How can I find out the weather tightness rating for my new home? How do I know if it met the standards outlined for new homes in southern Ontario.
Looking for a fast response please!
Thanks Paul, I can google that. One would think that if building standards required a certain standard that the rating would be recorded somewhere for the buyer to see.
In Vancouver, we are required to do an Energy Audit that determines the ACH (air exchanges per hour) performance of a home proposed for renovation.
The change in ACH is determined by a professional performing a negative air test (blower door) at the home at the beginning an the end of a renovation.
Ideally, ACH would be in the range of 3.0-3.5 air exchanges per hour (if not lower). Older homes here in Vancouver can often test in the 15-20 ACH range.
I've just briefly looked at some studies covering ACH in southern Ontario and it seems like the 3.0 ACH is considered to be very good weather tightness.
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