Insulating A Home Roof With A Closed Attic

Insulating in and around your roof attic space also prevents long term damage from moisture build up or ice damming which results from the warm air trying to escape through the apex of the roof but instead heating up the snow.

Insulating a home roof with a closed attic.

This construction approach was first used in the 1970s and it has been implemented much more widely since it was first included in the international code council s icc model building code in 2007 irc section 806 4. In this way you prevent the heat from the rooms below escaping to the attic rooms above. But the best solution is actually to insulate both the attic floor and the underside of the roof. With a more complete layer of insulation throughout your attic you ll experience lower energy costs and more effective heating cooling compared to simple batts installations.

Insulation entirely above the roof deck directly below the roof deck or both above and below the roof deck. This insulation strategy has not changed in recent code iterations and is not discussed in this article. Square footage of your attic. The main factors that impact the cost are.

Contractor or insulation installer s fee. Insulating your roof and attic space will help retain energy in your home often leading to cost savings and comfort improvement. Insulating a finished attic there are two basic ways to insulate a finished attic. Additionally insulation serves as a way to enhance sound proofing on the uppermost envelop of your house.

If only the living space will be insulated wrap the insulation around the room s walls and ceiling and then continue along the floor of the non living space. It is important to note when insulation is on the floor of the attic the space between the insulation and the roof deck must be vented to the exterior. Unlike blown in insulation spray foam is applied to the underside of your roof as opposed to the attic floor. Insulation tight to the roof deck i e.

Both types of insulation provide an effective air barrier but closed cell insulation can also serve as a moisture vapor barrier if that is needed. New rules and practical. Insulation on the floor of the attic figure 1. One huge benefit of the spray foam insulated attic is that conditioned air leakage from the ac furnace duct system is contained and used to condition the attic.

Then you could simply insulate the pitched roof. Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls. In this case the area behind the knee wall will be uncomfortably hot or cold. Type and material of your insulation.

When we seal the attic with spray foam it s as tight as a butter tub. However in a traditionally insulated attic insulation on the ceiling the attic is vented. Open cell spray foam insulation is roughly 1 to.