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.
Roof leak where siding wall meets roof line.
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.
If your roof is asphalt then you can walk around with ease.
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.
When installing a flat roof flashing against a wall is critical.
It is not good practice to install flashing or bring the membrane up behind the vinyl siding.
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.
Of that is the case its an unwise roof design to begin with.
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.
Worn out flashing or missing sealant can also cause roof leaks around dormers.
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.
Other materials such as slate concrete tile or clay tile may not be so forgiving.
Then there is the transition of the.
Homes with gables at different levels on the roofs often have siding that meets the roof line.
This means the expanse of shingles slate shakes whatever.
Proper roof wall abutment flashing examples.
One of the first questions we ask is have you had your home resided is the past few years.
If your roof is older it is possible that the leak is within the roof field.
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.
I made this video this morning and i hope it help explain the flashing wall detail where the siding meets the roof.
It appears a roof valley ends at the rainwater collector box tight against the side wall of the house.
Rotten or missing trim or siding can allow water to leak behind flashing and into your roof.
A roof leak at the edge of a dormer can allow a lot of water to enter your home.
