Jefe:
Always a good write up - as others I have seen on the internet from you. The blue Dow insulation/foam product you are using is indeed difficult to source. (Dow Styrofoam Blue Board rigid XPS insulation) I am wondering if anyone has experience with what might be an alternative available at HomeDepot.
Picture from Jefe's writeup
Here is a link to the "Pink stuff" at HomeDepot (
FOAMULAR NGX F-250)
Owens Corning FOAMULAR NGX (Next Generation Extruded) insulation, is produced with a proprietary blowing agent that delivers a 90% reduction to Global Warming Potential (100 year) compared to current FOAMULAR. The new formulation and production process meets or exceeds new, more stringent...
www.homedepot.com
It would
seem this product also offers the 25psi rating the blue Dow stuff you used has. Any thoughts?
Personally, I am just looking at saving some weight by getting rid of wood risers.