For wall and ceiling contractors, implementation of the energy code will have a dramatic effect on the construction of exterior wall assemblies. No longer will insulating the exterior walls simply consist of installing an R-30 batt insulation between studs. Batt insulation helps to insulate the wall but does nothing to prevent the heat loss from window systems and little to compensate for the thermal break from light gauge metal studs.
One of the primary goals of the energy code is to take measures to prevent the loss of heat from the building structure. To meet the new energy code, buildings will have to achieve a U-factor predicated upon their specific region/climate zone. A U-factor is a rating based on how much heat loss a system allows. U-factors generally range from 0.2 (very little heat loss) to 1.2 (high heat loss). The U-factor is the inverse of the R-value, which measures insulating value. One of the most effective means of achieving a low U-factor and minimizing heat loss from thermal conductivity in the wall assembly is by installing continuous insulation outboard of the metal studs or sheathing.