The building envelope refers to the design and construction of a home’s exterior, which consists of the floor and subfloor, exterior doors and windows, exterior walls and the roof. The standard building envelope should use exterior wall materials and designs that help withstand the harsh elements, keep it structurally sound and make it visually appealing. But that’s not all, your home’s building envelope should allow for improved energy efficiency, as well. Acorn Home Improvements, an expert in siding and roof replacement, shares how to make this possible.