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Part 1 - General
1.1 RELATED DOCUMENTS
A. Drawings and general
provisions of the Contract, including General and Supplementary
Conditions and Division 1 Specification Sections, apply
to this Section.
1.2 SUMMARY
A. This Section includes
the following:
1. Embedded glass-mat
gypsum sheathing board.
2. Sheathing joint-and-penetration
treatment.
1.3 DEFINITIONS
A. Gypsum Board Construction
Terminology Standard: Refer to ASTM C 11 for definitions
of terms for gypsum sheathing board construction not defined
in this Section or in other referenced standards.
1.4 SUBMITTALS
A. Submit in accordance
with Section 01330.
B. Product Data: For
each type of product indicated.
C. Informational Submittals:
Submit manufacturer's instructions, special procedures,
and perimeter conditions requiring special attention.
1.5 QUALITY ASSURANCE
A. Fire-Test-Response
Characteristics: For assemblies with fire-resistance ratings,
provide materials and construction identical to those of
assemblies tested for fire resistance per ASTM E 119 (UL
263, CAN/ULC-S101) by a testing and inspecting agency acceptable
to authorities having jurisdiction.
1. Fire-Resistance
Ratings: Indicated by design designations from UL's "Fire
Resistance Directory" and "Products Certified
for Canada."
B. Single Source Responsibility:
Except where specified otherwise, obtain gypsum board products,
joint treatment, and accessories from single manufacturer
or from manufacturers recommended by prime manufacturer
of gypsum board products.
1.6
DELIVERY, STORAGE, AND HANDLING
A. Store materials protected
against damage from weather, direct sunlight, surface contamination,
construction traffic, or other causes. Stack GlasRoc® Sheathing
flat on leveled supports off the ground, under cover, and
fully protected from weather.
1. Store and support GlasRoc® Sheathing
board in flat stacks to prevent sagging.
2. Protect materials
to keep them dry.
3. Protect gypsum
board panels to prevent damage to edges, ends, and surfaces.
1.7 COORDINATION
A. GlasRoc® Sheathing:
1. Sheathing Board:
Do not leave exposed to weather for more than 12 months.
1.8 WARRANTY
A. Manufacturer's standard
warranty for product exposed to weather without failure,
when installed in accordance with manufacturer's requirements,
for period of not less than 12 months.
Part 2 - Products
2.1 GYPSUM SHEATHING
A. GlasRoc® Sheathing:
Meets requirements of ASTM C 1177.
1. Acceptable Product:
Subject to compliance with requirements, provide the
following:
a. "GlasRoc® Sheathing" by
CertainTeed, Tampa, FL.
b. Substitutions:
Submit in accordance with Section 01600.
2. Type and Thickness:
Type X, 5/8 inch (15.9 mm) thick where indicated and
as otherwise required to meet fire rating for specific
element. [1/2 inch (12.7 mm) elsewhere.]
a. Flame spread:
ASTM E 84 (CAN/ULC-S102): 0 maximum.
b. Smoke developed:
ASTM E 84 (CAN/ULC-S102): 0 maximum.
3. Size: 48 by not
less than 96 inches (1219 by not less than 2438 mm);
longer lengths as available to reduce number of joints.
2.2 SHEATHING JOINT-AND-PENETRATION
TREATMENT MATERIALS
A. Silicone Sealant:
Meeting ASTM C 920, Type S, Grade NS, compatible with sheathing
tape and sheathing, recommended by tape and sheathing manufacturers
for use with glass-fiber mesh sheathing tape and for covering
exposed fasteners.
B. Glass-Fiber Mesh
Sheathing Tape: Self-adhering glass-fiber tape, minimum
2 inches (50 mm) wide, 10 by 10 or 10 by 20 threads/inch
(390 by 390 or 390 by 780 threads/m), of type recommended
by sheathing and tape manufacturers for use with silicone
emulsion sealant in sealing joints in glass-mat gypsum
sheathing board and with a history of successful in-service
use.
2.3 ACCESSORY MATERIALS
A. Fasteners: Steel
drill screws, in length recommended by sheathing manufacturer
for thickness of sheathing board to be attached, with organic-polymer
or other corrosion-protective coating having a saltspray
resistance of more than 800 hours according to ASTM B 117.
1. For steel framing
less than 0.0329 inch (0.835 mm) thick, attach sheathing
with steel drill screws complying with ASTM C 1002.
2. For steel framing
from 0.033 to 0.112 inch (0.84 to 2.84 mm) thick, attach
sheathing with drill screws complying with ASTM C 954.
3. For wood framing,
attach with nails or screws of type and spacing as recommended
by sheathing manufacturer.
Part 3 - Execution
3.1 GYPSUM
SHEATHING INSTALLATION
A. Comply with GA-253,
ASTM C 1280 and manufacturer's written instructions.
B. Install GlasRoc® Sheathing
with acrylic coated side (logo side) out. Boards are also
printed with "Install Other Side Out" on the
backside.
C. Cut boards at penetrations,
edges, and other obstructions of work; fit tightly against
abutting construction, unless otherwise indicated.
1. Install boards
with a 3/8-inch (10 mm) setback where non-load-bearing
construction abuts structural elements.
2. Install boards
with a 1/4-inch (6 mm) setback where they abut masonry
or similar materials that might retain moisture, to prevent
wicking.
3. Allow no joints
greater than 1/8 inch (3 mm)
D. Coordinate sheathing
installation with flashing and joint-sealant installation
so these materials are installed in sequence and manner
that prevents exterior moisture from passing through completed
exterior wall assembly.
E. Apply fasteners so
screw heads bear tightly against face of sheathing boards
but do not cut into facing.
F. Do not bridge building
expansion joints with sheathing; cut and space edges to
match spacing of structural support elements.
G. Horizontal Installation:
Install sheathing with long edges in contact with edges
of adjacent boards without forcing. Abut ends of boards
over centers of stud flanges, and stagger end joints of
adjacent boards not less than one stud spacing. Screw-attach
boards at perimeter and within field of board to each steel
stud.
1. Space fasteners
approximately 8 inches (200 mm) o.c. (or tighter spacing
if recommended by manufacturer for specific application)
and set back a minimum of 3/8 inch (10 mm) from edges
and ends of boards.
3.2 SHEATHING JOINT-AND-PENETRATION
TREATMENT
A. Seal sheathing joints
according to sheathing manufacturer's written recommendations.
1. Short Term (12 month
exposure) - Apply elastomeric sealant on joints and trowel
flat. Apply sufficient quantity of sealant to completely
cover joints after troweling. Seal other penetrations
and openings.
2. Long Term (as an
alternate to separate weather-resistive barrier) - Apply
glass-fiber mesh sheathing tape to fiberglass reinforced
gypsum sheathing board joints, and apply and trowel silicone
emulsion sealant to embed sealant in entire face of tape.
3. Apply sealant to
exposed fasteners with a trowel so fasteners are completely
covered. Seal other penetrations and openings.
B. Water-Resistive Barrier
1. Consult building
code authority having jurisdiction for requirements regarding
water-resistive barrier installation, if necessary.
3.3 CEILINGS AND SOFFITS
A. Finishing
is accomplished with one of the following methods:
1. Direct-Applied
Exterior Finish System (DEFS) is applied per the manufacturer’s
specifications.
2. Apply 2”x10x10
glass mesh drywall tape and setting-type joint compound
on the board joints. Skim coat the entire surface with
a setting-type compound, prime and paint with good quality
exterior grade primer and paint per the manufacturer’s
recommendations.
CAUTION: This
product contains continuous filament fiberglass. Fibers
may be released in the normal handling of this product
which can cause respiratory, minor skin and eye irritations.
Avoid contact with
eyes and skin.
Do not breathe
dust. Signs and symptoms of over-exposure include temporary
irritation of eyes, nose, throat and lungs. Aggravated
medical conditions may include respiratory illness, however
there are first aid procedures that can reduce risk of
illness. These include moving to area for fresh air in
the case of inhalation. If material irritates the eye,
flush with running water for 15 minutes. When contact with
skin occurs, wash gently with soap and water. However,
when used under normal circumstances, following installation
instructions, this product is not expected to present health
hazards. For more information, consult the GlasRoc® Material Safety Data Sheet by contacting CertainTeed at 800-233-8990
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