How to install a
dormer vent on a comp shingle roof
Step 1
Drive a large nail from your attic to mark the location of your dormer
vent.
Step 2
Mark your roof using the dormer vent
and nail as a guide
Step 3
Cut out the remaining shingles with a roofing knife.
Cut out the sheathing using a power saw. (Avoid cutting the
shingles with the saw as this will dull the blade instantly.)
Cut out sheathing:
Step 4
Remove any fasteners to prevent vent from sliding under shingles.
Slide dormer vent under shingles.
Cut back shingles 1" to 1-1/2" to allow
water to run freely from side of dormer vent as indicated below
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