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Install roof vent no shingles.
This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof.
Seal the top nail holes and continue on up with your shingles.
To calculate an example of exhaust and intake use 25 feet of roof ridge vent.
Install the shingles up and halfway past the vent hole or stack.
Cover the entire flange with shingles to integrate it better into the roof.
Your roofer will build this frame just a little larger than size of the vent leaving 1 8 inch of extra room on each side.
Drill a hole upward through the middle of the area you desire and leave the drill bit sticking up through the roof so you can find it from the outside.
Using the example above three round vents would be needed 432 144 3 vents or nine square vents 432 50 8 64 or 9 vents.
Place a line of roofing tar or caulk on top of the vent s flange or its bottom flap using a caulk gun.
Installation first requires a wood frame made of 2x4s installed from the attic between two studs.
Trim the shingles with your utility knife photo 14.
Hammer down any large nails that are exposed by the removal.
Locate the drill bit.
Nail it down with your roofing gun top and bottom.
Install a layer of roofing insulation as recommended by the roofing manufacturer.
Next position your ladder against your home and climb up to your roof.
Multiply it by 18 square inches the net free air per foot of ridge.
Fasten the vent to the roof decking and rafters or trusses by nailing through the flange on both sides of the vent using the nails and nail spacing recommended by the manufacturer.
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First head up to your attic and determine where you want to install your roof vent.
Vents evenly spaced underneath the roof provide intake.
Next install your vent or stack flashing over that row of shingles photo 13.
To vent the roof holes are cut in the old roof above the soffit which pulls air through the soffit vents underneath.
Add any connectors and end caps that came with your ridge vent system to ensure the vent is watertight.
Press new shingles onto the caulk and use nails at the top of each shingle to fully secure them to the roof.
Glue down shingles to cover the bottom of the vent.
