Insulation in Kirby, TX
Crawl space encapsulation and vapor barrier work in Kirby runs $2,800-$6,500 for most homes, with full encapsulations on larger crawl spaces reaching the upper end. Nearly every house in this landlocked enclave was built between the 1940s and 1970s to minimal standards, which means crawl spaces that were never properly sealed against Bexar County’s persistent humidity. We’re Envelope Insulation Co., and we treat air sealing as a hard prerequisite before any insulation goes in. Call (830) 529-7780 for a written price before any work starts.
Why Kirby Homes Are Different
Kirby is fully built-out and landlocked, entirely surrounded by San Antonio, with virtually no new construction since the 1970s. The housing stock is dominated by modest slab-on-grade ranch homes and small bungalows built for working-class and military-adjacent families near east San Antonio’s defense installations. Many still have original fiberglass batts that have settled and lost R-value, and wall cavities in the oldest homes were often left entirely uninsulated.
Summer attic temperatures in Kirby routinely exceed 150°F, and the humid subtropical climate makes vapor management as critical as R-value. Improperly installed or faced batts in these older homes create ideal conditions for mold growth behind walls. In Kirby’s ranch homes, we regularly find flexible ductwork running through unconditioned attics with little to no duct wrap insulation, so even a newly upgraded attic floor still bleeds conditioned air before it reaches living spaces.
Our Main Kirby Services
Kirby homeowners call us most often for attic work and spray foam retrofits in these aging homes. Here are the three services we route to dedicated Kirby pages:
Attic Insulation in Kirby
Attic insulation in Kirby means retrofitting homes that were built to 1940s-1970s standards, often with original batts that have compressed to half their labeled thickness. We remove the degraded material, seal all top plates and penetrations, then install new insulation to current IECC levels. Every job gets a written price first and a Documented Photo Record at completion. Attic Insulation in Kirby covers full project details and pricing.
Spray Foam Insulation in Kirby
Spray foam is often the right choice for Kirby’s oldest homes with uninsulated wall cavities or open crawl spaces, where conventional batts cannot create a complete air barrier. We use closed-cell foam in moisture-vulnerable areas and open-cell where breathability matters, sourced from Demilec and Icynene. Before-and-after blower-door numbers are published on every applicable job. Spray Foam Insulation in Kirby has full specifications.
Blown-In Insulation in Kirby
Blown-in cellulose from GreenFiber or fiberglass from Owens Corning lets us fill irregular joist bays and cover over settled old batts without full removal in some Kirby attics. The material conforms around wiring, pipes, and uneven framing common in these older homes. We air seal first, then blow to the target depth. Blown-In Insulation in Kirby explains when this approach fits.
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.
Crawl Space Encapsulation & Vapor Barrier in Kirby
Kirby’s slab-on-grade ranches often have small crawl spaces or perimeter foundations that were never sealed against ground moisture, and the humid subtropical climate here means standing water and musty odors are common complaints. A proper Crawl Space Encapsulation & Vapor Barrier installation stops vapor drive at the source, protects floor joists from rot, and can lower cooling loads by reducing the humidity that air conditioners must remove.
Crawl Space Vapor Barrier
Signs you need it
You notice musty smells rising from floor registers, soft spots in subflooring, or condensation on ductwork in the crawl space during Kirby’s humid spring and fall months.
What it costs in Kirby
A 6-mil to 20-mil vapor barrier installed over bare earth in a Kirby crawl space typically runs $2,800-$4,200 depending on square footage and pier spacing.
How we do it
We clear debris, level the ground, seam-seal polyethylene sheeting at all overlaps, and mechanically fasten it to foundation walls to create a continuous moisture break.
Crawl Space Encapsulation
Signs you need it
Your crawl space has standing water after rains, visible mold on joists, or insulation falling from the overhead due to moisture saturation.
What it costs in Kirby
Full encapsulation with sealed vapor barrier, insulated foundation walls, and conditioned air supply in Kirby homes ranges from $4,500-$6,500 for typical ranch footprints.
How we do it
We install a reinforced liner on floor and walls, seal all vents and penetrations, add perimeter drainage if needed, and introduce dehumidification or conditioned air per the home’s HVAC configuration.
What Crawl Space Encapsulation & Vapor Barrier Costs in Kirby
| Item | Typical range in Kirby |
|---|---|
| Vapor barrier (6-20 mil, earth cover only) | $2,800-$4,200 |
| Full encapsulation with wall sealing | $4,500-$6,500 |
| Encapsulation with dehumidifier add-on | $5,500-$7,800 |
How long does crawl space encapsulation take in Kirby?
Most Kirby jobs finish in two to three days: one day for prep and drainage, one for liner installation, and a partial day for final sealing and testing. We deliver a written scope and warranty before starting, per Haven Standard Clause 1.
Will encapsulation fix my musty smell?
Yes, when the source is ground moisture vapor; we verify this with a humidity reading before quoting, and our Documented Photo Record shows the condition before and after. Call (830) 529-7780 for a free assessment.
Radiant Barrier Installation in Kirby
Kirby’s 150°F+ attic temperatures and older homes with little to no original radiant protection make this one of the highest-ROI retrofits we offer in the city. A Radiant Barrier Installation reflects infrared heat rather than absorbing it, which directly reduces the radiant heat gain that makes these ranch homes’ cooling systems run continuously from May through October.
Attic Radiant Barrier
Signs you need it
Your ceiling is hot to the touch on summer afternoons, your AC runs non-stop after 2 PM, or your upstairs rooms stay 8-12 degrees warmer than the thermostat setting.
What it costs in Kirby
Radiant barrier foil stapled to attic rafters in a typical Kirby ranch runs $1,800-$3,200 depending on attic complexity and accessibility.
How we do it
We install perforated radiant barrier foil across the underside of roof decking or rafters, maintaining ventilation channels and ensuring at least one inch of air space for the reflective surface to function.
Radiant Barrier Roof Deck
Signs you need it
You’re replacing your roof and want the radiant barrier integrated at the deck level rather than retrofitting foil later, or your current shingles are failing prematurely from excessive heat buildup.
What it costs in Kirby
Radiant barrier roof deck installation during re-roofing in Kirby typically adds $2,200-$4,000 to the roofing project for material and labor.
How we do it
We install reflective sheathing or foil-faced decking during the roof replacement, creating a permanent radiant barrier that won’t sag or tear like stapled foil can over time.
What Radiant Barrier Installation Costs in Kirby
| Item | Typical range in Kirby |
|---|---|
| Attic radiant barrier foil (retrofit) | $1,800-$3,200 |
| Radiant barrier roof deck (during re-roof) | $2,200-$4,000 |
| Radiant barrier with attic air sealing package | $2,800-$4,800 |
Does radiant barrier really work in humid climates?
Yes, because radiant heat transfer operates independently of air temperature or humidity; the barrier reflects infrared energy before it enters the conditioned space, and we verify reduced attic temperatures with infrared cameras on every job.
Can you install radiant barrier without removing my insulation?
Absolutely, we staple foil to rafters above existing insulation in most Kirby retrofits, though we always air seal the attic floor first so the barrier doesn’t trap moisture against the ceiling drywall.
Insulation Removal & Replacement in Kirby
Kirby’s 1940s-1970s housing stock means we regularly remove insulation that has exceeded its useful life, been compromised by rodents, or was never adequate to begin with. Insulation Removal & Replacement in these older homes often reveals unsealed top plates, degraded ductwork, and evidence of past roof leaks that need addressing before new material goes in.
Attic Insulation Removal
Signs you need it
Your attic insulation is compressed below the joist tops, shows water staining, or has been disturbed by previous pest activity leaving droppings and tunnels.
What it costs in Kirby
Removal and disposal of old attic insulation in a typical Kirby ranch runs $1,500-$2,800, with HEPA containment and bag-out procedures included.
How we do it
We set up negative air machines, remove material in sealed bags, HEPA-vacuum all surfaces, and inspect the deck for leaks or structural issues before any new insulation is specified.
Contaminated Insulation Removal
Signs you need it
You smell urine or decay when the HVAC runs, see rodent droppings in the attic, or your insulation has visible mold growth from past roof leaks or condensation.
What it costs in Kirby
Contaminated removal with full sanitizing in Kirby homes ranges from $2,200-$4,000 depending on contamination extent and whether decking needs replacement.
How we do it
We treat affected areas with EPA-registered sanitizer, remove all compromised material under containment, and provide photo documentation of the cleaned substrate before replacement begins.
What Insulation Removal & Replacement Costs in Kirby
| Item | Typical range in Kirby |
|---|---|
| Standard attic insulation removal | $1,500-$2,800 |
| Contaminated insulation removal with sanitizing | $2,200-$4,000 |
| Removal + replacement with new blown-in | $3,500-$6,000 |
Do I have to leave during insulation removal?
No, our containment and negative air setup keeps living spaces isolated, though we recommend sensitive individuals plan to be out for the removal portion as a precaution.
How do I know if my old insulation is dangerous?
We test suspect material before disturbing it; vermiculite and pre-1990s loose-fill may contain asbestos, and we use certified abatement partners when needed. Call (830) 529-7780 for testing.
Attic Air Sealing in Kirby
In Kirby’s older homes, the attic floor is typically a sieve of unsealed top plates, plumbing and electrical penetrations, and can light housings that were never designed to be airtight. Attic Air Sealing is the single most cost-effective improvement we make in these houses, and we never install new insulation over an unsealed attic floor.
Top Plate & Penetration Sealing
Signs you need it
You feel drafts from outlets and switch plates on exterior walls, or your blower-door test shows excessive air leakage despite seemingly intact windows and doors.
What it costs in Kirby
Sealing top plates, wire penetrations, and plumbing stacks in a typical Kirby attic runs $1,200-$2,400 depending on framing complexity and accessibility.
How we do it
We use two-part expanding foam and acoustic sealant to bridge gaps between top plates and drywall, seal around all MEP penetrations, and verify with blower-door testing before and after.
Can Light & Duct Boot Sealing
Signs you need it
Your can lights flicker in windy weather, you see dust streaks around ceiling fixtures, or rooms at the end of duct runs never reach set temperature.
What it costs in Kirby
Sealing can light housings with fire-rated covers and mastic-sealing duct boots in Kirby homes typically costs $800-$1,800 depending on fixture count and duct configuration.
How we do it
We install pre-formed fire-rated enclosures over IC and non-IC cans, seal with fire-rated caulk, and apply mastic to all duct connections and boots to stop conditioned air loss.
What Attic Air Sealing Costs in Kirby
| Item | Typical range in Kirby |
|---|---|
| Top plate and penetration sealing | $1,200-$2,400 |
| Can light and duct boot sealing | $800-$1,800 |
| Full attic air sealing package | $2,000-$3,800 |
Will air sealing alone lower my electric bill?
Yes, typically 10-20% in Kirby’s older homes, because you’re no longer paying to condition air that escapes directly to the attic; we document the exact reduction with before-and-after blower-door numbers.
Do you seal before or after adding insulation?
Always before, per our sealed-first-then-insulated protocol; we will never blow insulation over an unsealed attic floor, as that buries the leaks and makes future access nearly impossible.
Wall Insulation in Kirby
Kirby’s pre-1970s homes frequently have empty wall cavities or original batts that have settled to ineffective levels, and the minimal construction standards of that era left many exterior walls completely uninsulated. Wall Insulation retrofit in these homes requires methods that don’t require full gut renovation, which we accomplish through targeted injection and drill-and-fill techniques.
Drill & Fill Wall Insulation
Signs you need it
Your exterior walls are cold to the touch in winter, you have no insulation visible in outlet boxes, or your home was built before 1965 and never had wall insulation added.
What it costs in Kirby
Drill-and-fill with cellulose or fiberglass in a typical Kirby ranch runs $2,500-$4,500 for exterior walls, with interior patching and painting included.
How we do it
We drill 2-inch holes at stud bay intervals, blow material to verified density, then patch with matching texture and paint so the repair disappears.
Injection Foam Wall Insulation
Signs you need it
You need higher R-value in limited cavity depth, have irregular stud spacing common in 1940s-1950s Kirby construction, or want air sealing alongside insulation in one step.
What it costs in Kirby
Injection foam for exterior walls in Kirby homes typically ranges from $3,500-$6,000 depending on wall area and foam density specified.
How we do it
We inject slow-rise foam through controlled ports, monitor expansion to prevent bowing of existing drywall, and trim excess after full cure before patching access holes.
What Wall Insulation Costs in Kirby
| Item | Typical range in Kirby |
|---|---|
| Drill-and-fill (cellulose or fiberglass) | $2,500-$4,500 |
| Injection foam (exterior walls) | $3,500-$6,000 |
| Interior wall soundproofing (selected rooms) | $1,800-$3,200 |
Will drill-and-fill damage my walls?
The access holes are small and strategically placed; we patch, texture-match, and prime so repairs are invisible, and we guarantee the finish under our 365-Day Done Right Promise.
Can you insulate walls without removing drywall?
Yes, that’s the entire point of drill-and-fill and injection methods; we access cavities from the exterior where possible or through minimal interior holes where siding doesn’t allow.
Attic Cleaning & Rodent Proofing in Kirby
Kirby’s mature tree canopy and aging soffit construction create entry points that newer suburban developments don’t face, and we’ve found active infestations in roughly one-third of the attics we open in this city. Attic Cleaning & Rodent Proofing here means more than removal; it means finding every entry point and sealing it with materials rodents can’t chew through.
Rodent Proofing & Exclusion
Signs you need it
You hear scratching at night, find droppings in the attic or insulation, or see gnaw marks on soffit vents and roofline fascia.
What it costs in Kirby
Comprehensive rodent proofing with one-way exits and sealing in a typical Kirby home runs $1,800-$3,200, with follow-up inspection included.
How we do it
We install one-way doors on active entry points, seal all gaps larger than 1/4 inch with steel mesh and concrete, and verify exclusion with a second inspection after two weeks.
Attic Sanitizing & Decontamination
Signs you need it
You smell ammonia or decay, see urine stains on decking, or have had rodents present long enough that insulation is saturated with waste.
What it costs in Kirby
Full attic sanitizing with enzyme treatment and HEPA cleanup in Kirby homes ranges from $2,000-$3,800 depending on contamination area and insulation removal needs.
How we do it
We remove contaminated material, apply enzyme digester to affected substrates, HEPA-vacuum all surfaces, and provide photo documentation of the sanitized space before any new work begins.
What Attic Cleaning & Rodent Proofing Costs in Kirby
| Item | Typical range in Kirby |
|---|---|
| Rodent proofing and exclusion | $1,800-$3,200 |
| Attic sanitizing and decontamination | $2,000-$3,800 |
| Full attic restoration (cleanout + proofing + re-insulation) | $4,500-$8,000 |
How do you find all the entry points?
We perform a full exterior inspection at roofline, soffit, and foundation levels, then verify with interior attic examination; our Documented Photo Record shows every sealed point for your reference.
Will rodents come back after you seal?
Not through the same openings; our steel and concrete materials resist chewing, and we guarantee the exclusion work for one year with free re-inspection if activity is suspected.
Home Energy Audit in Kirby
A Home Energy Audit in Kirby reveals the specific interaction of air leakage, insulation gaps, and duct losses that make these older homes expensive to cool through Bexar County’s six-month summer. We use the same diagnostic tools that utility programs require for rebate eligibility, and every audit ends with a written priority list ranked by cost-effectiveness.
Blower Door Test
Signs you need it
Your energy bills are 30% or more above neighbors with similar homes, you feel drafts despite closed windows, or you’re planning insulation work and want a baseline for improvement verification.
What it costs in Kirby
A standalone blower-door test with written report in Kirby runs $350-$550, or it’s included at no charge when you proceed with recommended work.
How we do it
We install a calibrated fan in an exterior door, depressurize the house to 50 Pascals, and measure CFM50 to quantify total envelope leakage and identify the largest leak paths with smoke pencils and infrared.
Thermal Imaging Inspection
Signs you need it
You have persistent cold or hot spots, suspect missing insulation behind walls, or want to verify the quality of previous insulation work before buying a Kirby home.
What it costs in Kirby
Thermal imaging as part of a full audit or standalone inspection in Kirby typically ranges from $250-$450 depending on square footage and reporting detail.
How we do it
We scan all building surfaces with a FLIR camera during controlled conditions, interpret thermal patterns to identify insulation voids, moisture intrusion, and air leakage, and annotate images in your written report.
What Home Energy Audit Costs in Kirby
| Item | Typical range in Kirby |
|---|---|
| Blower-door test with written report | $350-$550 |
| Thermal imaging inspection | $250-$450 |
| Full home energy audit (all diagnostics) | $450-$750 |
Is an energy audit worth it before insulating?
Yes, because without diagnostic data you’re guessing at solutions; our audits in Kirby regularly find that duct leakage, not attic insulation, is the primary cost driver, which changes the project scope entirely.
Do you provide the audit report same day?
We review preliminary findings on site and email the full written report with prioritized recommendations and estimated costs within 24 hours; the report includes all photos and blower-door numbers for your records.
Brands We Service in Kirby
We source materials from Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber with no proprietary lock-in, which means we specify what performs best for your specific Kirby home rather than pushing a house brand. Most common batts, blown-in, and spray foam products are stocked regionally with next-day availability. See our brands for full specifications.
Pricing for Insulation in Kirby, TX
| Service | Typical range in Kirby |
|---|---|
| Crawl space vapor barrier | $2,800-$4,200 |
| Full crawl space encapsulation | $4,500-$6,500 |
| Attic radiant barrier foil | $1,800-$3,200 |
| Radiant barrier roof deck | $2,200-$4,000 |
| Attic insulation removal | $1,500-$2,800 |
| Contaminated insulation removal | $2,200-$4,000 |
| Top plate and penetration sealing | $1,200-$2,400 |
| Can light and duct boot sealing | $800-$1,800 |
| Drill-and-fill wall insulation | $2,500-$4,500 |
| Injection foam wall insulation | $3,500-$6,000 |
| Rodent proofing and exclusion | $1,800-$3,200 |
| Full home energy audit | $450-$750 |
Prices in Kirby trend toward the higher end when attics have limited access hatches, when knob-and-tube wiring requires careful workarounds, or when multiple services are bundled and sequenced together. Every job still begins with a written price before any work starts, and our Free Second Opinion applies to any competing written estimate you bring us.
Neighborhoods We Serve in Kirby
We work across all of Kirby’s residential areas, from the original 1940s-1950s sections near FM 78 to the 1960s-1970s ranch developments closer to Binz-Engleman Road. Dispatch and scheduling are coordinated from our San Antonio office, and most Kirby appointments are available within 48 hours of your call.
- Kirby Terrace
- Forest Meadows
- Rolling Oaks
- Kirby Manor
- Windcrest-adjacent sections
Service Area - Cities Near Kirby
We serve Kirby homeowners directly and also work in the surrounding communities where similar housing stock and climate conditions create comparable insulation challenges. Our crews are regularly in Boerne, TX, Fair Oaks Ranch, TX, Scenic Oaks, TX, and Helotes, TX for retrofit and new-construction envelope work.
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 guidelines for most residential insulation retrofits; attic floor and wall insulation typically don’t require permits, but crawl space encapsulation with structural modifications or electrical work may. We handle permit research as part of our written scope when applicable, and we never start work without confirming requirements.
Most Kirby homeowners receive a next-day or within-48-hour appointment for estimates, and emergency situations like failed insulation with active moisture damage get same-day response when you call (830) 529-7780; a live person answers 24/7.
Kirby has minimal HOA coverage compared to master-planned suburbs, but if your neighborhood does have an architectural committee, we provide the written scope, material specifications, and photo documentation they typically require for approval before work begins.
Ready to see what your home’s envelope is actually doing? Call (830) 529-7780 for a free estimate with a written price before any work starts. We’ll bring the blower door, the thermal camera, and the Haven Standard documentation that lets you verify every claim we make.
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 within the hour.
- 4You approve before work beginsNothing starts until you say go.
What Kirby Customers Say
"Crawl space encapsulation done properly. Photographs of the vapour barrier at every seam, and the damp smell in the hallway is gone."
- Ainsley P."They air-sealed the attic floor before insulating and showed me the blower-door number before and after. The upstairs is finally the same temperature as downstairs."
- Marisol D."The winter gas bill dropped by about a third. They had estimated a quarter, so they under-promised."
- Genevieve R.