Homes are less expensive to build, because less materials are needed to achieve the same R-value. These materials are easier to install, reducing labor costs. Houses are more energy efficient because polyiso's thermal performance exceeds that of other common sheathing materials. The WarmWall CM system insulates the entire wall, including framing, thereby significantly reducing heat loss. Builders receive fewer callbacks, because properly insulating a structure with the WarmWall CM system can decrease condensation in the walls and reduce moisture and mildew problems.
Polyiso insulation is applied over all framing to reduce energy loss.
Conventional fiber glass insulation is installed between the studs. In heating climates a continuous vapor barrier, such as 6 mil polyethylene, is applied on the interior of the studs to keep moisture out of the wall cavities, and the exterior joints of the polyiso sheathing are taped to minimize air infiltration. A half-inch gypsum wall board is applied to the interior, and conventional siding materials are applied over the polyiso sheathing on the exterior. Wood strapping may be used over the polyiso prior to the application of some wood siding materials. An independent energy analysis firm performed a case study comparing the WarmWall CM system with exterior wall systems using non-insulating wood composite sheathing.