Shaft wall duct penetration isolation

Cover square-edge gypsum sheathing applied with its bound edge perpendicular to the framing with a water-resistive barrier or seal horizontal joints. Gypsum base is usually 48 inches wide and available in 8 foot, 10 foot, and 12 foot lengths. Fire-resistance-rated glazing, when tested in accordance with ASTM E or UL and complying with the requirements of Section , shall be permitted. Fire walls shall be designed and constructed to allow collapse of the structure on either side without collapse of the wall under fire conditions. Where the penetrating items are steel, ferrous or copper pipes, tubes or conduits, the annular space between the penetrating item and the fire-resistance-rated wall is permitted to be protected as follows: Except where the building is equipped throughout with an automatic sprinkler and the fire-rated glazing meets the criteria established in Section
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Section VII – Special Construction

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Improving Firestopping for HVAC Duct Penetrations in Fire-Rated Walls

Smoke-barrier walls are not required in interstitial spaces where such spaces are designed and constructed with ceilings or exterior walls that provide resistance to the passage of fire and smoke equivalent to that provided by the smoke-barrier walls. Where the wall faces a street and has a fire separation distance of more than 15 feet mm ; or 1. First, it provides the greatest degree of fire protection. Set time is especially critical in machine application because the machine accelerates the setting process of the plaster. Apply the roof membrane as specified by the manufacturer. This is good from a fire-resistance perspective, as steel is inherently fire resistant.
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USG Design Studio | Shaft Wall - Duct Enclosure - Download Details

Position steel studs on opposite sides of chase directly across from each other with flanges facing in the same direction. So if the space between the duct and the opening is 1 inch, a 2- x 2-inch angle would be required. Mix a small batch of base coat gypsum veneer plaster and spot fill any deep holes and crevices first. The instructions shall include, but are not limited to, substrate temperatures and surface conditions and SFRM handling , storage, mixing, conveyance, method of application, curing and ventilation. Others have no facings and flanges. Ducts that penetrate horizontal assemblies not required to be contained within a shaft and not required by this section to have dampers shall comply with the requirements of Sections Other designs may use foam backer rod or glass fiber as a form to facilitate installation of the sealant along a long span.
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Where the roof slopes toward a parapet at a slope greater than two units vertical in 12 units horizontal Locate all gypsum board ends on the roof framing members. For the purposes of determining the required wall and opening protection, projections and roof-covering requirements, buildings on the same lot shall be assumed to have an imaginary line between them. Provide suitable fascias and moldings around the perimeter to protect the board from direct exposure to water. Unprotected openings shall be permitted for corridors in multitheater complexes where each motion picture auditorium has at least one-half of its required exit or exit access doorways opening directly to the exterior or into an exit passageway.
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