24 Jul '13, 9am

Grow Your Own Green ... Insulation, That Is

Grow Your Own Green ... Insulation, That Is

Harrington said they're benchmarking their product against extruded polystyrene (XPS Extruded 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. ). The advantages are that it uses natural materials, doesn't have the global warming issues associated with the blowing agents in foam insulation, and has much lower embodied energy. The main drawback is the lower R-value Measure of resistance to heat flow; the higher the R-value, the lower the heat loss. The inverse of U-factor. . XPS is about 5 per inch, and mushroom insulation ranges from 1.8 to 4 per inch, with the typical material coming in at about 3 ...

Full article: http://www.greenbuildingadvisor.com/blogs/dept/building-s...

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