5 inch drywall duct penetration
through-penetrating items such as electrical conduit, cable .. A. Studs — Wall framing shall consist of min /8 in. wide steel channel studs spaced max 24 in.
16 Aug 5. On the exterior (non-secure side), install one layer of 5/8 inch drywall, . Ducts over 96 square inches that penetrate the SCIF perimeter wall.
Using Gypsum Board for Walls and Ceilings Section VII
Ducts in the garage and ducts penetrating the walls or ceilings separating the dwelling from the . 5/8 inch type X drywall on all sides and back of cavity. Joints.
Section VII – Special Construction
Description:Items specified that help achieve higher performance include framing techniques, positioning of boards, spacing and selection of fasteners, caulking, and taping and finishing of joints. Because sound can travel over, under, or around walls, through windows and doors adjacent to them, through air ducts and through floors and crawlspaces below, these flanking paths must be correctly treated to reduce the transmission of sound. Hairline cracks and small holes permit the transmission of sound that can reduce the acoustical performance of an assembly, adversely affecting the Sound Transmission Class STC , particularly in higher rated assemblies. Failure to properly follow special construction and design details can ruin the effectiveness of the best assembly. To improve sound isolation: Avoid installing medicine cabinets, electrical, telephone, television and inter-com outlets, plumbing, heating and air conditioning ducts back to back.
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