HomeMy WebLinkAboutARB202000082 Correspondence 2020-09-21 (2)Glass and Glazing
SECTION 08800 — GLASS AND GLAZING
PART1 GENERAL
1.0 SECTION INCLUDES
A. Glass glazed into frames (except factory glazed windows).
B. Setting materials and cleaners.
1.1 RELATED SECTIONS
A. Section 10820 - Toilet Accessories: For framed mirrors.
1.2 QUALITY ASSURANCE
A. Unless otherwise shown, or governed by other reference standards specified, conform
with details and procedures of the "Glazing Manual, 1986 Edition" (Flat Glass Marketing
Association).
B. American National Standard Institute (ANSI) Z97.1.
1. Each piece of safety glass shall exhibit appropriate label.
C. Consumer Product Safety Commission (CPSC), "Safety Standards for Architectural
Glazing Materials".
1.3 DELIVERY, STORAGE AND HANDLING
A. Deliver glazing materials to Project site in manufacturer's unopened containers, fully
identified with trade name, color, size, hardness, type, class, and grade. Store each item
in accordance with manufacturer's instructions. Damaged and otherwise unsuitable
material, when so determined, shall be immediately removed from the Project site.
1.4 PROJECT CONDITIONS
A. Maintain a minimum temperature of 40 degrees F. during glazing unless the
manufacturer of the glazing materials specifically agrees to installation of specified
materials at lower temperatures. If job progress and other conditions require glazing work
when temperatures are below 40 degrees F. (or below the minimum temperature
recommended by the manufacturer), consult the manufacturer and establish the
minimum provisions required to ensure satisfactory work. Record in writing to the
manufacturer, with copy to the Owner's Construction Manager, the conditions under
which such glazing work proceeds, and the provisions made to ensure satisfactory work.
1.6 PERFORMANCE REQUIREMENTS
A. General: Provide glazing systems capable of withstanding normal thermal movement
and wind and impact loads (where applicable) without failure, including loss or glass
breakage attributable to the following: defective manufacture, fabrication, and
installation; failure of sealants or gaskets to remain watertight and airtight; deterioration of
glazing materials; or other defects in construction.
B. Exterior Wind and Impact Loading: Provide exterior glass to withstand wind loading
pressures in accordance with the following
C. Glass Design: Glass thickness designations indicated are minimums and are for
detailing only. Confirm glass thicknesses by analyzing Project loads and in-service
conditions. Provide glass lites in the thickness designations indicated for various size
openings, but not less than thicknesses and in strengths (annealed or heat treated)
required to meet or exceed the following criteria:
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1. Glass Thicknesses: Select minimum glass thicknesses to comply with ASTM E
1300, according to the following requirements:
a. Design Wind Loads: Determine design wind loads applicable to Project from
basic wind speed indicated in miles per hour at 33 feet above grade, according to
ASCE 7, "Minimum Design Loads for Buildings and Other Structures": Section
6.5, "Method 2-Analytical Procedure," based on mean roof heights above grade
indicated on Drawings.
b. Probability of Breakage for Vertical Glazing: 8 lites per 1000 for lites set
vertically or not more than 15 degrees off vertical and under wind action.
1) Load Duration: 60 seconds or less.
c. Maximum Lateral Deflection: For the following types of glass supported on all 4
edges, provide thickness required that limits center deflection at design wind
pressure to 1/50 times the short side length or 1 inch, whichever is less.
1) For insulating glass.
d. In areas required to meet hurricane exterior wind and impact loading
requirements, provide exterior glass to withstand wind loading pressures in
accordance with the following:
1) Provide products meeting the design pressure requirements indicated in the
wind tunnel study, RWDI 06-1081.
2) Provide products having a current Dade County (Florida) Notice of
Acceptance (NOA).
D. Thermal Movements: Provide glazing that allows for thermal movements resulting
from the following maximum change (range) in ambient and surface temperatures
acting on glass framing members and glazing components. Base engineering
calculation on surface temperatures of materials due to both solar heat gain and
nighttime -sky heat loss.
1. Temperature Change (Range): 120 deg F, ambient; 180 deg F, material
surfaces.
E. Thermal and Optical Performance Properties: Provide glass with performance
properties specified based on manufacturer's published test data, as determined
according to procedures indicated below:
1. For insulating -glass units, properties are based on units of thickness indicated for
overall unit and for each lite.
2. Center -of -Glass Values: Based on using LBL-44789 WINDOW 5.0 computer
program for the following methodologies:
a. U-Factors: NFRC 100 expressed as Btu/ sq. ft. x h x deg F.
b. Solar Heat Gain Coefficient: NFRC 200.
c. Solar Optical Properties: NFRC 300.
1.9 WARRANTY
A. Manufacturer's Special Warranty on Insulating Glass: Manufacturer's standard form,
made out to Owner and signed by insulating -glass manufacturer agreeing to replace
insulating -glass units that deteriorate as defined in "Definitions" Article, f.o.b. the nearest
shipping point to Project site, within specified warranty period indicated below.
1. Warranty Period: 10-years from date of Substantial Completion.
PART PRODUCTS
2.0 ACCEPTABLE MANUFACTURERS
A. Primary Glass Products and Insulated Units:
1. CardinallG
2. Falconer Glass Industries, Inc.
3. Ford Motor Co., Glass Div.
4. Guardian Industries, Corp.
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5. Libbey-Owens-Ford Co.
6. PPG Industries, Inc. Glass Group
7. Viracon, Inc.
8. Tempglass, Inc.
B. Other Materials -As specified in Article 2.02.
2.1 MATERIALS
A. Clear Float Glass: ASTM C1036 Type 1, Class 1 Quality q3, 1/4" thick clear.
B. Colored Plate Glass: ASTM C1036, 1/4" thick, graylite #14.
C. Tempered Float Glass: Float glass which has been heat strengthened (fully tempered) to
achieve strength 4 to 5 times stronger than regular annealed glass, complying with ASTM
C1048 and ANSI-Z97.1. Glass shall be tempered horizontally. (Tong marks at top only
will be permitted).
D. Insulating Glass: 1" insulating glass complying with ASTM E774 a tested and approved
in accordance with SIGMA, Sealed Insulating Glass Manufacturers Association
requirements. Provide following where shown:
1. Type A: 1/4" clear glass outboard, 1 1/2" air space and 1/4"clear glass inboard.
a. Temper both panes where shown on Drawings and/or as required.
E. GLAZING GASKETS
1. Dense Compression Gaskets: Molded or extruded gaskets of material indicated
below, complying with standards referenced with name of elastomer indicated below,
and of profile and hardness required to maintain watertight seal:
a. Neoprene, ASTM C 864.
b. EPDM, ASTM C 864.
c. Thermoplastic polyolefin rubber, ASTM C 1115.
d. Any material indicated above.
2. Soft Compression Gaskets: Extruded or molded, closed -cell, integral -skinned
gaskets of material indicated below; complying with ASTM C 509, Type II, black; and
of profile and hardness required to maintain watertight seal:
a. Neoprene.
b. EPDM.
c. Thermoplastic polyolefin rubber.
d. Any material indicated above.
F. GLAZING SEALANTS
1. General: Provide products of type indicated, complying with the following
requirements:
a. Compatibility: Select glazing sealants that are compatible with one another and
with other materials they will contact, including glass products, seals of
insulating -glass units, and glazing channel substrates, under conditions of
service and application, as demonstrated by sealant manufacturer based on
testing and field experience.
b. Suitability: Comply with sealant and glass manufacturers' written instructions for
selecting glazing sealants suitable for applications indicated and for conditions
existing at time of installation.
c. VOC Content: For sealants used inside of the weatherproofing system, not more
than 250 g/L when calculated according to 40 CFR 59, Subpart D (EPA Method
24).
d. Colors of Exposed Glazing Sealants: As selected by Architect from
manufacturer's full range.
2. Elastomeric Glazing Sealants: Comply with ASTM C 920 and other requirements
indicated for each liquid -applied chemically curing sealant specified, including those
referencing ASTM C 920 classifications for type, grade, class, and uses related to
exposure and joint substrates.
a. Single -Component Neutral and Basic Curing Silicone Glazing Sealants:
1) Products:
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2) Dow Corning Corporation; 790.
3) GE Silicones; SilPruf LM SCS2700.
4) Tremco; Spectrem 1 (Basic).
5) Sonneborn, Div. of ChemRex, Inc.; Omniseal.
b. Type and Grade: S (single component) and NS (non -sag).
c. Class: 50.
d. Use Related to Exposure: NT (non -traffic).
e. Uses Related to Glazing Substrates: M, G, A, and, as applicable to
glazing substrates indicated, O.
1) Use O Glazing Substrates: Anodic aluminum.
G. GLAZING TAPES
1. Back -Bedding Mastic Glazing Tapes: Preformed, butyl -based elastomerc tape with
a solids content of 100 percent; non -staining and non -migrating in contact with
nonporous surfaces; with or without spacer rod as recommended in writing by tape
and glass manufacturers for application indicated; packaged on rolls with a release
paper backing; and complying with ASTM C 1281 and AAMA 800 for products
indicated below:
a. AAMA 806.3 tape, for glazing applications in which tape is subject to continuous
pressure.
b. AAMA 807.3 tape, for glazing applications in which tape is not subject to
continuous pressure.
2. Expanded Cellular Glazing Tapes: Closed -cell, PVC foam tapes; factory coated with
adhesive on both surfaces; packaged on rolls with release liner protecting adhesive;
and complying with AAMA 800 for the following types:
a. Type 1, for glazing applications in which tape acts as the primary sealant.
b. Type 2, for glazing applications in which tape is used in combination with a full
bead of liquid sealant.
H. MISCELLANEOUS GLAZING MATERIALS
1. General: Provide products of material, size, and shape complying with referenced
glazing standard, requirements of manufacturers of glass and other glazing materials
for application indicated, and with a proven record of compatibility with surfaces
contacted in installation.
2. Cleaners, Primers, and Sealers: Types recommended by sealant or gasket
manufacturer.
3. Setting Blocks: Elastomeric material with a Shore, Type A durometer hardness of
85, plus or minus 5.
4. Spacers: Elastomeric blocks or continuous extrusions with a Shore, Type A
durometer hardness required by glass manufacturer to maintain glass lites in place
for installation indicated.
5. Edge Blocks: Elastomeric material of hardness needed to limit glass lateral
movement (side walking).
6. Cleaners: Type recommended by gasket manufacturer.
PART 3 EXECUTION
3.0 EXAMINATION
A. Examine the framing and glazing channel surfaces, backing, removable stop design, and
the conditions under which the glazing is to be performed, and notify the Contractor in
writing of conditions detrimental to the proper and timely completion of the work. Do not
proceed with the glazing until unsatisfactory conditions have been corrected.
3.1 PREPARATION
A. Measure openings and cut glass accurately to fit each opening with minimum edge
clearances and bite on glass as specified by FGMA. If glass is to be cut to size at Project
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site, deliver each piece to Project at least 2" larger (in both dimensions) than required, to
facilitate the cutting of clean-cut edges without the necessity of seaming and nipping.
1. Do not attempt to cut, seam, nip, and abrade glass which is tempered, heat
strengthened, and coated.
B. Clean glazing stops and rabbets to receive glazing materials of obstructions and
deleterious substances which might impair the work.
3.2 INSTALLATION
A. PREPARATION
1. Clean glazing channels and other framing members receiving glass immediately
before glazing. Remove coatings not firmly bonded to substrates.
B GLAZING, GENERAL
1. Comply with combined written instructions of manufacturers of glass, sealants,
gaskets, and other glazing materials, unless more stringent requirements are
indicated, including those in referenced glazing publications.
2. Glazing channel dimensions, as indicated on Drawings, provide necessary bite on
glass, minimum edge and face clearances, and adequate sealant thicknesses, with
reasonable tolerances. Adjust as required by Project conditions during installation.
3. Protect glass edges from damage during handling and installation. Remove
damaged glass from Project site and legally dispose of off Project site. Damaged
glass is glass with edge damage or other imperfections that, when installed, could
weaken glass and impair performance and appearance.
4. Apply primers to joint surfaces where required for adhesion of sealants, as
determined by preconstruction sealant -substrate testing.
5. Install setting blocks in sill rabbets, sized and located to comply with referenced
glazing publications, unless otherwise required by glass manufacturer. Set blocks in
thin course of compatible sealant suitable for heel bead.
6. Do not exceed edge pressures stipulated by glass manufacturers for installing glass
lites.
7. Provide spacers for glass lites where length plus width is larger than 50 inches as
follows:
a. Locate spacers directly opposite each other on both inside and outside faces of
glass. Install correct size and spacing to preserve required face clearances,
unless gaskets and glazing tapes are used that have demonstrated ability to
maintain required face clearances and to comply with system performance
requirements.
b. Provide 1/8-inch minimum bite of spacers on glass and use thickness equal to
sealant width. With glazing tape, use thickness slightly less than final
compressed thickness of tape.
8. Provide edge blocking where indicated or needed to prevent glass lites from moving
sideways in glazing channel, as recommended in writing by glass manufacturer and
according to requirements in referenced glazing publications.
9. Set glass lites in each series with uniform pattern, draw, bow, and similar
characteristics.
10. Where wedge-shaped gaskets are driven into one side of channel to pressurize
sealant or gasket on opposite side, provide adequate anchorage so gasket cannot
walk out when installation is subjected to movement.
11. Square cut wedge-shaped gaskets at corners and install gaskets in a manner and
butt joints with sealant recommended by gasket manufacturer.
C. TAPE GLAZING
1. Position tapes on fixed stops so that, when compressed by glass, their exposed
edges are flush with or protrude slightly above sightline of stops.
2. Install tapes continuously, but not necessarily in one continuous length. Do not
stretch tapes to make them fit opening.
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3. Cover vertical framing joints by applying tapes to heads and sills first and then to
jambs. Cover horizontal framing joints by applying tapes to jambs and then to heads
and sills.
4. Place joints in tapes at corners of opening with adjoining lengths butted together, not
lapped. Seal joints in tapes with compatible sealant approved by tape manufacturer.
5. Do not remove release paper from tape until just before each glazing unit is installed.
6. Apply heel bead of elastomeric sealant.
7. Center glass lites in openings on setting blocks and press firmly against tape by
inserting dense compression gaskets formed and installed to lock in place against
faces of removable stops. Start gasket applications at corners and work toward
centers of openings.
8. Apply cap bead of elastomeric sealant over exposed edge of tape.
D. GASKET GLAZING (DRY)
1. Fabricate compression gaskets in lengths recommended by gasket manufacturer to
fit openings exactly, with allowance for stretch during installation.
2. Insert soft compression gasket between glass and frame or fixed stop so it is
securely in place with joints miter cut and bonded together at corners.
3. Center glass lites in openings on setting blocks and press firmly against soft
compression gasket by inserting dense compression gaskets formed and installed to
lock in place against faces of removable stops. Start gasket applications at corners
and work toward centers of openings. Compress gaskets to produce a weathertight
seal without developing bending stresses in glass. Seal gasket joints with sealant
recommended by gasket manufacturer.
4. Install gaskets so they protrude past face of glazing stops.
E. SEALANT GLAZING (WET)
1. Install continuous spacers, or spacers combined with cylindrical sealant backing,
between glass lites and glazing stops to maintain glass face clearances and to
prevent sealant from extruding into glass channel and blocking weep systems until
sealants cure. Secure spacers or spacers and backings in place and in position to
control depth of installed sealant relative to edge clearance for optimum sealant
performance.
2. Force sealants into glazing channels to eliminate voids and to ensure complete
wetting or bond of sealant to glass and channel surfaces.
3. Tool exposed surfaces of sealants to provide a substantial wash away from glass.
F. LOCK -STRIP GASKET GLAZING
A. Comply with ASTM C 716 and gasket manufacturer's written instructions. Provide
supplementary wet seal and weep system, unless otherwise indicated.
3.3 ADJUSTING AND CLEANING
A. Protect glass from breakage immediately upon installation. Use streamers or ribbons
suitably attached to framing and held free of the glass. Warning markings shall not be
applied directly to the glass.
B. Remove and replace glass which is broken, cracked, chipped, or damaged in any way
and from any source, including vandalism and accidents during the construction period.
C. Maintain glass in a reasonably clean condition during construction so that it will not
become stained.
D. Wash and polish glass on all faces just prior to final acceptance. Comply with instructions
and recommendations of the glass manufacturer for cleaning.
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