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Mineral Wool Boardstock Insulation Gains Ground

Roxul ComfortBoard IS has some important environmental and performance advantages over XPS and polyisocyanurate insulation

Posted on May 16 2013 by Alex Wilson

Readers of this Energy Solutions blog may be aware that I’ve been critical of some of our foam-plastic insulation materials. I’ve come down hardest on extruded polystyrene (XPSExtruded polystyrene. Highly insulating, water-resistant rigid foam insulation that is widely used above and below grade, such as on exterior walls and underneath concrete floor slabs. In North America, XPS is made with ozone-depleting HCFC-142b. XPS has higher density and R-value and lower vapor permeability than EPS rigid insulation.), which is made both with a blowing agent that contributes significantly to global warming and with a brominated flame retardant, HBCD, that’s slated for international phaseout as a persistent organic pollutant.


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Image Credits:

  1. Roxul
  2. Residential installation of ComfortBoard IS.

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Installing Mineral Wool Insulation Over Exterior Wall Sheathing

Researchers confirm that Roxul panels and furring strips can be installed on walls as a substitute for exterior rigid foam

Posted on Aug 26 2011 by Martin Holladay

A subset of green builders have always been grumpy about foam. Such builders look at rigid foam panels and spray foam as suspect products: they are made from petroleum, laced with mysterious chemicals, and impermeable to vapor flow.


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Image Credits:

  1. Building Science Corporation

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