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.

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. Overhangs one hour fire resistance rating. 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.

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. With 1 2 wood structural panels with. Fire resistance rated 1 hour on the underside.

Time temperature ratings the third major roof system fire test is astm e 119. 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. Ibc table 721 3 item 21 1 1 describes a single prescriptive 1 hour rated floor or roof assembly that includes wood trusses. This is a system test that includes structural members such as beams trusses and roof deck.

Where when and how to determine if you need it. A b 2 feet to 5 feet not fire resistance rated 0 hours 5 feet. Is required on the underside or. Use flat horizontal soffits see figure 3 instead of attaching the soffits to the sloped joists which creates sloped soffits.