installing rafter vents


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Old 10-05-08, 07:42 AM
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installing rafter vents

I need to install some rafter vents between the rafters in my attic before I add blowin in insulation. I can't seem to find much literature on how to install them. I'm going with the foam ones. I know you staple them to the roof decking but I have a couple of questions

When I install them, do I slide it down all the way until it "hits" the eaves? And where do I need to worry about stapling them? It would seem to be very difficult to manuever and have room to staple them close to the bottom where the go into the eaves. Is stapling them at the top higher up the roofline acceptable? I don't want these things to be affected by wind and make noises by not being securely fastened, but then again I think once I fill the eaves with the insulation that will pretty much secure it to the roof.

Can anyone who has installed these give some advice on how to best go about fixing them to the roof, and typically how many staples per vent are you using?
 
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Old 10-05-08, 03:48 PM
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In most installations there is enough friction to hold the baffles in place until the insulation is blown under and against them. You can also use construction adhesive along the flat edge and press them in place until the insulation is blown.
 
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Old 10-06-08, 07:46 AM
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There should be a folded batt of insulation in those cavities right now. If there isnt, they should be put in all the lookouts after your vents are installed to keep the blown in insulation from being blown out of those cavities.
It will also help to stabalize the vent that you cant staple to at the bottom.The vent should go down almost halfway into the soffit.... 6-8''.
Staple the vents every 6-8'' & double up staples 2'' apart at the top and as close to the bottom as possible.

To fold a batt, you can cut & get 3 pieces per batt aprox 14'' lenghth wise. Fold it in half, then tuck it in the cavity flush or just past the exterior of the wall plates, cut edges faceing in the attic.
 
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Old 10-10-08, 05:01 PM
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Originally Posted by randy63
There should be a folded batt of insulation in those cavities right now. If there isnt, they should be put in all the lookouts after your vents are installed to keep the blown in insulation from being blown out of those cavities.
I am going to be blowing Cellulose insulation into my attic soon. Originally I was just going to staple some cardboard across the roof beams to make sure that no Cellulose fell down into the soffit, but now it seems like that might be a bad idea.

I am trying to understand what you are saying. Are you saying that there should be some rolled up insulation down in the soffit, but a baffle should hold it back? I just can't picture this, do you know if any picture of diagram? Thanks!
 
 

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