[Greenbuilding] using roxul-confessions of an old foamer

[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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