DSLBD Office Fit Out - Broughton Construction Company

B. Acoustical Ceiling Units:
1. Armstrong World Industries, Inc.
2. Celotex Corp.
3. USG Interiors
PART 3 - EXECUTION
3.01 EXAMINATION
A. Verification of Conditions:
1. Examine areas and conditions under which acoustical ceiling work is to be performed. Verify that
layout of hangers will not interfere with other work.
2. Correct conditions detrimental to timely and proper execution of Work.
3. Do not proceed until unsatisfactory conditions have been corrected. Beginning of installation
means acceptance of existing conditions.
3.02 INSTALLATION
A. General Requirements:
1. Install system in accordance with manufacturer's instructions, and as supplemented in this section.
2. Install ceiling system in a true, even plane and in straight courses as indicated on Drawings.
3. Coordinate and fit ceiling components to grilles, lighting fixtures, and other related items. In
determining location and spacing of hangers and primary runners, take into consideration weight of
grilles, light fixtures, etc., that are to be installed in conjunction with acoustical ceilings.
4. Provide stabilizer bars, clips, splices, and edge mouldings required for a complete installation.
B. Suspension System:
1. Hang system independent of walls, columns, ducts, pipes and conduit. Where carrying members
are spliced, avoid visible displacement of face plane of adjacent members.
2. Where ducts or other equipment prevent regular spacing of hangers, reinforce nearest affected
hangers and related carrying channels to span extra distance.
3. Locate system on room axis leaving equal border units.
4. Do not support components on main runners or cross runners if weight causes total dead load to
exceed maximum deflection limitations. Support fixture loads by supplementary hangers located
within 6" of each corner; or support components independently.
5. Do not eccentrically load system, or produce rotation of runners.
6. Install wall moldings at intersection of suspended ceiling and vertical surfaces, using longest
practical lengths. Provide moldings at junctions with other interruptions. Miter corners where wall
moldings intersect, or install corner caps.
C. Acoustical Ceiling Units:
1. Fit acoustical units in place, free from damaged edges or other defects detrimental to appearance
and function.
2. Install acoustical units level, in uniform plane, and free from twist, warp and dents.
3. For tegular or reveal edged units, cut a reveal or rabbet edges of ceiling units at borders and
vertical surfaces.
4. Lay directional patterned units in basket weave pattern. Fit border neatly against abutting surfaces.
D. Tolerances:
1. Deflection of grid components shall not exceed 1/360 of span.
2. Variation from Flat and Level Surface: 1/8" in 10 feet maximum
3. Variation from Plumb of Grid Members: 2° maximum; caused by eccentric loads
END OF SECTION 09 51 00
ACOUSTICAL CEILINGS 09510-2