Dow

Styrofoam SIS structural insulated sheathing combines a structural layer, a moisture barrier, and foam insulation, providing R-values of 3.0 at 1/2 inch or 5.5 at 1 inch. It is made of up to 80 percent post-consumer recycled content by weight, and it is Energy Star-qualified. The company claims the insulation will help save between $200 and $500 per year on energy bills, and is one-third the weight of wood sheathing. "This appears to be an excellent product, providing wall bracing, energy performance, and the potential for weatherization all in one," said one judge. "The labor savings alone is huge." Cost: 4x8, $18. 866-583-2583. www.dowsis.com.