A Detailed Guide to Installing Roof Flashing on a Brick Wall Properly

Installing roof flashing against a brick wall is an effective way of keeping the roof free from water damage and other damages. It is important to use the right kind of flashing materials, techniques and tools for it to work effectively. It is best to hire a professional for this task as wrong installation of roof flashing can cause adverse damaging effects. However, if you are confident, you can do it yourself as well.

First and foremost, you’ll need to look into the size of the flashing you intend to use. Generally, 8-inch flashing is used, although the size may vary depending on what your needs are. The base flashing is then installed, beneath the last layer of shingles or over any metal roofing material.

Whenever there are joints between flashing, caulk them to make sure that water won’t enter. You also want to caulk any exposed nail heads as well. Step flashing or “L” shaped metal flashing is often shorter in length than the usual and should be used in an angled roof. This starts from the bottom of the angle and goes up the roof.

Counter flashing will then be necessary to prevent water running down the outside of the flashing and then into the base flashing located beneath. You will therefore need to apply a caulk line above the back of the base flashing and then cut a 1.5 inch slot into the brick walls with a masonry blade and circular saw. After a flashing is installed in the slot, it needs to be sealed with caulking.

For brick walls that are thicker than 1 brick, it is important that you place through-wall flashing as this will ensure moisture is directed away from the wall instead of going deeper into it. As for chimneys, you will need to use flashing for the intersection of the roof with the chimney, the base and the crown.

Moreover, the foundation should also be flashed where it meets the brickwork. Flashing should even extend from the brick veneer wythe, through the outside face of the brick and up to the mortar joint within the wythe.

In conclusion, installing roof flashing against a brick wall is not something you should take lightly. You must make sure that the right tools are used and that it is installed in a way that will not only be effective, but also safe. A professional should be hired if you are unable to confidently get the job done yourself.