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Closed cell spray foam not sticking to concrete walls

Posted by eoren1 (My Page) on
Wed, Feb 17, 10 at 14:30

I just had a company come out to apply 3" closed cell spray foam to our basement. The basement has been demoed so it is just concrete walls (with some nails in place that were used to adhere the fake wood paneling previously).
The guys applied 2" of foam to the concrete but, after curing, it cracked and was easily popped off the walls. The only place it stuck was near the water meter and pipes. They tried a thinner layer to see if that would stuck without success. The crew told me the walls were reading 43 degrees F right now (we just got 4" of snow last night) and they had me turn off the furnace while they worked).
The plan now is to frame up the basement leaving about an inch between the concrete and wood frame then spray foam and allow the frames to hold the foam in place.
Wondering if anyone has experienced this before or has thoughts as to why it is not sticking to the concrete. Any downside to framing first?
Thanks,
E


Follow-Up Postings:

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RE: Closed cell spray foam not sticking to concrete walls

What kind of foam???

Find out and check the spec sheets

I use WallTite from BASF, a polyurethane foam. It cannot be applied to concrete walls that have frost, snow, wetness, dust, dirt and anything else that will interfere with adhesion. It can be applied at temps from 14˚F. to 104˚ F.

I've had Walltite applied in 3" thickness behind wood framing. But I certainly don't expect the framing to hold it to the wall.


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RE: Closed cell spray foam not sticking to concrete walls

I'm pretty sure the product used was Heatlok Soy whose data sheet I just reviewed and which can be safely applied at temps of 25 degrees F. I'll confirm this with the installers in the morning.
I'm now thinking of:
1. Asking about alternative closed cell foams they may use
2. Framing and putting in all electric/plumbing work and waiting until end of March/early April to spray the foam.
E


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RE: Closed cell spray foam not sticking to concrete walls

You shouldn't have to be troubleshooting their problems. But you can always give the manufacturer a call and ask for technical information.


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RE: Closed cell spray foam not sticking to concrete walls

Talked to the company
Apparently cold cement walls are the toughest substrate to use the closed cell foam on. The reaction to 'make' the foam is exothermic and cold cement will rob a lot of the heat of the reaction and lead to the potential for loss of adhesion. Framing 2" away can help that. Alternative is to use a strong heat source against the cement first.
The rep for the company is contacting the installer on my behalf. Would prefer to have the foam applied directly rather than framing first I think.
We'll see what happens.
Thanks for the comments,
E


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RE: Closed cell spray foam not sticking to concrete walls

Did this get rectified? Seems to me you would want the framing to be in place before the spray foam anyway. Any time I have seen it applied on television they are always doing it after the rough framing. Any update appreciated.

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