http://www.oikos.com/esb/43/roxul.html -- Lawrence F. London, Jr. mailto:london@sunSITE.unc.edu http://sunSITE.unc.edu/InterGarden mailto:email@example.comTitle: ESB: Roxul Foundation Insulation
Some builders have always preferred rigid fiberglass over foam for insulating
foundations. Fiberglass conforms to surface irregularities in concrete walls
better than foam, and is made without the chlorofluorocarbons used in extruded
polystyrene. Unfortunately, there are only two fiberglass boards left on
the market. Neither is easy to find in the U.S., and one of them forces
you to buy manufacturer's waterproofing membrane along with it. The Canadian-based
Roxul, Inc. hopes to solve the supply shortage with a new product called
Drainboard that's made not from fiberglass, but from high-density rockwool.
The material contains 50 percent recycled slag and pure basalt stone.
Drainboard does the same job as fiberglass, but in a different way. While fiberglass serves as a drainage layer, Roxul's Drainboard is more of a water barrier, like foam. It has passed a number of water intrusion tests that showed it to be at least as good as fiberglass at keeping water away from the foundation. The manufacturer claims that it performs better over freeze-thaw cycles than foam, is more dimensionally stable and stands up better over time. It also costs less.
"We like to call it the next choice above sand," says company spokesman Tyler Nelson. It's available in Canada and the Northeast U.S.
Roxul Drainboard comes in 4x6 sheets that weigh 7 pounds each and have the same insulating value as fiberglass at around R-4 per inch.
Find Roxul, Inc. in REDI 96
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