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Old 09-08-2011, 03:38 PM   #1
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gable end venting


I am in the process of re-siding my 40's era house and my existing gable end vents are 12"x27", now to no surprise this is not a standard size at all from what I am finding. What are my best choices here, I can have a custom one made for about $70 or so. or I can just buy a premade small one, the local stores seem to stock 12"x18". Or I can make my own.

I am leaning more towards making my own but my question is is the certain specs I should follow? Can I make them out of my scrap of 5/4" whitewood trim? Or should I make them out of something a little better? I could make the frames from 5/4" material and the louvers out of a 5/4" cedar decking material? Also what about the angles for the louvers, I could just use my speed square and quickly & easily mount them up at a 45 degree angle.

What are your thoughts?
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Old 09-08-2011, 06:35 PM   #2
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Gable vents are the least efficient way of venting an attic. Any house built during that era was under vented from the start.
Using modern venting calculations, see how much venting you actually need for the house. The use of ridge and soffit venting is one of the most efficient. If you can can use that, you can eliminate the gable vents entirely.
Do a Goggle on attic venting to see what's out there.
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Old 09-08-2011, 08:29 PM   #3
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When i had mine resided, I spray painted the existing metal vents and covered them with screen and wire mesh to keep the birds out (as they will leave presents all down your new siding) You could make a frame from pvc or if you are also wrapping with aluminum and have a metal break on site you could bend a metal frame and attach the metal with the little zip screws that you use for gutter, that is how the contractor did mine. I like pvc better but it only comes in white that I can find at lowes or hd.
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Old 09-08-2011, 11:41 PM   #4
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I can not do soffit venting because I do not have any soffits. When I had an insulation company come out and do some work they installed 6 box vents into the roof, and they said it was the best they could do because I did not have any soffits.
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Old 09-09-2011, 12:03 AM   #5
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Rule of thumb is 1 square foot of free vent passage per 150 sq ft of attic floor area (1:150). That's for a quick visual assessment. The IRC treats the basic requirements in R806.

Also, try this link. It's a good primer on the subject.

http://www.airvent.com/pdf/literature/PAVbooklet.pdf
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