Roof Enclosure For Shaft Wall

Head of wall firestop system elastomeric spray firestop.

Roof enclosure for shaft wall.

Shaft enclosures are specifi cally addressed in ibc section 713. Stairwall systems are designed to enclose stairwalls this system is finished on both sides with a single layer of 1 2 fire code board. Walls above the roof deck are per the building construction type for exterior walls ch6 14 15 and ch7 section 704. Usg shaft wall systems installed horizontally provide economical construction for fire resistive duct enclosures corridors ceilings and stairway soffits.

However because shaft enclosure walls are to be constructed as fi re barriers per section 713 2 many shaft wall require ments directly reference provisions of fi re barriers found in section 707. Fire dampers are not required at penetrations of shafts where. Fire barriers do not extend above the roof deck. Shaft enclosures that are permitted to be penetrated by ducts and air transfer openings shall be protected with approved fire and smoke dampers installed in accordance with their listing.

However because shaft enclosure walls are to be constructed as fire barriers per section 713 2 many shaft wall requirements directly reference provisions on fire barriers found in section 707. Openings in exterior walls are per table 704 8. Usg cavity shaft wall can be used in elevator and mechanical shafts air ducts stairwells and areas where wall construction is only available from one side. In addition usg cavity shaft wall can be used to provide horizontal protection for corridor ceilings underside of stairwells and other applications.

Sw 104 1 hour shaftwall to steel deck. 1 hour corridor ceiling assembly with single layer 5 8 gypsum panels. Shaftwall system consists of 1 shaftliner panels supported by 2 1 2 4 or 6 c t studs and faced on one side with two layers of 1 2 fire code board. Shaft enclosures are specifically addressed in section 713 of the 2015 international building code ibc.

Shaft enclosure for hvac ductwork and roof drain pipes extends from ground floor slab up through the roof of a 2 story building. Above the roof the shaft enclosure is a penthouse with walls to about 30 inches above the roof and then 48 inch high louvers up to the roof of the shaft penthouse. Below the roof the shaft enclosure has a 2 hour rating.