Fire Rated Roof Eaves

Roof eaves overhangs are a fire hazard but they can be protected with an encasement of fire resistant material.

Fire rated roof eaves.

If exterior rated fire retardant products were used in the assembly plywood sheathing 2x rafter tails and blocking the assembly would comply because ignition resistant materials were used. 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. Use flat horizontal soffits see figure 3 instead of attaching the soffits to the sloped joists which creates sloped soffits. Eaves without suffixes or with rt are for rafter and truss installation where spacing is commonly imprecise.

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. Everything you wanted to know about fire rated construction but were afraid to ask. Under eave soffit vents important airflow notes. A one inch 2 54 centimeter layer of stucco can easily lend a 1 hour fire rating to a wall source.

Eaves are the overhanging ledges of a roof and are usually diagonal. 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. 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. If noncombustible materials fiber cement panel stucco were used as the sheathing it could also comply.

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.