Fast, Reliable Spray Foam Insulation Across Cibolo
Spray foam insulation in Cibolo typically runs $1.80-$3.20 per board foot for open-cell and $3.50-$5.50 for closed-cell, with most whole-attic jobs falling between $3,800 and $7,200 depending on square footage and whether air sealing is needed first. We’re Envelope Insulation Co., and our Spray Foam Insulation crews serve Cibolo from our San Antonio dispatch office, usually arriving within 45 minutes to an hour for scheduled appointments. Call (830) 549-6646 - a live person answers 24/7, and we’ll have a written price in your hands before any work starts.
Cibolo’s a unique market for us. The city exploded from roughly 3,000 residents in 2000 to well over 30,000 by the early 2020s, and nearly the entire housing stock consists of 2000s-2020s production-builder tract homes. These homes look new. They feel new. But builder-grade blown fiberglass attics paired with ductwork in unconditioned attic spaces are quietly driving some of the highest cooling bills in the San Antonio metro. We’ve sealed and insulated over 9,000 homes since 2016, and Cibolo keeps surprising homeowners who assumed “newer” meant “efficient.”
Why Topside Attic Insulation Seguin Is Cibolo’s Preferred Spray Foam Insulation Company
We’ve built our reputation in Cibolo on documented results, not promises. Every applicable job gets 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 our crew leaves. Homeowners in Saddle Creek and along the FM 1103 corridor have those readings in their files, and they refer neighbors because they can point to a number, not a feeling.
Our response time to Cibolo averages under an hour for scheduled work, and we carry materials from Owens Corning, Johns Manville, and Knauf so we’re not waiting on orders. The 365-Day Done Right Promise applies to every job - if it’s not done right, we make it right - and that promise is backed by a written scope and written warranty delivered before anyone lifts a tool. Haven Standard: Have it in writing.
We answer calls live, 24/7. No voicemail loops. No callback windows measured in business days. When you’re staring at a July CPS Energy bill that jumped $180 from last year, you don’t want to leave a message.
Our Spray Foam Insulation Services in Cibolo
Open-Cell Spray Foam
Open-cell spray foam runs $1.80-$2.80 per board foot in the Cibolo market and performs best in attic floors and roof decks where you need both insulation and air sealing in one application. In Cibolo’s vented attics - the standard for production homes here - open-cell creates a semi-permeable barrier that stops air migration while allowing some moisture vapor to pass, which matters when your attic hits 145°F in August and any trapped moisture becomes a problem. We specify open-cell for most Cibolo attic retrofits because it fills irregular framing cavities completely, something blown fiberglass never manages around truss heels and top plates.
Closed-Cell Spray Foam
Closed-cell spray foam costs $3.50-$5.50 per board foot in Cibolo and delivers R-6.5 per inch with a hard, moisture-resistant surface. We use it where space is tight and R-value per inch matters: rim joists in crawl-less slab homes, garage ceiling applications where headroom is limited, and exterior walls during deep-energy retrofits. Closed-cell also adds structural rigidity, which we’ve found useful in Cibolo’s two-story production homes where garage bonus rooms flex seasonally. The material is denser and more expensive, so we specify it only where the application justifies the cost.
Rim Joist Spray Foam
Rim joist spray foam in Cibolo runs $800-$1,400 for a typical slab-on-grade home, and it’s the most overlooked upgrade in the city’s housing stock. Production builders here left rim joists unsealed or stuffed with fiberglass batts that sag and create convection loops. During Winter Storm Uri, those gaps became the direct path for freezing air to reach plumbing chases. We spray closed-cell foam across the full rim joist perimeter, sealing the joint between foundation and framing. In a home near Steele High School built in 2006, we measured a 12°F temperature difference at the floor perimeter before treatment and 2°F after. The homeowner’s February 2021 pipe-freeze anxiety hasn’t returned.
Garage Ceiling Spray Foam
Garage ceiling spray foam in Cibolo typically costs $1,200-$2,400 and solves a problem specific to this market: bonus rooms and bedrooms above unconditioned garages that never hold temperature. Volume builders here ran HVAC ducts through garage ceiling cavities with R-6 flex duct and no air sealing, then blew R-30 fiberglass over the top. The result is a 20-30% cooling loss before conditioned air ever reaches the room above. We remove or work around the existing ductwork, air-seal all penetrations, and spray open-cell foam across the garage ceiling to create a thermal boundary where none existed. That bonus room finally holds setpoint. The AC stops running continuously. The CPS Energy bill drops.
Spray Foam Roof Deck
Spray foam applied directly to the roof deck - $4,500-$8,500 for most Cibolo homes - converts a vented attic into a conditioned, semi-conditioned, or unvented assembly. This is the aggressive fix for homes where ductwork in the attic is beyond relocation and the homeowner wants to stop fighting 140°F air surrounding their HVAC equipment. We air-seal first, always, then spray open-cell foam to the underside of the roof deck at 5-7 inches for full R-value. The attic becomes part of the conditioned envelope. Equipment lasts longer. Duct losses near zero.
What happens when you call
- 1
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 Cibolo
We source spray foam materials from Owens Corning, Johns Manville, and Knauf - no proprietary lock-in, no single-source dependency. For Cibolo homeowners, that means we match the material to the application rather than forcing a product we happen to stock. Our San Antonio warehouse carries open-cell and closed-cell kits from multiple suppliers, so most Cibolo jobs start within a week of written approval. If a specific job calls for GreenFiber or another listed brand, we order without markup delay. You get the material that fits your assembly, not our inventory.
Common Spray Foam Insulation Problems We See in Cibolo Homes
- Attic spray foam applied over unsealed top plates. We see this in Cibolo homes where a previous contractor blew or sprayed insulation without first sealing the gap between wall top plates and drywall. Conditioned air still escapes into the attic; the insulation just hides the leak. Our protocol: blower-door test first, air seal all top plates and penetrations, then insulate.
- Garage ceilings and rim joists left completely unaddressed. Production builders in Saddle Creek and along FM 78 delivered homes with no thermal boundary at the garage ceiling and fiberglass-stuffed rim joists. The bonus room above the garage bakes. The floor perimeter runs cold. These are fixable problems, but only if someone inspects them.
- Closed-cell foam sprayed too thin at rim joists and plumbing chases. Winter Storm Uri exposed how many Cibolo homes had 1-2 inches of foam where 3+ inches were needed for thermal break. Thin foam cracks. Cold transfers. Pipes freeze. We specify full thickness and verify with documentation.
- Homeowners assuming “newer home” means “properly insulated.” This is the Cibolo-specific failure mode. Homes built in 2004 near Steele High School predate the 2009 IECC adoption. They look new. They were built to older, lower standards. The CPS Energy bill in July is often the first reality check.
Pricing for Spray Foam Insulation in Cibolo, TX
Here’s what spray foam insulation costs in the Cibolo market, based on jobs we’ve completed in Saddle Creek, near Cibolo Canyons, and along the FM 1103 and FM 78 corridors:
| Application | Typical Range | Notes |
|---|---|---|
| Open-cell attic (1,800 sq ft home) | $3,800 - $5,400 | Includes air sealing; price per board foot $1.80-$2.80 |
| Closed-cell attic or garage ceiling | $5,200 - $7,200 | Higher R-value per inch; price per board foot $3.50-$5.50 |
| Rim joist (typical slab home) | $800 - $1,400 | Closed-cell; full perimeter treatment |
| Garage ceiling only | $1,200 - $2,400 | Open-cell standard; closed-cell if space limited |
| Roof deck (unvented attic conversion) | $4,500 - $8,500 | Includes air sealing and ventilation strategy review |
What moves the number: attic square footage, existing insulation removal needs, accessibility for hose runs, and whether we find unsealed top plates or can lights that need pre-treatment. Every job starts with a written price - Haven Standard Clause 1 - and we provide a Free Second Opinion on any written estimate you’ve already received. Call (830) 549-6646 for an exact quote; estimates are free.
We Also Serve Cities Near Cibolo
Our crews work throughout the San Antonio metro, including Spray Foam Insulation in Cibolo and neighboring Schertz, Universal City, Converse, and New Braunfels. Dispatch and scheduling are coordinated from our San Antonio office. Same written-price protocol, same documented photo record, same 365-Day Done Right Promise applies everywhere we travel.
Serving Cibolo, TX - Our Local Coverage Area
We’re based in the Cibolo 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 - Spray Foam Insulation in Cibolo
Yes, almost certainly. Homes built in that era and area predate the 2009 and 2012 IECC adoption cycles, so attic insulation was typically blown to R-30 or less - the old standard - and wall cavities were filled with minimal fiberglass batts. The home looks new. The insulation performs like it’s twenty years behind. Call (830) 549-6646 and we’ll inspect with a written price before any work starts.
Open-cell costs less ($1.80-$2.80 per board foot), expands more, and works best in attic floors and roof decks where you need air sealing plus insulation with some moisture permeability. Closed-cell costs more ($3.50-$5.50 per board foot), delivers higher R-value per inch, and resists moisture - we use it for rim joists, garage ceilings, and anywhere space is tight. For most Cibolo vented-attic retrofits, we specify open-cell. For unvented roof decks or conditioned crawl spaces, closed-cell often wins. We’ll recommend based on your assembly, not our preference.
Yes, specifically at rim joists and plumbing chases. The pipe freezes we saw across Cibolo in February 2021 traced directly to unsealed rim joists and thin-wall construction that let outside air reach interior plumbing. Closed-cell spray foam at the rim joist creates a thermal and air barrier that fiberglass batts never achieved. We document before-and-after readings so you can verify the fix. Call (830) 549-6646 for a rim joist assessment.
Most Cibolo production-home warranties cover structural defects and major systems for 1-10 years, but they do not cover energy performance or insulation adequacy. Spray foam installed after closing is homeowner-improved property and does not void structural warranties. We coordinate with your warranty documentation if needed, and our photo record becomes part of your home’s maintenance file. One Saddle Creek homeowner had us complete work, then referenced our documentation during a builder warranty tune-up - the same original duct-loss issue was still visible in their neighbor’s unit.
Because “newer” in Cibolo means built to minimum code with blown fiberglass in vented attics and HVAC ducts routed through 140°F+ attic cavities. The production builders delivered code-minimum assemblies that perform poorly under South Texas Plains summer loads. Your home is losing 20-30% of conditioned air before it reaches your rooms. Spray foam, properly specified after air sealing, fixes the building envelope rather than forcing your HVAC to compensate. We publish blower-door numbers so you can see exactly what changed.
Written by Wes Okafor, Owner at Envelope Insulation Co., serving Cibolo and the San Antonio metro since 2016.