Adding insulation to a typical home’s attic, flooring, basement, and crawl spaces can lower total energy costs by an average of 11 percent if you also plug unwanted air leaks. That’s partly ...

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 ...

Depending on your home, it's possible to add insulation to your roof, walls, floors and loft, along with draughtproofing ... so insulating any loft, attic or roof space is particularly important.

That means your attic is insulated to about R-49 ... and rafters in ceilings, floors, and walls. Insulation sold in barrel-like rolls must be unspooled and cut to fit using a utility knife.