Waterproofing outside of poured concrete basement walls

JB4310 · Mar 27, 2011

Any of the asphalt based materials should be pretty comparable. Application might be a PITN, on production jobs they spray it on. for DIY you'll probably roll it. I've never done it myself, so I can't really recommend any technique.

That foundation coating is very similar to double coverage roof cement, some is marketed as both. I've used it for roofing but never used it on horizontal wall before, it is sticky and pretty thick I can only imagine that it would be a bear to roll on the wall uniformly.

I would be super extra cautious back filling that high, relatively thin walls.

That is a deep excavation, I would use 6 inch or two 4 inch perforated pipes set in 3/4 or 1 inch trap stone, below the top of the footing cover by 12 inches of stone and a filter fabric over that, I don't recommend a sock over the pipe. If you could get the pipe lower it would help drain those stone filled trenches under the footing.

JB

MarkV · Mar 27, 2011

After spending that much on a poured wall have someone spray a waterproofing product on the walls,asphalt or rubber based. It will be so much better than any home center roll on treatment and you only get one chance to do it. You show a lot of rock in your photo, no way you will backfill without rock hitting and compromising your waterproofing material. Around here we spray and then apply 1/2 inch foam panels to protect the coating from backfill. It also adds some "R" value.

Your build is getting started Bruce. Exciting times.

MarkV

BruceWard · Mar 27, 2011

We used all of the rock that came out of the excavation to build retaining walls or buried it under the driveway. I will be buying material to back fill. The rock that came out was too chunky to be used for back fill.

boggen · Mar 28, 2011

Pond Coatings, Sealers, and Liner Options

granted posting is for pond liners, but it lists a good amount of different type of spray on, painted on, type of liners.

granted you will more likely pay more for stuff rated for pond use. but there are many other type of similar products out there on the market.

they spray on liners, were a company comes out and uses there expensive spray gun and machine to spray on a membrane on basement walls, will be a little higher but. they would be able to go right over any holes from the wall form ties.

the paint on type membranes will more than likely take 2 coats. perhaps a base layer and then a final layer, some may require up to 4 coats total.

regular sheets of liner, you have epdm, pvc, and ... i want to say ABS but it has been to long ago. epdm is higher dollar stuff. but you might get away with pvc style pond like liner or in your case i should say long 10' to 15' wide sheets by 10' 20' 30' 40' 50' 100' 200' long sheets.

NOTE: spray on liners and paint on liners errr membranes, if you do not prep the surface correctly can cause bubbling and flaking of the material. and for some DIY'ers for ponds has lead to undesirable effects. but for a basement wall. i don't know it might be worth it, and it might not be worth it for DIY vs having pro coming in and doing it correctly.

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some other things to google would be.... liquid or spray on truck liner beds, spray or painted on roofing tar or membranes or liners.