A Guide to Insulating Your Home or Business

Air Sealing

US Department of EnergyBefore you add any insulation to your home you will want to consider air sealing. It is estimated that the typical home owner can save 10% on their annual energy costs before adding any insulation by properly sealing air leaks. Don't assume you don't need to air seal because you don't have obvious holes in your walls or ceilings. To learn about the simple concept of air sealing visit our Air Sealing Discussion Forum.


Insulation keeps your home warm in the winter and cool in the summer. When correctly installed after air sealing, insulation can deliver comfort and lower energy bills during the hottest and coldest times of the year.

Insulation performance is measured by R-value — its ability to resist heat flow. Higher R-values mean more insulating power. Insulation works best when air is not moving through or around it. So it is very important to seal air leaks before installing insulation to ensure that you get the best performance from the insulation. To learn about the simple concept of home insulating visit our Insulation Discussion Forum.