Fast, Reliable Blown-In Insulation Across Kirby
Blown-in insulation in Kirby, TX typically costs between $1,800 and $4,200 for a full attic retrofit, and most jobs are completed in a single day. We’re Envelope Insulation Co., and our crews are in Kirby regularly - it’s a quick dispatch from our San Antonio office, and we know the housing stock here inside out. If your home was built between the 1950s and 1970s, the odds are high that your original attic insulation has collapsed below R-7 and your crawl space is vented wide open. Call (830) 549-6646 for a written price before any work starts.
Why Envelope Insulation Co. Is Kirby’s Preferred Blown-In Insulation Contractor
We’ve sealed and insulated more than 9,000 homes since 2016, and Kirby’s post-war tract homes represent some of the most consistent retrofit work we do. The housing here is concentrated in small, single-story pier-and-beam structures originally built for workers near the eastern San Antonio industrial and military corridors. That means we don’t guess at what’s in your attic - we know before we arrive.
Our Blown-In Insulation team treats Kirby as a core service area, not a distant add-on. Response time is typically same-day or next-day for estimates, and we dispatch crews from our San Antonio office without the scheduling delays you get from contractors based farther out in the metro.
Every Kirby job closes with a Documented Photo Record and, on applicable work, before-and-after blower-door numbers - a pressurization reading that shows, in one figure, how much conditioned air your home was losing before and after the crew finished. Under Haven Standard Clause 1, you get a written price, written scope, and written warranty before anyone lifts a tool. The 365-Day Done Right Promise applies to all completed work.
Our Blown-In Insulation Services in Kirby
Blown-In Cellulose
Cellulose is our most common specification for Kirby attics, and we typically source it from GreenFiber. The material is treated with borate fire retardant and packs tightly into the irregular joist bays of 1960s-era construction. Because Kirby homes almost always need a full tear-out first - the original fiberglass batt is compressed, dust-clogged, and mouse-tunneled to R-7 or below - we vacuum out the old material, air-seal top plates and can-light penetrations, then blow cellulose to R-38. A typical Kirby attic runs $2,200-$3,800 for this full retrofit.
Blown-In Fiberglass
We use Johns Manville loose-fill fiberglass when the job calls for lighter material weight or when the homeowner prefers synthetic fiber over cellulose. Fiberglass doesn’t absorb moisture the way organic material can, which matters in Kirby’s vented crawl spaces where humidity migrates upward. The trade-off is that fiberglass can settle more over time if the attic isn’t properly air-sealed first - which is why we seal before we blow, every time. Blown-in fiberglass attic jobs in Kirby typically range from $1,800-$3,400.
Dense-Pack Wall Insulation
Kirby’s 1950s-70s homes were built with empty stud cavities - no insulation at all in the walls. Dense-packing blows cellulose or fiberglass at high pressure into closed cavities through exterior holes or from the interior, filling the gap without removing drywall. On pier-and-beam homes like those along Ackerman Road or near Kirby Middle School, we often pair dense-packed walls with attic work and crawl space floor-cavity fill. The combined envelope upgrade is where we see the most dramatic blower-door improvement. Wall dense-pack in Kirby runs $1,200-$2,800 depending on home size and access.
Blown-In Top-Up
We offer top-ups, but in Kirby they’re rare. Because the original batt is so degraded, adding loose fill on top creates a layered system with the worst-performing material on the bottom - it doesn’t fix the compression, the rodent damage, or the air leaks. When we do top up, it’s typically on a home where we performed a full retrofit within the last 5-10 years and the homeowner wants to restore settled depth. A true top-up in Kirby runs $800-$1,500; most callers end up needing the full retrofit instead.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Before
AfterTrusted Brands We Install in Kirby
We don’t lock homeowners into proprietary products. For blown-in work in Kirby, we source from Owens Corning, Johns Manville, and GreenFiber - brands with established distribution in the San Antonio metro, which means no supply-chain delays and no markup on special orders. Our crews carry the full range of loose-fill densities and fire-retardant treatments, so the specification matches the house rather than whatever the warehouse had in stock. We document the product lot and installation depth in your photo record.
Common Blown-In Insulation Problems We See in Kirby Homes
- Collapsed original batt below R-7. The 1960s fiberglass in Kirby attics has been walked on, compressed by storage, and tunneled by rodents for decades. Its effective R-value is a fraction of the label. A simple top-up won’t restore performance - the old material has to come out first.
- Vented crawl spaces bleeding conditioned air. Nearly every Kirby home sits on pier-and-beam with an open, vented crawl. Blown-in attic insulation alone doesn’t stop cold air from dropping through the floor in winter or cooled air from escaping in summer. We dense-pack the floor cavity or encapsulate the crawl to complete the envelope.
- 150°F attic temperatures degrading loose fill. From May through October, Kirby attics bake. If the attic floor isn’t air-sealed before blowing, the loose fill migrates around can lights and chases, creating thin spots and settled piles. The air seal is the foundation; insulation is the cap.
- Post-Uri freeze damage to under-insulated plumbing. The February 2021 freeze exposed how poorly these older homes handle sustained cold. Pipes in vented crawls and unsealed attics froze across Kirby. Proper insulation and air sealing reduce that risk without relying on drip faucets and space heaters.
Pricing for Blown-In Insulation in Kirby, TX
Most full attic retrofits in Kirby run $1,800-$4,200. Blown-in cellulose to R-38 after full tear-out and air sealing: $2,200-$3,800. Blown-in fiberglass to equivalent depth: $1,800-$3,400. Dense-pack wall insulation: $1,200-$2,800. Crawl space floor-cavity dense-pack or encapsulation: $1,500-$3,500 additional.
What moves the number: attic square footage, whether the old material is accessible for vacuum removal, the condition of the deck (some 1960s Kirby homes have degraded OSB that needs repair before blowing), and whether we’re also treating walls or crawl space. Every estimate includes the written scope, the written warranty, and the Documented Photo Record - no line item is optional or hidden.
Bring us any competing written estimate and we’ll review it with you. Free second opinion, no obligation. Call (830) 549-6646.
We Also Serve Cities Near Kirby
Our crews cover the full San Antonio metro corridor. If you’re in Kirby or nearby Seguin, New Braunfels, Cibolo, or Schertz, dispatch and scheduling are coordinated from our San Antonio office with same-day or next-day availability for most estimates.
Serving Kirby, TX - Our Local Coverage Area
We’re based in the Kirby area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Blown-In Insulation in Kirby
No - in Kirby, we almost never recommend a top-up because the original 1950s-70s fiberglass batt is compressed and degraded to R-7 or below. Adding loose fill on top leaves the worst-performing layer against your ceiling, doesn’t fix air leaks, and can trap moisture against the old material. We vacuum out the old insulation, air-seal the attic floor, then blow new cellulose or fiberglass to full depth. Call (830) 549-6646 for a written scope and price - estimates are free.
Yes, but only if the attic is air-sealed first and the crawl space is addressed. Kirby attic temperatures exceed 150°F from May through October, and conditioned air leaks straight into that heat through unsealed top plates and can lights. We’ve measured blower-door reductions of 40-60% on Kirby homes after full attic air sealing, insulation, and crawl space treatment. The homeowner off Ackerman Road saw his summer electric bill drop the first full month after we completed the work. Call (830) 549-6646 for a free estimate with written pricing.
Dense-pack wall insulation blows cellulose or fiberglass at high pressure into the empty stud cavities of exterior walls, filling them completely without removing drywall. Kirby’s post-war tract homes were built with no wall insulation at all - the studs are hollow. Dense-packing cuts conductive heat loss through walls by 70-80% and is the single biggest comfort upgrade after attic work. Most Kirby homes we assess qualify for wall dense-pack. Written pricing before any work starts - call (830) 549-6646.
A full attic tear-out, air seal, and re-insulation on a typical 1,200-square-foot Kirby home takes one day. If we’re also dense-packing walls and treating the crawl space, plan on two days. We arrive on schedule, you get a named technician and a text when they’re on the way - Haven Standard: Arrive on schedule. The Documented Photo Record and blower-door numbers are delivered before we leave. Call (830) 549-6646 to schedule.
Blown-in cellulose and fiberglass are cost-effective retrofits for Kirby’s existing housing stock, where the attic floor is accessible and the goal is to fill joist bays and wall cavities at lower cost per R-value than spray foam. Spray foam is excellent for certain applications - we install Demilec open-cell foam when the job calls for it - but for most Kirby pier-and-beam homes, blown-in delivers the performance gain at 30-40% lower cost. The key is air sealing first, then insulating, regardless of material. Call (830) 549-6646 for a written recommendation based on your home.
Written by Wes Okafor, Owner at Envelope Insulation Co., serving Kirby and the San Antonio metro since 2016.