Englewood Insulation › Attic Air Sealing
Attic Air Sealing in Englewood, CO
Houses from the coal era were built to leak on purpose. We close the chases, chimneys, and wall-tops that made sense in 1925 and cost you money in every winter since.
- Free draft-source inspection
- Fire-safe methods at every chimney
- Every seal photographed & listed
Your local crew, minutes away
Commerce City HQ · both Englewood ZIPs
Where does a 1920s house leak from?
Old-house leakage is structural, not accidental. Here’s what drives it in the Englewood homes we audit:
- Frequency across Englewood audits. Your house gets its own mapped list before any sealant opens.
TRUSTED PRODUCTS & PARTNERS
The Brands Behind Every Grizzly Install
We don’t install mystery material. Every Arvada project uses products from the industry’s most trusted manufacturers.
01THE PROBLEM
Balloon Framing Turned Every Wall Into a Flue.
Pre-1930 framing left wall cavities open from the cellar to the attic, so heated air rides your walls upward day and night, the stack effect with a dedicated lane. Capping those cavities from the attic is the highest-value hour of work an Englewood bungalow can buy.
AWall tops open to the attic sky
Look down a bungalow’s wall cavity from the attic and you can see cellar light. Every one of those open tops leaks like a chimney, we block and foam them all, the fix these houses have waited a century for.
BChimneys carrying more than smoke
Masonry chimneys run through framed openings sized generously in 1925. Warm air pours up the gap between brick and framing, we close it with metal flashing and fire-rated sealant, clearances respected, never bare foam on a flue.
CA century of ceiling surgery
Gas conversions, electrical retrofits, bathroom fans, every decade cut new holes toward the attic and sealed none. The plaster around each cut cracks with age, multiplying paths upward.
DHatches from the ladder-and-push era
Original attic hatches are a board in a hole, no gasket, no insulation, no latch. Rebuilding one takes an hour and outperforms almost any other sixty minutes spent on an old house.
02THE FIX
Seal the Era Out. Keep the House Original.
Standalone sealing sharpens a bungalow immediately; sealing before insulation multiplies the whole project. The audit tells you which your house needs:
03WHAT TO EXPECT
A Morning in the Attic, a Century of Gaps Closed.
The sequence of an Englewood sealing visit:
Every wall top, chase, and fixture gets located and logged from the attic side. Balloon-frame homes get their full cavity map before anything is sealed.
Whatever thin material exists gets moved aside at each leak point and returned after, nothing leaves unless it is contaminated.
Rigid blocking caps each open wall cavity before foam locks it; the chimney gap gets metal flashing with fire-rated sealant; fixtures get airtight covers.
Gasket, rigid insulation, and a positive latch turn the original board-in-a-hole into the tightest square foot of the ceiling.
Every capped cavity and sealed penetration goes into a photo ledger for your records, proof of exactly what a century left open and we closed.
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 Air Sealing Costs in Englewood
The best return-per-dollar work an old house can buy. Four price drivers, itemized after a free audit.
Cavity count
How many balloon-frame wall tops need capping
Chimney work
Flashing and fire-rated detailing at masonry
Ceiling condition
Plaster crack networks and fixture cuts
Hatch rebuild
Gasket-and-latch or full insulated rebuild
Three ways the net cost drops
Xcel Energy rebates
Air sealing is a rebated measure in Xcel territory, and pre-war homes post the biggest measured gains.
Federal 25C tax credit
30% of qualifying insulation costs, up to $1,200 per year, under the Inflation Reduction Act.
Radiators finally win
Stop feeding the stack effect and the heat your system makes actually stays on the floor it was made for.
★ ★ ★ ★ ★
"You could feel air moving up the walls of our 1921 four-square by the medical district. They capped nineteen open cavities and flashed the chimney gap in one morning. The ground floor stopped being the cold floor."
F
Frank O.
Homeowner · Medical District, Englewood · Attic Air Sealing
05QUESTIONS
Air Sealing in Englewood, Answered Straight
They were engineered that way. Coal heat needed draft, so balloon framing left wall cavities open top to bottom and chases ran generous. Modern furnaces inherit that ventilation as pure loss. Sealing retrofits the 1920s logic without touching the character.
It is modest work with outsized returns: priced by cavity count, chimney detailing, ceiling condition, and hatch scope. Pre-war homes have more to seal than newer ones, and correspondingly more to gain. The audit produces a written, itemized number.
It is the pre-1930 method where wall studs run unbroken from foundation to roof, leaving cavities open the full height of the house. Those cavities behave like flues, pulling heated air upward constantly. Capping them at the attic is the defining air-sealing move in Englewood’s housing stock.
Only with the right materials, which is the point of hiring it done. Combustion clearances get respected with metal flashing and fire-rated sealant; expanding foam never touches a flue on our jobs. Fire-safe detailing is where old-house sealing earns its keep.
Most Englewood homes seal in half a day; four-squares and homes with heavy chase work can run a full day. It is quiet attic work, you stay home, nothing in the living space is disturbed.
Not from ceiling sealing, these homes leak generously everywhere else. We are closing the most expensive leaks, not hermetically sealing the house. Ventilation stays healthy; only the heat-theft stops.
06EVERY COMMUNITY WE SERVE
Attic Air Sealing Near Englewood
DenverArvadaLakewoodEnglewoodCentennialLittletonGoldenGreenwood VillageBoulderLafayetteHighlands RanchLouisvilleErieEvergreenCastle Rock
07GET STARTED
Retire the Coal-Era Draft Plan.
Free audit with a mapped list of every open cavity and chase. Fire-safe sealing, photographed proof, done in a morning.
- (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 Arvada
Get Your Free Draft Audit
Takes 30 seconds. We reply within 24 hours.