Flat Roof Against Wall

Ideally i like to start by installing a 3 ft.

Flat roof against wall.

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. Housewrap creates the foundation. Flat roof and flashing against brick wall install base flashing under shingles or over metal roofing material. 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.

Follow the photo for illustrated instructions. Flashing must be applied along the gap between the flat roof and the brick wall to ensure that everything is watertight and secure. You need step flashing which is metal flashing that is in an l shape. 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.

If the membrane is asphalt built up or modified bitumen a cant strip is typically used. 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. The sheet acts as a backup at a vulnerable junction. Step 3 flashing angled roofs with the step method you can use the step method to flash an angled roof.

You have to install the roof side of the flashing either under the last layer of shingles or over the roof materials if the roof runs flat up against a brick wall. For example a one story garage with a flat roof may be attached to a two story house. 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. Proper roof wall abutment flashing examples.

A base flashing and counter flashing are typically used. This makes it very simple however it does create a weakness in the design.