SPF home insulation saves on energy costs and lowers utility bills. SPF is used to seal the entire "building envelope" of your home to prevent air and moisture infiltration. The US Department of Energy (DOE) studies show that 40% of your home's energy is lost due to air infiltration. This air infiltrates the home in the form of drafts through walls sockets, windows and doorways. Often times no expensive building wrap or additional vapor protection is required during construction when using SPF, saving money yet again.