Attics · Walls · New construction
Batt & blown-in insulation across the Billings–Bozeman corridor
Fiberglass batts and blown-in attic insulation installed to real, verified depth — the most cost-effective way to cut Montana heating bills.
Proven & budget-friendly
Batt and blown-in insulation done right
Fiberglass batt and blown-in insulation are still the workhorses of Montana construction — when they're installed correctly. Olympus Insulation installs batt insulation and blown-in fiberglass and cellulose for new homes, remodels, and attic top-offs from Billings to Bozeman, with the fit-and-finish detail that separates an R-49 attic on paper from one that actually performs at −20°.
Poor installation quality is the number one problem we find in existing homes: compressed batts, gaps around wiring and boxes, missing baffles, and attics that were "insulated to code" fifteen years ago and have settled well below it. Every job we do is gapped, split, and fitted around obstructions — not stuffed.
Attic blown-in: the fastest payback in home energy
If your attic is below R-49 (about 14–16 inches of blown fiberglass), topping it off is usually the cheapest energy upgrade you can buy. A top-off typically pays for itself in a handful of heating seasons. We air-seal top plates and penetrations before we blow — because insulation over air leaks is a filter, not a blanket.
| Location | Montana recommendation | Typical product |
|---|---|---|
| Attic | R-49 – R-60 | Blown fiberglass or cellulose |
| 2×6 exterior walls | R-21 – R-23 | High-density batts |
| Floors over crawl space | R-30 | Batts with support |
| Basement walls | R-15 – R-19 | Batts or closed-cell foam |
New construction & remodel packages
Building between Billings and Bozeman? We work with general contractors and owner-builders on complete insulation packages — batts in the walls, blown-in overhead, and spray foam where it earns its keep (rim joists, cantilevers, tricky corners). One sub, one schedule, code-compliant certificates for your inspector.
Batt & blown-in insulation cost
Every attic and wall package is priced from a free on-site measure — existing depth, target R-value, and access all move the number, so we don't quote off a chart. Estimates are free and firm.
What you get
Details that make the R-value real
- Air-sealing first — top plates, can lights, and penetrations sealed before any insulation goes in.
- Proper baffles & ventilation — soffit-to-ridge airflow preserved to prevent ice dams and moisture.
- Depth markers & certificates — documented installed depth and coverage for inspectors and your records.
- Clean job sites — machine-blown through a hose, not a mess through your house.
Common questions
How much insulation should my attic have in Montana?
R-49 to R-60 — roughly 14 to 17 inches of blown fiberglass. Most homes we inspect between Billings and Bozeman are sitting at R-19 to R-30, which means a top-off pays back fast.
Blown-in fiberglass or cellulose — which is better?
Both perform well when installed to depth. Fiberglass resists settling and moisture; cellulose is denser and quiets a house. We install both and will price both if you want to compare.
Can you insulate just one problem room or addition?
Yes. Cold bonus rooms, additions, and garage conversions are common calls. We'll diagnose whether the fix is batts, blown-in, or a small spray foam detail.
Do you handle new construction insulation for builders?
Yes — full packages with scheduling, code certificates, and combined batt / blown / spray foam scopes. We serve builders along the whole I-90 corridor.
Ready for a straight answer and a firm number?
Free on-site estimates from Billings to Bozeman. Most quotes delivered within 48 hours.