Roof To Wall Intersections

Roof to wall connection some general guidance roof are different than walls all materials are vapor impermeable vapor control layer is located on exterior side of insulation issue is climate dependent interior vapor barrier and a roof system that has the air and vapor control layer on the exposed side can result in a sandwhich for moisture.

Roof to wall intersections.

The sheet acts as a backup at a vulnerable junction. At roof to wall junctions including that there must be. The current flashing details in the 2013 international residential code irc for sloped roof wall intersections are very difficult to construct. The flashing extends up the wall at least 4.

A 75 mm minimum wall cladding cover over the upstand a 35 mm minimum gap between the wall cladding and the roofing cover over the roofing as per e2 as1 table 7 depending on wind zone and roof pitch wall underlay lapped over roof underlay upturn upturn to eave flashing 4 1 1 1. At roof to wall intersections see figure 1. Roof flashing roofing materials roof deck stone veneer home repair rooftop 2d townhouse brick. There have always been problems with the flashing details at the roof to wall intersections of head walls rake walls and chimneys especially if brick or stone veneer or stucco is used.

The most common roof to wall intersections involve either a gable roof with its ridge running perpendicular to the wall or a shed roof that slopes downward away from the wall. Ideally i like to start by installing a 3 ft. Flashing joints are lapped 6 in the direction of water flow. Sheet of housewrap or even better a piece of self adhering roof underlayment to the wall before the first truss or roof rafter is placed against it.

The metal flashing is formed with a hook edge and cleated on 12 centers. Our page top photograph illustrates a successful installation of flashing and counter flashing along intersection of a roof surface with the side of a brick constructed dormer. Proper installation of flashing and counter flashing at the intersection of a vertical wall with a roof surface is required to avoid roof leaks. The flashing extends onto the roof a minimum of 2 inches 4 inches is preferable in more severe climate areas.

As a result most typical construction does not use any type of through the wall flashing which results in leaky wall complaints. Tape the top of step flashing with 4 inch wide minimum self adhering modified bitumen roof tape. Do not seal housewrap or building paper to step flashing. Use step flashing that has a 2 to 4 inch longer vertical leg than normal.

The flat roofing material must go up the wall a minimum of 12 or up the wall and over the top of the wall if the wall is less than 12 high.