Attic Insulation

One of the positives about spray foam is that the insulation itself is air resistant. The gas or air which does the majority of actual insulating is trapped in bubbles inside the plastic foam matrix and can’t be washed out by air flow.  As the influence of air leakage on a building's energy consumption is recognized, the SRM building is designed to try to get the building as “air-tight” as possible. Installing spray foams where air is leaking through the building envelope can reduce that flow rate.

The design of the SRM building turned to a hybrid insulation systems often referred to as flash and batt insulation. To fill the empty roof assembly cavity, a  flash coat of closed cell foam was applied  to the interior side of  the roof to a thickness of 3 inches, and  then a low density  batt was installed to fill in the space before the edge of the truss members. The result is the best of both worlds –  high R-value of the fiberglass batt combined with the air tightening effects of spray foam!

The flash coat of foam is installed first.

Batt insulation is applied over the foam.