Roof flashing is a thin material usually galvanized steel that professional roofers use to direct water away from critical areas of the roof wherever the roof plane meets a vertical surface like a wall or a dormer.
Re roofing around vents.
Load the caulking gun to have it ready when needed.
Nesting each new row below an existing one keeps the new nails 2 inches below the existing which will help minimize any splitting of the sheathing.
Pull back on the plunger of the gun and place a tube of caulk.
Use galvanized roofing nails long enough to fully penetrate the sheathing typically 1 1 2 inches for a second roof and 1 3 4 inches for a third.
Venting prolongs the life of the roof.
Cut the old caulk line.
Otherwise replace it with a new one that will fit the hole or pipe.
If you damage shingles while doing this repair the shingles see next step.
Remove air vents and pipe flashings by prying out or unscrewing the fasteners holding the fixture.
Position a ladder carefully against the edge of the roof securing the legs from wobbling or the ladder from folding.
Installing shingles around attic vents plumbing vent stacks and furnace stacks is basically the same process.
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Openings along the sides allow air out of the attic cooling the space and lowering your air conditioning bill.
How to seal around roof vents 1.
The building codes and building science for natural roof ventilation however only appeared in the 1940s.
Roof ventilation in a cold climate vents moisture and ensures a cold roof temperature to avoid ice dams.
Roofers use a circular saw to cut a long slot along the roof ridge if there isn t one then cover it with a plastic flap as shown or a flexible vinyl matrix.
Remove debris make sure your roof valleys are clear of debris re shingle valleys valleys may need to be reshingled with new ice and water shield put in place.
Reuse a vent or flashing only if it is like new.
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