How To Seal A Flat Roof Against A Wall

Below are two photographs of roof wall step flashing completed and effective of a slate roof against a brick wall below left and in process with step flashing against a dormer sidewall before the dormer siding has been put in place below right.

How to seal a flat roof against a wall.

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. Install base flashing under shingles or over metal roofing material. Proper roof wall abutment flashing examples. These kinds of houses often have a roof that butts against a wall.

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. Metal roof flashing is a galvanized sheet metal bent at right angles with about eight to 12 inches on each side of the angle. If the roof runs flat up against the brick wall you must install the roof side of the flashing either under the last layer of shingles or over the roof material if it is metal. The sheet acts as a backup at a vulnerable junction.

It is commonly used in two story and side split houses. Follow the photo for illustrated instructions. When the roof of an addition garage porch or patio meets a brick wall the intersection creates a number of concerns. Metal roof flashing can be use to seal gaps between roof walls.

Here is an attempt though maybe not a very good one to make the roof flashing serve also as a through the wall flashing with a tile roof. Ideally i like to start by installing a 3 ft.