Attic Ceiling Spray Foam Insulation

R value of 7 in 1 inch 97 closed cell foam.

Attic ceiling spray foam insulation.

If you look closely you ll see two exhaust flues on the left side. In a vented attic all of that expensive airflow is lost to the environment. Using spray foam insulation in an unvented attic application both low density open cell and medium density closed cell spray foam can be used in an unvented attic to provide the needed thermal resistance and airtightness. When we seal the attic with spray foam it s as tight as a butter tub.

Hire a pro to install spray foam insulation. The attic you see in the photo here is a different home but it does have one feature in common besides the spray foam. The installer sprayed foam directly on the metal flues. Spray foam insulation that s convenient and easy to use.

You ll also see another safety hazard and code violation. When spray foam is installed on the underside of the roof deck the attic space is insulated from heat that otherwise would be entering the attic. 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. If you re considering turning your attic into conditioned storage or living space it s worth changing tactics to insulate between the rafters and wall joists instead of the floor.

You can use rigid foam panels or do as tom silva does with nearly all houses these days. Thus the air in the attic is connected with the air in the house. The best attic insulation. Class i e 84 fire retardant meets building code spec.

It has been said that insulating with spray foam insulation at the roof line will lead to moisture problems with the roof sheathing. 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. The insulation reduces wildly high temperature spikes and so the attic becomes a conditioned part of the home like any other room. Whereas too little spray foam insulation can leave for thermal bypass because of the complete lack of insulation in the attic.

You should never do this. But a common reason to put spray foam on the roofline is to avoid having to air seal the attic floor. It will also help keep any duct leaks within the conditioned space of your attic. This will allow for optimal operation of your hvac equipment as well as aid in early detection of situations such as roof leaks and wind driven moisture intrusion.