Insulation in Kirby, TX
Crawl space encapsulation and vapor barrier installation in Kirby, TX typically runs $2,800-$6,500 for a full encapsulation, with most ranch-style homes in this 1950s-1970s enclave falling in the $3,500-$4,800 range due to compact crawl footprints. We’re Envelope Insulation Co., and Kirby jobs are different because this entire city is a concentrated retrofit market - almost no home here was built to modern insulation standards, and the humid subtropical climate turns unsealed crawl spaces into moisture reservoirs that degrade floor joists and indoor air quality. Call (830) 420-0953 for a written price before any work starts.
Why Kirby Homes Are Different
Kirby is a landlocked working-class enclave completely surrounded by San Antonio, with a housing stock overwhelmingly built in the 1950s-1970s to house workers and military families near Randolph Air Force Base. These aging ranch-style homes were constructed under insulation standards a fraction of today’s code, meaning virtually the entire city’s residential base is a candidate for full attic and wall-cavity upgrades - a concentrated retrofit market unlike the sprawling, mixed-vintage suburbs nearby.
The vast majority of Kirby’s homes are post-WWII through early-1970s single-story ranch construction, many of which still have original or once-upgraded fiberglass batts that have settled, moisture-damaged, or simply never met modern R-38+ attic standards. The small geographic footprint and limited new development mean almost no modern, code-compliant insulation exists in the city’s housing base. Summer attic temperatures routinely exceed 150°F here, and the February 2021 Winter Storm Uri freeze exposed catastrophic thermal envelope failures that still drive calls today.
Many of Kirby’s 1960s-70s slab-on-grade ranches have little to no insulation in the exterior wall cavities - a common shortcut in that era’s military-adjacent speculative housing. When we probe walls before quoting, we frequently find only drywall against exterior brick veneer with an empty cavity, a situation that spray foam or blown-in dense pack must solve from the inside.
Our Main Kirby Services
Kirby homeowners call us most often about attic work and spray foam, though blown-in remains popular for cost-effective retrofits.
Attic Insulation in Kirby
Most Kirby attics we enter still carry original fiberglass batts rated at R-11 or R-19, far below the R-38 minimum now recommended for Bexar County’s climate zone. We remove the degraded material, seal all top plates and penetrations, then install Owens Corning or Johns Manville products to measured depth. Every attic job includes a Documented Photo Record and, when applicable, before-and-after blower-door numbers. Attic Insulation in Kirby covers our full process and pricing.
Spray Foam Insulation in Kirby
Spray foam is often the only viable solution for Kirby’s empty wall cavities and undersized attic spaces where batts won’t achieve full coverage. We use open-cell and closed-cell formulations from Demilec and Icynene, selected by application - closed-cell for exterior walls needing vapor control, open-cell for attic roofs where breathability matters. The Haven Standard applies: written price, written scope, documented result. Spray Foam Insulation in Kirby details our approach.
Blown-In Insulation in Kirby
Blown-in cellulose or fiberglass dense-pack remains the most cost-effective way to bring a Kirby attic to code without full gut renovation. We blow GreenFiber cellulose or Knauf fiberglass to consistent depth, installing proper baffles at eaves to maintain ventilation. For wall cavities, dense-pack blown-in fills the voids we find behind Kirby’s brick veneer with minimal interior disruption. Blown-In Insulation in Kirby explains material choices and expected performance.
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
AfterCrawl Space Encapsulation & Vapor Barrier in Kirby
Kirby’s 1950s-1970s ranch homes sit on crawl spaces that were rarely built with adequate moisture control, and Bexar County’s humid subtropical climate delivers groundwater vapor and seasonal flooding that standard foundation vents cannot exhaust. Without encapsulation, these crawl spaces harbor mold, rot floor joists, and draw musty air into living spaces through stack effect - the natural upward pull of air through a building’s envelope. Crawl Space Encapsulation & Vapor Barrier is the foundation of our envelope work in Kirby.
Crawl Space Vapor Barrier
Signs you need it
Your crawl space dirt floor is exposed, you smell mustiness indoors during humid months, or floor insulation above the crawl is sagging and blackened.
What it costs in Kirby
A 6-mil to 20-mil vapor barrier installed over the dirt floor in a typical Kirby ranch runs $1,200-$2,800.
How we do it
We clear debris, grade the floor, seam-seal a reinforced polyethylene sheet to foundation walls, and seal all penetrations with tape and mastic.
Crawl Space Encapsulation
Signs you need it
You’re seeing efflorescence on block walls, experiencing hardwood floor cupping, or running a dehumidifier continuously in the living space.
What it costs in Kirby
Full encapsulation with wall liners, sealed vents, and conditioned air supply for a Kirby ranch typically ranges $3,500-$6,500.
How we do it
We install a multi-ply reinforced liner on walls and floor, seal foundation vents, insulate the rim joist, and add a dehumidistat-controlled dehumidifier if needed.
What Crawl Space Encapsulation & Vapor Barrier Costs in Kirby
| Item | Typical range in Kirby |
|---|---|
| Vapor barrier (dirt floor only) | $1,200 - $2,800 |
| Full encapsulation (walls, floor, vents sealed) | $3,500 - $6,500 |
| Rim joist insulation add-on | $800 - $1,800 |
How long does crawl space encapsulation take in Kirby?
Most Kirby ranch crawl spaces are completed in two to three days. We deliver a written scope before starting and a Documented Photo Record when we leave.
Will encapsulation stop my floors from feeling cold?
Yes, once the rim joist is insulated and air infiltration is blocked, floor temperatures rise measurably. We verify with blower-door readings when the job permits.
Radiant Barrier Installation in Kirby
Kirby’s summer attic temperatures regularly exceed 150°F, and the unshaded ranch roofs built in the 1960s and 1970s act as solar collectors that dump heat directly onto undersized ductwork and inadequate insulation. A radiant barrier - a reflective foil or coating that blocks radiant heat transfer - reduces attic surface temperatures by 20-30°F, cutting HVAC runtime in homes where the air conditioner was never sized for modern comfort expectations. Radiant Barrier Installation is one of the highest-ROI upgrades we offer in this market.
Attic Radiant Barrier
Signs you need it
Your AC runs continuously after 2 p.m., ductwork in the attic feels hot to the touch, or your summer electric bills exceed $300 for a 1,200-square-foot home.
What it costs in Kirby
Radiant barrier foil stapled to rafters or laid over attic insulation in a typical Kirby ranch runs $1,500-$3,200.
How we do it
We install perforated foil across rafter bays or drape it over existing insulation, ensuring ventilation paths remain open and dust accumulation won’t degrade performance.
Radiant Barrier Roof Deck
Signs you need it
You’re re-roofing a Kirby home with original shingles, or your attic has no existing barrier and the roof deck is fully exposed during repair.
What it costs in Kirby
Spray-applied radiant barrier coating to the roof deck during accessible work ranges $2,000-$4,500 in Kirby.
How we do it
We apply a low-emissivity coating directly to the roof deck underside, creating a bonded radiant barrier that won’t tear or sag like foil sheets.
What Radiant Barrier Installation Costs in Kirby
| Item | Typical range in Kirby |
|---|---|
| Foil radiant barrier (attic install) | $1,500 - $3,200 |
| Spray-applied roof deck coating | $2,000 - $4,500 |
| Radiant barrier with attic air sealing package | $2,800 - $5,200 |
Does radiant barrier work with existing insulation?
Yes, it’s designed to complement, not replace, insulation. We lay foil over batts or blown-in without disturbing the thermal layer.
How much will my electric bill drop?
Most Kirby homeowners see 5-15% summer cooling reduction, with the biggest savings in homes where the attic was previously unsealed. We document pre- and post-conditions so you can verify.
Insulation Removal & Replacement in Kirby
Kirby’s housing stock is old enough that we regularly remove insulation contaminated by rodent activity, water damage from roof leaks, or decades of dust accumulation in original fiberglass batts. The 1950s-1970s construction timeline also means some homes contain vermiculite insulation that may harbor asbestos - a material we handle with licensed abatement partners, never in-house. Insulation Removal & Replacement in Kirby always begins with a written scope and hazard assessment.
Contaminated Insulation Removal
Signs you need it
You smell ammonia or mustiness from the attic, see droppings on insulation surfaces, or have had confirmed rodent or raccoon activity above the ceiling.
What it costs in Kirby
Contaminated insulation removal with HEPA containment in a typical Kirby ranch attic runs $1,800-$3,500.
How we do it
We establish negative air pressure, remove soiled material in sealed bags, HEPA-vacuum all surfaces, and apply antimicrobial treatment before any new insulation goes in.
Vermiculite & Old Insulation Removal
Signs you need it
Your attic contains gray-brown pebbly granules that may be vermiculite, or you’re planning renovation and need to verify what’s above the ceiling.
What it costs in Kirby
Vermiculite assessment and licensed removal coordination for a Kirby attic ranges $3,500-$7,500 depending on volume and lab results.
How we do it
We collect samples for lab analysis, coordinate EPA-compliant abatement if positive, and manage the full replacement with modern materials once clearance is issued.
What Insulation Removal & Replacement Costs in Kirby
| Item | Typical range in Kirby |
|---|---|
| Standard insulation removal (no hazards) | $1,200 - $2,500 |
| Contaminated insulation removal | $1,800 - $3,500 |
| Vermiculite removal with abatement | $3,500 - $7,500 |
Can you remove insulation with asbestos?
We do not handle asbestos directly; we test, coordinate licensed abatement, and return to install new insulation after clearance documentation.
Do I have to leave during removal?
For standard removal, no. For vermiculite or heavy contamination, we may recommend temporary relocation during abatement. We specify this in the written scope.
Attic Air Sealing in Kirby
Kirby’s 1960s and 1970s ranch homes were built with minimal attention to the building envelope - top plates were left unsealed, can lights cut into ceilings without airtight housings, and duct boots connected to drywall with gaps we can slide a pencil through. Attic air sealing closes these pathways so conditioned air stays in living spaces and attic heat, moisture, and pollutants don’t migrate downward. Attic Air Sealing is mandatory before we add insulation on any Envelope job - sealed first, then insulated, always.
Top Plate & Penetration Sealing
Signs you need it
You feel drafts at exterior wall outlets, see dust streaks on ceiling drywall near walls, or your blower-door test shows excessive leakage at the attic floor.
What it costs in Kirby
Sealing top plates, wire penetrations, and plumbing stacks in a typical Kirby ranch attic runs $1,200-$2,800.
How we do it
We locate every top plate joint and penetration with smoke pencils, seal with fire-rated caulk and foam, and verify with blower-door test comparison.
Can Light & Duct Boot Sealing
Signs you need it
Your recessed lights are original non-IC fixtures, you feel conditioned air escaping around ceiling vents, or summer humidity spikes when the AC runs.
What it costs in Kirby
Sealing or replacing can light housings and duct boots in a Kirby home typically ranges $800-$2,200.
How we do it
We install airtight LED retrofit housings or sealed covers over existing cans, then mastic-seal every duct boot to drywall with reinforced tape.
What Attic Air Sealing Costs in Kirby
| Item | Typical range in Kirby |
|---|---|
| Top plate and penetration sealing | $1,200 - $2,800 |
| Can light and duct boot sealing | $800 - $2,200 |
| Full attic air sealing package | $2,200 - $4,500 |
Will air sealing make my attic too hot?
No - we maintain ventilation paths at soffits and ridges; sealing stops air exchange between attic and living space, not attic ventilation.
Do you seal before or after insulation?
Always before. We never blow insulation over an unsealed attic floor - that buries leaks and makes them impossible to access later.
Wall Insulation in Kirby
Kirby’s 1960s-70s slab-on-grade ranches present a specific wall insulation problem: many were built with drywall directly against exterior brick veneer and an empty cavity in between, a construction shortcut common in military-adjacent speculative housing of that era. These homes read as insulated on paper but perform like tents in both summer heat and winter cold. Wall Insulation in Kirby requires probing and often interior access to solve what exterior appearance hides.
Injection Foam Wall Insulation
Signs you need it
Your exterior walls feel hot to the touch in summer, your HVAC runs constantly, or a probe hole reveals empty cavity space behind the drywall.
What it costs in Kirby
Injection foam for a typical 1,200-square-foot Kirby ranch with empty cavities runs $3,500-$6,500.
How we do it
We drill 5/8-inch holes at stud bay intervals, inject slow-rise foam that fills without bowing drywall, then patch and texture-match.
Drill & Fill Wall Insulation
Signs you need it
Your walls have some old batt insulation that has settled or degraded, or you need a more cost-effective solution than full foam injection.
What it costs in Kirby
Dense-pack cellulose or fiberglass drill-and-fill for a Kirby ranch ranges $2,500-$5,000.
How we do it
We drill access holes, blow material to calculated density with continuous fill verification, then seal and finish all penetrations.
What Wall Insulation Costs in Kirby
| Item | Typical range in Kirby |
|---|---|
| Injection foam (empty cavities) | $3,500 - $6,500 |
| Drill-and-fill dense pack | $2,500 - $5,000 |
| Exterior wall insulation with interior repair | $4,500 - $8,500 |
Will injection foam damage my walls?
We use slow-rise formulations and controlled pressure; drywall remains intact and we texture-match all patches.
Can you insulate walls without removing drywall?
Yes, drill-and-fill and injection methods require only small holes that we patch and paint - no gut renovation needed.
Attic Cleaning & Rodent Proofing in Kirby
Kirby’s mature tree canopy and aging soffit construction create entry points that squirrels, rats, and raccoons exploit - and once inside a 1960s attic with original fiberglass, they compress insulation, contaminate it with urine and feces, and chew wiring. We don’t clean attics without also excluding the animals; otherwise the problem returns before the smell fades. Attic Cleaning & Rodent Proofing in Kirby includes both remediation and prevention.
Attic Sanitizing & Decontamination
Signs you need it
You smell ammonia or mustiness from ceiling penetrations, see staining on drywall, or have found dead rodents or nesting material in the attic.
What it costs in Kirby
Full attic decontamination with antimicrobial treatment and HEPA cleanup in a Kirby ranch runs $1,500-$3,200.
How we do it
We remove all contaminated material, HEPA-vacuum every surface, apply enzyme-based sanitizer, and install new insulation to spec.
Rodent Proofing & Exclusion
Signs you need it
You hear scratching in walls or ceiling, see gnaw marks on soffits or vents, or have had repeated trapping without solving the entry problem.
What it costs in Kirby
Comprehensive rodent exclusion for a typical Kirby ranch, including soffit repair and vent screening, ranges $1,200-$2,800.
How we do it
We inspect every potential entry with borescope cameras, seal with rodent-proof materials, install chew-proof vent screens, and guarantee the exclusion.
What Attic Cleaning & Rodent Proofing Costs in Kirby
| Item | Typical range in Kirby |
|---|---|
| Attic sanitizing and decontamination | $1,500 - $3,200 |
| Rodent proofing and exclusion | $1,200 - $2,800 |
| Full attic restoration (cleaning + exclusion + insulation) | $3,500 - $7,500 |
How do you know where rodents are entering?
We use borescope cameras in soffits and ridge gaps, plus UV light tracing for urine paths - visual inspection alone misses most entry points.
Will rodents chew through spray foam?
Yes, which is why we use galvanized mesh, concrete patch, and metal flashing at entry points - never foam alone for exclusion.
Home Energy Audit in Kirby
A home energy audit in Kirby reveals what decades of incremental repairs and original construction shortcuts have hidden: empty wall cavities, unsealed attic floors, duct leakage in 150°F attics, and moisture migration from crawl spaces. The audit gives you a ranked list of improvements with expected savings, so you’re not guessing which investment returns first. Home Energy Audit is where every significant Kirby job should begin.
Blower Door Test
Signs you need it
Your home feels drafty despite closed windows, your energy bills are high for the square footage, or you’re planning insulation work and need a baseline.
What it costs in Kirby
A standalone blower-door test with full report for a Kirby home runs $350-$650.
How we do it
We depressurize the house to 50 Pascals, measure CFM50 leakage, and use smoke pencils to locate every significant leak path.
Thermal Imaging Inspection
Signs you need it
You have uneven temperatures room-to-room, suspect missing insulation in walls, or need to verify insulation quality before buying a Kirby home.
What it costs in Kirby
Thermal imaging as part of a full audit or standalone inspection ranges $250-$550 in Kirby.
How we do it
We scan with FLIR cameras during controlled temperature differential, marking every thermal bridge, gap, and moisture anomaly on annotated images.
What Home Energy Audit Costs in Kirby
| Item | Typical range in Kirby |
|---|---|
| Blower-door test with written report | $350 - $650 |
| Thermal imaging inspection | $250 - $550 |
| Full home energy audit (blower door + thermal + duct test) | $600 - $1,200 |
How long does a home energy audit take?
Plan three to four hours for a full audit; we need temperature differential for accurate thermal imaging and time to access attic and crawl.
Will the audit tell me what to fix first?
Yes - you receive a ranked improvement list with estimated savings and payback periods, not a generic recommendation sheet.
Brands We Service in Kirby
We source materials from Owens Corning, Johns Manville, Knauf, and other major manufacturers - no proprietary lock-in means we specify what’s right for your home, not what’s in our warehouse. Our San Antonio office stocks common batt, blown-in, and spray foam formulations for Kirby jobs, with next-day availability on most products. See our brands for full specifications.
Pricing for Insulation in Kirby, TX
| Service | Typical range in Kirby |
|---|---|
| Crawl space vapor barrier | $1,200 - $2,800 |
| Full crawl space encapsulation | $3,500 - $6,500 |
| Radiant barrier (attic foil) | $1,500 - $3,200 |
| Radiant barrier roof deck coating | $2,000 - $4,500 |
| Standard insulation removal | $1,200 - $2,500 |
| Contaminated insulation removal | $1,800 - $3,500 |
| Vermiculite removal with abatement | $3,500 - $7,500 |
| Attic air sealing (top plates) | $1,200 - $2,800 |
| Can light and duct boot sealing | $800 - $2,200 |
| Injection foam wall insulation | $3,500 - $6,500 |
| Drill-and-fill wall insulation | $2,500 - $5,000 |
| Full home energy audit | $600 - $1,200 |
Prices in Kirby trend toward the higher end when we find empty wall cavities, vermiculite, or extensive rodent damage - conditions common in this 1950s-1970s housing stock. Every job still begins with a written price before any work starts, under Haven Standard Clause 1.
Neighborhoods We Serve in Kirby
Kirby’s compact footprint means we can reach any address within 15 minutes of dispatch from our San Antonio office. These are the areas we work most often:
- Kirby Manor
- Old Town Kirby
- Kirby Terrace
- Forest Pines
- Springwood
Service Area - Cities Near Kirby
We serve Kirby directly and coordinate with homeowners in surrounding communities. Our crews also work in Converse, TX, Universal City, TX, Live Oak, TX, and Windcrest, TX - all within the same metro dispatch zone.
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 About Insulation in Kirby
Kirby follows Bexar County permit requirements; most insulation retrofits don’t require permits, but spray foam and structural modifications may. We handle permit research and documentation as part of our written scope when needed.
Most Kirby homeowners get an appointment within three to five business days; emergency situations like post-storm water damage move faster. A live person answers calls 24/7 to coordinate.
Kirby has minimal HOA coverage given its age and working-class housing stock, but we provide written scopes and photo documentation that satisfy any association review requirements when they exist.
Ready to see what your home’s envelope is actually doing? Call (830) 420-0953 for a free estimate. We’ll deliver a written price before any work starts, and you’ll walk away with a Documented Photo Record and, on applicable jobs, before-and-after blower-door numbers that prove the result.
What happens when you call
- 1A real person answersNo phone trees - talk to a local insulation pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3A background-checked tech heads outLicensed & insured, typically same-day.
- 4You approve before work beginsNothing starts until you say go.
What Kirby Customers Say
"Two other companies quoted to blow more insulation on top of what was there. These were the only ones who said the existing material had to come out first, and explained why."
- Clifford E."The winter gas bill dropped by about a third. They had estimated a quarter, so they under-promised."
- Genevieve R."They photographed rodent damage in the old insulation that we had no idea about, and priced the exclusion work separately so we could decide."
- Harriet N.