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Old 10-10-2011, 10:10 AM   #1
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Single slope roof venting


How to calculate the amount of ehaust i need for a single sloped roof that is1/12, 36'x 38', 24" overhang with full vent soffit, low end proper vents to the high end which is 3' 2" above the ceiling insulation. Looking to put a verticle wall vent at the high end that is about 2" in height for the length of the 36' wall.

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Last edited by Frederic Urich; 10-10-2011 at 10:22 AM. Reason: confusing
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Old 10-10-2011, 11:58 AM   #2
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Single slope roof venting


A very nice venilation calculator: http://www.metalera.com/CalcAboveSheathing.aspx?id=2094

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Old 10-12-2011, 12:00 AM   #3
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Single slope roof venting


That calculator wouldn't go below 3/12 for your 1/12 slope for me. The other one for ceiling attics (as in your case) would, though, the other link.

You don't mention if it has a vapor barrier on the ceiling or not. If not, figure 9 square inches for every lineal foot of soffit intake and the same for ridge exhaust vents. This gives you 1/150, 1/2 total for 1/300.

Your 2" high sounds right, depends on the screening size, spacing of the wires for the NFVA- net free venting area: http://www.airvent.com/homeowner/pro...it-specs.shtml

Be sure you are getting 9 NFVA at the soffits, some manufacturers of punched vinyl de-rate it correctly; http://files.buildsite.com/dbderived...rived92755.pdf

I suggest 2-3" holes to maximize the intakes and exhaust because of the very low slope.

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Old 10-12-2011, 11:59 AM   #4
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Single slope roof venting


2nd link has no data...
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Old 10-13-2011, 10:16 PM   #5
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Single slope roof venting


End of second paragraph in your link, "NFA Calculator", from here: http://www.metalera.com/CalcAboveSheathing.aspx?id=2094
OP, enter your square footage and lineal footage of soffit and ridge vent........

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