Fast, Reliable Blown-In Insulation Across Castle Hills
Blown-in insulation in Castle Hills typically costs between $1,800 and $4,200 for a full attic retrofit, with most jobs completed in a single day. We’re Envelope Insulation Co., and our crews serve Castle Hills from our Dallas-Fort Worth dispatch office with same-week scheduling for standard jobs and next-day response for urgent heat-load issues. If your mid-century ranch on Northwest Military Highway or a street off Jackson-Keller Road can’t stay cool, call (830) 402-5240. We’ll send a written price before any work starts, and you’ll get a documented photo record when we leave.
Why Topside Attic Insulation Schertz Is Castle Hills’s Preferred Blown-In Insulation Company
We’ve sealed and insulated more than 9,000 homes since 2016, and Castle Hills represents a distinct concentration of our work. The city’s homogeneous stock of 1950s and 1960s brick ranches means we’ve refined our mid-century retrofit scope to a documented system. Every Castle Hills job begins with a blower-door test - a pressurization reading that shows, in one number, how much air your building envelope is losing - and ends with a second test so you can verify the improvement.
Our Castle Hills customers find us through referrals from neighbors on streets like Cherry Ridge and Ridge Oak, where word travels fast in a community of roughly 4,000 residents. Reviews consistently mention two things: our crews show the before-and-after blower-door numbers without being asked, and we pull the correct permit from Castle Hills City Hall instead of creating a San Antonio compliance headache.
Response time to Castle Hills is typically same-week for estimates and within 48 hours for scheduled work. Dispatch is coordinated from our Dallas-Fort Worth office, but the crew that arrives at your door knows the local conditions: low-pitched roofs, original construction with minimal insulation, and the salt-air corrosion that attacks attic hardware faster than inland locations.
Our Blown-In Insulation Services in Castle Hills
Blown-In Cellulose
We use GreenFiber cellulose for most Castle Hills attics. Cellulose handles the 140-150°F summer attic temperatures common in IECC climate zone 2A better than settled fiberglass, and its density reduces air movement through the insulation layer. For a typical 1,400-square-foot Castle Hills ranch, we blow to an R-38 depth after air sealing, which usually means 10 to 12 inches over the top plates. The material is treated for fire resistance and pest deterrence, though in Castle Hills we most often recommend it for thermal performance and the way it fills irregular joist bays in these older homes.
Blown-In Fiberglass
When a Castle Hills homeowner prefers fiberglass or has specific material requirements, we source from Owens Corning and Johns Manville. Blown-in fiberglass works well for top-ups where the existing insulation is in good condition and the primary goal is adding R-value without the weight of cellulose. We do not blow fiberglass over unsealed air leaks - that’s Haven Standard Clause 1, and it applies whether the material is fiberglass or cellulose.
Dense-Pack Wall Insulation
Most Castle Hills ranches were built with empty wall cavities. Dense-pack cellulose fills those cavities at 3.5 pounds per cubic foot, dense enough to resist settling and slow air infiltration through the stud bays. This is a specialized application: we drill access holes at the top and bottom of each cavity, fill under pressure, and patch the holes to match the exterior brick. For homes on streets like Ridge Oak, where original construction had no wall insulation, dense-pack is often the single most noticeable comfort upgrade.
Blown-In Top-Up
Not every Castle Hills attic needs a full removal and replacement. If your existing fiberglass is clean and reasonably distributed, we can air-seal the penetrations and blow a new layer over the old to reach target R-value. A typical top-up in Castle Hills runs $1,200 to $2,400, compared to $2,800 to $4,200 for full removal and replacement. We assess whether the existing material is worth keeping - if it’s compressed, water-stained, or contaminated, we’ll tell you and document why with photos.
Our Blown-In Insulation team treats every Castle Hills job as a building-envelope project, not a commodity blow-in. The insulation is the last step, not the first.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Castle Hills
We source materials from Owens Corning, Johns Manville, Knauf, and GreenFiber, with no proprietary lock-in that limits your options. For Castle Hills, we stock GreenFiber cellulose and Owens Corning fiberglass at our regional warehouse, which means no supply-chain delay for standard jobs. If your project calls for a specific material - say, Owens Corning ProPink for a top-up where weight matters - we specify it in the written scope and deliver it on the scheduled day. No substitutions without your approval.
Common Blown-In Insulation Problems We See in Castle Hills Homes
- Settled fiberglass losing R-value. Original 1950s and 1960s attics in Castle Hills were typically insulated with 3 to 5 inches of fiberglass batts. After sixty years, that material has compressed to half its original thickness or less, leaving the top of your ceiling practically uninsulated. We measure what remains and calculate the gap to target R-value.
- Missing air sealing overwhelming new insulation. Hot attic air and Gulf humidity push through gaps around top plates, can lights, and plumbing penetrations. Blown-in insulation without air sealing is like pouring water into a bucket with holes. We seal first, then insulate. Always.
- Corroded fasteners and hardware from salt air. Castle Hills sits close enough to the Gulf for salt air to accelerate corrosion of roof-deck fasteners, gable-vent hardware, and attic penetration flashings. We inspect these during every attic evaluation and replace corroded components with corrosion-rated hardware while we’re in the space. Ignoring this creates gaps that undermine your insulation envelope.
- Homes that have never had a modern insulation upgrade. Long-tenure ownership in Castle Hills means many homes are cosmetically well-maintained but still running original construction insulation. The homeowner knows the house runs hot; they don’t always know why. Our blower-door test and attic inspection document the cause in measurable terms.
Pricing for Blown-In Insulation in Castle Hills, TX
Most full attic retrofits in Castle Hills run between $2,800 and $4,200, depending on attic square footage, existing material condition, and whether dense-pack wall insulation is included. Blown-in top-ups where we add over existing material typically fall between $1,200 and $2,400. Dense-pack wall insulation for a full single-story ranch adds $2,000 to $3,600.
What moves the number: attic accessibility (low-pitched Castle Hills roofs can be tight), whether we need to remove old material, the extent of air sealing required around can lights and top plates, and any corroded hardware replacement. Every Castle Hills job gets a flat, written price before work starts - Haven Standard Clause 1 - with no change orders unless you add scope.
We also provide a Free Second Opinion on any written estimate from another contractor. Bring us their scope; we’ll read it with you and tell you where the gaps are.
We Also Serve Cities Near Castle Hills
Our crews work throughout the San Antonio metro, including Castle Hills neighbors in Schertz, Cibolo, Universal City, and Selma. Same written-price standard, same documented photo record, same before-and-after blower-door numbers where applicable.
Serving Castle Hills, TX - Our Local Coverage Area
We’re based in the Castle Hills 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 Castle Hills
Yes. Castle Hills operates its own independent building department and issues its own permits, even though the city is completely surrounded by San Antonio. A contractor who pulls a San Antonio permit for your Castle Hills job has created a compliance problem that can delay your project. We call Castle Hills City Hall directly for every permit, a small operational detail that matters in a tight-knit community of 4,000 residents. Call (830) 402-5240 and we’ll confirm permit status on your specific property.
An R-38 to R-49 depth is the practical target for Castle Hills attics, which translates to 10 to 14 inches of blown cellulose or 12 to 16 inches of blown fiberglass after air sealing. The 140-150°F summer attic temperatures in IECC climate zone 2A mean your insulation is working under severe load; shallow or settled material simply cannot keep up. We specify the exact depth and R-value in your written scope, and we verify with a thermal camera after installation.
Sometimes. If the existing fiberglass is clean, dry, and reasonably distributed, a blown-in top-up is cost-effective and performs well. If it’s compressed, water-stained, contaminated by rodent activity, or blocking soffit vents, we remove it first. We document the condition with photos during our evaluation and show you before we recommend either approach. The decision is yours, but the recommendation is based on what we found, not what we prefer to install.
Because unsealed air leaks destroy the performance of even the best-installed insulation. Hot attic air and Gulf humidity push through gaps around top plates, can lights, plumbing penetrations, and electrical boxes. Blow insulation over those leaks and you’ve buried the problem, not fixed it. Our blower-door test measures the leakage before we start, we seal every accessible penetration, and we test again after. The number goes down, or we keep working. That’s Haven Standard.
Properly installed blown cellulose settles less than 5 percent in the first year and stabilizes; blown fiberglass can settle 10 to 15 percent if not installed at proper density. In Castle Hills, we see the bigger issue is original material that settled over decades, not new material settling prematurely. If your attic hasn’t been evaluated in 10 years, schedule an inspection. We’ll measure what you have, compare it to target R-value, and give you a written price for any top-up needed. Estimates are free.
Ready to see what your Castle Hills attic actually needs? Call (830) 402-5240 for a free evaluation with written price. We’ll bring the blower-door test, the thermal camera, and the documentation you’ll walk away with.
Written by Wes Okafor, Owner at Envelope Insulation Co., serving Castle Hills with written prices and documented results since 2016.