Insulation in Seguin, TX
Crawl space encapsulation and vapor barrier installation in Seguin typically runs $2,800-$6,500 for most homes, with jobs completed in one to two days. We’re Envelope Insulation Co., and we’ve sealed and insulated more than 9,000 homes since 2016 under The Haven Standard - every one starting with a written price and ending with a documented photo record. In Seguin, the Guadalupe River valley’s persistent humidity and the wide span from historic limestone homes to new production builds means crawl space moisture control isn’t optional; it’s structural preservation. Call (737) 227-6219 for a free estimate with upfront pricing.
Why Seguin Homes Are Different
Seguin’s housing market spans an unusually wide gap. In the historic core near the courthouse square, mid-1800s German-settler limestone masonry homes have wall assemblies with virtually no thermal cavity - spray foam or interior rigid board are essentially the only retrofit options. Surrounding that core are 2010s-2020s production subdivisions built quickly for Continental AG tire plant workers, most finished with only builder-minimum R-19 attic and R-30 ceiling insulation.
This dual-era split, amplified by the Guadalupe River valley’s humidity, keeps both retrofit and upgrade demand constant in ways that don’t apply to purely modern boomtowns. Winter Storm Uri in February 2021 exposed catastrophic insulation failures across Guadalupe County, and post-storm attic and pipe-chase upgrades remain a persistent driver. Seguin sits in IECC Climate Zone 2, where summer heat pushes past 100°F and humidity stays elevated - a combination that makes radiant barriers and air sealing as critical as raw R-value.
Our Main Seguin Services
Seguin homeowners call us most often for attic work and spray foam; here’s what each involves locally.
Attic Insulation in Seguin
Most Seguin attics we inspect - especially in 2000s-era production homes off Highway 46 and FM 78 - carry R-30 or less, well below what’s cost-effective for Zone 2 cooling loads. We air seal first, then insulate, with before-and-after blower-door numbers published on every job. Attic Insulation in Seguin covers the full scope, from top-plate sealing to blown-in or batt upgrades over sealed attic floors.
Spray Foam Insulation in Seguin
For historic limestone homes near the courthouse square with no stud cavities, spray foam on the attic deck or interior rigid board are the only practical paths to code-compliant thermal performance. In newer builds, open-cell spray foam seals rim joists and bonus-room kneewalls where batts fail. Spray Foam Insulation in Seguin details material options from Demilec and Icynene.
Blown-In Insulation in Seguin
Blown-in fiberglass or cellulose is the most common retrofit for Seguin’s wood-framed attics, but we never blow over an unsealed floor. Top plates, can lights, and duct boots get sealed first - Haven Standard Clause 1. Blown-In Insulation in Seguin explains the full prep-and-install sequence.
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 Seguin
Seguin’s Guadalupe River valley location means crawl space humidity runs high year-round, and the 2010s-2020s production homes built for Continental AG workers often have minimal ground sealing. We’ve encapsulated crawl spaces from the historic district to new subdivisions near Kingsbury, and every job starts with a written price and closes with a documented photo record. Crawl Space Encapsulation & Vapor Barrier covers our full approach.
Crawl Space Vapor Barrier
Signs you need it
Your crawl space has standing water after rain, musty odors rising through floor registers, or fiberglass batts hanging sodden from the joists.
What it costs in Seguin
A 6-mil or thicker vapor barrier installed over bare ground in a Seguin crawl space typically runs $1,200-$2,800 depending on square footage and pier spacing.
How we do it
We remove debris, grade the ground, lay and seam-seal polyethylene sheeting, and seal it to foundation walls - then photograph every seam before closing.
Crawl Space Encapsulation
Signs you need it
Your hardwood floors cup, your HVAC runs constantly in summer, or your energy bills spike despite moderate thermostat settings.
What it costs in Seguin
Full encapsulation with vapor barrier, wall insulation, sealed vents, and dehumidifier readiness in Seguin typically ranges $3,500-$8,500 for homes under 2,500 square feet.
How we do it
We seal all vents, install rigid foam or closed-cell spray foam on walls, lay a sealed ground barrier, and condition the space - with blower-door verified results when the envelope connects to living space.
What Crawl Space Encapsulation & Vapor Barrier Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Vapor barrier (ground only) | $1,200 - $2,800 |
| Partial encapsulation (walls + ground) | $2,800 - $5,200 |
| Full encapsulation with conditioning prep | $4,500 - $8,500 |
How long does crawl space encapsulation take in Seguin?
Most Seguin encapsulations finish in one to two days; limestone foundation homes in the historic district may need an extra half-day for irregular wall prep. Call (737) 227-6219 for a written timeline with your estimate.
Will encapsulation help with summer humidity?
Yes - sealed and conditioned crawl spaces in Seguin’s Climate Zone 2 typically drop relative humidity below 60%, protecting floor systems and reducing HVAC runtime. We document before-and-after conditions with photos.
Radiant Barrier Installation in Seguin
Seguin’s summer heat routinely pushes past 100°F, and the shallow R-30 attic insulation common in 2000s-2020s production homes lets roof deck temperatures radiate directly into living space. A radiant barrier - reflective foil or paint applied to the roof deck or rafter bays - blocks that infrared heat transfer and can reduce cooling loads 5-10% in Zone 2. We’ve installed radiant barriers across Seguin, from historic district bungalows with vented attics to new builds near Kingsbury with complex rooflines. Radiant Barrier Installation details material specs from Johns Manville and Knauf.
Attic Radiant Barrier
Signs you need it
Your attic hits 140°F by midday, your second floor won’t cool below 78°F until after sunset, or your AC compressor runs non-stop July through September.
What it costs in Seguin
Foil radiant barrier installed to rafters or deck in a typical Seguin attic runs $1,100-$2,400 for homes under 2,500 square feet.
How we do it
We staple perforated foil across rafter bottoms or spray low-emissivity coating to the deck, maintaining ventilation paths and photographing coverage before closing.
Radiant Barrier & Ventilation
Signs you need it
Your existing radiant barrier cooked off in the attic heat, or your soffit vents are blocked by insulation and attic temperature keeps climbing.
What it costs in Seguin
Radiant barrier plus ventilation correction - baffles, vent extension, or additional intake - typically runs $1,800-$3,600 in Seguin attics.
How we do it
We install baffles to preserve soffit airflow, then apply barrier material and verify with surface temperature readings documented in your photo record.
What Radiant Barrier Installation Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Foil radiant barrier (attic) | $1,100 - $2,400 |
| Radiant barrier with ventilation correction | $1,800 - $3,600 |
| Roof deck spray application | $1,500 - $3,200 |
Does radiant barrier work with existing insulation?
Yes - radiant barrier complements rather than replaces insulation; we install it after air sealing and before adding blown-in or batt layers. Call (737) 227-6219 for a combined scope and written price.
How long until I see lower bills?
Most Seguin homeowners notice reduced AC runtime within the first billing cycle; full savings stabilize after one summer season as the thermal mass adjusts.
Insulation Removal & Replacement in Seguin
Seguin’s humidity and post-Uri storm damage have left many attics with compressed, mold-contaminated, or waterlogged insulation - especially in 2000s-era production homes with original R-30 batts. Historic limestone homes near the courthouse square present a different problem: decades of vermiculite or rock wool that may contain asbestos and requires abatement-protocol removal. We remove and replace insulation across both housing eras, with every job starting from a written scope and closing with a documented photo record. Insulation Removal & Replacement covers our full protocol.
Contaminated Insulation Removal
Signs you need it
Your attic insulation smells musty, shows visible mold growth, or was soaked during a roof leak or plumbing failure and never dried.
What it costs in Seguin
Contaminated insulation removal and disposal in Seguin typically runs $1,500-$3,500 depending on square footage and contamination extent.
How we do it
We set negative air pressure, bag insulation in the attic, HEPA-vacuum the deck, apply antimicrobial treatment if needed, and photograph the clean deck before any new material goes in.
Insulation Replacement
Signs you need it
Your insulation is compressed below half its original thickness, has settled away from the attic deck, or tests well below current R-value for your zone.
What it costs in Seguin
Full removal and replacement with new blown-in or batt insulation in Seguin typically ranges $2,200-$5,500 for attics under 1,500 square feet.
How we do it
We remove old material, air seal the deck, install new insulation to specified depth, and verify with depth markers and photos - plus blower-door numbers when air sealing is included.
What Insulation Removal & Replacement Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Contaminated insulation removal | $1,500 - $3,500 |
| Vermiculite/legacy material removal | $3,500 - $7,500 |
| Removal + replacement with new insulation | $2,200 - $5,500 |
Can you remove insulation with asbestos?
We coordinate certified abatement contractors for vermiculite or asbestos-containing materials; we do not perform abatement ourselves but manage the handoff and reinsulate after clearance. Call (737) 227-6219 to discuss your specific material.
Do I have to leave during removal?
Most Seguin homeowners stay in place; we isolate the attic with plastic and negative pressure, and HVAC systems stay off during the removal phase as a precaution.
Attic Air Sealing in Seguin
Seguin’s 2010s-2020s production homes were built fast for Continental AG workers, and the attic floors typically leak at top plates, can lights, and duct boots - sometimes 4,000+ CFM50 before we start. Historic limestone homes have their own leakage paths: balloon framing, chimney chases, and gaps where modern additions meet stone walls. We air seal every attic with blower-door verification, because Envelope will never blow insulation over an unsealed floor. Attic Air Sealing explains the full protocol.
Top Plate & Penetration Sealing
Signs you need it
Your blower-door test shows excessive leakage at the ceiling plane, or you feel drafts at interior wall tops during winter cold snaps.
What it costs in Seguin
Top plate and penetration sealing in a typical Seguin attic runs $800-$1,800 as a standalone service, or is bundled into insulation upgrades.
How we do it
We access top plates by moving insulation, seal with caulk or foam, treat all wire and pipe penetrations, and verify the reduction with a mid-job blower-door test.
Can Light & Duct Boot Sealing
Signs you need it
Your recessed lights flicker in wind, your ducts blow attic air in summer, or IR camera shows hot spots around ceiling fixtures.
What it costs in Seguin
Sealing can lights with rated covers and mastic-sealing duct boots typically runs $600-$1,400 in Seguin attics with 8-15 fixtures.
How we do it
We install fire-rated covers over IC and non-IC cans, seal with foam, apply mastic to duct boots, and photograph every sealed point for your record.
What Attic Air Sealing Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Top plate & penetration sealing | $800 - $1,800 |
| Can light & duct boot sealing | $600 - $1,400 |
| Full attic air sealing (comprehensive) | $1,400 - $3,200 |
Will air sealing alone lower my bills?
Yes - a 30-50% reduction in attic leakage typically cuts HVAC runtime 10-20% in Seguin’s climate, though we recommend pairing with insulation for full performance. Call (737) 227-6219 for a combined scope.
How do you prove the sealing worked?
We publish before-and-after blower-door numbers on every job - a pressurization reading that shows, in one figure, how much conditioned air your home was losing before and after our work.
Wall Insulation in Seguin
Seguin’s historic limestone homes near the courthouse square have solid-masonry walls with no stud cavity - a situation rarely encountered in San Antonio’s wood-frame neighborhoods 35 miles west. Spray foam on the attic deck or interior rigid foam board are essentially the only code-compliant retrofit options. In the 2000s-2020s production homes, exterior walls often hold R-13 batts that have settled or were poorly installed during fast construction. We treat both conditions, with written scopes that specify the exact approach for your wall type. Wall Insulation covers all methods.
Injection Foam Wall Insulation
Signs you need it
Your exterior walls feel hot to the touch in summer, your rooms have large temperature swings, or an infrared scan shows empty cavities in framed walls.
What it costs in Seguin
Injection foam for exterior walls in a typical Seguin home runs $2,800-$6,500 depending on wall area and cavity condition.
How we do it
We drill 2-inch holes at stud bay intervals, inject slow-rise foam, patch with matching siding or interior drywall, and photograph filled cavities with borescope verification.
Exterior Wall Insulation
Signs you need it
Your historic limestone home has no wall cavity, or your framed walls test below R-13 and you need a thermal upgrade without interior demolition.
What it costs in Seguin
Exterior rigid foam board with rainscreen detail on Seguin homes typically ranges $4,500-$9,500 for partial or full wraps under 2,000 square feet.
How we do it
We attach rigid foam to exterior masonry or sheathing, detail flashing and drainage planes, and coordinate with siding contractors for the finish layer - documented at every stage.
What Wall Insulation Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Injection foam (framed walls) | $2,800 - $6,500 |
| Drill & fill (cellulose/dense-pack) | $2,200 - $5,200 |
| Exterior rigid foam board | $4,500 - $9,500 |
Can you insulate limestone walls without demolition?
Yes - interior rigid foam board with plaster or drywall finish, or exterior foam with new siding, are the two paths; we specify the approach in your written scope after site inspection. Call (737) 227-6219 to schedule.
Does wall insulation require permits in Seguin?
Interior insulation upgrades typically don’t; exterior foam board or any structural modification may trigger Guadalupe County permit requirements, which we handle as part of our scope documentation.
Attic Cleaning & Rodent Proofing in Seguin
Seguin’s mature oak canopy and river-adjacent neighborhoods create ideal rodent habitat, and we’ve found active infestations in attics from the historic district to new subdivisions off FM 78. Guadalupe County’s humidity then compounds the damage: compressed, urine-soaked insulation loses R-value and creates indoor air quality problems. We clean, sanitize, and rodent-proof attics with the same documentation standards as our insulation jobs - written scope, photo record, and 365-Day Done Right Promise. Attic Cleaning & Rodent Proofing details our full protocol.
Attic Sanitizing & Decontamination
Signs you need it
Your attic smells of ammonia, you find rodent droppings in insulation, or your family experiences unexplained respiratory symptoms.
What it costs in Seguin
Attic sanitizing and decontamination in Seguin typically runs $1,200-$2,800 depending on contamination area and insulation depth.
How we do it
We remove soiled insulation, HEPA-vacuum the deck, apply enzymatic sanitizer, and run air scrubbers until clearance - photographed and documented.
Rodent Proofing & Exclusion
Signs you need it
You hear scratching at night, find gnawed wires or ducts, or see daylight through roof junctions or soffit vents from inside the attic.
What it costs in Seguin
Rodent proofing with metal exclusion, vent guards, and gap sealing in Seguin attics typically ranges $900-$2,200.
How we do it
We inspect with borescope and ladder, seal all entry points 1/4-inch or larger with rodent-proof materials, install vent guards, and photograph every sealed location.
What Attic Cleaning & Rodent Proofing Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Attic sanitizing & decontamination | $1,200 - $2,800 |
| Rodent proofing & exclusion | $900 - $2,200 |
| Full attic restoration (cleanout + proofing + re-insulation) | $3,500 - $7,500 |
Do you remove dead rodents?
Yes - we locate and remove carcasses during cleanout, then sanitize the area; if the location is inaccessible, we document it and advise on structural access options. Call (737) 227-6219 for same-day scheduling.
How do you keep rodents from coming back?
We seal every entry point 1/4-inch or larger with metal, concrete, or hardware cloth - materials rodents can’t chew through - and photograph each location in your documented record.
Home Energy Audit in Seguin
A home energy audit in Seguin is particularly valuable because the city’s dual-era housing stock - historic limestone homes with no wall cavities and 2010s production builds with minimal attic insulation - requires completely different upgrade paths. The Guadalupe River valley’s humidity and Zone 2 cooling loads add further variables that generic advice misses. Our audits use blower-door testing, thermal imaging, and duct leakage measurement to pinpoint exactly where your home loses conditioned air and what fixes will pay back. Home Energy Audit details the full diagnostic suite.
Blower Door Test
Signs you need it
Your energy bills seem high for your home’s size, rooms have uneven temperatures, or you’re considering insulation upgrades and want to prioritize spending.
What it costs in Seguin
A standalone blower-door test with written report in Seguin typically runs $350-$650; it’s credited toward any work we perform.
How we do it
We mount a calibrated fan in an exterior door, depressurize the house to 50 Pascals, measure CFM50 leakage, and use smoke pencils to locate leaks - documented with photos and a written report.
Thermal Imaging Inspection
Signs you need it
You suspect missing insulation, want to verify contractor work, or need documentation for an insurance claim after Winter Storm Uri damage.
What it costs in Seguin
Thermal imaging bundled with a blower-door test typically adds $200-$400; standalone imaging runs $300-$550 in Seguin.
How we do it
We scan walls, ceilings, and foundations with an IR camera during blower-door depressurization to reveal temperature differentials that indicate air leaks or missing insulation - images included in your report.
What Home Energy Audit Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Blower-door test with written report | $350 - $650 |
| Thermal imaging inspection | $300 - $550 |
| Full audit (blower door + thermal + duct test) | $600 - $1,100 |
Will the audit tell me what to fix first?
Yes - your written report ranks findings by cost-effectiveness and comfort impact, with itemized pricing for each recommended measure. Call (737) 227-6219 to schedule; the audit fee credits to any work.
How long does a full audit take?
Most Seguin audits take 2.5-4 hours depending on home size and complexity; you receive the written report within 48 hours, with photos and blower-door numbers.
Brands We Service in Seguin
We source insulation and air-sealing materials from Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber - no proprietary lock-in means we specify what’s right for your home, not our inventory. Our San Antonio office stocks common batt and blown-in sizes for next-day Seguin availability. See our brands for full specifications.
Pricing for Insulation in Seguin, TX
| Service | Typical range in Seguin |
|---|---|
| Crawl space vapor barrier | $1,200 - $2,800 |
| Crawl space encapsulation (full) | $4,500 - $8,500 |
| Radiant barrier installation | $1,100 - $2,400 |
| Insulation removal (contaminated) | $1,500 - $3,500 |
| Insulation removal + replacement | $2,200 - $5,500 |
| Attic air sealing (full) | $1,400 - $3,200 |
| Wall insulation (injection foam) | $2,800 - $6,500 |
| Attic cleaning & rodent proofing | $900 - $2,200 |
| Home energy audit (full) | $600 - $1,100 |
Prices in Seguin push toward the higher end for homes with limited attic access, active moisture problems, or historic limestone construction requiring specialized approaches. Every job still begins with a written price before any work starts - Haven Standard Clause 1 - and we offer a Free Second Opinion on any competing written estimate.
Neighborhoods We Serve in Seguin
Our crews work throughout Seguin and surrounding Guadalupe County, with dispatch coordinated from our San Antonio office. Most Seguin appointments schedule within 48 hours, and emergency calls are answered by a live person 24/7.
- Historic District / Courthouse Square
- Kingsbury area subdivisions
- FM 78 corridor production homes
- Guadalupe River-adjacent neighborhoods
- Highway 46 eastside developments
Service Area - Cities Near Seguin
We serve the full I-35 and Highway 46 corridor, including New Braunfels, TX to the north, Cibolo, TX and Schertz, TX to the southwest, and Universal City, TX to the south. Every service area job follows the same Haven Standard: written price first, documented record last, 365-Day Done Right Promise on all completed work.
Serving Seguin, TX - Our Local Coverage Area
We’re based in the Seguin 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 Seguin
Interior attic and wall insulation upgrades typically don’t require permits in Guadalupe County; exterior foam board, structural modifications, or asbestos abatement may. We handle permit research and filing as part of our written scope when required.
Most Seguin appointments book within 48 hours; emergency calls for water-damaged or contaminated insulation are answered live 24/7 and scheduled same-day or next-day depending on crew availability.
Yes - we’ve retrofitted multiple German-era limestone homes near the courthouse square using spray foam on attic decks or interior rigid foam board, the only practical paths for walls with no stud cavity. Each scope is written to the specific construction.
Call (737) 227-6219 today for a free estimate with upfront pricing. Every Seguin job starts with a written scope and ends with a documented photo record - and on applicable work, you’ll receive before-and-after blower-door numbers showing exactly what changed.
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 Seguin Customers Say
"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."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.