Attachment 3 Revised Spec Section 04 01 40.91 Section 1.2B_ Amendment #4.pdf

ANC Columbarium Court 7, 8, & 9 1007COLUMBARIUM

RTA SUBMITTAL

PROJECT TABLE OF CONTENTS

DI VI SI ON 01 - GENERAL REQUI REMENTS

01 11 00.00 51 SUMMARY OF WORK

01 30 00.10 51 PROJECT WORK REQUIREMENTS AND RESTRICTIONS

01 32 01.00 10 PROJECT SCHEDULE

01 32 33 PHOTOGRAPHIC DOCUMENTATION

01 33 00 SUBMITTAL PROCEDURES

01 35 10.00 51 SPECIAL PROCEDURES FOR HISTORIC TREATMENT

01 35 26 GOVERNMENTAL SAFETY REQUIREMENTS

01 35 91 DISMANTLING, REMOVAL, AND STORAGE

01 42 00 SOURCES FOR REFERENCE PUBLICATIONS

01 45 00.00 10 QUALITY CONTROL

01 45 00.15 10 RESIDENT MANAGEMENT SYSTEM CONTRACTOR MODE(RMS CM)

01 48 00 SCAFFOLDING AND PROTECTION SYSTEMS

01 50 00.00 51 TEMPORARY CONSTRUCTION FACILITIES AND CONTROLS

01 57 19.12 NOISE & ACOUSTICS MANAGEMENT

01 57 20.00 51 ENVIRONMENTAL PROTECTION

01 57 23 TEMPORARY STORM WATER POLLUTION CONTROL

01 58 00.00 50 PROJECT IDENTIFICATION

01 62 35.00 50 RECYCLED / RECOVERED MATERIALS

01 74 19.00 50 CONSTRUCTION AND DEMOLITION WASTE MANAGEMENT

01 78 00 CLOSEOUT SUBMITTALS

01 78 23 OPERATION AND MAINTENANCE DATA

DI VI SI ON 03 - CONCRETE

03 01 00 REHABILITATION OF CONCRETE

03 01 31 CONCRETE REMOVAL AND SURFACE PREPARATION

03 01 34 CONCRETE PATCHING

DI VI SI ON 04 - MASONRY

04 01 20.52 STONE MASONRY AND CONCRETE CLEANING

04 01 27 REPOINTING

04 01 40.91 STONE RESTORATION

04 05 01 MASONRY MORTAR AND GROUT

04 40 00 STONEWORK

DI VI SI ON 07 - THERMAL AND MOI STURE PROTECTI ON

07 53 23 ETHYLENE-PROPYLENE-DIENE-MONOMER ROOFING

07 60 00 FLASHING AND SHEET METAL

07 92 00 JOINT SEALANTS

DI VI SI ON 09 - FI NI SHES

09 96 53 ELASTOMERIC COATINGS

09 97 13 COATINGS FOR FERROUS METALS

DI VI SI ON 22 - PLUMBI NG

22 00 00 PLUMBING, GENERAL PURPOSE

DI VI SI ON 26 - ELECTRI CAL

26 05 00.00 40 COMMON WORK RESULTS FOR ELECTRICAL

PROJECT TABLE OF CONTENTS Page 1

DI VI SI ON 32 - EXTERI OR I MPROVEMENTS

32 05 33.00 51 ANC - LANDSCAPE ESTABLISHMENT

32 92 23.00 51 SODDING

-- End of Project Table of Contents --

PROJECT TABLE OF CONTENTS Page 2

SECTION 04 01 40.91

STONE RESTORATION

08/16

PART 1 GENERAL

1.1 SUMMARY

A. Section includes restoration of limestone and granite as follows:

1. Preparation and installation mock-ups of all specified stone repair types.

2. Preparation and installation mock-ups of all specified stone repair type.

B. Products Installed but not Supplied under this Section:

1. Section 04 05 01 Masonry Mortar and Grout

2. Section 07 92 00 Joint Sealants

C. Related Sections:

1. Section 04 01 20.52 Masonry Cleaning

2. Section 04 01 27 Repointing

3. Section 04 50 01 Masonry Mortar and Grout

4. Section 07 92 00 Joint Sealants

1.2 SCOPE

A. Perform stone restoration at the locations designated on the Drawings as part of lump sum scope.

B. Not used.

1.3 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.

ASTM INTERNATIONAL (ASTM)

ASTM A193/A193M (2016) Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for High-Temperature Service and Other Special Purpose Applications

ASTM A276/A276M (2016a) Standard Specification for Stainless Steel Bars and Shapes

ASTM C97/C97M (2015) Absorption and Bulk Specific

SECTION 04 01 40.91 Page 1

E4ECEMCJ

Polygon Amendment #4. Change paragraph 1.2-B to "Not used."

Gravity of Dimension Stone

ASTM C99/C99M Standard Test Method for Modulus of Rupture of Dimension Stone

ASTM C170/C170M (2016) Standard Test Method for Compressive Strength of Dimension Stone

ASTM C568/C568M Standard Specification for Limestone Dimension Stone.

ASTM C615/C615M (2011) Standard Specification for Granite Dimension Stone.

ASTM C88 (2018) Standard Test Method for Soundness of Aggregates by Use of Sodium Sulfate or Magnesium Sulfate

ASTM C97/C97M (2015) Absorption and Bulk Specific Gravity of Dimension Stone

ASTM D1729 Standard Practice for Visual Appraisal of Colors and Color Differences of Diffusely-Illuminated Opaque Materials

ASTM E165/E165M (2012) Standard Practice for Liquid Penetrant Examination for General Industry

ASTM F593 (2017) Standard Specification for Stainless Steel Bolts, Hex Cap Screws, and Studs

Indiana Limestone Institute of America, Inc.

ILI Handbook (17th ed) Building Stones

1.4 DEFINITIONS

A. Cut stone: Stone fabricated to specific dimensions.

B. Dimension stone: Natural stone that has been selected and fabricated to specific sizes or shapes.

C. Dressed stone: See cut stone and finished stone.

D. Dutchman: Piece of stone used to repair larger stone panel.

E. Exfoliation: Fracture of stone to form thin sheet parallel to surface.

F. Finished stone: Dimension stone with one or more mechanically exposed surfaces.

G. Seam: Naturally filled or bonded feature in stone, such as streak or vein, which may or may not adversely affect strength of stone.

H. Open seam: Unfilled fissure or naturally occurring crack in stone.

I. Snip: Area of stone surface from which chip, or irregularly-shaped fragment, has been dislodged.

SECTION 04 01 40.91 Page 2

J. Spall: Fragment or chip from piece of dimension stone.

K. Veining: Presence in otherwise homogeneous stone of bands, streaks, or irregular bodies of contrasting color or appearance, and frequently having different mineralogical composition to predominant material.

"Veining" does not apply to gneiss, commercial granite types, and slate. .

1.5 SUBMITTALS

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

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government.

SD-01 Preconstruction Submittals

Contractor Qualifications; G Stone Fabricator; G

SD-02 Shop Drawings

Dutchmen Repairs; G Anchors; G Hardware Assemblies; G Replacement Stone Panels; G

SD-03 Product Data

New Stone: Limestone; G New Stone: Granite; G Repair Material; G Auxiliary Materials; G Field Quality Control; G

SD-04 Samples

Replacement Stone; G Repair Mortar; G Three Samples Of Each Product; G

SD-06 Test Reports

Test Reports; G

SD-07 Certificates

Certificates; G Repair Program; G

1.6 SUBMITTAL LIST

A. Product Data: Manufacturer's literature including material properties;

test data substantiating that products comply with requirements;

recommendations for storage and handling; installation procedures; and recommendations for field testing. Include VOC content of components.

1. New Stone: Product data including test results no more than two

SECTION 04 01 40.91 Page 3 years old and certification that stone to be supplied has specified minimum properties.

2. Include Globally Harmonized System (GHS) or, if not yet available, Material Safety Data Sheets for information only.

B. Shop Drawings:

1. Replacement Stone Panels: Complete cutting and setting drawings showing:

a. Sizes, sections, and dimensions of stone.

b. Joint locations.

c. Anchoring details.

d. Other necessary details.

2. Dutchmen Repairs: Typical dimensions and anchoring details.

3. Anchors: Include details of anchors within individual stone panels, with locations of anchors and dimensions, directions, and angles of holes and recesses in stone.

4. Hardware Assemblies: Include details of assemblies.

C. Samples:

1. Replacement Stone: Sets of at least three 12 inch by 12 inch samples for each type of stone, finished to match cleaned existing stone panels and demonstrating range of variations in stone appearance. Approved samples are for comparison of texture, finish, and color of new stone supplied for Project.

a. Clean representative existing panels in accordance with Section 04 01 20.52.

b. COR will determine acceptability of color of replacement stone.

c. Resubmit samples until approved by COR.

2. Repair Mortar: One briquette at least 3 inches long by 1 1/2 inches wide, for each type of repair mortar and each stone type. Include manufacturer and stock number or other information necessary to order additional material for each sample. Samples will be compared with cleaned existing stone units.

a. Clean representative existing panels in accordance with Section 04 01 20.52.

b. COR will determine acceptability of color of replacement stone.

3. Three samples of each product:

a. Hardware with nuts, bolts, and washers

b. Compressible filler materials

SECTION 04 01 40.91 Page 4

c. Anchors

d. Shims

e. Epoxy

D. Certificates:

1. For workers that will be installing anchors.

E. Test Reports:

1. For stainless steel elements; signed by steel manufacturer certifying compliance with requirements; include physical properties and chemical analysis.

2. For anchors.

F. Field Quality Control: Log table for each stone repair type with date and location of each repair and batch number of repair material used.

Provide COR with updated table every two weeks maximum.

G. Repair Program: For each phase of repair process, provide detailed description of materials, methods, equipment, and sequence of operations to be used, including protection of surrounding materials on building and Site.

1. If materials and methods other than those indicated are proposed, provide written description, including evidence of successful use on comparable projects and testing program to demonstrate their effectiveness for Project.

2. Contractor and Stone Fabricator: Submit comprehensive quality-control program indicating means and methods and related quality control procedures during quarrying, fabrication, shipping, and installation.

H. Qualifications:

1. Contractor Qualifications: Evidence that Contractor's existing company has minimum five years of continuous experience in similar stone restoration work; list of at least five representative, successfully-completed projects of similar scope and size, including:

a. Project name

b. Owner's name

c. Owner's Representative name, address, and telephone number

d. Description of stone restoration work

e. Project supervisor

f. Total cost of stone restoration work and total cost of project

g. Completion date

SECTION 04 01 40.91 Page 5

2. Stone Fabricator: Evidence that Fabricator's existing company has minimum five years of continuous experience in similar stone fabrication work; list of at least five representative, successfully-completed projects of similar scope and size, including:

a. Project name

b. Owner's name

c. COR name, address, and telephone number

d. Description of stone fabrication work

e. Project supervisor

f. Total cost of stone fabrication work and total cost of project

g. Completion date

1.7 QUALITY ASSURANCE

A. Qualifications:

1. Contractor: Experienced firm that has successful completed stone restoration work similar in material, design, and extent to that indicated for the Project. Must have successful construction with specified materials in local area in use for minimum of five years.

a. Foreman: Minimum five years of experience as foreman on similar projects, who is fluent in English, to be on Site at all times during the Work. Do not change foremen during the course of the Project except for reasons beyond the control of Contractor;

inform COR in advance of any changes.

b. Stone masons: Minimum five years of experience as stone mason on similar projects.

2. Stone Fabricator: Minimum of five years of experience in fabrication of stone similar to that indicated for Project.

B. Certifications:

1. Written certification from adhesive anchor manufacturer that each laborer who will be installing anchors has successfully completed training program and is qualified to install anchors; include results of anchor pull-out tests.

C. Mock-ups: Mock-up installation to be selected by COR. Mock-ups to include each repair type and stone. Mock-ups to demonstrate quality of surface preparation, repair installation, and execution, and completed repair appearance. Prior to selection of repair mortar color, the sample area shall be cleaned in accordance with Section 04 01 20.52 Masonry Cleaning.

1. Mock-ups shall include:

a. Replace Damaged Stone Unit: One limestone unit.

SECTION 04 01 40.91 Page 6

b. Pin-in-place Stone Unit: One limestone unit. Engage manufacturer to test helical anchors to specified pullout capacity.

c. Reattach Stone Fragment: One limestone fragment.

d. Stone Dutchman Repair: One limestone and one granite dutchman repair. The COR to inspect removal cavity prior to dutchman installation.

e. Stone Dutchman Repair at Fountain Courtyard: One limestone dutchman repair. COR to inspect removal cavity prior to dutchman installation.

f. Cementitious Patch Repair: One limestone cementitious patch repair.

g. Stain Existing Cementitious Patch Repairs: One cementitious patch repair per Court.

h. Epoxy Inject Crack Repair: One limestone and one granite crack repair.

i. Epoxy Inject and Point Crack Repair: One limestone and one granite crack repair.

j. Abandoned Anchors, Wires, and Hooks: One perimeter wall and one linear stack location per Court.

2. Construct mockups on existing walls, at locations designated by COR and in presence of COR, under same weather conditions expected during Work. Provide access to mockup locations.

3. Demonstrate specified materials and methods, using tools and equipment intended for use by workmen who will perform Work.

4. Photograph concealed portions of approved mockup before concealing, and retain photographs digitally at online site available to COR for review.

5. If COR determines mockup does not comply with requirements, modify mockup or construct new mockup until mockup is approved.

a. COR will determine acceptability of color of replacement dutchman repairs and mortar repairs compared to cleaned existing stone.

b. Clean representative existing panels in accordance with Section 04 01 20.52.

6. Approved mockups shall be maintained in undisturbed condition throughout Project as basis for acceptance of completed Work and may become part of completed Work if undisturbed at time of Substantial Completion. Mock up can serve as the first repair installation if approved by the COR .

7. Do not order materials or proceed with repair Work until mockups have been approved by COR.

SECTION 04 01 40.91 Page 7

1.8 DELIVERY, STORAGE, AND HANDLING

A. Deliver, store, and handle materials according to manufacturer's recommendations and in such a manner as to prevent damage or soiling to materials or structure.

B. Deliver materials to Site in original packages with seals unbroken, labeled with manufacturer's name, product brand name and type, date of manufacture, lot number, and directions for storing and mixing with other components.

C. Keep materials dry and do not allow materials to be exposed to moisture during transportation, storage, handling, and installation. Reject and remove from Site new materials which exhibit evidence of moisture during application, or have been exposed to moisture.

D. Store stone panels above ground on non-staining wood skids or other suitable surfaces, with polyethylene sheet between stone and supporting surface. Cover stone panels with waterproof paper, clean canvas, or polyethylene sheet.

1. Use skids constructed of cypress, white pine, poplar, or yellow pine without excessive amount of resin.

2. Do not use skids constructed of chemically-treated wood .

3. Do not use skids constructed of wood containing tannin, such as chestnut, walnut, oak, or fir, or other substances that might stain stone.

E. Store materials in original, undamaged containers in clean, dry, protected location on raised platforms with weather-protective coverings, within temperature range required by material manufacturer.

1. Do not use liquids that have frozen, or cementitious materials that were exposed to moisture.

F. Store sand to maintain grading and other required characteristics and avoid contamination.

G. Locate materials in a secure location approved by COR.

H. Conspicuously mark damaged materials and containers, and opened containers or containers with contaminated materials, and remove from Site as soon as possible. Replace discarded materials in a timely manner at no cost to the Government.

I. Remove and replace materials that cannot be applied within stated shelf life.

J. Maintain copies of all applicable SDS (Safety Data Sheets) with materials in storage area, such that they are available for ready reference on Site.

1.9 PROJECT CONDITIONS

A. Verify existing dimensions and details prior to start of restoration Work. Notify COR of conditions found to be different than those indicated in the Contract Documents. COR will review situation and

SECTION 04 01 40.91 Page 8 inform Contractor of changes.

B. Comply with COR limitations and restrictions for Site use and accessibility.

C. Environmental Limitations: Apply materials when existing and forecast weather conditions permit materials to be installed according to material manufacturer's written instructions.

1. Place cementitious materials only when substrate and ambient temperatures are above 55 degrees F and below 90 degrees F and predicted to remain so during curing period, unless precautions approved by COR are taken.

2. Protect cementitious materials from excessive evaporation of water after placement.

D. Handle and install materials in strict accordance with safety requirements required by material manufacturer; GHS or Material Safety Data Sheets; and local, state, and federal rules and regulations.

Maintain GHS or Material Safety Data Sheets with materials in storage area and available for ready reference on Site.

1.10 CHANGES IN WORK

A. During rehabilitation work, existing conditions may be encountered which are not known or are at variance with the Contract Documents.

Such conditions may interfere with the Work and may consist of damage or deterioration of the substrate or surrounding materials that could jeopardize the integrity or performance of the Work.

1. Notify COR of conditions that may interfere with proper execution of the Work or jeopardize the performance of the Work prior to proceeding with the Work.

PART 2 PRODUCTS

2.1 GENERAL

Source Limitations: Obtain each type of material, including stone, cement, and sand, from one source with resources to provide material of consistent quality in appearance and physical properties.

2.2 NEW STONE: LIMESTONE

A. Material:

1. New Stone: Match color, pre-weathered texture, and graining of the existing stone on the buildings. Submit three finishes in accordance with the ILI Handbook .

a. Color: ASTM D1729

2. Limestone: New limestone for limestone unit replacement and dutchman repairs shall confirm ASTM C568/C568M, medium-density with minimum modulus of rupture of 700 pounds per square inch;

select grade based ILI Handbook , and shall have the following properties:

SECTION 04 01 40.91 Page 9

a. Coefficient of thermal expansion: 0.000003 inch/inch-degree F maximum.

b. Ultimate shear strength: 900 pounds per square inch minimum.

c. Stone thickness: 2 1/2 to 6 inches.

B. Fabrication

1. General:

a. Measure field dimensions necessary for fabrication.

b. Follow jointing shown on Drawings, unless modified by approved shop drawings.

c. Cut panels accurately to shape and dimension.

d. Dress exposed faces true.

e. Exactly match decorative carvings on panels being replaced.

f. Drill holes in panels for anchors as shown on Drawings.

2. Limestone:

a. Cut with grain running horizontally, so that when panels are installed they will be set on their "natural bed."

b. Fabrication tolerances: ILI Handbook .

c. Power wash with clean water at pressure not greater than 200 pounds per square inch prior to shipping.

C. Determine all field dimensions necessary for fabrication of dutchman.

D. Match decorative carvings of units being replaced.

E. COR will inspect dutchman prior to installation.

2.3 NEW STONE: GRANITE

A. New Stone: Match color, pre-weathered texture, and graining of the existing stone on the buildings.

1. Color: ASTM D1729

B. Granite: New granite shall for unit replacement and dutchman repairs shall conform with the ASTM C615/C615M and shall have the following properties:

1. Absorption by weight: 0.40 percent maximum when tested in accordance with ASTM C97/C97M

2. Density: 160 pcf minimum.

3. Compressive strength: 19,000 psi minimum when tested in accordance with ASTM C170/C170M

SECTION 04 01 40.91 Page 10

4. Modulus of rupture: 1,500 psi when tested in accordance with

ASTM C99/C99M.

5. Flexural strength: 1,200 psi minimum when tested in accordance with ASTM C88.

C. All granite to be installed shall be free of cracks, chips, and other defects.

D. Fabrication:

1. General:

a. Measure field dimensions necessary for fabrication.

b. Follow jointing shown on Drawings, unless modified by approved shop drawings.

c. Cut panels accurately to shape and dimension.

d. Dress exposed faces true.

e. Exactly match decorative carvings on panels being replaced.

f. Drill holes in panels for anchors as shown on Drawings.

E. Determine all field dimensions necessary for fabrication of dutchman.

F. Match decorative carvings of units being replaced.

G. COR will inspect dutchman prior to installation .

2.4 REPAIR MATERIALS

A. Stone Components:

1. Dutchmen: Select material for dutchman to match the color, finish, pre-weathered texture, and graining and cut profile of the existing limestone and granite to be repaired, and provide for review by COR prior to installation.

a. Color: ASTM D1729.

b. Setting material: Type N mortar per Section 04 05 01 Masonry Mortar and Grout.

c. Joint Material: Type N mortar per Section 04 05 01 Masonry Mortar and Grout. Sealant per Section 07 92 00 Joint Sealants.

B. Repair Mortar: Intended for patching stone and compatible with Project stones; high bond strength, low shrinkage, and water-vapor permeable.

1. Material colors and textures to be developed by material manufacturer to match Project stones and approved in writing by COR. Provide at least three colors needed to enable matching each piece of stone.

a. Color: ASTM D1729

SECTION 04 01 40.91 Page 11

2. Use one of the following or approved equal:

a. Jahn M70 for limestone and M160 for granite by Cathedral Stone Products, Inc.

1. When patching use Jahn

b. Custom System 45 by Edison Coatings, Inc.

3. Patching Small Areas: Use Last Patch Gel by Bonstone Materials Corp. or an approved equal.

C. Stain:

1. Nawkaw or approved equal:

a. LiTHN: Thin and penetrating colorant stain for masonry, formulate to match existing masonry.

D. Crack Repair Materials:

1. Repair Mortar: Use the following or approved equal:

a. Jahn M70 supplied by Cathedral Stone Products, Inc.

2. Sealant: Sealant per Section 07 92 00.

E. Water: Clean, potable; iron content less than two parts per million, by weight.

F. Anchors and Dowels: ASTM A193/A193M , Grade B8M (Type 304) stainless steel.

1. Helical Repair Anchors: Type 304 stainless-steel spiral rods designed to anchor to the backing and the veneer. Provide driven-in anchors designed to be installed in drilled holes and relying on the screw effect rather than an adhesive to secure them to the backup and the veneer.

a. 8 mm DryFix Ties supplied by Helifix Inc.

b. 8 mm Spira-Lok supplied by Hohmann & Barnard, Inc.

c. Approved equal.

2. Anchors and Dowels: Anchoring system tested and recommended for Project materials and conditions.

a. Threaded rods, fasteners, and components: ASTM A193/A193M , Grade B8M (Type 304) stainless steel.

b. Adhesive Grout: Use one of the following or approved equal:

1) HIT-HY 200-R or HIT-HY 70 hybrid adhesive supplied by Hilti, Inc.

2) AC100+ Gold vinylester supplied by Powers Fasteners.

3. Spring-Loaded Pin Dowel: Use 3/8 inch #355 Spring Loaded Dowels

SECTION 04 01 40.91 Page 12 supplied by Heckmann Building Products Inc., or approved equal.

4. Sleeves around Bolts and Rods: Closed-cell polyethylene sleeves sized to around bolts and rods.

a. Install around portion of bolt or rod in stone panel.

5. Locking Compound for Threaded Fasteners: Vibra-Tite supplied by ND Industries, Inc., or approved equal.

6. Stainless Steel Wire: ASTM A276/A276M , Type 304 stainless steel.

2.5 AUXILIARY MATERIALS

A. Hardware: ASTM A276/A276M , Type 304 stainless steel

1. Fabrication:

a. Bending: Cold-formed bending with maximum inside bend radius of two times nominal material thickness.

1) Inspect bends for cracking by dye-penetrant procedure in accordance with ASTM E165/E165M .

b. Cutting: Use reciprocating saw; do not use saw blades or cutting tools used to cut other materials. Do not flame cut or use other methods involving high temperatures.

c. Holes: Drilled or punched

2. Fabrication:

a. Manufacturers

1) Heckmann Building Products Inc.

{www.heckmannbuildingprods.com}, 1501 N. 31st Avenue Melrose Park, IL 60160-2911, 800-621-4140.

2) Hohmann and Barnard, Inc. {www.h-b.com}, 30 Rasons Court, P.O.

Box 5270, Hauppauge, NY 11788-0270, (631) 234-0600.

3) Approved alternative manufacturer.

b. Size and thickness as shown on the Drawings

c. Remove cutting oils prior to the installation of the stainless steel

B. Miscellaneous Hardware

1. Shims: High-density polyethylene, such as Korolath; thickness as required.

C. Other Materials:

1. Setting Mortar: Type N per Section 04 05 01

2. Sealant: Sealant per Section 07 92 00

SECTION 04 01 40.91 Page 13

PART 3 EXECUTION

3.1 EXAMINATION

A. Examine substrates and conditions for compliance with requirements and other conditions affecting installation or performance of restoration Work.

1. Ensure that work done by other trades is complete and ready for restoration Work.

2. Verify that areas and conditions under which restoration Work is to be performed permit proper and timely completion of Work.

3. Notify COR in writing of conditions which may adversely affect installation or performance of restoration Work and recommend corrections.

4. Do not proceed with restoration Work until adverse conditions have been corrected and reviewed by COR.

5. Commencing restoration Work constitutes acceptance of Work surfaces and conditions.

B. Notify COR of damage or distress not addressed in the Drawings that is observed on existing or salvaged panels prior to commencing Work.

3.2 PROTECTION

A. Take precautions to ensure safety of people (including building users, passers-by, and workers) and protection of property (including adjacent building elements and landscaping).

B. Erect temporary protective canopies and walls, as necessary, at walkways and at points of pedestrian access that must remain in service during Work.

C. Take precautions to protect against air-borne materials and run-off.

D. Protect paving, sidewalk, and adjacent building areas from mechanical damage due to scaffolding and other equipment.

E. Prevent dust, debris, coating overspray/spatter, and other construction materials from coming into contact with pedestrians, motor vehicles, landscaping, buildings, and other surfaces that could be harmed by such contact.

F. Limit access to Work areas.

G. Provide signage including project scope and safety directions for ANC visitors. Signs to be approved by COR.

H. Assume responsibility for injury to persons or damage to property due to Work, and remedy at no cost to the Government.

I. Protect from damage, all elements of completed work and original construction to remain.

SECTION 04 01 40.91 Page 14

3.3 EQUIPMENT

Drilling Holes into Concrete, Masonry, and Stone: Use high-speed, three-jaw-chuck-type, rotary-percussion drill; or coring drill with diamond core bits. Special-direct-system (SDS) hammer drills are not permitted.

3.4 GENERAL

A. Allow COR to inspect Work before permanently covering or concealing.

B. Maintain stone units in secure and stable position at all times.

1. Shore adjacent stone units as necessary to prevent shifting or collapse during repair or replacement of stone units.

2. Stabilize stone units with anchors where specified prior to commencing other repair Work.

C. Protection of Work:

1. Temporarily mask adjacent surfaces to prevent staining from repair materials. Promptly remove spilled materials and clean soiled surfaces.

2. Protect wall from mortar droppings and promptly remove.

3. At the end of the day or when Work is not in progress, cover openings and partially completed Work to prevent infiltration of moisture, insects, or animals.

a. Extend cover beyond edges of openings or Work and secure tightly.

4. Secure stone to structure at end of each working period.

5. Protect wall from mortar droppings at all times.

3.5 REMOVAL AND REPLACEMENT OF STONE VENEER UNITS

A. Carefully remove stone panels to avoid damaging adjacent stone panels, substrate, and other facade elements.

1. If stone panels will be reused, mark panel with unique identifying code and record code on elevation drawing to ensure reinstallation in proper location.

2. Stabilize cladding units or otherwise provide temporary support for all units that are effected by unit removal.

B. Salvaged Stone:

1. Inspect salvaged stone panels for damage such as chipping, cracking, or spalling. Notify COR of damage observed.

2. Clean mortar, sealant, and residue from surfaces that will be exposed or bonded to.

C. Install stone panels as shown on shop drawings, clean of dust and

SECTION 04 01 40.91 Page 15 debris:

1. Support stone panel for gravity and lateral loads.

a. Install supports, anchors, fasteners and other attachments in accordance with supplier's written instructions.

b. Drill holes in stone panel without spalling backside of panel.

Use only rotary percussion drill.

2. Attach stone support framing to backup at connection points indicated.

3. Isolate dissimilar metals.

4. Fill kerfs completely with sealant.

D. Install stone panel, plumb, square, and true to line.

1. Align with adjacent units and maintain existing joint dimensions (typically 1/4 inch horizontal joints and 1/4 inch vertical joints).

2. Notify COR prior to deviating from specified alignment.

3. Adjust anchors, supports, and accessories as necessary to position stone panel.

4. Adjust anchors, supports, and accessories as necessary to position stone panel.

a. Size shims to avoid overstressing stone.

b. Use single shim of required thickness where possible .

c. If shim stack is required, use shim thickness combination resulting in fewest shims. Adhere or pin together shim stacks.

d. Maximum thickness of shim stack: 1 inch or as indicated on shop drawings.

5. For mortar-joint installations:

a. Set stone panel in full bed of setting mortar.

b. Fill vertical joints with setting mortar and shush full.

c. Maintain vertical joints to receive sealant completely clear of mortar for full depth and height.

d. After mortar has achieved initial set, rake out mortar to depth of 3/4 inch and point joints in accordance with Section 04 01 27.

6. Fill lifting holes in top bed joints or other locations where moisture can collect with non-expanding grout or high-modulus elastomeric sealant after installation and final alignment .

7. Maintain joints between bottom of support angles and top edges

SECTION 04 01 40.91 Page 16 of stone panels and vertical joints between stone panels free of hard inclusions.

8. Maintain cavities and collar joints open where unfilled space is indicated between back of stone veneer and back-up.

E. Install mortar or backer rod and sealant in joints designated to be sealed in accordance with the Drawings.

3.6 STABILIZING STONE PANELS

A. Install anchors at locations designated on Drawings, in accordance with anchor manufacturer's written instructions and recommendations.

1. Locate anchors at least 3 inches from voids, heavy veins, cracks, and panel edges.

B. Take necessary precautions to avoid spalls or other distress during drilling and anchor installation operations. Notify COR of distress that occurs.

C. Carefully 3/8-inch-diameter holes through stone into concrete backup material. Follow anchor manufacturer's written requirements for hole diameter and embedment into backup material.

1. When drilling through stone, use rotary hammer drill set on rotary. Do not use an SDS hammer drill.

2. If steel is encountered in backup material, stop drilling immediately. Drill new hole maximum of 4 inches radially from first hole. Patch unused hole with repair mortar.

D. Remove dust and debris from hole by blowing oil-free compressed air into hole.

E. Install anchors in accordance with anchor manufacturer's recommendations. Countersink anchors 1/2 inch beyond surface of stone.

F. Mask face of stone and install repair mortar in hole over anchor in accordance with mortar manufacturer's instructions and recommendations. Wipe excess mortar off stone surface with clean, slightly moistened cloth, leaving grout flush with stone surface.

1. After 72 hours, lightly buff stone surface to remove excess material.

3.7 DUTCHMAN REPAIRS

A. At locations designated for dutchman repair on Drawings, cut out immediate area of spall, adjacent unsound stone, and, as necessary, sound stone to form rectangular removal area to a full depth of the stone. Remove existing repairs in their entirety.

B. Inspect exposed backup material and notify COR of visible distress or deterioration. Repair backup material as specified or as directed by

COR.

C. Fabricate dutchman to match color and pre-weathered texture of adjacent stone or approved mockup. Maintain the following tolerances

SECTION 04 01 40.91 Page 17 unless otherwise indicated on Drawings:

1. oints between dutchman and parent stone: 1/8 inch.

2. Joints at stone perimeter: Match edge of parent stone, +/- 1/8 inch.

D. Install dutchman as shown on Drawings.

1. Install at least two pins per dutchman repair unless indicated otherwise.

a. Drill holes with diameter 1/16 inch larger than pin diameter, extending at least 1 1/2 inches into parent stone and dutchman.

b. Set pins in mortar. Do not allow sealant to drip onto exterior face of stone.

2. Set dutchman in thin bed of setting mortar on edges adjacent to parent stone.

a. Provide shims at wall cavities to properly position dutchman.

b. Promptly remove material from exposed stone face.

3.8 PATCHING

A. At locations designated for patching, remove unsound stone, prepare surfaces, and install repair mortar.

B. Surface Preparation:

1. Cut out loose and deteriorated stone.

2. Remove additional sound stone with hand tools.

a. 1/16 inch minimum additional removal.

b. As necessary to achieve minimum removal depth of 1 inch, but not less than minimum depth recommended by repair mortar manufacturer.

c. Do not damage adjacent sound stone.

3. Eliminate feathered edges and provide undercut perimeter where possible with minimum specified depth.

4. If removal area includes existing patch, remove entire patch.

5. Use manual or pneumatic cutting equipment. Do not use saws.

6. Notify COR if removal depth is 3 inches or more.

7. Provide prepared surfaces that are clean, sound, stable, and free of loose particles, dust, soil, debris, grease, oil, and other contaminants. Surfaces shall be clean but rough cut and tooled to assure optimum bonding of repair mortar.

8. Tap stone surfaces with acrylic hammer to verify that stone is solid and stable.

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9. Install stainless-steel tap cons and wire as shown on Drawings.

a. For patching with Jahn, Catheredral Stone only use mechanical anchor and dowels that are stainless steel threaded rod ASTM F593 with a diameter as indicated on Contract Drawings, bent and cut to lengths required to achieve embedments shown on the Contract Drawings.

10. Wash stone surfaces with clean water while scrubbing with stiff-bristle brush.

C. Placing Repair Mortar:

1. Mix, place, and cure repair mortar in accordance with mortar manufacturer's recommendations.

2. Wet stone surfaces and maintain in saturated-surface dry condition.

3. Mix repair mortar in individual batch to match stone panel being patched. Combine one or more colors of repair mortar as needed to produce exact match.

4. Place repair mortar with trowel in lifts, with no waiting period or scratch coat necessary between lifts, to maximum total thickness of 3 inches.

a. Do not use bonding agent.

b. Use light pressure during placement.

c. Work mortar firmly into surface of stone, including corners and under and around mechanical anchors.

d. For patches thicker than 3 inches, apply repair mortar in two lifts.

1) Place first lift and allow to set.

2) Scrape off about 1/16 inch of mortar if cement skin has formed.

3) Dampen surface and place second lift.

5. Build up repair mortar slightly above adjacent stone surface.

Allow mortar to set slightly, typically 15 to 30 minutes depending on weather. Scrape off excess material using straight edge such as plasterer's miter rod. Do not press down or "float" patch.

6. Where patches occur at panel edges or corners, form repair mortar to match profile of adjacent stone.

7. Clean repair mortar from adjacent stone surfaces by rubbing with sponge and clean water, before mortar dries. Wipe several times to prevent staining or halo effect on stone.

8. Finish patch to blend in with adjacent stone.

a. Fine smooth profile: trowel mortar at time of initial set or polish mortar with fine carborundum paper when mortar is

SECTION 04 01 40.91 Page 19 sufficiently hard, about seven days after placement.

b. Simulation of rough stone finish.

9. Shaping, forming of details, and tooling: approximately five hours after placement.

10. Scraping to profile or level with metal tools, and finishing work: within 24 hours up to two to three days after placement.

11. Feather edging: At least five to seven days after placement.

12. Placement Limitations:

a. Stone surfaces shall not have frost or be exceedingly hot.

b. Protect repair mortar from extreme heat, freezing, excessive wind, direct sunlight, and rain. Ambient temperature range shall be 40 to 90 degrees F with low to average humidity.

c. If it is necessary to place repair mortar with ambient temperature above 90 degrees F, use special precautions recommended by mortar manufacturer.

D. Curing: Maintain patches in moist condition and protect from direct sun and wind.

1. Periodically mist patches with clean water for at least three days after placement. Mist several times each day. Avoid water runoff onto adjacent stone surfaces.

2. Mist patches with clean water within 30 to 60 minutes after placement in hot, dry ambient conditions and within several hours in cool, damp ambient conditions.

3. Mist patches with clean water for at least three minutes at the end of the day of placement.

4. Securely install burlap or plastic sheets over patches. Maintain clear gap of 3 to 4 inches between sheets and patch surfaces.

3.9 CRACK REPAIRS

A. Inject crack with epoxy and/or install pointing mortar as shown on Drawings or directed by COR, in cracks designated for repair.

B. Grout Injection:

1. Remove loose material in crack with oil-free compressed air.

2. Wash surface and interior of crack with clean water applied with clean syringe, to remove dust and loose or deleterious material which could prevent proper flow or adhesion of grout.

3. Drill holes and install injection ports.

4. Seal cracks at stone surface with removable, non-staining clay or repair mortar.

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5. Immediately prior to injection, moisten interior of crack by flushing with clean water using clean syringe. Repeat flushing if interior crack surfaces dry out before grout is injected.

6. Mix grout in accordance with grout manufacturer's recommendations.

a. Inject grout sequentially into ports with clean syringe, to ensure complete filling of crack. Allow continuous flow into crack crevice.

b. Verify that crack seal remains intact and repeat process until crack is filled.

c. Clean grout from stone surface immediately.

7. Remove crack seal and injection ports after 48 hours.

8. At direction of COR, rout crack crevice and point crack crevice or groove with repair mortar using clean, fine chisel.

a. Allow to dry for 24 hours.

b. Apply final lift in thin layer, flush with stone surface.

c. Match finish of adjacent surface by raking with trowel at time of initial setting or by polishing with fine carborundum paper after material is sufficiently hard, approximately seven days after placement.

3.10 STAINING STONE/PATCHES

A. Examination:

1. All masonry materials to been allowed to cure for a minimum of 21 days prior to starting staining.

2. Verify surfaces have a neutral pH.

B. Preparation

1. Clean surfaces thoroughly prior to installation. Allow surfaces to dry completely before applying coating.

2. Before application ascertain that the masonry walls have a neutral ph level or all warranties are void.

C. Installation

1. Do not proceed with work if temperatures are less than 40 degrees or greater than 90 degrees.

2. Verify color uniformity 36 hours after applications. Recoat area where surface is not uniform.

3.11 MISCELLANEOUS REPAIRS

A. Exposed Steel Elements:

1. Notify COR of steel anchors and other elements exposed during

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Work. COR will determine if steel element should be removed or painted.

2. Remove steel elements as directed by COR.

a. Core drill small plug if necessary at anchors .

3. Repair visible voids in stone with dutchman repairs.

3.12 FIELD QUALITY CONTROL

A. Inspect new fabricated stone panels for dimensional accuracy, finish, color, and defects, and replace stone that does not meet requirements or approved samples. Verify acceptability of color in accordance with

ASTM D1729.

1. Inspection by COR:

a. Notify COR of arrival of stone at Site.

b. COR may inspect stone panels, rebates, kerfs, and dowel holes.

Move stone panels as necessary to facilitate inspection.

c. COR may verify acceptability of color in accordance with

ASTM D1729.

d. Do not install stone panels until COR have inspected panels.

2. Pay additional costs to acquire new stone panels to replace rejected stone panels, including costs related to removing and replacing stone panels installed on building prior to review and acceptance by COR.

B. Inspect installed repairs for soundness and conformance with requirements. Remove and replace repairs that are unsound, defective, or do not meet requirements.

C. Provide access to Work area for COR to observe progress and quality of installed Work. Notify COR at least 48 hours in advance of time when access equipment will be relocated.

3.13 CLEANING

A. After completing stone restoration Work:

1. Clean affected stone cladding by rubbing with fiber brushes and clean water.

2. Remove Contractor-provided scaffolding and equipment, and patch anchor holes.

B. At the end of each workday, broom-clean Site and Work areas and place all items to be discarded in appropriate containers.

C. Return building surfaces to condition prior to cleaning Work, to satisfaction of COR at no additional cost to the Government.

D. Repair at no cost to the Government all items damaged during the Work.

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E. Clean up debris, refuse, and surplus material; remove from premises;

and dispose of legally.

-- End of Section --

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