Fast, Reliable Blown-In Insulation Across Alamo Heights
Most blown-in insulation jobs in Alamo Heights run $1,800-$4,500 depending on attic size and whether we’re dense-packing walls or topping up existing material. We’re typically on-site within 24 hours of your call, and every job starts with a written price before anyone lifts a tool. Call (830) 549-6646 for a free estimate.
We serve Alamo Heights from our San Antonio dispatch office, and our crews know the city’s 1920s-1950s Period Revival stock cold - the Spanish Colonials along Castano Avenue, the Tudors near Alamo Heights High School, the Craftsman bungalows tucked behind Broadway. These homes weren’t built for modern insulation. They were built with solid masonry walls, original plaster-on-lathe interiors, and attics that hit 140°F through July and August. That combination demands a different approach than standard San Antonio tract-home retrofits, and we’ve been refining ours since 2016.
Why Topside Attic Insulation Seguin Is Alamo Heights’s Preferred Blown-In Insulation Company
We’ve sealed and insulated over 9,000 homes since 2016, and a significant share of those have been in Alamo Heights and surrounding inner-ring neighborhoods. Our reviews from Alamo Heights customers consistently cite the same thing: we show up when we say we will, we explain what we found rather than what we feel about it, and we leave documentation - written scope, blower-door numbers, photo record - that holds up when they sell the home or file insurance claims.
Response time to Alamo Heights is same-day or next-day for standard calls, and our 24/7 live-answer desk means you’re never waiting through a voicemail loop. Because we coordinate dispatch from our San Antonio office, crews are already in the corridor for Olmos Park, Terrell Hills, and Alamo Heights most days of the week.
The local knowledge that matters here: Alamo Heights runs its own permitting and inspections, independent of San Antonio. Crews who don’t know that pull the wrong permits, fail inspection, and leave homeowners with exposed holes in historic facades. We file with the City of Alamo Heights directly, and our scopes are written to pass their non-invasive requirements on the first try.
Our Blown-In Insulation Services in Alamo Heights
Blown-In Cellulose
We use GreenFiber cellulose for most Alamo Heights attic jobs - it’s treated with borate for fire and pest resistance, and it packs well into the irregular joist bays common in pre-1950 construction. In a typical 1,800-square-foot Alamo Heights attic with compressed original fiberglass, we’ll remove or work around the old material, air-seal top plates and penetrations, then blow cellulose to R-38 or R-49 depending on your roof geometry. Most jobs run $2,200-$3,800.
Blown-In Fiberglass
We stock Owens Corning fiberglass for homeowners who prefer it, or for attics where moisture history makes cellulose less suitable. Fiberglass doesn’t settle as aggressively as older products did, but it still requires air sealing first - we never blow over an unsealed attic floor. In Alamo Heights’s heat-dominant climate, an unsealed fiberglass job is just expensive air conditioning for your attic.
Dense-Pack Wall Insulation
This is where Alamo Heights gets complicated. Dense-pack blown-in insulation - cellulose or fiberglass packed at 3.5 pounds per cubic foot into wall cavities - is our standard approach for homes with actual stud bays. But a significant share of Alamo Heights homes from the 1930s-1940s were built on solid masonry or full-brick walls with no interior stud cavity whatsoever. Contractors trained on standard San Antonio tract homes drill into these walls expecting a cavity, find none, and either abandon the job mid-wall or improperly fill the masonry core, trapping moisture against original plaster-on-lathe.
We don’t guess. We infrared-scan first. If the walls are solid masonry, we pivot to insulating the attic plane and sealing the thermal envelope - the only effective approach that preserves historic facades and interior plaster. When stud cavities do exist, typically in later additions or specific neighborhoods like the Olmos Park Terrace-adjacent sections, we dense-pack with GreenFiber and patch with matched materials. Either way, the original plaster stays intact.
Blown-In Top-Up
The most common call we get in Alamo Heights: “Can you just add more insulation on top of what’s there?” Sometimes. But original 1920s-1950s attic fiberglass in these Period Revival homes has settled and compressed to R-values far below modern minimums, often with no vapor barrier. A simple top-up without air-sealing just re-compresses and underperforms. We assess what’s there, remove it if it’s compromised, seal the attic floor properly, then blow new material. A top-up that skips those steps is money thrown at your roof deck.
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 Service in Alamo Heights
We source materials from Owens Corning, Johns Manville, Knauf, Icynene, Demilec, and GreenFiber - no proprietary lock-in, so we specify what’s right for your home rather than what our supplier demands. For Alamo Heights’s older housing stock, that usually means GreenFiber cellulose for attics and knee walls, Owens Corning fiberglass when moisture conditions warrant it, and Icynene or Demilec spray foam for selective air-sealing in attic planes where dense-pack isn’t an option. We keep common densities and blower settings in stock, so most jobs don’t wait on material delivery.
Common Blown-In Insulation Problems We See in Alamo Heights Homes
- Solid masonry walls with no cavity. Contractors drill into 1930s brick expecting a stud bay, hit solid masonry, and either walk off the job or fill the core improperly. We scan first, pivot to attic-plane insulation when needed, and preserve every original plaster surface.
- Compressed, settled original fiberglass. That yellow-pink fluff in your Alamo Heights attic was probably installed in the 1970s or 1980s and has compressed to half its original R-value. Adding more on top without removing or addressing it creates uneven thermal layers and potential moisture traps.
- San Antonio permits pulled for Alamo Heights jobs. The city runs its own inspections, and crews unfamiliar with that requirement show up with the wrong paperwork. We file directly with Alamo Heights and write scopes to their non-invasive standards from the start.
- Attics hitting 140°F+ with no air sealing. In San Antonio’s heat-dominant climate, an unsealed attic in an Alamo Heights home is a radiator pushing downward all summer. Insulation without sealing is incomplete work, and we don’t do incomplete work.
Pricing for Blown-In Insulation in Alamo Heights, TX
| Service | Typical Range in Alamo Heights |
|---|---|
| Attic blown-in cellulose (1,200-2,000 sq ft, remove old + air seal + blow new) | $2,200-$3,800 |
| Attic blown-in fiberglass (same scope) | $2,400-$4,000 |
| Dense-pack wall insulation (where cavities exist, per 1,000 sq ft of wall) | $1,800-$3,200 |
| Blown-in top-up over existing (assumes viable base material + air sealing) | $1,200-$2,200 |
| Attic air sealing only (blower-door verified, no new insulation) | $800-$1,600 |
What moves you within these ranges: attic accessibility (steep pitches and tight scuttles add labor), whether old material needs removal, the extent of air sealing required, and whether we’re working around original plaster or modern drywall. Every job gets a written price before work starts - Haven Standard Clause 1 - and we offer a Free Second Opinion on any competing written estimate. Call (830) 549-6646 for your exact number.
We Also Serve Cities Near Alamo Heights
Our crews work throughout the corridor: Alamo Heights, Seguin, New Braunfels, Cibolo, and Schertz. Dispatch is coordinated from our San Antonio office, so we’re rarely far from any of these markets. If you’re in Terrell Hills, Olmos Park, or the near-northside and need Blown-In Insulation expertise for older construction, we cover those areas as well.
Serving Alamo Heights, TX - Our Local Coverage Area
We’re based in the Alamo Heights 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 Alamo Heights
Only if there’s actually a cavity to fill. Many 1930s Alamo Heights homes - especially the Spanish Colonials and Tudors near Broadway and Castano - were built with solid masonry or full-brick walls and no stud bay behind the plaster. We infrared-scan first. If there’s no cavity, we insulate the attic plane and seal the envelope instead, preserving every original surface. Call (830) 549-6646 and we’ll assess what you’re working with - estimates are free.
Brick is a thermal mass, not an insulator. It absorbs and radiates heat. In San Antonio’s climate, your attic temperature is driven by roof exposure and attic ventilation, not wall material. Most Alamo Heights attics we test hit 140°F in July. Without adequate insulation and air sealing at the attic floor, that heat radiates downward through your ceiling. The brick walls don’t stop it - and in many of these homes, the attic has compressed 1970s fiberglass or nothing at all. We address the attic first; it’s the highest-ROI cooling upgrade for this housing stock.
Yes, Alamo Heights requires permits for insulation retrofits, and yes, it changes how we scope the work. The city runs its own inspections independently of San Antonio, and their standards emphasize non-invasive methods that preserve historic facades and interior plaster. We file directly with Alamo Heights, write scopes to their requirements from the start, and schedule inspections so you don’t get caught with exposed holes or failed paperwork. Crews who treat Alamo Heights like standard San Antonio often fail inspection and leave homeowners mid-job.
Sometimes, but rarely without prep. Original fiberglass in these 1920s-1950s homes has compressed to fractions of its original R-value, often with no vapor barrier and gaps at eaves and penetrations. Blowing new material on top without air-sealing first creates uneven density, potential moisture trapping, and underperformance. We assess what’s there. If it’s clean and reasonably distributed, we’ll air-seal and top up. If it’s compromised, we remove it, seal, and blow new. The written scope tells you which approach before anyone starts.
The February 2021 storm exposed severe thermal inadequacy in Alamo Heights’s older masonry homes - high ceilings, solid walls, and minimal attic insulation meant rapid heat loss and frozen pipes for many residents. The post-storm wave of upgrades in this neighborhood was notable, and for good reason: these homes lose conditioned air faster than modern construction, and the envelope is the fix. If your home went cold fast in 2021 or your heating bills spiked afterward, an insulation and air-sealing assessment is warranted. We provide before-and-after blower-door numbers so you can verify the improvement. Call (830) 549-6646 for a free estimate.
Ready to see what your home is actually losing? Call (830) 549-6646 for a free estimate. We’ll provide a written price before any work starts, a Documented Photo Record when we’re done, and on applicable jobs, before-and-after blower-door readings that show the performance change in a single number. The 365-Day Done Right Promise applies to all work, and a live person answers our phones 24/7.
Written by Wes Okafor, Owner at Topside Attic Insulation Seguin, serving Alamo Heights since 2016.