How Does Attic Insulation Work?
Heat flows naturally from warmer areas to cooler ones. It does this by one of three different methods: conduction, where heat is delivered directly from one mass to another; convection, the transfer of hot air from one space to another (hot air rises, cool air sinks); and radiation, which simply means that any warm mass passes off heat toward a cooler one.
The main function of insulation is to minimize the radiation and convection effect of heat and minimize conduction. This causes our home to stay warmer in cool weather and cooler in warm weather.
What is the Best Attic Insulation Type?
There are many different types of attic insulation, but the best type depends on your climate and needs. Two things that you will be looking for is the material used such as cellulose and the r value or “resistance to heat flow.” The more extreme the range of temperatures in your area the higher insulation r value you need. You can check your local energy commission, local power company, or local home center for the best R-value in your area or consult this map and chart courtesy of the EERE of the Department of Energy.