Installing insulation at the rim joists enhances energy efficiency and acts as an effective air barrier. Given its ... and is moisture resistant. Closed-cell foam is impermeable insulation.

It is considered an air impermeable insulation at a thickness of 3.5 inches. JM ocSPF insulation can be applied at up to 6 inches per pass and, when properly installed, the ...

Chilled water systems often carry water at 4.4 C (40 F), and using an impermeable insulation, like cellular glass, helps systems resist vapor drive and keeps moisture from penetrating insulation to ...

Q In your recent answer to a query about loft insulation and condensation (January 18), you said an impermeable vapour barrier should be installed. Can you explain what this is – what type of ...