[Greenbuilding] using roxul-confessions of an old foamer

[ward at buildgreen.ca]

Forgot to add that this is the specs for the drainboard.  I have used it for exterior insulation on the basement (backfilled to 7.5') and it works quite well.  Went with the XPS foam for underneath the slab

Ward Edwards
ward at buildgreen.ca

I found the following on the Roxul website.

Compressive resistance 17 KPA at 10% deformation, 40 KPA at 25% deformation 
ASTM E96

I'm not sure if that is sufficient for holding up a concrete slab

Ward Edwards
ward at buildgreen.ca

I was pleasantly surprised to learn (thanks to Mr Hedley of Roxul, NA) that
this product is available locally.  Up to this point I have been using xps
for subslab insulation, and for IRMA systems under extensive green
roofs-always with trepidation, because of vulnerability to insects, and the
petroleum component in the foam.  

 

So for those who have used roxul for these applications-how does it perform
under load?  Can you place the insulation on a masonry or concrete slab
ledge, and place the slab above?  Or does the slab need to bear on the
ledge, leaving a thermal short circuit?  I see on their website a number of
densities, plus drain board material.  But no obvious info on compressive
strength. 

 

Thanks in advance for your advice.

 

Alan Abrams, AIBD

Principal, Abrams Design Build

www.abramsdesignbuild.com

 

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