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Old 01-03-2011, 09:30 AM   #1
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air leak from roof ventilation or other issue?


I have recently purchased a home, and I am prepping to paint a room on the second floor that will become a nursery, after removing the molding from around the base of the wall in one section I noticed cold air coming in from gap between the floor and the dry wall. With the way the house is built, the ceiling fallows the pitch of the roof, there is no attic space above this room just drywall, rigged insulation, air gap, then plywood for the roof.
I am assuming the draft is part of the roof ventilation, but what would be the best way to keep it from coming in the room? Or am I wrong and I have an issue somewhere?
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Last edited by phymonkey; 01-12-2011 at 09:05 AM.
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Old 01-03-2011, 10:13 AM   #2
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air leak from roof ventilation or other issue?


Ayuh,... If you expect Any answers,...

I suggest you resize your picture to something that fits the forum...

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Old 01-12-2011, 09:06 AM   #3
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air leak from roof ventilation or other issue?


sorry about that,
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Old 01-12-2011, 12:55 PM   #4
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air leak from roof ventilation or other issue?


From what I can tell it looks like you have an "attic area" in the wall which runs perpendicular to the window and left of the wall outlet. Anways, 99% of homes have air movement in the walls. One way of curing this is to apply caulking at all joints to act as a draft stop. In your case you would apply caulking where the wallboard terminates just above the subflooring. Use a heavy bead of elastomeric caulking.

Last edited by Nucon; 01-12-2011 at 12:57 PM.
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Old 01-13-2011, 08:33 AM   #5
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air leak from roof ventilation or other issue?


Thx for the reply, I think I will take your advice, I just wanted to be sure, I found too many shortcuts taken by the builder of this house.
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Old 01-13-2011, 04:34 PM   #6
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air leak from roof ventilation or other issue?


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Originally Posted by Nucon View Post
From what I can tell it looks like you have an "attic area" in the wall which runs perpendicular to the window and left of the wall outlet. Anways, 99% of homes have air movement in the walls. One way of curing this is to apply caulking at all joints to act as a draft stop. In your case you would apply caulking where the wallboard terminates just above the subflooring. Use a heavy bead of elastomeric caulking.
Just noticed a big box store (starting with the letter H ;-) ) has this caulk on sale in a two pack
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Old 01-14-2011, 07:10 AM   #7
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air leak from roof ventilation or other issue?


I think I will be stopping by there, thx
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Old 01-14-2011, 07:28 AM   #8
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air leak from roof ventilation or other issue?


I understand what you are asking, you have it outlined in red also. Depending on the actual gap size, you may be better off using "backer rod". This (to me) is a black (usually), round foam material (comes in different diameters) made to stuff into these type cracks before caulking. Most of the time, IMO, using caulk in these gaps, for these long runs, the caulk will tend to shrink as it dries. Even the best silicone caulks. The backer rod will do most of the gap stuffing/air movement blockage, the use the caulk to finish this off. I have actually put some caulk on the backer rod as I put it into place to hold it in place, so it doesn't move when I do the final caulk. Hope this helps, David
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Old 01-14-2011, 08:50 AM   #9
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air leak from roof ventilation or other issue?


Thx, I will have to look into the backer rod, didn't know there was such a thing. It will be a huge help to fill the gap, some places are larger than others.
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Old 01-14-2011, 02:44 PM   #10
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air leak from roof ventilation or other issue?


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Thx, I will have to look into the backer rod, didn't know there was such a thing. It will be a huge help to fill the gap, some places are larger than others.
since you're dropping by the "H" store look in the aisle where they sell door / window weatherproofing products - all sizes of backer rod there - should be able to get what you need for a few $.

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