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Concrete foundation damp proofing

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Posted by: from Gravenhurst
11/1/2022 at 11:05:43 AM

Have a few questions about our home. It is an above ground basement with a 4 foot frost wall, the below grade portion was never damp proofed before back fill. Is this a requirement?

Also, the above grade portion - should the form ties have been left flush?

Concrete foundation damp proofing
Concrete foundation damp proofing
Concrete foundation damp proofing
REPLIES (5)
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Ian in Edmonton
Date/Time11/1/2022 at 2:16:24 PM

9.13.3.1. Except as provided in Article 9.13.3.1., where the exterior finished ground level is at a higher elevation than the ground level inside the foundation walls, exterior surfaces of foundation walls below ground level shall be dampproofed. 9.13.3.1. describes 'waterproofing' which is required if there is hydrostatic pressure.

These Code references are from the Alberta Building Code, it should be no different across the country.

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Rina in Gravenhurst
Date/Time11/1/2022 at 3:04:45 PM

Thanks we have the same section in Ontario. When discussed with officials we were told: basically dampproofing is only required on the foundation portion below grade, if the below grade portion contains an interior space.

Since the basement walls are above grade they make it seem the 4 foot frost wall below grade didn't need any damp proofing? Does this make sense?

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Ian in Edmonton
Date/Time11/1/2022 at 4:37:21 PM

There is a Section in the Code regarding 'Crawl Spaces' (9.18.) and the Code index for Dampproofing directs you to that Section however there is no mention of dampproofing requirements anywhere in that Section.

Therefore the advice you are getting from your local authority seems correct, something I had not known.

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Date/Time11/2/2022 at 10:29:09 AM

Yes, please take a look: https://www.buildingcode.online/1570.html

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Richard in Edmonton
Date/Time11/2/2022 at 5:11:46 PM

The previous respondent posted a link to the foundation dampproofing part of the Code previously mentioned. The Crawl Space portion of the OBC also does not mention exterior dampproofing. https://free.bcpublications.ca/civix/document/id/public/vbbl2014/ep001029.18

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