tfinniii
Well-known member
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Sray foam under slab
- Thread starter tfinniii
- Start date
larry4406
Well-known member
bad link
19D2P
Well-known member
Just priced this out for my build and it will be a no brainer for me.
Material for OC Foamular 250 2.5” would be 4500 alone. No idea how many hours it’d take me to put down the material and tape/seal it up.
2.5” closed cell prepped, installed, and cleaned up 5400 in one day.
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Material for OC Foamular 250 2.5” would be 4500 alone. No idea how many hours it’d take me to put down the material and tape/seal it up.
2.5” closed cell prepped, installed, and cleaned up 5400 in one day.
Sent from my iPad using Tapatalk
lowrollin70gmc
Well-known member
I’ve seen videos on this before and it’s on my mental list of options for future builds.
Interested in opinions about it as well.
Interested in opinions about it as well.
Pntyrmvr
Well-known member
I like the continuous nature of the spray foam.
Last slab I did I used the 2’x8’ foam boards with the knobby parts that space the radiant tubing on 12” centers. It was quick and negated the tying of the tubing to the reinforcing mesh.
The time saved in laying the boards by using spray foam is going to get eaten up in tying the tubing to the mesh. And then there’s the bending over every few feet.
I’ll have to see how my back is feeling next slab.
“Talk is cheap. Whiskey costs money.”
Last slab I did I used the 2’x8’ foam boards with the knobby parts that space the radiant tubing on 12” centers. It was quick and negated the tying of the tubing to the reinforcing mesh.
The time saved in laying the boards by using spray foam is going to get eaten up in tying the tubing to the mesh. And then there’s the bending over every few feet.
I’ll have to see how my back is feeling next slab.
“Talk is cheap. Whiskey costs money.”
ford33
Well-known member
Link doesn't work for me.
What is the compressive strength of the spray foam compared to the foamular?
What is the compressive strength of the spray foam compared to the foamular?
19D2P
Well-known member
Compressive strength is identical at 25psi as long as you specify for under slab use.
Spray Jones on YouTube has a few really informative videos on the subject.
Sent from my iPad using Tapatalk
Spray Jones on YouTube has a few really informative videos on the subject.
Sent from my iPad using Tapatalk
Firebrick43
Well-known member
No foam is water proof but the reason Dow blue board is used commonly is that it is the most waterproof. It was developed for floatation foam on lifeboats and I have personally witnessed floating docks that have been in the water for a decade with maybe 10 percent water weight gain.
When blown it is in very controlled situations, both temp and mixing volumes. Spray foams are done in the field, and is done in variable conditions and applicators. I have witness personally on multiple boats and a pole barn wall that closed cell spray foam that was completely saturated.
When blown it is in very controlled situations, both temp and mixing volumes. Spray foams are done in the field, and is done in variable conditions and applicators. I have witness personally on multiple boats and a pole barn wall that closed cell spray foam that was completely saturated.
mcbane
Well-known member
I considered spray foam but couldn't find any objective studies of actual performance in place. It is just another new material with no track record, like polybutylene pipe was in the 1970s.
There is no way to be certain you have a correct install. The specs when sprayed under laboratory conditions look good but field application means a contractor who lacks skill and/or diligence could install foam that is no where near the published performance specs. And if so the error may not be visible at the time of install.
There is no way to be certain you have a correct install. The specs when sprayed under laboratory conditions look good but field application means a contractor who lacks skill and/or diligence could install foam that is no where near the published performance specs. And if so the error may not be visible at the time of install.