The side wall flashing problem and solution
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Common rot spot
The intersection between a roof and a sidewall can be a rot problem waiting to happen. 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.
The solution to rotting sidewalls is a small piece
of bent metal called a kick-out flashing (at
roofing suppliers), which simply directs all
that water away from the wall. It installs just like standard
step flashing, except that half of it hangs over the
edge of the roof.
Install the flashing
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Photo 1: Slip in the flashing
Lift the bottom shingle and slip in the kick-out flashing. Nail it to the sidewall (or glue it if nailing isn't possible).
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Photo 2: Cover with cap flashing
If the kick-out and step flashing can't tuck behind the siding, screw on cap flashing to cover it, then caulk along the top.
Inspect the sidewall around and underneath the fascia and inside the house for signs of moisture damage, and repair any rotted areas. Add felt, if needed, before nailing the new wood on, and prime the new wood on all four sides before installing it.
Install the kick-out flashing underneath the first
shingle (Photo 1). If the shingle already has flashing
on it, the kick-out flashing has to slip beneath it, and
you'll have to loosen or remove siding to do this. If the
sidewall is stucco or solid wood like ours and you can't
open it to get flashing behind it, continue the step
flashing to the peak of the roof, then cover the step
flashing with cap flashing (Photo 2).