avoid widened joint faces. Take care not to spread mortar beyond joint edges onto exposed masonry surfaces or to featheredge the mortar.

4. When mortar is thumbprint hard, tool joints to match original appearance of joints as demonstrated in approved mockup. Remove excess mortar from edge of joint by brushing.

5. Cure mortar by maintaining in thoroughly damp condition for at least 72 consecutive hours. Coordinate mortar curing accordingly to avoid weekend and holiday work, unless approved by COR.

6. Hairline cracking within mortar or mortar separation at edge of a joint is unacceptable.

Completely remove such mortar and repoint.

7. Where repointing work precedes cleaning of existing masonry, allow mortar to harden at least 30 days before beginning cleaning work.

3.2 FINAL CLEANING OF REPOINTED MASONRY

1. If repointing work is carefully executed, there will be little need for cleaning other than to remove the small amount of mortar from the edge of the joint following tooling.

2. Remove excess repointing mortar from joint edge with a stiff natural bristle or nylon brush after the mortar has dried, but before it is initially set. Do not employ aggressive cleaning methods that could damage masonry surfaces or the mortar.

END OF SECTION

Division 04‐ Brick Masonry‐Section 040120.64 – Brick Masonry Repointing Section 040140.62 ‐ Stone

Repointing

PART 1 ‐ GENERAL

1.1 SCOPE OF WORK.

Project Location:

Pictured Rocks National Lakeshore

E18850 County Road H‐58

Grand Marais, MI 49839

Building(s) Name/Identifier:

Au Sable Coast Guard Station

Double Keepers Quarters HS‐11

Work consists of the following:

A. Full mortar repointing of stone exterior foundation walls consisting of approximately

880 lineal feet of mortar joints on building constructed in approximately 1909.

Approved mortar mix being used on the brick face repointing as determined by brick mortar analysis shall be used on the stone foundation repointing.

1.2 SUMMARY

A. Section includes repointing joints with mortar.

1.3 PREINSTALLATION MEETINGS

A. Preinstallation Conference: Conduct conference at Project site.

1.4 ACTION SUBMITTALS

A. Product Data: For each type of product.

B. Samples: For each exposed product and for each color and texture specified.

C. Approved Mortar Mix Proportion Specification based on mortar analysis.

1.5 INFORMATIONAL SUBMITTALS

A. Quality‐control program.

B. Petrographic mortar analysis report and mortar formulation recommendation.

1.6 QUALITY ASSURANCE

A. Quality‐Control Program: Prepare a written quality‐control program for this Project to systematically demonstrate the ability of personnel to properly follow methods and use materials and tools without damaging stonework. Include provisions for supervising performance and preventing damage.

B. Temperature: Maintain wall temperature between 40‐ and 95‐degrees F. To the extent possible, repoint in the shade, away from strong sunlight in order to slow the drying process.

C. Mockups: Prepare mockups of stone repointing to demonstrate aesthetic effects and to set quality standards for materials and execution.

1. Repointing: Rake out joints in one area approximately 12 inches (300mm) high by 24 inches (600 mm) wide unless otherwise indicated for each type of repointing required and repoint one of the areas.

2. Remove mortar with hand tools (chisel and hammer) in combination with assistance of power tools as follows:

a. Use of hand‐held small pneumatic impact chisels and narrow rotary‐ grinder drills is allowed if done without damaging the existing stone units.

b. Use of angle grinder with a diamond‐impregnated metal blade, for aligned horizontal joints only, is allowed if done without damaging the existing stone units. Blades shall be half as narrow as the joint, cut made in the center of the joint, and final removal from the sides of the joint by hand.

2.1 MORTAR MATERIALS

A. Natural Cement: Natural cement processed from argillaceous limestone and meeting the requirements of ASTM C10. Artificial mixtures of other cementitious materials, fly ash, slag, Portland cement, hydraulic lime or lime‐pozzolan mixtures are not permitted as substitutes for natural cement.

Hydrated Lime: ASTM C207 Type S Mortar Sand: ASTM C144

1. Match size, texture, and gradation of existing mortar sand as closely as possible. Blend several sands if necessary, to achieve suitable match.

2. Color: Provide natural sand or ground marble, granite, or other sound stone of color necessary to produce required mortar color based on mortar analysis.

B. Mortar Pigments: ASTM C979/C979M, compounded for use in mortar mixes, and having a record of satisfactory performance in masonry mortars.

1. Use only synthetic mineral oxides, alkali‐proof and sun‐fast. Organic pigments are not allowable.

2. Match mortar color to existing color based on mortar analysis.

i. Water: Potable

2.2 MORTAR MIXES

A. Measurement and Mixing: Measure cementitious materials and sand in a dry condition by volume or equivalent weight. Do not measure by shovel; use known measure. Mix materials in a clean, mechanical batch mixer.

1. Mixing Pointing Mortar: Thoroughly mix cementitious materials and sand together before adding any water. Then mix again, adding only enough water to produce a damp, unworkable mix that retains its form when pressed into a ball. Maintain mortar in this dampened condition for 15 to 30 minutes. Add remaining water in small portions until mortar reaches desired consistency.

Use mortar within one hour of final mixing; do not retemper or use partially hardened material.

B. Colored Mortar: Produce mortar of color required by using specified ingredients. Do not alter specified proportions without Contracting Officer’s Representative (COR) approval.

1. Mortar Pigments: Where mortar pigments are indicated, do not add pigment exceeding 10 percent by weight of the cementitious or binder materials, except for carbon black which is limited to 2 percent.

C. Do not use admixtures in mortar unless otherwise indicated.

D. Mixes: Mix mortar materials in the following proportions:

1. Mortar shall conform to the proportion requirements as required to match the original mortar, as determined by petrographic analysis.

2. Petrographic analysis shall be performed in accordance with ASTM C1324 by a certified independent laboratory experienced in the identification of natural cements.

PART 3 ‐ EXECUTION

3.1 PROTECTION

A. Remove gutters and downspouts and associated hardware adjacent to masonry and store during masonry repointing. Reinstall when repointing is complete.

B. Provide temporary rain drainage during work to direct water away from building.

3.2 REPOINTING

A. Rake out and repoint joints to the following extent:

B. All joints in areas indicated: Stone foundation requires a full repoint. Contractor to coordinate mockup location with COR for approval before proceeding with the foundation work.

C. Rake out joints as follows, according to procedures demonstrated in approved mockup.

D. Remove mortar from joints to depth of joint width plus 1/8 inch (3 mm) and not less than that required to expose sound, un‐weathered mortar. Do not remove unsound mortar more than 2 inches (50 mm) deep; consult COR for direction.

E. Remove mortar from brick and other masonry surfaces within raked‐out joints to provide reveals with square backs and to expose masonry for contact with pointing mortar. Brush, vacuum, or flush joints with clean, low‐pressure water spray to remove dirt and loose debris.

F. Do not spall edges of brick or other masonry units or widen joints. Replace or patch damaged brick or other masonry units as directed by COR.

G. Notify COR of unforeseen detrimental conditions including voids in mortar joints, cracks, loose masonry units, rotted wood, rusted metal, and other deteriorated items.

H. Pointing with Mortar:

1. Rinse joint surfaces with water to remove dust and mortar particles. Time rinsing application so, at time of pointing, joint surfaces are damp but free of standing water. If rinse water dries, dampen joint surfaces before pointing.

2. Apply pointing mortar first to areas where existing mortar was removed to depths greater than surrounding areas. Apply in layers not greater than 3/8 inch (9 mm) until a uniform depth is formed. Fully compact each layer and allow it to become thumbprint hard before applying next layer.

3. After deep areas have been filled to same depth as remaining joints, point joints by placing mortar in layers not greater than 3/8 inch (9 mm). Fully compact each layer and allow to become thumbprint hard before applying next layer. Where existing masonry units have worn or rounded edges, slightly recess finished mortar surface below face of masonry to avoid widened joint faces. Take care not to spread mortar beyond joint edges onto exposed masonry surfaces or to featheredge the mortar.

4. When mortar is thumbprint hard, tool joints to match original appearance of joints as demonstrated in approved mockup. Remove excess mortar from edge of joint by brushing.

5. Cure mortar by maintaining in thoroughly damp condition for at least 72 consecutive hours. Coordinate mortar curing accordingly to avoid weekend and holiday work, unless approved by COR.

6. Hairline cracking within mortar or mortar separation at edge of a joint is unacceptable. Completely remove such mortar and repoint.

7. Where repointing work precedes cleaning of existing stone, allow mortar to harden at least 30 days before beginning cleaning work.

3.3 FINAL CLEANING OF REPOINTED MASONRY

A. If repointing work is carefully executed, there will be little need for cleaning other than to remove the small amount of mortar from the edge of the joint following tooling.

B. Remove excess repointing mortar from joint edge with a stiff natural bristle or nylon brush after the mortar has dried, but before it is initially set. Do not employ aggressive cleaning methods that could damage masonry surfaces or the mortar.

Division 09‐Finishes‐Section 09280 ‐ Plaster Restoration

PLASTER RESTORATION

PART1 GENERAL

1.01 SECTION INCLUDES

A. Repair of existing plaster system and blending to match existing adjacent finish at the following locations:

i. All existing cracks and holes in ceilings and walls.

ii. Water damaged and delaminated plaster.

iii. Areas damaged by reconstruction work.

B. Furring and lath.

C. Smooth surface finish.

1.02 RELATED SECTIONS

A. Section 099123 ‐ Interior Painting

1.03 REFERENCES

A. Preservation Briefs #21 ‐ Repairing Historic Flat Plaster by Marylee MacDonald ‐ 14 pages

‐ U.S. Department of the Interior ‐ National Park Services ‐ Preservation Assistance

Division ‐ Technical Preservation Services https://www.nps.gov/tps/how‐to‐ preserve/briefs/21‐flat‐plaster.htm plaster.htm

B. ANSI/ASTM C28 ‐ Gypsum Plaster.

C. ANSI/ASTM C35 ‐ Inorganic Aggregates for use in Gypsum Plaster.

D. ANSI/ASTM C61 ‐ Gypsum Keene's Cement.

E. ANSI/ASTM C631 ‐ Bonding Compounds for Interior Plastering.

F. ANSI/ASTM C842 ‐ Application of Interior Gypsum Plaster.

1.04 SUBMITTALS

A. Provide product data on plaster materials, characteristics and limitations of products specified.

B. Submit proposed plaster mix indicating proportional quantities of each material used.

C. Submit manufacturer's installation instructions.

1.05 FIELD SAMPLES

A. Construct field sample panel, 4 x 4 feet illustrating patching and surface finish.

B. Locate sample where directed by Contracting Officer's Representative (COR).

C. Accepted sample shall remain as part of the work.

1.06 ENVIRONMENTAL REQUIREMENTS

A. Do not apply plaster when substrate or ambient air temperature is less than 50 degrees F nor more than 80 degrees F.

B. Maintain minimum ambient temperature of 50 degrees F during and after installation of plaster.

C. Ventilate spaces as required to avoid moisture damage to historic woodwork.

D. Protect all adjacent surfaces to avoid damage to historic wood finish and materials to remain.

PART 2 PRODUCTS

2.01 ACCEPTABLE MANUFACTURERS

A. U.S. Gypsum.

B. Gold Bond.

C. National Gypsum.

D. Or approved equal.

2.02 PLASTER BASE MATERIALS

A. Match existing plaster in materials, appearance and workmanship. Plaster: ANSI/ASTM

C28; Gypsum mill aggregated type.

C. Aggregate: ANSI/ASTM C35; sand type to match existing.

D. Water: Clean, fresh, potable and free of mineral or organic matter which can affect plaster.

E. Bonding Agent: ANSI/ASTM C631; Acrylic 60 or equal mixed in accordance with manufacturer's directions.

2.03 FINISHING PLASTER

A. Keene's Cement/Lime Putty Type: ANSI/ASTM C61 and C206; mixture of Keene's cement and lime or approved equal.

B. Water: Clean, fresh, potable and free of mineral and organic matter which can affect plaster.

2.04 LATH

A. Metal Lath: Flat or self‐furring diamond mesh, minimum 26 gauge thick, expanded metal with patches.

B. Wood lath: Wood lath to match existing and expanded metal lath panels.

2.05 ACCESSORIES

A. Comer Beads: Formed steel, minimum 26 gauge thick; beaded edge, of longest possible length, sized and profiled to suit application; galvanized finish.

B. Base Screeds: Formed steel, minimum 26 gauge thick; square edge, of longest possible length; sized and profiled to suit application; galvanized finish.

C. Casing Bead: Formed steel, minimum 26 gauge thick; thickness governed by plaster thickness; maximum possible lengths; expanded metal flanges, with square edges;

galvanized finish.

D. Control and Expansion Joint Accessories: Formed steel; minimum 25 gauge thick;

accordion profile, 2‐inch expanded metal flanges each side; galvanized finish.

E. Anchorages: Nails, staples, or other approved metal supports, of type and size to suit application, galvanized, to rigidly secure lath and associated metal accessories in place.

2.06 PLASTER MIX

A. Mix and proportion plaster in accordance with manufacturer's instructions, and to match existing.

PART 3 EXECUTION

3.01 EXAMINATION

A. Identify location of all deteriorated plaster, cracks, chips, alligatoring, and spalling of plaster within Contract area.

B. Verify that surfaces and site conditions are ready to receive work.

C. Lath and Accessories: Verify lath is flat. secured to substrate, and joint and surface perimeter accessories are in place.

D. Beginning of installation means acceptance of existing conditions.

3.02 PREPARATION

A. Protect elements surrounding the work of this Section from damage or disfiguration.

B. Dampen masonry surfaces and wood lath to reduce excessive suction.

C. Remove all existing damaged and unsound plaster to sound substrate. Remove all unsound lathing to solid framing or masonry.

D. Clean existing plaster surfaces of foreign matter. Thoroughly dampen surfaces before using solutions, solvent, or detergents to perform cleaning. Wash surface with clean water.

E. Roughen smooth existing plaster surfaces and slightly widen small cracks to be repaired.

F. Apply bonding agent in accordance with manufacturer's instructions to areas of delaminated finish coat.

3.03 INSTALLATION ‐ LATH MATERIALS

A. Apply metal lath securely fixed to framing members or walls.

B. Apply wood lath secure, with long dimension perpendicular to supports to match existing.

3.04 INSTALLATION ACCESSORIES

A. Continuously reinforce internal angles with corner mesh, except where the metal lath returns 3 inches from corner to form the angle reinforcement; fasten at perimeter edges only.

B. Place beaded external angle with mesh as corners; fasten at outer edges only.

C. Place strip mesh diagonally at corners of lathed openings. Secure rigidly in place.

D. Place 4‐inch‐wide strips of metal lath centered over junctions of dissimilar backing materials. Secure rigidly in place.

E. Place casing beads at terminations of plaster finish. Butt and align ends. Secure rigidly in place.

3.05 PLASTERING

A. All plaster work must be done neatly and precisely by craftsmen skilled in repair work.

B. Apply gypsum plaster in accordance with manufacturer's instructions.

C. Repair and patch existing plaster. Repairs and patch include:

D. Patch and fill hair line cracks with joint compound. For larger cracks (1/16" ‐ 1/8"), enlarge slightly with sharp pointed tool. Fill cracks with joint compound. Larger cracks may need to be bridged with fiberglass mesh drywall tape and coated with joint compound. Feather edges and apply successive coats of compound and lightly sand or texture to match existing surface. Patch larger cracks or cracks due to structural movement by removing unsound plaster to lath or masonry to a width of ±6". Clean away debris and apply metal lath over substrate. Patch area with 3 coat plaster system.

E. For areas of delaminated finish coat, apply bonding agent to base coat. Replaster area with new finish coat.

1. Patch small holes (less than 3" involving loss of brown coat and finish coat) in two step applications. Apply base coat and scrape below cover of finish coat.

i.Allow base coat to set and apply finish coat.

ii. Patch large holes (involving loss of all coats of plaster) using three coat system. Apply lath to solid substrate. Cut to fit the hole. Apply plaster in three coats to produce a strong, invisible patch.

F. Patch areas cut or…