1 Hour Roof Over Hang Protection Detail

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.

1 hour roof over hang protection detail.

The ibc in section 705 2 3 permits the use of type iv construction fire retardant treated wood or 1 hr fire resistance construction for combustible projections. See attached image we are hoping to replicate this in the addition. Madesign history contact. 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.

The existing open eaves have t g sheathing with exposed rafter tails and 2x blocking b w rafters. To the centerline of a street an alley or public way. Hi all we need to provide one hour rated protection for under eaves on a residential property remodel. However a garage located within 2 of the property line is permitted to have a 4 inch roof eave projection.

Walls less than 5 feet from the property lot line must be of a listed hour fire1 resistant construction. Soffits a soffit encloses the underside of sloped or flat roof overhangs. The irc in table r302 1 1 only. Use flat horizontal soffits see figure 3 instead of attaching the soffits to the sloped joists which creates sloped soffits.

1 hour rated wall and protected eave overhang soffit board 1 2 cdx ply 2 x 4 block 2x framing 5 8 type x gypsum sheathing siding 5 8 type x gypsum wallboard structural sheathing as required fascia approved roof covering alternate location of gwb or 2x blocking if no ceiling finish is provided 1900 sw 4th avenue suite 5000 portland or 97201. Overhangs such as roof eaves and soffits are one element needing protection. Wall framing whichever is closer to one of the following. Eave overhang fire protection.

Overhangs can be open in which the trusses rafters and decking are exposed see figure 1 or enclosed by a soffit. To an imaginary line between two buildings on the lot. The ibc provides options while the irc has only one method of compliance. To the closest interior lot line.