What Year Did Ontario Make Vapour Barrier Code. - Construction - Contractor Talk

What Year Did Ontario Make Vapour Barrier Code.

 
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Old 01-04-2016, 06:43 PM   #1
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What Year Did Ontario Make Vapour Barrier Code.


Hey all. My daughter is looking to buy her first house and we have been looking at the mls listings. I have been building since the eighties and they have always used 6mil vapour barrier since I started. I know lots of the old 60s houses had paper back insulation and I have seen 3 mil poly on lots of older homes from the 60s and 70s. Just wondering if any one knew when they made it code in Ontario. Cant seem to find anything on line. Im guessing it was in the 70s at some point.
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Old 01-04-2016, 07:22 PM   #2
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Re: What Year Did Ontario Make Vapour Barrier Code.


I don't have a definitive answer for you but Joseph Lstiburek talks about vapour barriers starting in the 60's and being common practice by the 70's in Canada in his "Macbeth does vapor barriers" paper.

http://buildingscience.com/documents...vapor-barriers

..an interesting and infuriating read.

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Old 01-04-2016, 10:44 PM   #3
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Re: What Year Did Ontario Make Vapour Barrier Code.


Thanks, very interesting article. Makes you wonder about our codes.
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Old 01-05-2016, 12:49 AM   #4
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Re: What Year Did Ontario Make Vapour Barrier Code.


Quote:
Originally Posted by muskoka guy View Post
Makes you wonder about our codes.
Not if you've ever seen what code committee meetings look like.

If you really want to get annoyed, read up on the history of vapour barriers.
http://markbrinkley.blogspot.ca/2007...r-barrier.html

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

....imagine, then, not much unlike it is now, powerful lobby groups and unsubstantiated "science" dictating codes.

The fact that vapour barriers are drilled into most every builder's head in my area and most have little to no understanding of air barriers is testament to how misunderstood the science is. With the new energy efficiency requirements, the utilization of out board vapour impermeable insulation and our increased use of air conditioning, there's going to be some pretty mouldy walls if there aren't some code changes and educating up here. The US seems to be a fair bit ahead of us in changing these perceptions and amending their codes.

As for your original question, I did a little digging out of curiosity and the first Ontario building code was regulated in 1975 (http://www.mah.gov.on.ca/Page10806.aspx), which I can only assume had a vapour barrier requirement. Prior to that it was the municipalities responsibility to come up with code, so who knows.
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Old 02-05-2016, 09:59 AM   #5
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Re: What Year Did Ontario Make Vapour Barrier Code.


being from BC we have went through crappy code years we have several generations of leaky condos here. There was 3 main reasons for mold

1. was change in code that trapped moisture from framing material between early membranes and poly

2. exterior building design switch products example acrylic stucco less over hangs

3. Interior moisture management. We all shower alot more
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