Fire Wall To Roof Detail

Wood framed including dimensional lumber engineered joist and truss.

Fire wall to roof detail.

The project has m and s2 occupancies with some of the s2 separated with a 2hr fire barrier wall. 34 openings part 1 joints within fire walls and between fire walls and other fire resistive construction such as floor or floor ceiling assemblies and roof or roof ceiling assemblies must be protected for a time period that is not less than the. In the event one wall is pulled down due to fire the other wall remains intact preventing fire spread. C roof ceilings45 51 steel framed including steel bar joist framing steel c joist framing steel truss and steel roof deck.

I was wondering what you might think about the required detail for a head of wall joint at a fire barrier wall in the following case. D horizontal membrane 52 shaft wall used in a horizontal plane. The exception is where the roof is of reinforced concrete construction and has a fire resistance of at least one hour for a two hour firewall or two hours for a four hour firewall. The roof insulation is continuously draped over the top of the wall.

The code is 2009 ibc. Openings are permitted in fire walls and are discussed in detail in the code corner no. The detail drawings are grouped by details and can be downloaded below in dwg or pdf format. Construction is type v b so there is no general requirement to rate the roof deck assembly.

Where the room side fire resistance rated membrane of the corridor is carried through to the underside of the floor or roof sheathing deck or slab of a fire resistance rated floor or roof above the ceiling of the corridor shall be permitted to be protected by the use of ceiling materials as required for a 1 hour fire resistance rated floor or roof system. It utilizes two independent concrete masonry walls side by side each meeting the required fire resistance rating. This is somewhat of a relaxation over traditional firewall construction as in theory the roof could collapse in over an hour leading to collapse of the firewall. This concern should now be alleviated.

6 1 typical party wall and roof applications roof details compliant battens and sarking over party wall sarking not shown for clarity compliant fire rated separating wall brick wall shown bradford fireseal party wall sealer compressed between roof tiles and top of party wall truss rafter line roof tiles figure 6 1 2. Fire walls building separation openings are protected and limited continuous from foundation to through roof and exterior wall to through exterior wall structural stability fire barrier shafts occupancy separation openings are protected and limited continuous from floor through concealed space at each level fire partition. The testing demonstrated that the fire will not travel to the wall s unexposed side via the vapor barrier. Floor and roof connections to each fire wall are the same as for conventional concrete masonry construction.

Some building officials had required this vapor barrier to be cut and re attached to each side of the wall.