You know where to insulate, but there’s still one more thing you need to know about—vapor barriers. Well-insulated attics, crawlspaces, storage areas, and other closed cavities need to be well ventilated to prevent excessive moisture build-up. (more…)

In many existing buildings, the only economical way to improve the thermal resistance of the roof is by having insulation installation against the underside of the roof surface. This is a popular term by name of “under roof insulation”. This method has a number of major advantages, but one potentially disastrous disadvantage.

You can use various types of insulation underneath roof decks, including boards, batts, and spray-applied materials. Each type of material and each method of insulation installation involves its own set of details. These details are important. Follow the manufacturer’s instructions carefully. (more…)