044200_mc_exterior_stone_cladding_add01.pdf

General Services Administration Bid Set Phillip Burton FB Infrastructure Project 450 Golden Gate Ave., San Francisco, CA Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) EXTERIOR STONE CLADDING

PROPERTY OF UNITED STATES GOVERNMENT 044200 - 1

FOR OFFICIAL USE ONLY ADDENDUM 01 - 05/05/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

SECTION 044200 – EXTERIOR STONE CLADDING, Addendum 01

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. The Government is providing the references included in this sub-section for information purposes only and is not intended to provide a comprehensive, all-inclusive list of any and all potentially relevant portions of the Contract Documents. Drawings and general provisions of the Contract and other Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section includes:

1. Stone veneer.

2. Mortar, grout and accessories.

B. Work furnished but installed in other Sections:

1. Division 3 for stone veneer faced architectural precast concrete panels.

1.3 REFERENCES

A. NBGQA for granite.

1.4 SUBMITTALS

A. Shop drawings:

1. Cutting and setting drawings showing sizes, dimensions, sections and profiles of stone, the arrangement and provisions for jointing, anchoring and fastening, supports, and other necessary details for, and reception of other work.

2. Indicate location of each stone on the setting drawings with number designation corresponding to number marked on each unit.

3. Show location of inserts (for stone anchors and supports) to be built into or attached to supporting work.

4. EOR is to review and accept deferred submittals before submitting to GSA for acceptance.

B. Samples:

1. 3 sets, not less than 12-inch by 12-inch, showing the full range of stone color, finish and texture variations to be expected in the Work.

2. 3 sets, not less than 6-inch by 3/8-inch by 1/4-inch wide grout samples, color matching existing.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) EXTERIOR STONE CLADDING

PROPERTY OF UNITED STATES GOVERNMENT 044200 - 2

FOR OFFICIAL USE ONLY ADDENDUM 01 - 05/05/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

C. Stone suppliers test records:

1. Copies of the stone suppliers' test reports of compressive and flexural strength tests performed by the stone supplier(s), or recognized testing laboratories, on each type of stone required for the Work.

2. Testing shall be performed in accordance with procedures and methods recommended by MIA for the type of stone to be used.

1.5 QUALITY ASSURANCE

A. Stone fabricator’s qualifications: Firm with a minimum of 5 years of successful experience in work similar to that required for this Project.

B. Available stock: Before start of fabrication, certify in writing, to the Contracting Officer, that sufficient stock of the approved stone is available and on hand for completion of the work of this Contract, within the Contract time schedule.

C. Stone veneer attachment and anchorage system:

1. Engineer the stone attachment and anchorage system, within the physical limitations indicated complying, as a minimum with ASTM C 1242..

2. Fasteners and connections are shown schematically. A California-licensed professional engineer, employed by the Contractor, shall determine final types and sizes.

3. Where required, obtain approval of authorities having jurisdiction for the anchorage system, after submitting shop drawings to the Contracting Officer, and pay costs therefore.

a. Fasteners or connections shall not conflict with or require revision of the finish profiles of the stone and the supporting work.

b. Connections to the structural frame shall not impose eccentric loading, or induce twisting or warping.

c. Connections to the structural frame shall be able to accommodate misalignment of the steel structure within limits allowed by the AISC tolerances.

D. Uniformity:

1. Obtain all similar stone from matched blocks from the same quarry, with consistent color range and texture. For adjacent pieces, fabricate veneer from the same block or contiguous blocks.

2. Uniformity of the stone veining, texture, and color are of paramount importance. Extreme range of stone veining, texture and color must be approved by the Contracting Officer on at least 20 full size samples prior to signing of contract for stone procurement.

3. Stone surfaces to be exposed in the Work showing varying levels of sheen and texture from stone-to-stone, and stone showing "wheel" and other fabrication marks will be rejected and require replacements at no extra cost to Government.

4. The Contractor will be required to balance and harmonize the stone installation to prevent pieces with extreme variations of color and patterns from being installed next to each other (light next to dark, patterned next to plain, etc.)

E. Mockup:

1. Install a mockup of each type of stonework assembly including grout for the Contracting

Officer's review. See Drawings for specific areas to be represented.

2. Do not proceed with final installation until approval of the mockup is obtained.

3. Approved mockups may remain a portion of the complete work.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) EXTERIOR STONE CLADDING

PROPERTY OF UNITED STATES GOVERNMENT 044200 - 3

FOR OFFICIAL USE ONLY ADDENDUM 01 - 05/05/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

1.6 HANDLING

A. Handling:

1. To prevent chipping, breaking, soiling and other damage.

2. Do not use pinch or wrecking bars without protecting stone edges with wood covers tied securely in place.

3. Lift stone with non-staining wide belt type slings wherever possible; donot use wire rope or ropes containing staining substances.

B. Storage:

1. On wood skids or pallets and covered with non-staining, waterproof covering permitting free air circulation.

2. Place and stack stone to distribute its weight evenly and to prevent its breaking or cracking.

C. Protection: Protect stone against damage during its fabrication, handling and installation.

1.7 MAINTENANCE MATERIALS

A. Furnish attic stock stone materials and assemblies, that matches installed items, from matched blocks from the same quarry for each similar stone type. Attic stock materials, assemblies and quantities shown on Drawings.

1. Extra stone materials and assemblies shall be stacked on pallets, supported if necessary, protected with protective covering for storage and identified with labels describing contents.

PART 2 - PRODUCTS

2.1 STONE

A. General:

1. Granite free of checks, spalls, stains, discoloration, unusual patterns or other imperfections, matching the Contracting Officer’s control samples and complying, as a minimum, to ASTM C 615.

2. The Contracting Officer’s acceptance of inherent variations characteristic of the quarry from which the stone is taken must be obtained before stones are finished.

3. Stone salvaged from the selective demolition phase shall be used whenever possible.

B. Stone types and source:

1. Type A: Iridian Granite with a polished finish by Coldspring, visually matching existing.

2. Type B: Charcoal Black Granite with a polished finish by Coldspring, visually matching existing.

3. Type C: Sierra White Granite with a flamed (thermal) finish by Coldspring, visually matching existing.

C. Strip liner: Any sound stone of the same kind as the piece it is being laminated to.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) EXTERIOR STONE CLADDING

PROPERTY OF UNITED STATES GOVERNMENT 044200 - 4

FOR OFFICIAL USE ONLY ADDENDUM 01 - 05/05/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

2.2 MORTAR AND GROUT

A. Cement: White Portland cement, conforming to ASTM C 150, Type I, except complying with the staining requirements of ASTM C 91 for not more than 0.03 percent water soluble alkali.

B. Setting plaster: Plaster of Paris, ASTM C 59.

C. Hydrated lime: ASTM C 207, Type S.

D. Sand: ASTM C 144, non-staining.

E. Water: Potable and fresh.

F. Color: Grout color shall match existing and approved sample and mockup.

2.3 STONEWORK ACCESSORIES

A. Stone anchors: Type, number and size to satisfy Code requirements, except that anchors and ties for exterior stonework must be stainless steel or non-ferrous metals.

B. Setting buttons: Plastic or aluminum of the size required to maintain uniform joint widths.

C. Sealant and backing: Refer to Drawings and as specified in Section 07 9200.

2.4 MIXES

A. For hardware installation, spots and joints: One part cement, 3 parts sand and 1/5 part lime.

B. For solid grouting: One part cement and 3 parts sand.

C. For setting bed: As specified hereafter.

2.5 FABRICATION

A. General:

1. Fabricate stonework as detailed on final shop drawings and in compliance with the recommendations of the applicable stone association.

2. Stones that have been patched and filled are not acceptable.

3. Do not use stones showing “checker boarding” (varying level of sheen from stone-to-stone) and stone surfaces showing “wheel” or fabrication marks.

4. Provide greater stone thickness than indicated where (a) stone thickness indicated is insufficient for the stone size, (b) the extent of the cut-outs decreases the strength of the remaining material, and (c) required for secure anchorage and adequate bearing areas or surfaces.

5. Finish all exposed surfaces, including exposed edges, as indicated on the Drawings and to match approved samples.

6. Provide holes and slots cut or drilled for anchors, fasteners, supports and lifting devices, as shown and as necessary to secure stonework in place. Make holes and slots in the edge of the stone a minimum of 3/4-inch deep and center between the faces.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) EXTERIOR STONE CLADDING

PROPERTY OF UNITED STATES GOVERNMENT 044200 - 5

FOR OFFICIAL USE ONLY ADDENDUM 01 - 05/05/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

7. Cut and back-check stone as required for proper fit and clearance. Shape beds to fit supports.

8. Glue and dowel liner securely to back of panels.

B. Contiguous work:

1. Provide chases, reveals, reglets, openings and similar spaces and features required for contiguous work.

2. Coordinate with Drawings and final shop drawings.

C. Cutting:

1. Cut stonework accurately to shapes and dimensions shown on final shop drawings, maintaining fabrication tolerances of the applicable stone association.

2. Where veining direction is indicated, is critical for uniformity, or is selected during mockup construction and review, mark vein direction on back of each panel with an arrow.

3. Dress joints (bed and vertical) straight and perpendicular to stone face.

4. Layout stone to provide uniform width joints as indicated on Drawings.

D. Fabrication tolerances:

1. Unless otherwise required to maintain construction tolerances or coordination with supports and attachments, comply with applicable stone association for finish, bedding dimensions and other requirements.

2. When options are allowed by the stone association, the more stringent applies. Backs of pieces shall always be sawn.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine conditions and measurements affecting the work of this Section at site.

B. Where appropriate, verify that setting bed is firm, dry, clean, and free from oil or waxy films, and within a tolerance of 1/8 inch in 8 feet.

C. Verify that installation of grounds, anchors, recessed frames, and similar items located in or behind stone have been completed before installing tile.

D. Correct conditions detrimental to the proper and timely completion of this work before proceeding with installation.

3.2 INSTALLATION

A. General:

1. Do not use stone with chips, cracks, voids, stains and other defects, which might be visible in the finished work.

2. Do not fill and patch stone before installation.

3. Clean stone before setting. If paving stones are not thoroughly wet at time of setting, drench or sponge stone.

4. Employ skilled stone fitters at the site to do necessary field cutting as stone is set.

5. Do not allow stone to contact ferrous metal surfaces.

6. Set stone in compliance with the accepted shop drawings.

Bldg. No. CA-0154ZZ

SENSITIVE BUT UNCLASSIFIED (SBU) EXTERIOR STONE CLADDING

PROPERTY OF UNITED STATES GOVERNMENT 044200 - 6

FOR OFFICIAL USE ONLY ADDENDUM 01 - 05/05/16

Do not remove this notice. Properly destroy or return documents when no longer needed.

7. Select stones to avoid objectionable variations in color, texture and grain between adjacent pieces as approved by the Contracting Officer.

B. Veneer cladding:

1. Provide anchors, supports, fasteners and other attachments to securely anchor stonework in place. Comply with ASTM C 1242 and approved shop drawings.

2. Shim and adjust accessories as required for proper setting of stone.

3. Completely fill holes, slots and other sinkages for anchors, dowels, fasteners and supports with mortar sealant during setting of stones.

4. Install veneer plumb and level with joints uniform in width and accurately aligned.

5. Set stone by spotting back of pieces at anchor locations and at 18-inch o.c. with setting mortar, except for bases within 8 ft. of AFF, which shall be fully grouted. Take care to prevent displacement of stones while grouting.

6. Provide setting buttons to prevent extrusion of mortar.

7. Fill cavity between back of stone and backup solid.

8. Fill joints of veneer with backup and sealant specified in Section 07 9200. Tool joints slightly concave.

C. Control joints: Provide joints where shown. Install continuous strips of preformed joint filler to allow for installation of backer rod and sealant specified in Section 07 9200.

3.3 TOLERANCES

A. Tolerances for the building frame and other work are specified in other Sections. Make provisions for these tolerances in designing and installing stonework and its anchorage system so that when completed stonework shall be within the following tolerances.

1. Sealant joint width between stone pieces: Plus 1/8 inch.

2. Overall length and height (or width) stone edge to stone edge: plus 1/16 inch.

3. Offset (in/out) between adjacent stone edges: 1/16 inch maximum.

4. Thickness nominal 2 inches: 1/16 inch.

5. Where more than one tolerance applies, the more restrictive shall govern.

B. Correct errors and inconsistencies.

3.4 ADJUSTING/CLEANING

A. Repair of stone will be permitted only when the piece to be repaired is marked for easy identification and the results are acceptable to the Contracting Officer; otherwise remove and replace pieces which are loose, hollow sounding (indicating poor bonding to setting bed), broken, chipped, stained or otherwise damaged.

1. Provide new matching stones, then install as specified and point-up joints to eliminate evidence of replacement.

2. Repoint defective and unsatisfactory joints to provide a neat, uniform appearance.

B. Clean stonework after sealant has cured using clean water and stiff-bristle brushes. Do not use wire brushes, acid type cleaning agents or other cleaning compounds with caustic or harsh fillers.

END OF SECTION 044200