Fire Rated Roof Eaves

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.

Fire rated roof eaves.

A one inch 2 54 centimeter layer of stucco can easily lend a 1 hour fire rating to a wall source. 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. Many of our eaves use a drop in style with wings that can be adjusted to your material and cut out size and are horizontally oriented. If noncombustible materials fiber cement panel stucco were used as the sheathing it could also comply.

For more information on eave construction or other fire code requirements please refer to the county s wildland urban interface summary document pds 664 or contact the county s building department fire services division at 858 565 5920. Use flat horizontal soffits see figure 3 instead of attaching the soffits to the sloped joists which creates sloped soffits. Everything you wanted to know about fire rated construction but were afraid to ask. Eaves are the overhanging ledges of a roof and are usually diagonal.

Roof eaves overhangs are a fire hazard but they can be protected with an encasement of fire resistant material. Flame ember resistant vents naturally provide less airflow than regular unprotected vents and brandguard vent airflow ratings nfva are approximately 30 that of the same size standard 1 4 screened vent and are listed within each products description. Eaves without suffixes or with rt are for rafter and truss installation where spacing is commonly imprecise. Where when and how to determine if you need it.

Stucco is often recommended as one of the best materials for boxing in hazardous eaves.