[Greenbuilding] Waterproofing a shallow frost protected foundation

[john salmen]

If I interpreted this right you have 2” of foam over the nexcem and everything is covered with a waterproofing dimple wrap? And the dimple wrap is not working.

You can use a proper waterproofing membrane over the foam similar to a standard icf foundation – soprema makes a number of roll products that can be used to waterproof (self adhering with primers, etc).  I think the best is a product called colphene icf. 

 

It is true that trying to drain a high water table can be counterproductive (increased flows) – you basically have to build a boat. Membrane waterproofing (soprema type products) are only as good as the installation (corners, seams, etc) – so getting someone skilled with those materials is more important than the material.

 

If it was just the nexcem I would be tempted to recommend zypex as a cementious cover (less toxic) and very effective. You could look at a zypex stucco type cover with the foam but would probably fail over time.

 

Best

John

 

 

stationdesign

4465 UPHILL RD DUNCAN

BC V9L6M7 250 246 8541

 

From: Greenbuilding <greenbuilding-bounces at lists.bioenergylists.org> On Behalf Of Lynelle A. Hamilton
Sent: April 7, 2019 3:22 PM
To: Green Building <greenbuilding at lists.bioenergylists.org>
Subject: [Greenbuilding] Waterproofing a shallow frost protected foundation

 

Again, I turn to this list!

I have a shallow frost protected foundation, sitting on a high water table. Construction is SFPF, then Durisol/Nexcem with 2" of foam extending to the perimeter foam and dimple wrap. 

We temp back filled the south wall before winter approx 3.5 feet, as the septic is to the south.  Now, I have water coming in on the south wall. Not a huge amount, but enough that I don't want it! We had no water on the ground before backfill, although the seat of the septic tank (about 1.5 feet below the foundation had minor seepage when we dug it. 

I've been told not to ring the foundation with gravel and install weeping tile, due to the high water table.  I don't believe I can use tar or other paint on applications with the foam. I can't find anything relevant on the web.

Any ideas, listers? Many thanks in advance.

Lynelle

 


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