092900Proj. No. 10105 Residence Conversions October 7, 2011
58 Kensington, 57 Dryads Green, 72 Dryads Green
Smith College, Northampton, MA
GYPSUM BOARD Page 1 of 8 092900
SECTION 092900 -GYPSUM BOARD
PART 1 -GENERAL
1.1 RELATED DOCUMENTS
A.Drawings and general provisions of the Contract, including General and
Supplementary Conditions and Division 01 Specification Sections, apply to this
Section.
1.2 SUMMARY
A.This Section includes the following:
1.Interior gypsum board.
2.Ceiling suspension systems for gypsum board substrates.
B.Related Sections include the following:
1.Division 06 Section "Rough Carpentry" for wood framing and furring that
supports gypsum board.
2.Division 07 Section "Thermal Insulation" for insulation and vapor
retarders installed in assemblies that incorporate gypsum board.
3.Division 09 painting Sections for primers applied to gypsum board
surfaces.
1.3 SUBMITTALS
A.Product Data: For each type of product indicated.
B.Samples: For the following products:
1.Trim Accessories: Full-size Sample in 12-inch-(300-mm-)long length
for each trim accessory indicated.
Proj. No. 10105 Residence Conversions October 7, 2011
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Smith College, Northampton, MA
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1.4 QUALITY ASSURANCE
A.Fire-Resistance-Rated Assemblies: For fire-resistance-rated assemblies,
provide materials and construction identical to those tested in assembly
indicated according to ASTM E 119 by an independent testing agency.
1.5 STORAGE AND HANDLING
A.Store materials inside under cover and keep them dry and protected against
damage from weather, condensation, direct sunlight, construction traffic, and
other causes. Stack panels flat to prevent sagging.
1.6 PROJECT CONDITIONS
A.Environmental Limitations: Comply with ASTM C 840 requirements or gypsum
board manufacturer's written recommendations, whichever are more stringent.
B.Do not install interior products until installation areas are enclosed and
conditioned.
C.Do not install panels that are wet, those that are moisture damaged, and those
that are mold damaged.
1.Indications that panels are wet or moisture damaged include, but are not
limited to, discoloration, sagging, or irregular shape.
2.Indications that panels are mold damaged include, but are not limited to,
fuzzy or splotchy surface contamination and discoloration.
PART 2 -PRODUCTS
2.1 PANELS, GENERAL
A.Size: Provide in maximum lengths and widths available that will minimize
joints in each area and that correspond with support system indicated.
Proj. No. 10105 Residence Conversions October 7, 2011
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Smith College, Northampton, MA
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2.2 INTERIOR GYPSUM BOARD
A.General: Complying with ASTM C 36/C 36M or ASTM C 1396/C 1396M, as
applicable to type of gypsum board indicated and whichever is more stringent.
1.Manufacturers: Subject to compliance with requirements, provide
products by one of the following:
a.American Gypsum Co.
b.G-P Gypsum.
c.Lafarge North America Inc.
d.National Gypsum Company.
e.USG Corporation.
B.Regular Type:
1.Thickness: 1/2 inch (12.7 mm).
2.Long Edges: Tapered.
C.Type X:
1.Thickness: 5/8 inch (15.9 mm).
2.Long Edges: Tapered.
D.Moisture-and Mold-Resistant Type: With moisture-and mold-resistant core
and surfaces.
1.Core: 1/2 inch (12.7mm); except 5/8 inch (15.9 mm), Type X for ceiling
applications.
2.Long Edges: Tapered.
2.3 SUSPENSION GRID
A.Manufacturers: Subject to compliance with requirements, provide products by
one of the following:
1.USG Corporation.
B.Heavy Duty system of hot dip galvanized cold formed steel main and cross-
tees designed with knurled 1 1/2 inch wide flanges.
Proj. No. 10105 Residence Conversions October 7, 2011
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Smith College, Northampton, MA
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C.Provide grid for fire rated assemblies where indicated.
2.4 TRIM ACCESSORIES
A.Interior Trim: ASTM C 1047.
1.Material: Galvanized or aluminum-coated steel sheet or rolled zinc.
2.Shapes:
a.Cornerbead.
b.LC-Bead: J-shaped; exposed long flange receives joint compound.
2.5 JOINT TREATMENT MATERIALS
A.General: Comply with ASTM C 475/C 475M.
B.Joint Tape:
1.Interior Gypsum Wallboard: Paper.
C.Joint Compound for Interior Gypsum Wallboard: For each coat use formulation
that is compatible with other compounds applied on previous or for successive
coats.
1.Prefilling: At open joints and damaged surface areas, use setting-type
taping compound.
2.Embedding and First Coat: For embedding tape and first coat on joints,
fasteners, and trim flanges, use compound.
a.Use setting-type compound for installing paper-faced metal trim
accessories.
3.Fill Coat: For second coat, use drying-type, all-purpose compound.
4.Finish Coat: For third coat, use drying-type, all-purpose compound.
2.6 AUXILIARY MATERIALS
A.General: Provide auxiliary materials that comply with referenced installation
standards and manufacturer's written recommendations.
Proj. No. 10105 Residence Conversions October 7, 2011
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B.Steel Drill Screws: ASTM C 1002, unless otherwise indicated.
1.Use screws complying with ASTM C 954 for fastening panels to steel
members from 0.033 to 0.112 inch (0.84 to 2.84 mm)thick.
C.Acoustical Sealant: As specified in Division 07 Section "Joint Sealants."
D.Thermal Insulation: As specified in Division 07 Section "Thermal Insulation."
PART 3 -EXECUTION
3.1 EXAMINATION
A.Examine areas and substrates, with Installer present, and including welded
hollow-metal frames and framing, for compliance with requirements and other
conditions affecting performance.
B.Examine panels before installation. Reject panels that are wet, moisture
damaged, and mold damaged.
C.Proceed with installation only after unsatisfactory conditions have been
corrected.
3.2 APPLYING AND FINISHING PANELS, GENERAL
A.Comply with ASTM C 840.
B.Install ceiling panels across framing to minimize the number of abutting end
joints and to avoid abutting end joints in central area of each ceiling. Stagger
abutting end joints of adjacent panels not less than one framing member.
C.Install panels with face side out. Butt panels together for a light contact at
edges and ends with not more than 1/16 inch (1.5 mm)of open space between
panels. Do not force into place.
D.Locate edge and end joints over supports, except in ceiling applications where
intermediate supports or gypsum board back-blocking is provided behind end
joints. Do not place tapered edges against cut edges or ends. Stagger vertical
Proj. No. 10105 Residence Conversions October 7, 2011
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Smith College, Northampton, MA
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joints on opposite sides of partitions. Do not make joints other than control
joints at corners of framed openings.
E.Cover both faces of support framing with gypsum panels in concealed spaces
(above ceilings, etc.), except in chases braced internally.
1.Fit gypsum panels around ducts, pipes, and conduits.
2.Where partitions intersect structural members projecting below underside
of floor/roof slabs and decks, cut gypsum panels to fit profile formed by
structural members; allow 1/4-to 3/8-inch-(6.4-to 9.5-mm-)wide
joints to install sealant.
F.Wood Framing: Install gypsum panels over wood framing, with floating
internal corner construction. Do not attach gypsum panels across the flat
grain of wide-dimension lumber, including floor joists and headers. Float
gypsum panels over these members, or provide control joints to counteract
wood shrinkage.
3.3 APPLYING INTERIOR GYPSUM BOARD
A.Install interior gypsum board in the following locations:
1.Regular Type: Typical, except as follows:
2.Type X: Where required for fire-resistance-rated assembly.
3.Moisture-and Mold-Resistant Type: Bathrooms.
B.Single-Layer Application:
1.On ceilings, apply gypsum panels before wall/partition board application
to greatest extent possible and at right angles to framing, unless
otherwise indicated.
2.On partitions/walls, apply gypsum panels horizontally (perpendicular to
framing), unless otherwise indicated or required by fire-resistance-rated
assembly, and minimize end joints.
a.Stagger abutting end joints not less than one framing member in
alternate courses of panels.
b.At stairwells and other high walls, install panels horizontally, unless
otherwise indicated or required by fire-resistance-rated assembly.
Proj. No. 10105 Residence Conversions October 7, 2011
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3.Fastening Methods: Apply gypsum panels to supports with steel drill
screws.
3.4 INSTALLING TRIM ACCESSORIES
A.General: For trim with back flanges intended for fasteners, attach to framing
with same fasteners used for panels. Otherwise, attach trim according to
manufacturer's written instructions.
B.Interior Trim: Install in the following locations:
1.Cornerbead: Use at outside corners.
2.LC-Bead: Use at exposed panel edges and where panels abut dissimilar
materials.
3.5 FINISHING GYPSUM BOARD
A.General: Treat gypsum board joints, interior angles, edge trim, control joints,
penetrations, fastener heads, surface defects, and elsewhere as required to
prepare gypsum board surfaces for decoration. Promptly remove residual joint
compound from adjacent surfaces.
B.Prefill open joints and damaged surface areas.
C.Apply joint tape over gypsum board joints, except those with trim having
flanges not intended for tape.
D.Gypsum Board Finish Levels: Finish panels to levels indicated below and
according to ASTM C 840:
1.Level 4: At panel surfaces that will be exposed to view, unless otherwise
indicated.
a.Primer and its application to surfaces are specified in other
Division 09 Sections.
Proj. No. 10105 Residence Conversions October 7, 2011
58 Kensington, 57 Dryads Green, 72 Dryads Green
Smith College, Northampton, MA
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3.6 PROTECTION
A.Protect installed products from damage from weather, condensation, direct
sunlight, construction, and other causes during remainder of the construction
period.
B.Remove and replace panels that are wet, moisture damaged, and mold
damaged.
1.Indications that panels are wet or moisture damaged include, but are not
limited to, discoloration, sagging, or irregular shape.
2.Indications that panels are mold damaged include, but are not limited to,
fuzzy or splotchy surface contamination and discoloration.
END OF SECTION 092900