Air Seal Attic Joysts Spray Foam

When we seal the attic with spray foam it s as tight as a butter tub.

Air seal attic joysts spray foam.

Unvented attic assemblies unvented attics rely on an air impermeable insulation installed to the roof deck s underside i e. Clean product from the dispenser with a cloth and apply petroleum jelly one last time. When properly applied to a thickness of one inch or more spray foam insulation is an effective air barrier preventing air leakage that creates drafty conditions and reduces energy efficiency. Move in a steady stroke around the joist.

Closed cell spray polyurethane foam spf is an excellent choice for insulating attics and rim joists. Push down on the ejector to remove the nozzle once spraying is complete. Hold the insta flow dispenser at least 6 inches from the spray area and pull the trigger when ready. Keep in mind that foam cures in just 30 60 seconds.

In a vented attic all of that expensive airflow is lost to the environment. Closed cell spf is an effective thermal air moisture and vapor barrier. Attic ceiling to stop airborne moisture from reaching a cold surface and condensing inside the building envelope in this design insulation effectively separates the interior and exterior spaces while slowing down moisture flow so the dewpoint is not achieved within. Again cover with insulation when you re done.

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. Fold the bag over and stuff it into the open joist space under the wall a piece of rigid foam board sealed with spray foam also works well for covering open joist cavities. When spray foam insulation is applied to your attic then you will create a fast seal thanks to the expansive nature of this product.