Add002 Cover letter.pdf

1819 Peachtree Rd. NE, Suite 102 Atlanta, GA 30309 t: 404.633.4264 f: 404.870.7337 houserwalker.com info@houserwalker.com

February 23, 2021

Christopher Blackburn Project Manager, GSA

Project USCIS at Peachtree Summit Re: Addendum 002

Chris, Please find attached the updated specification for glazing in response to bidder’s questions regarding the replacement glazing unit. The spec adds the two glass types approved for use as replacement glazing for the building. Changes have been underlined. No substitutions will be accepted. Note that the contractor should price both options because the Building Manager has seen a large cost difference between the two in the past.

This issue includes the following:

Spec 08 8000 Rev2- Glazing

Sincerely, Tom Butler Houser Walker Architecture

File: DOCUMENT1

USCIS N170152 Addendum 002 Issued:02/23/2021

GLAZING

08 8000 - 1

SECTION 08 8000

PART 1 GENERAL

1.01 SECTION INCLUDES

A. Replacement Insulating glass units.

B. Glazing units, at side lights and vision panels.

C. Plastic films.

1.02 RELATED REQUIREMENTS

A. Section 08 1113 - Hollow Metal Doors and Frames: Glazed lites in doors and borrowed lites.

B. Section 08 1416 - Flush Wood Doors: Glazed lites in doors.

1.03 REFERENCE STANDARDS

A. 16 CFR 1201 - Safety Standard for Architectural Glazing Materials; current edition.

B. ANSI Z97.1 - American National Standard for Safety Glazing Materials Used in Buildings -

Safety Performance Specifications and Methods of Test; 2015.

C. ASTM C864 - Standard Specification for Dense Elastomeric Compression Seal Gaskets, Setting Blocks, and Spacers; 2005 (Reapproved 2015).

D. ASTM C1048 - Standard Specification for Heat-Strengthened and Fully Tempered Flat Glass;

2012.

E. ASTM C1376 - Standard Specification for Pyrolytic and Vacuum Deposition Coatings on Flat

Glass; 2015.

F. ASTM E1300 - Standard Practice for Determining Load Resistance of Glass in Buildings; 2016.

G. ASTM E2190 - Standard Specification for Insulating Glass Unit Performance and Evaluation;

2010.

H. ICC (IBC) - International Building Code; 2015.

I. NFRC 100 - Procedure for Determining Fenestration Product U-factors; 2017.

J. NFRC 200 - Procedure for Determining Fenestration Product Solar Heat Gain Coefficient and

Visible Transmittance at Normal Incidence; 2014, with Errata (2017).

K. NFRC 300 - Test Method for Determining the Solar Optical Properties of Glazing Materials and

Systems; 2017.

1.04 SUBMITTALS

A. See Section 01 3000 - Administrative Requirements, for submittal procedures.

B. Product Data on Glazing Unit and Plastic Film Glazing Types: Provide structural, physical and environmental characteristics, size limitations, special handling and installation requirements.

C. Product Data on Glazing Compounds and Accessories: Provide chemical, functional, and environmental characteristics, limitations, special application requirements, and identify available colors.

D. Samples: Submit 4 samples 12 by 12 inch in size of glass units.

E. Samples: Sumbit 4 sample 4in. x 4 in.in size of window film.

1.05 MOCK-UPS

A. Provide mock-up of applied film including glass.

B. Provide on-site glazing mock-up with the specified glazing components.

C. Locate as indicated by Architect.

D. Mock-ups may remain as part of the Work.

http://www.ecfr.gov/ http://global.ihs.com/doc_detail.cfm?rid=BSD&document_name=ANSI%20Z97.1 http://global.ihs.com/doc_detail.cfm?rid=BSD&document_name=ASTM%20C864 http://global.ihs.com/doc_detail.cfm?rid=BSD&document_name=ASTM%20C1048 http://global.ihs.com/doc_detail.cfm?rid=BSD&document_name=ASTM%20C1376 http://global.ihs.com/doc_detail.cfm?rid=BSD&document_name=ASTM%20E1300 https://global.ihs.com/doc_detail.cfm?rid=BSD&document_name=ASTM%20E2190 https://global.ihs.com/doc_detail.cfm?rid=BSD&document_name=ICC%20I-CODE%20IBC http://global.ihs.com/doc_detail.cfm?rid=BSD&document_name=NFRC%20100 http://global.ihs.com/doc_detail.cfm?rid=BSD&document_name=NFRC%20200 http://www.nfrc.org/

08 8000 - 2

PART 2 PRODUCTS

2.01 PERFORMANCE REQUIREMENTS - EXTERIOR GLAZING ASSEMBLIES

A. Provide type and thickness of exterior glazing assemblies to support assembly dead loads, and to withstand live loads caused by positive and negative wind pressure acting normal to plane of glass.

1. Comply with ASTM E1300 for design load resistance of glass type, thickness, dimensions, and maximum lateral deflection of supported glass.

2. Provide glass edge support system sufficiently stiff to limit the lateral deflection of supported glass edges to less than 1/175 of their lengths under specified design load.

3. Glass thicknesses listed are minimum.

B. Vapor Retarder and Air Barrier Seals: Provide completed assemblies that maintain continuity of building enclosure vapor retarder and air barrier.

1. In conjunction with vapor retarder and joint sealer materials described in other sections.

C. Thermal and Optical Performance: Provide exterior glazing products with performance properties as indicated. Performance properties are in accordance with manufacturer's published data as determined with the following procedures and/or test methods:

1. Center of Glass U-Value: Comply with NFRC 100 using Lawrence Berkeley National

Laboratory (LBNL) WINDOW 6.3 computer program.

2. Center of Glass Solar Heat Gain Coefficient (SHGC): Comply with NFRC 200 using

Lawrence Berkeley National Laboratory (LBNL) WINDOW 6.3 computer program.

3. Solar Optical Properties: Comply with NFRC 300 test method.

2.02 GLASS MATERIALS

A. Float Glass: Provide float glass based glazing unless noted otherwise.

1. Kind HS - Heat-Strengthened Type: Complies with ASTM C1048.

2. Kind FT - Fully Tempered Type: Complies with ASTM C1048.

3. Fully Tempered Safety Glass: Complies with ANSI Z97.1 and 16 CFR 1201 criteria.

2.03 INSULATING GLASS UNITS

A. Manufacturers:

1. Viracon, Apogee Enterprises, Inc: www.viracon.com/#sle.

2. Oldcastle Building Envelope: https://obe.com/

B. Insulating Glass Units: Types as indicated.

1. Durability: Certified by an independent testing agency to comply with ASTM E2190.

2. Coated Glass: Comply with requirements of ASTM C1376 for pyrolytic (hard-coat) or magnetic sputter vapor deposition (soft-coat) type coatings on flat glass; coated vision glass, Kind CV; coated overhead glass, Kind CO; or coated spandrel glass, Kind CS.

3. Spacer Color: Gray.

4. Edge Seal:

a. Color: Black.

5. Purge interpane space with dry air, hermetically sealed.

C. Type IG-1 - Insulating Glass Units: Vision glass, double glazed.

1. Applications: Option 1 for window replacement, Viracon.

2. Space between lites filled with air.

3. Outboard Lite: Fully tempered float glass, 1/4 inch thick, minimum.

a. Tint: Clear.

b. Coating: VA1-18, on #2 surface.

4. Inboard Lite: Fully tempered float glass, 1/4 inch thick, minimum.

a. Tint: Clear.

5. Total Thickness: 1 inch.

D. Type IG-2 - Insulating Glass Units: Vision glass, double glazed.

1. Applications: Option 2 for window replacement, Oldcastle.

2. Space between lites filled with air.

http://global.ihs.com/doc_detail.cfm?rid=BSD&document_name=ASTM%20E1300 http://global.ihs.com/doc_detail.cfm?rid=BSD&document_name=NFRC%20100 http://global.ihs.com/doc_detail.cfm?rid=BSD&document_name=NFRC%20200 http://www.nfrc.org/ http://global.ihs.com/doc_detail.cfm?rid=BSD&document_name=ASTM%20C1048 http://global.ihs.com/doc_detail.cfm?rid=BSD&document_name=ASTM%20C1048 http://global.ihs.com/doc_detail.cfm?rid=BSD&document_name=ANSI%20Z97.1 http://www.ecfr.gov/ http://www.viracon.com/#sle https://obe.com/ https://global.ihs.com/doc_detail.cfm?rid=BSD&document_name=ASTM%20E2190 http://global.ihs.com/doc_detail.cfm?rid=BSD&document_name=ASTM%20C1376

08 8000 - 3

3. Outboard Lite: Fully tempered float glass, 1/4 inch thick, minimum.

a. Tint: Clear.

b. Coating: Silver 20, on #2 surface.

4. Inboard Lite: Fully tempered float glass, 1/4 inch thick, minimum.

a. Tint: Clear.

b. Coating: Energy Advantage, on #3 surface.

5. Total Thickness: 1 inch.

2.04 PLASTIC FILMS

A. Type WF-1 - Decorative Plastic Film: Polyester type.

1. Application: Locations as indicated on drawings.

2. Color: White Matte.

3. Manufacturers:

a. Solyx, https://www.solyxfilms.com/.

b. Substitutions: Refer to Section 01 6000 - Product Requirements.

2.05 ACCESSORIES

A. Setting Blocks: Silicone, with 80 to 90 Shore A durometer hardness; ASTM C864 Option II.

Length of 0.1 inch for each square foot of glazing or minimum 4 inch by width of glazing rabbet space minus 1/16 inch by height to suit glazing method and pane weight and area.

B. Glazing Tape, Back Bedding Mastic Type: Preformed, butyl-based, 100 percent solids compound with integral resilient spacer rod applicable to application indicated; 5 to 30 cured Shore A durometer hardness; coiled on release paper; black color.

PART 3 EXECUTION

3.01 VERIFICATION OF CONDITIONS

A. The replacement of the glazing units is being done with the acknkowlegedment that the frames are exisiting and actual count and location of units to be replaced will be done in the field.

1. Verify that openings for glazing are correctly sized and within tolerances, including those for size, squareness, and offsets at corners.

2. Verify that surfaces of glazing channels or recesses are clean, free of obstructions that may impede moisture movement, weeps are clear, and support framing is ready to receive glazing system.

3.02 PREPARATION

A. Clean contact surfaces with appropriate solvent and wipe dry immediately before glazing.

Remove coatings that are not tightly bonded to substrates.

B. Seal porous glazing channels or recesses with substrate compatible primer or sealer.

C. Prime surfaces scheduled to receive sealant where required for proper sealant adhesion.

3.03 INSTALLATION, GENERAL

A. Glazing replacement must be done in a manner that will allow for immediate replacement of the glass once the old unit is removed. If immediate replacement is not possible, the contracor must coodinate temporary protection measures with the building manager.

END OF SECTION