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Interior Inspections Contains discussions about the interior portion of a home inspection. This includes stairs, walls, floors, ceilings, smoke detectors, etc.

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  #1  
Old 3/31/15, 2:16 PM
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David Asselin David Asselin is offline
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Default Attic and Poly Question

Why isn't there a poly to act as a air/vapor barrier between living space and attic? I read that if there is too much venting in the attic, it can create a negative pressure drawing warm most air from the living space up in the attic. Also if there isn't enough insulation, warm moist air is again a problem going in the attic. Why not have a polyethylene on the ceiling after the drywall like on outside walls?

Thanks

David
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  #2  
Old 3/31/15, 4:25 PM
Kenneth A. Ramm Kenneth A. Ramm is offline
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Default Re: Attic and Poly Question

Quote:
Originally Posted by dasselin View Post
Why isn't there a poly to act as a air/vapor barrier between living space and attic? I read that if there is too much venting in the attic, it can create a negative pressure drawing warm most air from the living space up in the attic. Also if there isn't enough insulation, warm moist air is again a problem going in the attic. Why not have a polyethylene on the ceiling after the drywall like on outside walls?

Thanks

David
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  #3  
Old 3/31/15, 4:38 PM
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David Asselin David Asselin is offline
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Default Re: Attic and Poly Question

Hi, it's a general question for new homes. Thanks.
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  #4  
Old 3/31/15, 7:26 PM
Dallas Nagy Dallas Nagy is offline
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It should be installed on warm side of insulation. Walls and ceilings in all of Canada. It goes on right before drywall goes up. Not all city's require a poly inspection for code compliance, but a quick look on the Burnaby website indicates they do have a poly stage inspection before drywall goes up. It has been a code requirement to have since late 80's I belive.
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  #5  
Old 3/31/15, 7:54 PM
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Default Re: Attic and Poly Question

On the ceiling? I know about outside walls but I never see it on the ceiling and was wondering why. Thx
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  #6  
Old 3/31/15, 7:58 PM
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Roy Lewis, CMI Roy Lewis, CMI is online now
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Default Re: Attic and Poly Question

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  #7  
Old 3/31/15, 8:06 PM
Kenneth A. Ramm Kenneth A. Ramm is offline
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Default Re: Attic and Poly Question

Here these are from another thread today.
http://www.airbarrier.org/resistive/...e_barriers.php

http://www.greenbuildingadvisor.com/...vapor-retarder

http://www.greenbuildingadvisor.com/...vapor-barriers



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  #8  
Old 4/1/15, 8:30 AM
Erik Schmidt Erik Schmidt is offline
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Default Re: Attic and Poly Question

They must do things differently in BC
Alberta houses have poly on the ceilings under the attic.
Even my 1951 house has a sort of wax paper over the plaster ceiling.
Without looking it up, the code probably specifies vapor barrier, with a minimum number of perms.
There are other ways to accomplish that without using poly.
Talk to a home builder or code inspector in your area to get the real story, not likely that builders are not following code, given the problems that BC has been having with condos and such.



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Last edited by eschmidt; 4/1/15 at 8:37 AM..
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  #9  
Old 4/1/15, 8:49 AM
Robin Wells Robin Wells is offline
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Default Re: Attic and Poly Question

Quote:
Originally Posted by dasselin View Post
Why isn't there a poly to act as a air/vapor barrier between living space and attic? I read that if there is too much venting in the attic, it can create a negative pressure drawing warm most air from the living space up in the attic. Also if there isn't enough insulation, warm moist air is again a problem going in the attic. Why not have a polyethylene on the ceiling after the drywall like on outside walls?

Thanks

David
I would check building code.. but it sure is required in Ontario.. and I suspect in BC as well.



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  #10  
Old 4/1/15, 8:49 AM
Robin Wells Robin Wells is offline
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Default Re: Attic and Poly Question

Quote:
Originally Posted by dasselin View Post
On the ceiling? I know about outside walls but I never see it on the ceiling and was wondering why. Thx
Do they insulate the ceilings.. if so should have vapour barrier.



Robin Wells, CMI
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  #11  
Old 4/1/15, 8:51 AM
Robin Wells Robin Wells is offline
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Default Re: Attic and Poly Question

Quote:
Originally Posted by dasselin View Post
On the ceiling? I know about outside walls but I never see it on the ceiling and was wondering why. Thx
Do they insulate the ceilings.. if so should have vapour barrier. No, seriously they are supposed to have it.
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Attic and Poly Question-bc-vapour-barrier-jpg  



Robin Wells, CMI
Barrie, Ontario, Canada
Wells Home Inspection Services
Midland, Ontario, Canada
RAW Chimney Cleaning & WETT Inspections

Last edited by rwells4; 4/1/15 at 8:56 AM..
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  #12  
Old 4/1/15, 10:18 AM
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David Asselin David Asselin is offline
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Default Re: Attic and Poly Question

Thanks,

David
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  #13  
Old 4/1/15, 10:23 AM
Dallas Nagy Dallas Nagy is offline
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I have insulated homes in 5 different provinces. It is always required in new homes and has for quite some time.

At what stage are you looking for it? Digging through blow in insulation during inspection?

If the installer put the poly on real tight and straight without wrinkles, and you are looking for it from the attic digging through blown in cellulose with a weak flashlight... yeah you might not see it readily.
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