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Old 2011-09-12, 11:23 AM
needwiz needwiz is offline
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Default Vapor / Vapour Barrier around windows

I noticed that my builder has trimmed most of the vapour barrier so that only about 1 inch of 6mil plastic extends from behind my drywall. There is at least another 3-4 inches of exposed wood (2x4?) window framing before the window. This is consistent for all of the regular windows, so it definitely seems ot be "on purpose.

Should this plastic be extended to meet the spray foam around the window to complete the vapour barrier?

I've poked around online but can't find a clear answer on what is "customary" vs. "textbook" vs. "gold-standard/overkill", so any advice/context is appreciated.

Thanks!
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Old 2011-09-12, 12:15 PM
R.F.D. R.F.D. is offline
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You have any pics to support your explanation?

My guess is that a certain depth of spray foam acts as a vp on it's own and extended the vp, if I understand your description properly, would create a double vp which is not ideal.

Having said that I think they are supposed to tuck tape where the stapled to the framing to prevent heatloss...nice to see builders spray foaming around the windows now, one item wish I had done.
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Old 2011-09-12, 12:42 PM
BartBandy BartBandy is offline
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The proper way is to lap the VB with the air barrier at all windows and doors. This is not done in housing developments, that I've seen. Though yes, the spray foaming of the windows should work.
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Old 2011-09-12, 08:12 PM
needwiz needwiz is offline
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Here's a pretty typical window. VB cut back to the drywall (pretty sure I did see a bead of sealer around the window frame before the drywall went on), 2-3" wood-only gap, then spray foam around the windows. (click to enlarge)



If I've understood correctly that's "typical", but the gold standard would've been to connect/lap the two? I'm guessing I'll have to accept this as "the way it's done".

The next picture is what I'm more troubled by: (click to enlarge)



Pre-drywall, the VB was carefully folded up the wall, out over the double-wall sill and acoustic-sealed very close to the window. It looked like they had really taken their time with it. Then, the drywall guys hacked through it, well behind the sealant line. I did not see a bead of sealant behind the drywall, just the stuff right out by the window.

How reasonable is it for me to ask the drywall be removed so the VB can be patched/resealed to itself?

Last edited by needwiz; 2011-09-12 at 08:13 PM. Reason: fixed typo
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Old 2011-09-12, 10:35 PM
Mark & Lynda Mark & Lynda is offline
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I don't think you have an issue. Your window sill will be installed there. VB should not be required.

You have VB on the warm side behind the drywall to stop cold from meeting warm and condensating behind the drywall where it can mold. If you get an air leak through the window I suspect condensation will occur on top of the window sill and on the window.
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Old 2011-09-13, 12:17 AM
R.F.D. R.F.D. is offline
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Quote:
Originally Posted by needwiz View Post
Here's a pretty typical window. VB cut back to the drywall (pretty sure I did see a bead of sealer around the window frame before the drywall went on), 2-3" wood-only gap, then spray foam around the windows. (click to enlarge)



If I've understood correctly that's "typical", but the gold standard would've been to connect/lap the two? I'm guessing I'll have to accept this as "the way it's done".

The next picture is what I'm more troubled by: (click to enlarge)



Pre-drywall, the VB was carefully folded up the wall, out over the double-wall sill and acoustic-sealed very close to the window. It looked like they had really taken their time with it. Then, the drywall guys hacked through it, well behind the sealant line. I did not see a bead of sealant behind the drywall, just the stuff right out by the window.

How reasonable is it for me to ask the drywall be removed so the VB can be patched/resealed to itself?
Hmmm looks like they took the roto zip to it pretty good...but welcome to new home construction of the 21st century...if you do ask please record the conversation (sarcasm)...likely they will do zip.

Suggestion...if you have access to the house and you are concerned you could go a purchase some tuck tape (red stuff) and do the perimeter up yourself.
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Old 2011-09-13, 01:49 PM
oakvillehomeowner oakvillehomeowner is offline
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just for fun, report it now, and advise them that you will be putting it on your pdi and going to conciliation over it.
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Old 2011-09-14, 07:41 PM
Hometech Hometech is offline
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The second photo of the thick wall has fiber insulation exposed around the window opening. That's why it needs the vapour barrier.
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Old 2011-09-19, 05:53 PM
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good2know good2know is offline
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cutting the vb around the framing is a standard practice

what is unusual (for here anyway) is that the window frame isn't installed yet

I would not be concerned about any of this
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Old 2011-10-15, 06:50 PM
needwiz needwiz is offline
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The builder did go out, pull down the drywall around the (2) affected windows and redid the vb.

Though I feel like I'm finding more things than I should (as a "layman"), they've responded to everything without too much fuss.
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