Without the right insulation R-values, hot and cold air alike can flow right through a home’s flooring, walls, ceilings, and attic. But what exactly is R-value, and what does it have to do with ...

Say you find 14 inches of blown-in cellulose insulation, which has a typical R-value of around R-3.5 per inch, in your attic. That means your attic is insulated to about R-49, or 14 x 3.5. Keep in ...

"I recommend using spray foam insulation in your attic to get the best R-value (a material's ability to prevent the flow of heat) for your home. While expensive upfront, it will help lower your ...