2" vs. 1.5" for underslab insulation

[cbennett]

Would like to see thoughts on 1.5 vs 2" insulation. Guy semi local has reclaimed but in good shape 1.5" thick 25psi board for $12.50 big savings over $33.36 for 2" from Menards.

Thoughts....

 

[kj_mustang]

Reclaimed what. All foam board is not rated for under slab.

 

[cbennett]

this is what his add says

We have a nice supply of High Density blue board 4'x8'x1-1/2". This is very nice for concrete slabs, garage walls, retainer walls, crawlspaces, etc. It is a very nice recycled product and for this price it will move fast! $12.00 ea. please call Plywood King Inc

I guessing its from roofs of industrial buildings only thing I can think of.

 

[Randy in Maine]

Double them up since they are so cheap, that will give you 3".

 

[sands35]

2" XPS is typically code required.

 

[rburke65]

Typically code "required" where?

 

[MScott]

Double them up since they are so cheap, that will give you 3".

x2 Still much cheaper than the 2 inch.

 

[sands35]

Typically code "required" where?

depends on the municipality. 2" is code required in my town.