1 Hour Fire Rated Roof Overhang

Fm calls their acceptable risk systems class 1 while ul calls theirs classified insulated metal deck constructions.

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. 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.

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. Everything you wanted to know about fire rated construction but were afraid to ask. Ul and fm list many roof ceiling systems in their.

A b 2 feet to 5 feet not fire resistance rated 0 hours 5 feet. 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. With 1 2 wood structural panels with.

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. Fire resistance rated 1 hour on the underside. Time temperature ratings the third major roof system fire test is astm e 119.