Longmont Insulation › Blown-In Insulation
Blown-In Insulation in Longmont, CO
In Longmont, Old Town Victorians and bungalows to Prospect builds, the top floor bakes in summer and forms eave ice dams. Blown-in restores even, full-depth attic coverage.
- Free attic depth inspection
- Itemized quote, no pressure
- Xcel rebate guidance
Your Front Range crew
Based in Commerce City, serving Longmont and the metro
Where does your attic actually stand?
Real attic R-value depends on even depth and full coverage across the whole floor, and Longmont’s foothills wind makes wind-washed, patchy loose-fill a more common problem here than in more sheltered parts of the Front Range. We build every attic to the Climate Zone 5B target of R-49 to R-60, with coverage that holds up against that wind rather than just looking sufficient near the hatch.
- Measured during free inspections across Longmont housing stock. Your exact number comes with your assessment.
TRUSTED PRODUCTS & PARTNERS
The Brands Behind Every Grizzly Install
Every Longmont attic gets the same trusted, code-recognized cellulose and fiberglass loose-fill, nothing unmarked, nothing generic.
01THE PROBLEM
The Attic Problems Blown-In Insulation Quietly Solves.
Longmont’s attics fall into two camps: Old Town Victorians and brick bungalows near St. Vrain Creek with original insulation that’s settled and thinned over generations, and newer Prospect homes insulated to code minimums that were never topped off. Add the near-constant foothills wind, which wind-washes loose-fill near the soffits and leaves gaps exactly where eave baffles should be protecting it, and you get upstairs rooms that overheat in summer and ice dams that build up fast after a St. Vrain Valley snow. In almost every case it traces back to under-depth or gappy attic insulation and unsealed air leaks, not the furnace working too hard.
A · Attics still sitting at an old R-19 to R-30
Bonus rooms and home offices framed above an attached garage sit over unconditioned space, so heat drains through the floor while the garage pulls it away below. You get cold floors, a room running 10–15° off the rest of the house, and a furnace that never catches up. We insulate the floor joists, knee walls, and sloped ceilings, then air-seal the garage ceiling and rim.
B · Loose-fill that has settled, thinned, or gone flat
Most Longmont basements, the brick ranches east of Wadsworth, the split-levels around Lake Arbor, have bare concrete or block foundation walls. Finishing that basement without insulating the walls first buys you a cold, clammy room and a heating bill to match. Blown-Ins in the new stud walls, with the correct vapor retarder, turn it into comfortable, usable square footage.
C · Bare patches, gaps, and wind-washed eaves
Additions, pop-tops, and finished attic conversions are often framed to the minimum of their day, or never insulated in the walls at all. That leaves one part of the house always chasing the thermostat. Filling the wall, floor, and rafter cavities with properly sized blown-in insulation brings the new space up to the same comfort as the original home.
D · Ice dams and a top floor that never holds heat
Insulation isn’t only about temperature. Blown-Ins packed into interior walls and between floors cut the sound that travels between a media room and the bedrooms, an office and the living room, or upstairs and down. Mineral wool does this best. It’s a small add during a remodel that quietly changes how the whole house feels.
02THE FIX
Cellulose or Fiberglass. One Honest Recommendation.
We start with a real attic inspection, measuring existing depth, checking for wind-washing damage near the soffits, and finding where conditioned air is leaking around wiring, the attic hatch, and top plates. We air-seal those points and set fresh eave baffles that can actually stand up to Longmont’s wind, then recommend dense-packed, borate-treated cellulose or wind-resistant, settle-proof fiberglass depending on what your attic needs.
03WHAT TO EXPECT
A Half-Day Inside. Here's How It Goes.
A typical Longmont blown-in job moves from inspection through air-sealing, baffle installation, the blow-in, and a final depth-check across the attic floor, usually done in a few hours from first knock to finish.
We confirm the plan from your assessment, then protect floors and finishes around the work area.
We air-seal top plates, can lights, and the attic hatch, then set baffles at the eaves so airflow cannot wind-wash the new insulation.
Loose-fill is machine-blown evenly across the attic floor to the marked depth, filling every gap around joists, ducts, and penetrations.
We check coverage against depth-ruler cards staked across the attic so you hit the rated R-value corner to corner.
We vacuum up, haul away offcuts, and walk every cavity with you before we leave.
The Grizzly 100% Guarantee
If the work isn't right, we make it right. That's the reputation we've built across the Front Range, and it's our only sales pitch.
04COST & SAVINGS
What Blown-In Insulation Costs in Longmont
Longmont attic pricing depends on attic square footage, how much depth is needed to hit your target R-value, the scope of air-sealing (often more involved on wind-exposed roofs), and whether existing insulation is soiled or matted enough to need removal. We break all of that out in an itemized quote before starting.
Attic square footage
The attic floor area we cover to target depth
Current attic R-value
How far your attic sits below the Zone 5B target
Air-sealing & baffles
Top plates, can lights, hatch, and eave baffles
Removal needs
Only if material is soiled or damaged
Three ways the net cost drops
Xcel Energy rebates
Qualifying insulation + air-sealing upgrades earn utility rebates across Longmont. We flag what applies in your estimate.
Federal 25C tax credit
30% of qualifying insulation costs, up to $1,200 per year, under the Inflation Reduction Act.
Lower bills, every month
Heating and cooling dominate Front Range energy bills, and unconditioned walls and floors are among the highest-impact upgrade point in most Longmont homes.
★ ★ ★ ★ ★
Our brick bungalow in Old Town Longmont had a second-floor bedroom that never cooled down in summer, and the wind up here made it worse in winter, cold drafts right through the ceiling. Grizzly found the eave baffles were basically gone and the insulation had blown thin near the edges. They rebuilt the baffles, air-sealed the attic, and topped it off, and that room finally holds temperature.
D
David R.
05QUESTIONS
Blown-In Insulation in Longmont, Answered Straight
Prefer to just ask?
Call the crew that’s going to be up in your Longmont attic, (303) 854-6221, for a free, no-pressure assessment.
Blown-in insulation is loose-fill cellulose or fiberglass machine-blown across the attic floor to a measured, even depth, filling every gap around framing and penetrations. It’s specific to attics, not the walls, where batt insulation is typically used, which makes it well-suited to both Old Town Longmont’s older attics and Prospect’s newer roof lines.
Both materials work, and the right pick depends on the attic. Cellulose dense-packs well and helps seal small gaps common in older Old Town framing, while fiberglass resists wind-washing better near exposed soffits and won’t settle over time, a real consideration given how much wind Longmont gets off the foothills. We inspect first and give a single, honest recommendation.
Usually, yes, we can blow new insulation directly over existing material as long as it’s dry, uncontaminated, and not compacted flat. If wind-washing or age has left it damaged or matted, especially near the soffits, we’ll recommend removing that section before adding new insulation.
Longmont sits in Climate Zone 5B, where the attic target is R-49 to R-60, generally around 14 to 17 inches of evenly distributed loose-fill depending on the material. Wind-exposed sections near soffits often need extra attention to hit that depth consistently.
Yes, loose-fill insulation settles somewhat in its first year, and in Longmont it also loses ground to wind-washing near soffits and eaves, which can strip depth in exposed spots faster than settling alone would. That’s why periodic depth-checks and solid eave baffles matter more here than in more sheltered locations.
Blown-in wins for attics with irregular framing, existing insulation to top off, or wind exposure near the eaves, which describes a lot of Longmont roofs from Old Town to Prospect. Batts are a better fit for open, accessible wall cavities, and spray foam justifies its cost in unvented roof assemblies where air-sealing and moisture control matter as much as raw R-value.
06EVERY COMMUNITY WE SERVE
Blown-In Insulation Near Longmont
LongmontAuroraBoulderBrightonBroomfieldCentennialColorado SpringsCommerce CityDenverFort CollinsGreeleyHighlands RanchLakewoodLittletonLovelandParkerThorntonWestminster
07GET STARTED
Find Out How Much Heat Your Attic Is Losing.
Every job comes with our 100% guarantee, plain and simple.
- (303) 854-6221 · Mon–Sat 8 AM–5 PM · Sun by appointment
- info@grizzlyinsulationco.com, fast replies, usually same day
- 7140 Ivy St Unit B, Commerce City, CO 80022, 10 miles from Longmont
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