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Basement Waterproofing & Exterior Insulation

  • Last Updated:
  • Nov 2nd, 2020 4:12 pm
[OP]
Deal Addict
Apr 26, 2003
1283 posts
483 upvotes

Basement Waterproofing & Exterior Insulation

I've dug through this forum and haven't found a decent answer here.

I'm looking at getting exterior basement waterproofing done on our 50 year old home as we're renovating the basement. There already has been water leakage in years past through the block walls and it's clearly noticeable, so we're getting that resolved.

My question is if rigid foam insulation can be installed on the exterior of the walls as the basement after the waterproofing is done. I assume the waterproofing has to be done directly onto the concrete, but would rigid foam insulation added on after the waterproofing membrane need to be covered from the elements afterwards? Can it simply be buried when the waterproofing job is done?

I am still having the interior walls insulated with batt insulation, but would it help is it worthwhile to add on insulation on the exterior of the basement walls?
2 replies
Sr. Member
May 12, 2014
890 posts
510 upvotes
Markham, ON
The company I went with did a rubberized coating on the concrete, then a dimpled membrane and then styrofoam. The person I dealt with said that a protective barrier after the insulation is not required. Two companies that I contacted said the same thing, so I didn't push to get something added on top of the insulation.

They changed the weeping tile and replaced it with a solid pipe inside a corrugated pipe inside a sock. They then placed gravel, and covered it with a non-woven landscape fabric to stop the stone from mixing with the soil.

Take a look at 6.1 for the diagram.
https://www.nrcan.gc.ca/energy-efficien ... tion/15639
[OP]
Deal Addict
Apr 26, 2003
1283 posts
483 upvotes
Was the insulation included in your quotes or did you have to ask them to include that? I've gotten a few quotes for waterproofing and they ONLY do the waterproofing and I'm asking one of them to see if they'll add the foam insulation after.

I've seen that government of Canada site and it shows the need for flashing over the edge of the insulation, guess you didn't do that? Did your insulation end up being below grade or did it stick out?

Which company did you end up going with?

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