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Sealing rafter vents before blowing in? Foam? Fiberglass?


sammyc53's Avatar
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Join Date: Apr 2007
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12-07-12, 05:23 PM   #1  
Sealing rafter vents before blowing in? Foam? Fiberglass?

Alright, cut into the boards that were blocking ventilation from vented soffits into attic. This allowed me to install rafter vents along the rafters down in the soffits.

Great, right?

Now, I'm about to blow in insulation, but I want a seal so that:
1), my nice new insulation is not exposed to outside elements.
2), all my insulation doesn't flow into the soffits.

What's normally done here? Pack around it with fiberglass? Canned foam? A little more expensive, but I can handle it. It's small-ish gaps, and I'm doing 20 rafters. Maybe 4-5 cans.

Here is a picture:
http://i.imgur.com/cobgUl.jpg

 
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Nashkat1's Avatar
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12-08-12, 03:45 PM   #2  
I want a seal so that:
1), my nice new insulation is not exposed to outside elements.
2), all my insulation doesn't flow into the soffits.
I would cut screen wire to cover the spaces (I like some breeze over my attic insulation), or pack it with fiberglass.

 
PJmax's Avatar
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12-08-12, 04:05 PM   #3  
I agree with Nashkat....... pack it LIGHTLY with fiberglass.

 
Halton's Avatar
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12-08-12, 04:17 PM   #4  
Also......how far up do those rafter vents go?

They should terminate just above the top of the blown in insulation.

And......be very careful not to inadvertently clog them while doing the blow.

You can slide in a temporary cardboard deflector to cover the top of the rafter vent as you go along.

Once you fill that area fully with insulation then you can just remove it and cover the next section.


Last edited by Nashkat1; 12-09-12 at 10:01 PM. Reason: Remove formatting
 
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