Spray Foam Attic Floor Or Ceiling

Earlier this year i got a question about a home that had spray foam insulation in the attic.

Spray foam attic floor or ceiling.

It offers an air tight barrier. If you leave the insulation in the attic floor after insulating the roofline the attic will be cooler in winter than if you remove the insulation. Thus the air in the attic is connected with the air in the house. Repair any leaks remove active knob and tube wiring and remediate any hazardous materials.

Unvented attics sometimes called sealed enclosed or encapsulated attics feature insulation on the underside of the roof decking rather than on the attic floor. Nothing unusual about that. A lot of builders and homeowners are going with spray foam insulation because of the airtightness benefits but then the questioner mentioned that the spray foam contractor had intentionally left big holes to the outside by not sealing the gable vents. When we seal the attic with spray foam it s as tight as a butter tub.

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. Before any retrofit work is done inspect the roof and attic. This foam can be placed around light fixtures electrical outlets windows and doors attics and crawl spaces. That gives you the chance to maximize your energy bill savings while spending the least on the project.

But a common reason to put spray foam on the roofline is to avoid having to air seal the attic floor. The unvented attic space is considered the most effective and up to date building practice particularly by the spray foam industry. Polyurethane or polystyrene spray foams can provide thorough coverage to roof rafters and attic walls in much less time than is needed for other materials. Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly.

Spray foam insulation spray foam insulation is a highly efficient insulation product commonly used in residential commercial and industrial applications. Then you can use other forms of insulation like fiberglass or cellulose to add r value now that you have a tight air seal. The best part of using foam it green spray foam on an attic floor is you only need 1 inch cured thickness to seal the living spaces you use from the attic. Spray foam insulation is an insulating air barrier material that works by sealing the walls floors and ceiling cavities from airflow.

Greenguard in winnipeg shares some information on these two options and why spray foam is the superior choice.