1 Hour Roof Over Hang Protection Detail

See attached image we are hoping to replicate this in the addition.

1 hour roof over hang protection detail.

The irc in table r302 1 1 only. To the centerline of a street an alley or public way. Overhangs can be open in which the trusses rafters and decking are exposed see figure 1 or enclosed by a soffit. Eave overhang fire protection.

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. 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. To the closest interior lot line. The ibc provides options while the irc has only one method of compliance.

Roof overhangs must have a one hour fire protection on the underside when less than 5 from the property line and cannot project closer than 2 from the line. Use flat horizontal soffits see figure 3 instead of attaching the soffits to the sloped joists which creates sloped soffits. Soffits a soffit encloses the underside of sloped or flat roof overhangs. Walls less than 5 feet from the property lot line must be of a listed hour fire1 resistant construction.

Wall framing whichever is closer to one of the following. An overhang protects the upper portion of the wall that it is attached to from rainfall and it also shades the windows under it from the sun. However a garage located within 2 of the property line is permitted to have a 4 inch roof eave projection. Overhangs such as roof eaves and soffits are one element needing protection.

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. To an imaginary line between two buildings on the lot. Hi all we need to provide one hour rated protection for under eaves on a residential property remodel. The existing open eaves have t g sheathing with exposed rafter tails and 2x blocking b w rafters.