On an existing roof the roofing contractor cuts away the top of the roof sheathing.
Roof vent gap.
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Ridge vent comes in.
Vents evenly spaced underneath the roof provide intake.
This of course would all be trumped by the fact that the ridge vent mfg.
Multiply it by 18 square inches the net free air per foot of ridge.
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Unless you re bulk filling rafter bays between 2 10 or 2 8 rafters with closed cell spray foam this approach will likely require you to fur out the rafters to accommodate additional insulation to achieve desired r values.
Owens corning ventsure 11 in.
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.
The gap size typically between 1 and 3 inches depends upon the style of ridge vent chosen.
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Mark even multiplying that 1 2 wide gap in your attic times the length of the vent might give you a surprising number that would likely satisfy the code.
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For best performance the airspace in the vent chute should be a minimum of 2 in.
May require a minimum gap size.
A new roof is more than just shingles.
Residential and commercial roofing shingles slate roof ventilation roof underlayments asphaltic and tpo roof membranes.
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Effective attic ventilation systems reduce damaging heat and moisture in your attic promote energy efficiency by helping to reduce the load on your air conditioner in the summer and also reduce the risk of ice dam formation on your roof.
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