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Old 08-04-2011, 09:39 PM   #16
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Will spray foam stick to concrete?


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Originally Posted by Red Squirrel View Post
Can't see why. All I know is that the energy conservation type people would love that. Will probably cut my gas bill in half this winter. When I'd stick my face in there, I could actually feel cold air rushing in and hot air rushing out, it was like a convection effect.

The pro who did it did mention that it's flammable, but that was per code because it's an enclosed room. Even if it was to go into flames, it's an enclosed fire proof room, the fire would not go far. In fact it would probably just run out of air and stop burning.

Though I could probably build a fire resistant door in the opening. Worse case if someone did have an issue I could probably just drywall it all. Not sure how I'd do the ceiling though, just plaster? lol
In Connecticut spray foam has to be covered in concealed spaces (crawl spaces and attics. It's irrelevants the substrate it's attached to or whether there is "no air". The reason is that it is extremely flammable and when it burns it emits extremely toxic fumes. There is also the potential that it could burn hot enough that the "non-flammable" concrete could fracture and fail. Might be worth in inquiry to your insurance and local codes.

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Old 08-04-2011, 09:40 PM   #17
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Will spray foam stick to concrete?


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Will it stick to poly sheeting?
Read the technical documents for the spray foam you are interested in using. It should have the substrate requirements listed. If not, give the technical department a call, they'll tell you right away.
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Old 08-04-2011, 11:50 PM   #18
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Will spray foam stick to concrete?


It won't stick to poly. The more I look at it the less sense it makes financially. It would cost $1800 to put 3 inches on my basement. So what should I do instead? I don't have wetness in my basement, but there's definitely some vapor. When I drywalled another section some of the dust got moldy. Is that abnormal for a basement? Does it mean I have too much moisture?
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Old 08-05-2011, 12:14 AM   #19
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Will spray foam stick to concrete?


What about xps applied directly to the concrete wall and taped at all the seams? Using Great Stuff in and gaps. Would that be a safe way to use a vapor barrier in a basement?
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Old 08-05-2011, 07:19 AM   #20
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Will spray foam stick to concrete?


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What about xps applied directly to the concrete wall and taped at all the seams? Using Great Stuff in and gaps. Would that be a safe way to use a vapor barrier in a basement?
One foam or the other - you are going to have to look into the code issues about covering it.
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Old 08-05-2011, 07:36 AM   #21
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Will spray foam stick to concrete?


Call the Foam-It-Green company and get their advice.
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Old 08-05-2011, 10:35 AM   #22
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Will spray foam stick to concrete?


I mean no spray foam, just xps. Will it act as a vapor barrier?
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Old 08-05-2011, 11:25 AM   #23
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Will spray foam stick to concrete?


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I mean no spray foam, just xps. Will it act as a vapor barrier?
Rigid foam is essentially the same as spray foam once installed. Dow XPS has 1.5 perms/in so is .75 perms at 2" which is a class II vapor retarder. You can buy polyiso rigid boards which will mimic the performance characteristics of closed cell sprays.

What Leah mentioned is that rigid foam and spray foam are the same in the eyes of the code. Thermal and ignition barriers may still need to be applied to meet your local codes. In Connecticut they are required.
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Old 08-05-2011, 11:44 AM   #24
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Will spray foam stick to concrete?


Ok, what about rigid foam with 6 mil poly over it? Is that a bad idea?
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Old 08-05-2011, 11:53 AM   #25
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Will spray foam stick to concrete?


I personally don't like vapor barriers in basements...but there are plenty that will argue otherwise...

Problem for me is that if moisture is there then it is coming from outside the concrete, be it under slab or the other side of your wall. If the source is dealt with then there is will be no need for a vapor barrier and the system can breath to dry out what little moisture there may be residual. Putting a vapor barrier on the interior only masks the source and traps the moisture, and i feel it will eventually find it's way through....
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Old 08-05-2011, 12:00 PM   #26
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Will spray foam stick to concrete?


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I personally don't like vapor barriers in basements...but there are plenty that will argue otherwise...

Problem for me is that if moisture is there then it is coming from outside the concrete, be it under slab or the other side of your wall. If the source is dealt with then there is will be no need for a vapor barrier and the system can breath to dry out what little moisture there may be residual. Putting a vapor barrier on the interior only masks the source and traps the moisture, and i feel it will eventually find it's way through....
I'm also on the side of dealing with surface water (or other moisture) problems before the water gets into the basement. But I also think houses are too 'sealed-up'.

Mike, unless you are trying to make the basement living space, why not just invest in some surface water management and a dehumidifier?
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Old 08-05-2011, 12:33 PM   #27
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Will spray foam stick to concrete?


The basement will be half gym and half living room/tv room. I just want a nice hangout spot. It gets a little humid in the summer, isn't that normal? Concrete is like a sponge so isn't it expected to be a little humid? I was just hoping to seal it off so I wouldn't need to bother with a dehumidifier. I used radon seal a couple of weeks ago. No clue if it actually does anything, but we'll see. So far I'm pretty sold on the rigid foam against the concrete. Should I bother with insulation? If so, whats my best bet to avoid it molding. Something reasonably priced. Thanks for all of the help!
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Old 08-05-2011, 12:51 PM   #28
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Will spray foam stick to concrete?


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The basement will be half gym and half living room/tv room. I just want a nice hangout spot. It gets a little humid in the summer, isn't that normal? Concrete is like a sponge so isn't it expected to be a little humid? I was just hoping to seal it off so I wouldn't need to bother with a dehumidifier. I used radon seal a couple of weeks ago. No clue if it actually does anything, but we'll see. So far I'm pretty sold on the rigid foam against the concrete. Should I bother with insulation? If so, whats my best bet to avoid it molding. Something reasonably priced. Thanks for all of the help!
First, what condition are your gutters in? Is the ground around your home sloped away from the house? It's just good homeownership to make sure that rainwater is contributing to your problem. 'Sealing' up a basement wall isn't going to necessarily remediate the humidity - it depends on where they humidity is coming from.

How humid, is humid? Get a cheap hydrometer and find out how humid it is. wallmart/hardware store will have cheapo analog ones that will give you an idea.

IMO, if your humidity problem is not from water intrusion then it would be a lot easier/cheaper/less risky to install and run a couple of good dehumidifiers than to try to seal up the basement.

How 'bout some pics of what you've got currently. And fill us in on the plan. Are you planning on finishing the area as 'living space' (drywall, flooring etc)?You should start reading up on local codes and requirements, they may dictate how you handle the insulation issue.

And lastly, if you get this home improvement properly permitted and inspected than you will not put your HOer insurance at risk, you will add to the value of your home, and you will legally be able to sell the home with the increase in improved square-footage. Win-win.
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Old 08-05-2011, 02:18 PM   #29
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Will spray foam stick to concrete?


Don't have pics at the moment, but it's nothing special. Just a plain rectangular room about 16.5x30 with 9 foot ceilings. Poured concrete on 3 sides and floor.

Gutters are clean and grading is good. I'm friends with all of the inspectors so they took special care of us when the house was being built. Probably annoyed the builders, but oh well.

It will be a gym and living room. Drywall and engineered wood floors. Nothing crazy.
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Old 08-05-2011, 02:53 PM   #30
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Will spray foam stick to concrete?


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Originally Posted by Red Squirrel View Post
Can't see why. All I know is that the energy conservation type people would love that. Will probably cut my gas bill in half this winter. When I'd stick my face in there, I could actually feel cold air rushing in and hot air rushing out, it was like a convection effect.

The pro who did it did mention that it's flammable, but that was per code because it's an enclosed room. Even if it was to go into flames, it's an enclosed fire proof room, the fire would not go far. In fact it would probably just run out of air and stop burning.

Though I could probably build a fire resistant door in the opening. Worse case if someone did have an issue I could probably just drywall it all. Not sure how I'd do the ceiling though, just plaster? lol
because the fire inspector people dont love it in some places, and it is specifically forbidden. And if god forbid a neighboor lands a firecracker on your roof and your insurance denies the claim b/c their policy states "no uncovered foam"

btw, it is not a sealed room from the looks of the giant hole in the wall you took pictures through, lol....the toxic fumes are an issue too.

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