Complete Compiled Specification.pdf - Peck Ormsby Construction

1. Comply with installation instructions of U.S.G. installation handbook, latest edition.
2. Install additional stud and jambs of openings.
3. Install deflection tracks where studs are continuous to roof deck.
C. Gypsum Board:
1. Apply boards with long dimension perpendicular to framing members with all abutting
ends and edges over supports. Neatly fit and stagger all end joints. Make joints occur
on different studs at opposite sides of partition. Cut and fit neatly around all outlets
and switches. Space fasteners 8" o.c. along vertical edges and 12" o.c. at midpoints,
3/8" from edge of board. Fasten boards to backings specified.
2. Erection techniques shall result in plumb and straight surfaces with no waves or
buckles, free or unevenness at joints.
3. Joints shall be in continuous moderate contact.
4. If framing members are out of alignment, bowed or warped, correct to make true
surfaces before application of gypsum board. Use method of correction approved by
the Architect. Make finished walls or ceilings plumb and level without ridges, bows, or
warps.
5. Execute wallboard work when building temperature is within a range of 55 degrees to
90 degrees F. Ventilate to eliminate excessive moisture.
D. Fiberglass-Mat Faced Gypsum Backing Board:
1. General: In accordance with ASTM C840 and the manufacturer’s recommendations.
Install at toilet room walls.
a. Install other accessories where required.
E. Finishing Gypsum Board Assemblies
1. General: Apply joint treatment at gypsum board joints (both directions); flanges of
corner beads, edge trim, and control joints; penetrations; fastener heads, surface
defects, and elsewhere as required to prepare gypsum board surfaces for decorations
and levels of gypsum board finish indicated.
2. Prefill open joints, rounded or beveled edges, and damaged areas using setting-type
joint compound.
3. Apply joint tape over gypsum board joints except those with trim accessories having
concealed face flanges not requiring taping to prevent cracks from developing in joint
treatment at flange edges.
4. Levels of Gypsum Board Finish: Provide the following levels of gypsum board finish
per GA-214.
5. For gypsum board surfaces exposed to view, provide level 4 gypsum board finish.
Embed tape in joint compound and apply three separate coats of joint compound over
joints, angles, fastener heads, and accessories. Touch up and sand between coats
and after last coat as needed to produce a surface free of visual defects and ready for
decoration. Use one of the following joint compound combinations:
a. Fill (Second) Coat: Job-mixed, drying-type topping compound.
b. Finish (Third) Coat: Job-mixed, drying-type topping compound.
c. Embedding and First Coat: Job-mixed, drying-type all-purpose compound.
d. Fill (Second) Coat: Job-mixed, drying-type all-pourpose compound.
e. Finish (Third) Coat: Job-mixed, drying-type all-purpose compound.
f. Embedding and First Coat: Setting-type compound.
g. Finish (Third) Coat: Job-mixed, drying-type all-purpose compound.
6. For gypsum board not exposed to view (above ceilings), provide a level 2 finish,
applying joint compound for an embedding coat and for a first coat.
7 Allow compound to thoroughly dry for at least 24 hours.
8. Gypsum Wallboard is to be a smooth non-textured finish.
9. Give all dimples at fastener heads and all marred spots on surface of board 1 coat
joint compound and 2 coats finishing compound, applied as each coat is applied.
SEGO LILY ELEMENTARY SCHOOL CLASSROOM ADDITION MARCH 2, 2009
GYPSUM BOARD ASSEMBLIES 09250-4