Roof Leak Where Siding Wall Meets Roof Line

Proper roof wall abutment flashing examples.

Roof leak where siding wall meets roof line.

You can crack roofing if you walk on it so be careful. Because the wall is some kind of solid wood metal flashing should have been installed under the shingles and up the face of the wood wall into a groove in the wood. When installing a flat roof flashing against a wall is critical. Other materials such as slate concrete tile or clay tile may not be so forgiving.

Rotten or missing trim or siding can allow water to leak behind flashing and into your roof. The solution to rotting sidewalls is a small piece of bent metal called a kickout flashing at roofing suppliers which simply directs all that water away from the wall. Homes with gables at different levels on the roofs often have siding that meets the roof line. A roof leak at the edge of a dormer can allow a lot of water to enter your home.

This means the expanse of shingles slate shakes whatever. Then there is the transition of the. Worn out flashing or missing sealant can also cause roof leaks around dormers. It is not good practice to install flashing or bring the membrane up behind the vinyl siding.

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. Instead of a standard straight cut you must cut these pieces of siding at the same angle as the roof. It appears a roof valley ends at the rainwater collector box tight against the side wall of the house. Vertical leaks saturated the insulation inside the walls and the water cascaded over the several layers of floor levels on the 2 story to bi level intersections.

Of that is the case its an unwise roof design to begin with. This is exactly what happened as the run off from the roof traveled behind the siding and through a layer of rigid insulation and a layer of wall sheathing. Dormer leaks can be caused from a number of issues. Each year we receive calls to help diagnose and repair siding leaks that are occurring at siding and roof intersections such as where a garage roof meets the main body of the house and has siding installed on the wall above the roof.

I made this video this morning and i hope it help explain the flashing wall detail where the siding meets the roof. Even if the roof has been properly flashed against the sidewall this one hasn t water can still run down the side of the house and behind the siding causing rot.