Air Sealing Services in Kalispell & the Flathead Valley, MT

In western Montana's cold, establishing an airtight barrier is crucial for eliminating the stack effect. Warm air rises and escapes through gaps at the top of the house, and as it leaves it pulls freezing air in through gaps at the bottom. The colder it gets outside, the stronger that pressure difference becomes, which means the leakage is worst exactly when you need the house to hold heat.

A home can carry code-compliant insulation everywhere and still lose heat this way. The insulation is doing its job and the air is going around it.

Air sealing is best accomplished using closed cell spray foam, which offers a high R-value of approximately R-7 per inch and acts as its own vapor barrier. We prioritize it heavily for high-moisture zones like the crawl space, rim joists and the underside of the roof deck, where a material that handles air, thermal and vapor control in one pass removes several chances for something to go wrong.

To balance performance and budget we often build a combined strategy, running closed cell foam as the control layer and adding fiberglass, mineral wool or open cell spray foam over it for additional R-value and sound dampening. This gets you the airtightness where it matters most without foaming the entire building.