Foamular vs kingspan

[slowTA]

Are these 2 close enough that it doesn't matter which one I use? Foamular250 vs. Kingspan for under slab insulation. I will be stapling my PEX down to it.

https://www.lowes.com/pd/Kingspan-In...tion/999972968

https://www.homedepot.com/p/Owens-Co...lar250}:qu

 

[tricountytrail]

I just purchased mine 44 sheets 6 for the perimeter and 38 for floor I went checked them both out. The Owens which I had originally planned to go with at home depot was stocked with only the scored version. I looked at the lowes brand and I liked it even better! Depending on the quantity your buying stop at the pro desk ask for quote I got mine for I believe $29-$30 a sheet. Starting On it Wed!

 

[slowTA]

What's this scored version you speak of? That sounds like a great way to break off sections for the perimeter!

 

[tricountytrail]

What's this scored version you speak of? That sounds like a great way to break off sections for the perimeter!

You would not want it under when you walk on it it would crack on scores.
It is scored in either 15" or 24" section for going between studs so it would depend on what depth you are using. I will be cutting mine in 12" sections I thick it will cut easy with a skill saw or a hand saw, I will let you know.

 

[Verado1250]

The Kingspan, according to the description on the page, says that it's for walls and roofing. I don't believe, from their description, that it's suitable for under the slab. Before buying it and regretting it later, you might call the manufacturer to confirm. I used the Foamular 250. The 150 was cheaper, but this is a decision that would be impossible to correct later on. Mine came from Menards, which was a lot cheaper.

 

[tricountytrail]

GreenGuard Type IV 25 psi Insulation Board is an ideal exterior insulation, meeting your needs for multiple applications. Its extruded polystyrene (XPS) construction provides superior moisture resistance. And since it does not absorb moisture, it retains its insulating properties over time. With an R-Value of 5.0 per inch of thickness, the board increases the energy efficiency of your structures. Plus it’s lightweight, easy to handle, and easy to cut with a knife. Use this insulation for below slab, cavity wall, and foundation applications. It meets and exceeds all Type IV and Type X specifications.

It is even better than the formular 250.

 

[tricountytrail]

Ready for Stone

https://www.garagejournal.com/forum/attachment.php?attachmentid=886058&stc=1&d=1555871977

 

[slowTA]

How did you stick the insulation to the skirt board? Will you use vapor barrier or just tape the insulation seams?

 

[tricountytrail]

I used 2 1/2" screws with caps, it doesn't take much to hold them. I will level base with stone and tamp. 2" foam then vapor barrier mesh and pex. and finally 6" of Concrete.
The concrete guy suggested vapor barrier on top of foam, better for concrete and also no insulation pieces floating to the top messing up the concrete. It's funny how each trade is one sided, Electricans say tape the conduit so the stones wont get in, Plumber say tape tape the pipes so the stones wont get in. They won't either say tape them both!

 

[tricountytrail]

https://www.garagejournal.com/forum/attachment.php?attachmentid=887026&stc=1&d=1556168521

 

[slowTA]

I started cutting up mine last night! The first pass was with a good utility knife then switched to a cheap one with the blade you break off when the tip gets dull since it has significantly more reach. This stuff cuts pretty easy that way.

 

[tricountytrail]

I started cutting up mine last night! The first pass was with a good utility knife then switched to a cheap one with the blade you break off when the tip gets dull since it has significantly more reach. This stuff cuts pretty easy that way.

I used a cordless sawsall with a long thin blade, worked great.

 

[slowTA]

So how stable are your foam sheets when you put them down. My stone isn't the flattest so my foam has some spring to it as you walk over it.

I'm sure the weight of the concrete will make it contour to the stone easily enough and the bottom of the concrete doesn't care what it looks like. I just need to know how mental I need to let this make me!

 

[tricountytrail]

So how stable are your foam sheets when you put them down. My stone isn't the flattest so my foam has some spring to it as you walk over it.

I'm sure the weight of the concrete will make it contour to the stone easily enough and the bottom of the concrete doesn't care what it looks like. I just need to know how mental I need to let this make me!

I had all my stone tamped down and level no spring on mine!
Ready for concrete IF It ever stops raining!!!
https://www.garagejournal.com/forum/attachment.php?attachmentid=889545&stc=1&d=1556879712

 

[kj_mustang]

You going to put that mesh on chairs/dobis?

 

[tricountytrail]

You going to put that mesh on chairs/dobis?

That mesh is under the pec Concrete guy will place mesh on top, before pour