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Grimace 06-12-2009 03:54 PM

attic vent questions
 
I have an approx 1500sf hip roof on a single story ranch and I'm about to install an electric attic vent in place of the middle of 3 current passive vents which are only about 50si each and have a few questions.

First, what is the best way to block off the other 2 passive vents so the fan does not suck air from them? I'm not reroofing soon so external appearance will probably remain the same. I do have a partial bundle of shingles though if its not too hard to patch. (I'm adding plenty off soffit vents so I'll have adequate intake)

Second, what kind of roofing nail should I use? There seems to be so many types and I'm not sure which to get?

Thanks!

kemerick 06-12-2009 08:16 PM

Depending on whats on the back/underneath, I would plywood under (in the attic) and then fill the outside with the correct thickness of wood so it does not stick up.

Regarding the nails, make sure you dont use ones that are too long. I have made the mistake before and it makes it interesting when you bump your head when using the attic.

Gary in WA 06-12-2009 09:54 PM

Use 1-1/4" hot dipped galvanized roofing nails. The nail point is required to come through the sheathing if 1/2" or 5/8". Use 3/4" sheathing, the nail is required to go 3/4" into it, no shorter. That is why you should see nails when 1/2" ply or 7/16"osb is used, if not , improper nail application.
Read the shingle wrapper. Be safe, G

Chemist1961 06-13-2009 07:59 AM

Don't know much about these fans but I would do some homework before taking the big plunge. A fan with no air inflow only creates a vacuum.

Could you solve this by adding more top vents and increasing intake through soffit area? There needs to be a balance of flow coming in as well. Try re posting this under roofing for more feedback

Didn't see what are you live in, is the heat extreme?

Check out this site www.buildingscience.com for attic ventilation inf.
o


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