Exterior, Wood, Glass, House, and Saltbox The pitched roof reduces the extension's surface area to 12 percent less than that of a flat-roofed extension, creating a more compact building envelope—which translates to less material needed for construction and less space to heat or cool.  Exterior Saltbox Glass Photos from A Contemporary Extension Gives This Australian Home a New Face

Exterior Saltbox Glass Photos

The pitched roof reduces the extension's surface area to 12 percent less than that of a flat-roofed extension, creating a more compact building envelope—which translates to less material needed for construction and less space to heat or cool.