Step 3 lay the 3 piece of smartvent even with the drip edge and at the roof rake drip edges.
Smart vents roofing.
It allows air to flow freely through the 1 roof decking slit providing more than adequate soffit ventilation to maximize ridge vent effectiveness.
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Do not cut the rafters.
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Nail the fabric in place with 2 roofing nails one high and one low.
Ease vents or smart vents allow air to enter the roof from under a row of shingles.
At the location of the shingle course where the smartvent is to be located measure up from the bottom of the shingle the weather edge 6 to 7 before installing the actual shingle.
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Smartvent is a tapered under shingle plastic product designed for installation along the soffit edge of the roof or the facing edge of dormer rakes and goes virtually unnoticed.
Step 3 make lines at the 6 and 7 marks and cut through the top of the previously installed shingle and the plywood only.