Insulate Roof With No Attic Space

Because most flat roofs don t have an attic crawl.

Insulate roof with no attic space. The general answer to the question of whether insulating a garage attic will lower energy costs is no at least not appreciably. In practical terms you can choose between mineral wool or insulation boards. Fill the remaining space with fiberglass or cellulose. Works well costs more.

Insulating the attic floor. This gives the best air path eaves to ridge but costs more for the labor to nail furring and cut insulation into pieces to fit between rafters. Since your home s heating and cooling system usually does not extend into the garage insulating this area does little to change the cost of running the system. By laurie brenner homes with flat roofs require a different approach to insulation than the standard approach used for homes with pitched roofs.

So insulating the floor of the attic is not only the best solution but it is also the simplest and cheapest. Water is insulation s enemy. Effects of insulating the garage attic. Materials commonly used for the insulation of the roof deck include.

Insulating the roof is a priority if the ceilings of your home happen to be part of the roof deck as is the case with cathedral ceilings. If you put cellulose up there it will help insulate but you need a vapor barrier above the ceiling because you ll have warm ceiling air hiiting colder roof surface and condensing which will turn the cellulose into a moldy mess. Box out light fixtures. For such constructions the principles and benefits of unvented attic construction are similar to that occurring in a single family residence.

If you do not use the attic much it is pointless heating this area. But spray foam insulation used at the underside of the roof deck would need to be covered by a thermal barrier and intumescent coatings are commonly used. An attic you want vented but in your case you want the ceiling roof space sealed. With 2x6 rafters this will give about an r 19 roof higher if you use thicker solid foam insulation.