An easy and inexpensive way to insulate foundation walls has proved elusive for many builders, but CertainTeed's new Basement Wall Insulation promises to make the process faster and easier. Faced with reinforced polypropylene or foil, the insulation is available in 3/4-, 1 3/4-, and 3 1/8-inch thicknesses, with respective R-values of 3, 6, and 11. The insulation hung from the sill plate can be left exposed in most residential applications. Installed costs vary, but expect to pay about $.60 to $.80 per square foot.


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