Fast, Reliable Spray Foam Insulation Across Terrell Hills
Spray foam insulation in Terrell Hills typically costs $3.50-$7.00 per board foot depending on open-cell versus closed-cell application, and most whole-attic retrofits on the area’s large mid-century homes run $8,000-$18,000. We’re usually on-site in Terrell Hills within 24-48 hours of your call, with crews dispatched from our San Antonio office. Call (830) 549-6646 for a written price before any work starts.
We’ve worked on enough Terrell Hills homes to know the pattern: a 1950s brick custom build off Arcadia Place or a 1960s hip-roof estate near Morningside Drive, original fiberglass batts compressed to nothing in an attic that hits 140°F in August. The homeowner calls after the February 2021 freeze or after another $400 summer electric bill. Our Spray Foam Insulation team starts every job with a blower-door test, air-seals every penetration, then matches the foam type to the surface. No blow-overs. No shortcuts.
Why Topside Attic Insulation Seguin Is Terrell Hills’s Preferred Spray Foam Insulation Company
We’ve sealed and insulated over 9,000 homes since 2016, and a growing share of them sit inside Terrell Hills’s boundaries. The reviews we get from homeowners here mention the same things: the written price that showed up before anyone lifted a tool, the photo record they received at job’s end, and the blower-door number that proved the house actually changed. One homeowner on Crestway Drive told us she called three contractors; we were the only one who mentioned the compressed batts against her roof deck before she did.
Response time to Terrell Hills runs same-day or next-day for most calls, with scheduling coordinated from our San Antonio office. Crews know the local conditions: the restricted soffit ventilation on post-war hip roofs, the uninsulated brick-veneer wall cavities, the way San Antonio’s 100°F summers and hard freezes punish these older envelopes. That local knowledge changes what we find and how we fix it.
Every job carries the 365-Day Done Right Promise. Under Haven Standard Clause 1, you get a flat price, written scope, and written warranty before anyone starts. A live person answers our phones 24/7. No voicemail loops.
Our Spray Foam Insulation Services in Terrell Hills
Open-Cell Spray Foam
Open-cell spray foam in Terrell Hills goes on attic floors and some wall cavities where we need breathability and cost control. It’s half-pound density, expands to fill irregular joist bays in these old custom builds, and gives roughly R-3.6 per inch. In Terrell Hills, we use open-cell Icynene on attic floors after we’ve pulled the blackened, compressed original batts and sealed the top plates. The foam creates an air barrier at the attic floor line, which is the right move when the roof deck above has its own moisture management story.
Closed-Cell Spray Foam
Closed-cell spray foam is two-pound density, R-6.5 per inch, and vapor-closed. In Terrell Hills, we use it where moisture risk and structural rigidity matter: roof decks of restricted-soffit hip roofs, rim joists in uninsulated crawl spaces, and garage ceilings beneath conditioned rooms. We source Demilec and other closed-cell products for these applications. On a recent job near Wildwood Drive, closed-cell on the roof deck and rim joists dropped the blower-door reading from 3,800 CFM50 to 1,900 after air sealing. The homeowner got the before-and-after numbers in writing.
Spray Foam Roof Deck
Roof deck spray foam in Terrell Hills addresses a specific failure mode: the post-war hip roof with tight rafter tails and minimal soffit intake, where original batts compressed flat against the deck and trapped moisture for decades. We remove the failed material, dry the deck, then apply closed-cell foam directly to the roof deck to create an unvented conditioned attic. This assembly works in Terrell Hills because it doesn’t depend on soffit ventilation that isn’t there. The attic stays within a few degrees of the living space. HVAC equipment up there stops fighting 140°F air.
Rim Joist Spray Foam
Rim joists in Terrell Hills homes are almost always unsealed. The band joist where the first floor meets the foundation is a straight shot for air infiltration, and in these brick-veneer structures, the cavity was typically left open at construction. We spray closed-cell foam across the rim joist after blower-door-directed air sealing. On homes with crawl spaces, this is where the biggest single leak often hides.
Garage Ceiling Spray Foam
Garage ceiling spray foam matters in Terrell Hills because many of these large homes have bonus rooms or conditioned spaces above the garage. The garage ceiling is a thermal and air boundary that was rarely treated properly in the 1950s or 1960s. We apply closed-cell foam to seal and insulate, stopping the stack effect that pulls garage air into the living space.
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.
Before
AfterTrusted Brands We Service in Terrell Hills
We don’t lock you into proprietary products. Our crews stock and install materials from Icynene, Demilec, Owens Corning, and other major manufacturers, sourced through standard distribution channels with no exclusive arrangements. For Terrell Hills jobs, this means we can match the foam chemistry to the assembly rather than forcing a single product into every cavity. If your architect or energy consultant specifies a particular brand for compatibility with other building envelope components, we can typically accommodate without extended lead times. The materials arrive, the crew applies them to a written scope, and you receive a Documented Photo Record showing coverage depth and completeness.
Common Spray Foam Insulation Problems We See in Terrell Hills Homes
- Spray foam applied directly over compressed original batts. We see this on hip-roof homes throughout Terrell Hills, where a previous contractor blew new material over blackened, moisture-damaged fiberglass that was flat against the deck. The new foam traps the existing moisture condition against the wood. Full removal first. Always.
- Closed-cell sprayed too thick on roof decks without moisture accounting. Terrell Hills’s restricted-soffit hip roofs can’t dry through the soffit line. Closed-cell on the roof deck works, but only as part of a designed unvented assembly with proper ratio of foam to remaining permeability. Get it wrong and the deck rots from the inside.
- Attic sealed but rim joists and walls ignored. These brick-veneer homes often have empty wall cavities and wide-open band joists. The attic gets tight but the house still leaks at the perimeter. We address the whole envelope, not just the easy space.
- One foam type used everywhere. Open-cell on a Terrell Hills roof deck in a restricted-ventilation assembly is a moisture risk. Closed-cell on every attic floor is unnecessary cost. We match the product to the surface.
Pricing for Spray Foam Insulation in Terrell Hills, TX
Most spray foam insulation jobs in Terrell Hills fall into these ranges based on what we’ve quoted over the past three years:
| Application | Price Range |
|---|---|
| Open-cell attic floor (typical 2,500 sq ft home) | $8,000 - $12,000 |
| Closed-cell roof deck (hip roof, full assembly) | $10,000 - $16,000 |
| Rim joist sealing (crawl space or basement) | $1,800 - $3,500 |
| Garage ceiling (bonus room above) | $2,500 - $4,500 |
| Whole-home retrofit (attic + rim + selective walls) | $14,000 - $22,000 |
What moves the number: the condition of existing insulation (full removal adds labor), accessibility of the attic (these old Terrell Hills homes sometimes have scuttle holes instead of proper access), and whether we’re treating the roof deck or just the floor. Every quote includes the written scope, the warranty terms, and the blower-door target. No work starts without the written price. Call (830) 549-6646 for your specific estimate.
We Also Serve Cities Near Terrell Hills
Our crews work across the metro area, including Terrell Hills, Seguin, New Braunfels, Cibolo, and Schertz. Scheduling and dispatch run from our San Antonio office, with local crews serving each area. Same standards, same documentation, same written price before work starts.
Serving Terrell Hills, TX - Our Local Coverage Area
We’re based in the Terrell 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 - Spray Foam Insulation in Terrell Hills
Because the original fiberglass batts in your Terrell Hills home have likely compressed flat against the roof deck with no airspace, trapping moisture and blackening or rotting the material. On a 1950s custom brick home off Arcadia Place with a low-slope hip roof, our crew pulled original fiberglass batts that had compressed flat against the deck with no airspace and showed black moisture staining along the rafter tails. After full removal and drying, we installed open-cell Icynene across the attic floor and closed-cell Demilec on the roof deck to seal the restricted-soffit assembly, then matched the rim joists with closed-cell foam. The homeowners went from an attic that hit 140°F on August afternoons to one that stayed within a few degrees of the living space, and they finally stopped losing heat during the next hard freeze. Spray foam applied over that wet, compressed layer seals the moisture against the deck and accelerates rot. Call (830) 549-6646 and we’ll show you what we’re finding in your specific attic.
Use open-cell on the attic floor and closed-cell on the roof deck, rim joists, and garage ceiling. Open-cell Icynene at the attic floor line gives you the air barrier and thermal performance at lower cost, while the vapor-open character lets the assembly breathe. Closed-cell on the roof deck handles the moisture risk in Terrell Hills’s restricted-soffit hip roofs and adds structural rigidity. We match the product to the surface after we see your specific assembly. Call (830) 549-6646 for a written scope.
Yes, and they were almost always left empty at construction. The brick-veneer structures common in Terrell Hills have uninsulated wall cavities that leak air and transmit heat. During full attic retrofits, we increasingly get requests for drill-and-fill injection foam into those walls. It’s not always part of the initial scope, but once the attic is sealed, the wall cavities become the next obvious leak path. We can assess and quote wall work as a phase two or include it in the original written price.
Yes. Spray foam’s air-sealing performance addresses both conditions, which is why demand surged in Terrell Hills after February 2021. The same blower-door reduction that keeps 140°F attic air out in August keeps heated air in when the grid fails. We’ve had Terrell Hills homeowners report their homes stayed livable for days during subsequent winter storms after we completed envelope work, even when neighbors with unsealed attics lost heat rapidly. The foam doesn’t just add R-value; it stops the air movement that carries temperature extremes.
Terrell Hills homes are large, custom, mid-century brick structures with specific failure modes: restricted soffit ventilation, compressed original batts flat against roof decks, uninsulated wall cavities, and rim joists that were never addressed. A standard weatherization crew might blow over the existing material and call it done. We pull the failed insulation, dry the deck, design the unvented roof assembly, seal the whole envelope including walls and rim joists, and give you blower-door numbers that prove the result. That’s the difference between a commodity job and a building-envelope retrofit. Call (830) 549-6646 for a written price.
Written by Wes Okafor, Owner at Envelope Insulation Co., serving Terrell Hills since 2016.