1 Hour Fire Rated Roof Overhang

Overhangs one hour fire resistance rating.

1 hour fire rated roof overhang.

Wood joists wood i joists floor trusses and flat or pitched roof trusses spaced a maximum 24 o c. Use flat horizontal soffits see figure 3 instead of attaching the soffits to the sloped joists which creates sloped soffits. Where when and how to determine if you need it. 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.

With 1 2 wood structural panels with. Fire resistance rated 1 hour on the underside. Fm calls their acceptable risk systems class 1 while ul calls theirs classified insulated metal deck constructions. 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.

Ul and fm list many roof ceiling systems in their. Roof eave fire resistance rating shall be permitted to be reduced to 0 hours on the underside of the. 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. Use flat horizontal soffits see figure 3 instead of attaching the soffits to the sloped joists which creates sloped soffits.

Ibc table 721 3 item 21 1 1 describes a single prescriptive 1 hour rated floor or roof assembly that includes wood trusses. Is required on the underside or. Time temperature ratings the third major roof system fire test is astm e 119. Everything you wanted to know about fire rated construction but were afraid to ask.