Closed-cell · Open-cell · Homes, shops & barns
Spray foam insulation in Billings, Bozeman & south-central Montana
Closed-cell and open-cell spray foam installed by a licensed Big Timber crew — the tightest building envelope you can buy, with free estimates along the whole I-90 corridor.
Why spray foam
The best insulation for Montana's climate, period
Spray foam insulation is the only product that insulates and air-seals in a single pass. In a climate that swings from −30°F cold snaps to 100°F summers — with relentless wind in between — that air seal is worth as much as the R-value. Olympus Insulation installs closed-cell and open-cell spray foam across south-central Montana, from Billings and Laurel to Livingston, Belgrade, and Bozeman.
Closed-cell vs. open-cell: which one do you need?
Closed-cell spray foam cures rigid, delivers roughly R-6.5 to R-7 per inch, adds structural strength, and is its own vapor barrier. It's the right call for rim joists, crawl spaces, basements, metal buildings, shops, and anywhere moisture is in play.
Open-cell spray foam is softer and more economical per inch (about R-3.6 to R-3.8), expands aggressively to fill framing cavities, and adds sound damping. It shines in interior walls, attic rooflines, and vaulted ceilings where you have depth to work with.
| Factor | Closed-cell | Open-cell |
|---|---|---|
| R-value per inch | R-6.5 – R-7 | R-3.6 – R-3.8 |
| Air barrier | Yes | Yes |
| Vapor barrier | Yes (at 2″+) | No |
| Adds structural rigidity | Yes | No |
| Relative cost | Higher per inch — more R-value and structure | Lower per inch — budget-friendly fill |
| Best uses | Rim joists, crawl spaces, shops, pole barns, exterior walls | Attics, vaulted ceilings, interior walls, sound control |
Where spray foam pays off fastest
- Rim joists and crawl spaces — the single highest-return retrofit in most Montana homes. Stops cold floors and frozen pipes.
- Shops, garages & pole barns — closed-cell on metal or wood framing conditions the space and stops condensation drip.
- Attic rooflines — brings ductwork inside the envelope and ends ice-dam problems at the source.
- New construction walls — a flash-and-batt or full-fill approach that beats code minimums by a wide margin.
Spray foam insulation cost in Montana
Spray foam is priced by square footage, foam type, depth, and site access — and because we serve a wide stretch of Montana from Billings to Bozeman, no two jobs price exactly alike. We quote firm numbers after a free on-site measure — and we'll tell you honestly where cheaper batt or blown-in makes more sense. See our pricing & FAQ page for more detail.
Our process
Clean installs, honest depth checks
- Prep and masking — we protect floors, windows, and finished surfaces before the rig starts.
- Certified application — correct substrate temps, lift thickness, and cure times, logged on every job.
- Depth verification — we probe and photograph installed depth so you get the R-value you paid for.
Spray foam questions we hear every week
How much does spray foam insulation cost in Billings or Bozeman?
Every home and shop is different, so we don't price off a chart — cost depends on foam type, depth, square footage, and access. We give free, firm written quotes after an on-site measure.
Is spray foam worth it in Montana's climate?
Yes — more than almost anywhere. Air-sealing matters most in cold, windy climates, and spray foam is the only insulation that air-seals as it insulates. Most customers see heating bills drop 20–40%.
Can you spray foam a metal building or shop?
Absolutely — closed-cell foam on metal skin stops condensation drip, stiffens panels, and makes the building heatable. Shops and pole barns are one of our most common jobs.
How long do we need to stay out of the house?
Foam is tack-free in minutes, and we follow a standard 24-hour re-occupancy window for sprayed areas with ventilation running. Rim joist and crawl jobs usually don't require leaving at all.
Ready for a straight answer and a firm number?
Free on-site estimates from Billings to Bozeman. Most quotes delivered within 48 hours.