Here s a few of the defects that can cause dormers and their windows to leak.
Roof leak dormer valley.
Most roofers that install shingles will not have rubber membranes with them to do such areas.
Most roofers that do shingles will use a heavy base paper instead of a rubber membrane.
A roof leak at the edge of a dormer can allow a lot of water to enter your home.
1 improperly installed or deteriorated roof to wall or roof to roof valley flashings at top back of dormer.
Run the water over the place where you think the leak might be located.
A roof valley is very prone to leaks especially if you have an older roof.
Most shingle installers will use a thick 30 lb paper as a base for the valley.
A roof valley can be formed when two opposing sloped roof planes meet.
The reason why the roof valley is such a sensitive area has to do with all the rainwater and or melting snow that accumulates and flows through the valley on its way into the gutters.
There are many different types of valley leaks.
2 lack of flashing at top of trim over window.
3 deteriorated caulk around window and sill.
Louis mo home had a leaking dormer shown above that was problematic for years.
For example soak the downhill side of a chimney first then each side then the top on both sides.
The interior walls of the dormer were often condensated and heavy rains would lead to water damage on the lower level foyer ceiling.
Start low soaking the area just above where the leak appears in the house.
Even though these were previously billed as solutions for the leak a new roof and new siding did not stop the leaking.
Roof leaks are also very common in the winter when all the snow accumulating on a roof creates a potential for a roof leak to develop especially if a roof valley on your property is not properly flashed.
Dormer valleys looking for roof leaks on the outside of your house.
This is one type of leak where experience can give a big advantage in locating and fixing the problem.
Dormer leaks can be caused from a number of issues.
Isolate areas when you run the hose.
Check for power lines or electrical wires attached to your roof near the dormer.
If you don t want to wait for rain to look for the leak try bringing the garden hose up on the roof.
If a leak is difficult to find enlist a helper and go up on the roof with a garden hose.
Valley areas are prone to leak due to the lack of using proper materials.
Rotten or missing trim or siding can allow water to leak behind flashing and into your roof.
