1 Hour Fire Rated Roof Overhang

Everything you wanted to know about fire rated construction but were afraid to ask.

1 hour fire rated roof overhang.

Ul and fm list many roof ceiling systems in their. Enclose overhangs with soffits that have a minimum 1 hour fire resistance rating to prevent embers and hot gases from making contact with the joists rafters or trusses or the underside of the roof decking. Ibc table 721 3 item 21 1 1 describes a single prescriptive 1 hour rated floor or roof assembly that includes wood trusses. With 1 2 wood structural panels with.

A b 2 feet to 5 feet not fire resistance rated 0 hours 5 feet. Wood joists wood i joists floor trusses and flat or pitched roof trusses spaced a maximum 24 o c. Roof eave fire resistance rating shall be permitted to be reduced to 0 hours on the underside of the. He was told that the walls would need to have a fire resistive construction and also the eave overhang would need to be rated 1 hour as well because it encroaches into the setback.

Overhangs one hour fire resistance rating. Where when and how to determine if you need it. Time temperature ratings the third major roof system fire test is astm e 119. Is required on the underside or.

This is a system test that includes structural members such as beams trusses and roof deck. Fire resistance rated 1 hour on the underside. Use flat horizontal soffits see figure 3 instead of attaching the soffits to the sloped joists which creates sloped soffits. The detail he gave us one coat stucco sub shows 2 layers of type x screwed into the rafter tails 3 5 8 with lath and stucco over that.