[Greenbuilding] Unifoam vs Plastispan

[Lynelle Hamilton]

I am insulating under a floating pad. The engineer has specified 25psi 
under the slab and 30 psi on outer edges. I've been looking at two 
products: Unifoam 25/30 and Plastifab 25/30. Aiming for R35 under the 
slab.  Price differential is significant (Unifoam is nearly $3000 more) 
for the house.

Has anyone had experience with either product? From the specs, Unifoam 
appears to absorb less water and has less deflection, but both are 
within the ASTM spec for the issue.

Many thanks for any insights!

Lynelle Hamilton



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