Insulation in Seguin, TX
Most crawl space encapsulation and vapor barrier jobs in Seguin run between $2,800 and $6,500 depending on foundation type and moisture severity, with full encapsulations on pier-and-beam homes in the older worker-cottage neighborhoods typically landing in the upper half of that range. We’re Envelope Insulation Co., and we treat air sealing as a hard prerequisite before any insulation goes in - a sequencing decision that matters especially in Seguin, where river-valley humidity wicks through unconditioned crawl spaces and destroys insulation from below. If you’re seeing damp floors, musty air, or energy bills that spike with every summer heat wave, call (830) 402-5240. We dispatch crews from our San Antonio office and serve Seguin homes with written prices before any work starts, documented photo records on every job, and before-and-after blower-door numbers when air sealing is part of the scope.
Why Seguin Homes Are Different
Seguin’s identity as an inland manufacturing town - anchored by facilities like Caterpillar and historically Continental General Tire - produced large blocks of modest mid-20th-century worker housing with minimal insulation, sitting in a Guadalupe River valley that routinely runs hotter than San Antonio due to its inland position and reduced Gulf-breeze influence. Then February 2021’s Winter Storm Uri exposed just how thermally vulnerable these same homes are in cold snaps, making Seguin’s retrofit insulation market unusually driven by dual-season urgency that neighboring I-10 suburbs, with newer construction, don’t share to the same degree.
The housing stock ranges from late-1800s Victorian-era homes in the historic downtown core to dense clusters of 1950s-1970s small worker cottages near industrial corridors, with a newer ring of 1990s-2010s tract subdivisions spreading north and west. Contractors working older worker-cottage neighborhoods near the industrial east side routinely find original fiberglass batts compressed and moisture-damaged from decades of river-valley humidity wicking through unconditioned crawl spaces and pier-and-beam foundations - a failure mode less common in the slab-on-grade new builds dominating neighboring Schertz or New Braunfels. Summer attic temperatures regularly push past 150°F, and the valley’s heat-retention effect offers little winter buffering, so insulation here must perform across aggressive heat gain and sudden severe freeze events.
Our Main Seguin Services
Seguin homeowners call us most often for attic work and spray foam applications; here’s what each involves in this market.
Attic Insulation in Seguin
Attic jobs in Seguin typically start with air sealing of top plates, can lights, and duct boots before any new material goes in - we won’t blow insulation over an unsealed attic floor. In the 1950s-1970s worker cottages near the east-side industrial corridors, we often find original batts compressed to half their labeled R-value from decades of heat cycling and humidity. We document the before-and-after blower-door reading so you can see the performance change. Attic Insulation in Seguin covers our full process and pricing.
Spray Foam Insulation in Seguin
Spray foam makes sense in Seguin’s newer tract subdivisions north and west, where open-cell foam in roof decks creates conditioned attics that eliminate the 150°F heat reservoir above living space. In older homes with pier-and-beam foundations, closed-cell foam on crawl space walls doubles as moisture barrier and insulation. We source from Owens Corning, Johns Manville, and Icynene - no proprietary lock-in, so we specify what’s right for the assembly. Spray Foam Insulation in Seguin has the details.
Blown-In Insulation in Seguin
Blown-in fiberglass or cellulose is the most cost-effective retrofit for Seguin’s uninsulated or under-insulated attics, especially in the 1990s-2010s subdivisions where truss spacing is consistent and access is straightforward. We use GreenFiber cellulose in some applications for its density and sound-dampening properties, and Knauf fiberglass in others where moisture risk is higher. Every job starts with sealing the attic floor; we publish the blower-door numbers so you can verify the result. Blown-In Insulation in Seguin explains our approach.
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 Seguin
Seguin’s river-valley humidity and concentration of pier-and-beam worker cottages make crawl space encapsulation and vapor barrier one of our most called-for services in this city. We routinely find original fiberglass batts hanging sodden from floor joists in homes near the industrial east side, where decades of ground moisture evaporation has destroyed both insulation and structural fasteners. Crawl Space Encapsulation & Vapor Barrier is our full service hub, but here’s how we handle Seguin specifically.
Crawl Space Vapor Barrier
Signs you need it
Your crawl space needs a vapor barrier if you notice damp soil, efflorescence on foundation walls, or floorboards that cup seasonally.
What it costs in Seguin
A 6-mil to 20-mil vapor barrier installed over bare earth in a Seguin crawl space typically runs $1,200-$2,800 for homes under 1,500 square feet, with thicker mil ratings and seam sealing adding 30-40%.
How we do it
We remove debris, grade the soil for drainage, lay overlapping sheets with sealed seams, and extend the barrier 6-12 inches up foundation walls before fastening and sealing to the wall surface.
Crawl Space Encapsulation
Signs you need it
Full encapsulation becomes necessary when humidity readings stay above 70% year-round, mold appears on joists, or HVAC ducts in the crawl space sweat condensation.
What it costs in Seguin
Complete encapsulation with sealed vapor barrier, wall insulation, conditioned air supply, and dehumidifier in a Seguin pier-and-beam home ranges from $4,500 to $9,500 depending on crawl space height and accessibility.
How we do it
We install a reinforced vapor barrier across floor and walls, seal all seams and penetrations with tape and mastic, insulate walls with rigid foam board, and add a dedicated dehumidifier sized to the volume.
What Crawl Space Encapsulation & Vapor Barrier Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Vapor barrier (6-20 mil, ground only) | $1,200 - $2,800 |
| Partial encapsulation (walls + ground) | $3,200 - $5,800 |
| Full encapsulation with dehumidifier | $4,500 - $9,500 |
How long does crawl space encapsulation take in Seguin?
Most Seguin encapsulations finish in 2-4 days; pier-and-beam homes with limited access or extensive joist repair need 5-7 days. We provide a written schedule with the price before work starts - Haven Standard Clause 1.
Will encapsulation stop my floors from feeling cold?
Yes, in most cases - sealing ground moisture and adding wall insulation raises the crawl space temperature 15-25°F, which reduces conductive heat loss through floors. Call (830) 402-5240 for a free assessment with exact numbers for your home.
Radiant Barrier Installation in Seguin
Seguin’s inland valley position pushes attic temperatures well above 150°F in summer, making radiant barrier installation one of the most cost-effective cooling-load reductions available to homeowners here. In the 1950s-1970s worker cottages with minimal original insulation, a radiant barrier paired with air sealing often drops attic heat gain by 20-30% before any new insulation is added. Radiant Barrier Installation covers our full methodology.
Attic Radiant Barrier
Signs you need it
Your attic needs a radiant barrier if second-story rooms stay 8-12°F hotter than downstairs, or if your AC runs continuously after 2 p.m. despite adequate insulation depth.
What it costs in Seguin
Radiant barrier foil stapled to rafters or laid over attic floor insulation in a typical Seguin home runs $1,800-$3,400 for attics under 2,000 square feet.
How we do it
We measure roof pitch and attic ventilation, install perforated foil across rafters with proper air gaps, and verify with infrared imaging that surface temperatures drop as specified.
Radiant Barrier & Ventilation
Signs you need it
Combined radiant barrier and ventilation upgrades make sense when your attic has fewer than 1 square foot of vent area per 150 square feet of floor space, or if soffit vents are blocked by insulation.
What it costs in Seguin
Radiant barrier plus balanced soffit-and-ridge ventilation installation in Seguin typically costs $2,800-$5,200 depending on roof complexity and existing vent adequacy.
How we do it
We air-seal the attic floor first, install baffles to maintain soffit airflow, add radiant barrier to rafters, and verify with a blower-door test that we haven’t created a pressure imbalance.
What Radiant Barrier Installation Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Radiant barrier foil (rafter or floor application) | $1,800 - $3,400 |
| Radiant barrier with ventilation upgrade | $2,800 - $5,200 |
| Radiant barrier roof deck (new construction or reroof) | $3,500 - $6,800 |
Does radiant barrier work with existing insulation?
Yes - it works best with existing insulation, reflecting radiant heat that conductive insulation cannot stop; we install it after air sealing and before adding any blown-in fill.
How much will my cooling bill drop?
Seguin homeowners with 150°F+ attics typically see 10-25% cooling-load reduction after radiant barrier and ventilation, with older homes at the higher end. Call (830) 402-5240 for a free estimate with projected savings.
Insulation Removal & Replacement in Seguin
Seguin’s river-valley humidity and aging worker-housing stock mean we remove more moisture-damaged insulation here than in neighboring slab-on-grade markets. In cottages near the industrial east side, we regularly pull out original fiberglass batts that have compressed to R-11 or lower, with black staining from decades of airborne dust and moisture cycling. Insulation Removal & Replacement details our containment and disposal process.
Contaminated Insulation Removal
Signs you need it
Insulation needs removal when you smell mustiness from the attic, see rodent droppings or nesting material, or find visible mold on batt surfaces.
What it costs in Seguin
Contaminated insulation removal with HEPA containment and disposal in a typical Seguin attic runs $2,200-$4,500 depending on contamination extent and attic square footage.
How we do it
We establish negative air pressure with HEPA filtration, remove material in sealed bags, HEPA-vacuum all surfaces, and apply antimicrobial treatment before any new insulation goes in.
Insulation Replacement
Signs you need it
Replacement follows removal when remaining insulation measures below R-19 in Seguin’s climate zone, or when batts are compressed more than 20% from original thickness.
What it costs in Seguin
New blown-in fiberglass or cellulose installed to R-38 in a Seguin attic after removal typically costs $2,800-$5,200 including air sealing of the attic floor.
How we do it
We air-seal top plates, can lights, and penetrations, install baffles at eaves, and blow new material to uniform depth with depth markers every 300 square feet for verification.
What Insulation Removal & Replacement Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Contaminated insulation removal only | $2,200 - $4,500 |
| Removal + replacement to R-38 | $4,500 - $8,800 |
| Vermiculite removal (asbestos testing required) | $6,500 - $12,000 |
Can you remove insulation with asbestos?
We do not remove vermiculite or asbestos-containing material ourselves; we coordinate certified abatement contractors, then resume with air sealing and new insulation once clearance testing passes.
How long does removal and replacement take?
Most Seguin attic removals finish in one day, with replacement and air sealing adding a second day; heavily contaminated spaces may need three days. We provide a written schedule with your price.
Attic Air Sealing in Seguin
Attic air sealing is the foundation of every insulation job we do in Seguin, and it’s especially critical in the worker-cottage neighborhoods where top plates were never sealed during original construction. A blower-door test on a typical 1960s Seguin home often reads 4,000-5,500 CFM50 before sealing, with 30-40% of that leakage passing through the attic floor alone. Attic Air Sealing explains our full protocol.
Top Plate & Penetration Sealing
Signs you need it
Your top plates need sealing if you feel drafts at exterior wall outlets in winter, or if infrared imaging shows cold stripes at ceiling perimeters on cold mornings.
What it costs in Seguin
Top plate and penetration sealing in a typical Seguin single-story home runs $1,400-$2,800, with two-story homes adding 40-60% due to increased linear footage.
How we do it
We remove existing insulation along top plates, apply two-part spray foam or acoustical sealant to all gaps, seal wire and pipe penetrations with fire-rated caulk, and verify with blower-door test before reinstalling insulation.
Can Light & Duct Boot Sealing
Signs you need it
Can lights and duct boots leak significantly if you see dust accumulation around ceiling fixtures, or if rooms farthest from the air handler stay 5°F different from thermostat readings.
What it costs in Seguin
Sealing can lights with pre-fabricated covers and mastic-sealing duct boots in a Seguin attic typically costs $900-$2,200 depending on fixture count and duct configuration.
How we do it
We install fire-rated covers over IC and non-IC can lights, seal cover-to-drywall joints with caulk, and apply mastic - not tape - to all duct boot connections before testing pressure balance.
What Attic Air Sealing Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Top plate and penetration sealing (single story) | $1,400 - $2,800 |
| Can light and duct boot sealing | $900 - $2,200 |
| Complete attic air sealing (all components) | $2,800 - $5,500 |
Will air sealing alone lower my bills?
Yes - a 30% reduction in CFM50 typically cuts heating and cooling costs 15-20% in Seguin’s climate, even before new insulation is added; we document the before-and-after number.
Do you seal before or after insulation?
Always before - we never blow insulation over an unsealed attic floor; sealing after would require removing material to access top plates. Call (830) 402-5240 for a free assessment.
Wall Insulation in Seguin
Seguin’s 1950s-1970s worker cottages were built with empty wall cavities or minimal R-11 batts that have settled or compressed over decades, making wall insulation one of the most impactful upgrades for homeowners in the historic core and east-side neighborhoods. In the Victorian-era downtown homes, we sometimes find no wall insulation at all - just lath and plaster against siding - which explains why these homes were among the hardest hit during Winter Storm Uri. Wall Insulation covers our techniques for each construction type.
Drill & Fill Wall Insulation
Signs you need it
Drill-and-fill makes sense when exterior walls feel cold to the touch in winter, or when you can hear outdoor conversations clearly through closed windows.
What it costs in Seguin
Drill-and-fill cellulose or fiberglass in a typical Seguin single-story home runs $2,800-$5,500, with two-story homes and hard-coat stucco exteriors at the upper end.
How we do it
We drill 2-inch holes at stud-bay intervals, blow material to verified density with a tube-fill method, plug holes with matching material, and texture-match stucco or siding repairs.
Injection Foam Wall Insulation
Signs you need it
Injection foam works best when walls have irregular cavities, balloon framing, or existing batts that cannot be removed without destructive demolition.
What it costs in Seguin
Injection foam wall insulation in Seguin typically costs $4,500-$8,500 for a full single-story envelope, with open-cell foam at the lower end and closed-cell at the upper.
How we do it
We access walls through interior drywall or exterior siding, inject slow-rise foam that fills around obstructions, trim excess after cure, and repair access points to match existing finish.
What Wall Insulation Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Drill-and-fill cellulose/fiberglass (single story) | $2,800 - $5,500 |
| Injection foam (open-cell, full envelope) | $4,500 - $6,800 |
| Injection foam (closed-cell, full envelope) | $6,500 - $8,500 |
Can you insulate walls without removing drywall?
Yes - drill-and-fill and injection foam both access wall cavities through small exterior or interior holes; we repair and match texture so the work is invisible.
Will wall insulation help with sound?
Dense-packed cellulose and injection foam both reduce exterior noise transmission 40-60%; we specify density for acoustic performance when that’s your priority. Call (830) 402-5240 to discuss your goals.
Attic Cleaning & Rodent Proofing in Seguin
Seguin’s mature tree canopy and river-valley ecosystem put attics in constant contact with squirrel, rat, and bat populations, especially in the older neighborhoods where soffit construction leaves gaps modern builds don’t have. We regularly find decades of accumulated droppings, compressed nesting material, and urine-saturated insulation in attics near the Guadalupe River corridor, where wildlife pressure is highest. Attic Cleaning & Rodent Proofing details our health-protocol approach.
Attic Sanitizing & Decontamination
Signs you need it
Your attic needs sanitizing if you smell ammonia when the HVAC runs, find droppings larger than rice grains, or see insulation disturbed with tunneling patterns.
What it costs in Seguin
Attic sanitizing and decontamination with HEPA vacuuming, enzyme treatment, and antimicrobial application in a typical Seguin attic runs $1,800-$3,800.
How we do it
We remove contaminated insulation, HEPA-vacuum all surfaces, apply enzyme digester to break down organic material, fog with antimicrobial, and provide a documented photo record of every stage.
Rodent Proofing & Exclusion
Signs you need it
Exclusion is necessary when you hear scratching in walls seasonally, find new droppings after prior cleanup, or see gnaw marks on soffit vents or fascia boards.
What it costs in Seguin
Rodent proofing with metal mesh, concrete patch, and one-way exit devices for a typical Seguin home runs $1,400-$3,200, with steep roofs and complex fascia adding labor.
How we do it
We inspect with infrared to find thermal bypasses rodents use, seal all entry points larger than 1/4 inch with rodent-proof materials, install one-way exits, and return to verify no new activity before final sealing.
What Attic Cleaning & Rodent Proofing Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Attic sanitizing and decontamination | $1,800 - $3,800 |
| Rodent proofing and exclusion | $1,400 - $3,200 |
| Full attic restoration (removal + sanitize + proofing + new insulation) | $5,500 - $11,000 |
Is rodent damage covered by insurance?
Most homeowner policies exclude rodent damage to insulation and wiring; we document everything with photos to support any claim you choose to file, but we don’t promise coverage.
How do you keep rodents out after cleaning?
We seal every entry point with rodent-proof materials - not spray foam, which they chew through - and guarantee our exclusion for one year with free return visits if activity resumes. Call (830) 402-5240 for a free inspection.
Home Energy Audit in Seguin
A home energy audit in Seguin is the starting point for every major envelope upgrade we recommend, and it’s especially valuable in the worker-cottage neighborhoods where multiple systems - unsealed attics, empty walls, damp crawl spaces - compound each other. Our blower-door tests on pre-1980 Seguin homes regularly reveal leakage rates double what modern code allows, with the worst performers losing conditioned air equivalent to an open window year-round. Home Energy Audit explains our full diagnostic protocol.
Blower Door Test
Signs you need it
You need a blower-door test if your energy bills exceed $0.12 per square foot annually, or if rooms vary more than 5°F from the thermostat setting despite adequate equipment capacity.
What it costs in Seguin
A standalone blower-door test with written report in Seguin costs $350-$650; we credit this toward any work we perform within 90 days.
How we do it
We install a calibrated fan in an exterior door, depressurize the house to 50 Pascals, measure CFM50 leakage, and use a smoke pencil to locate major leaks while the fan runs.
Thermal Imaging Inspection
Signs you need it
Thermal imaging reveals hidden issues when you suspect wall voids, need to verify insulation continuity after retrofit, or want to prioritize air-sealing locations before winter.
What it costs in Seguin
Thermal imaging added to a blower-door test in Seguin runs $200-$400 additional; combined diagnostic packages typically cost $450-$850.
How we do it
We run the blower door to create pressure differential, then scan with FLIR cameras to visualize missing insulation, air leakage paths, and moisture patterns in real time.
What Home Energy Audit Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Blower-door test with written report | $350 - $650 |
| Thermal imaging add-on | $200 - $400 |
| Full diagnostic audit (blower door + thermal + combustion safety + duct test) | $650 - $1,200 |
What does the audit report include?
You receive a written scope with prioritized recommendations, estimated savings per measure, blower-door CFM50 before and after any work we perform, and a documented photo record of all findings.
Can I use audit results for utility rebates?
Yes - our reports meet CPS Energy and Guadalupe Valley Electric Cooperative requirements; we include the specific documentation format each program needs. Call (830) 402-5240 to schedule.
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 assembly, not what’s in our warehouse. Most Seguin jobs draw from stock held at our San Antonio office, with next-day availability on standard items. our brands
Pricing for Insulation in Seguin, TX
| Service | Typical range in Seguin |
|---|---|
| Crawl space vapor barrier (ground only) | $1,200 - $2,800 |
| Full crawl space encapsulation | $4,500 - $9,500 |
| Radiant barrier foil installation | $1,800 - $3,400 |
| Contaminated insulation removal | $2,200 - $4,500 |
| Insulation removal + replacement to R-38 | $4,500 - $8,800 |
| Attic air sealing (complete) | $2,800 - $5,500 |
| Drill-and-fill wall insulation | $2,800 - $5,500 |
| Injection foam wall insulation | $4,500 - $8,500 |
| Attic sanitizing and decontamination | $1,800 - $3,800 |
| Rodent proofing and exclusion | $1,400 - $3,200 |
| Full home energy audit | $650 - $1,200 |
Prices in Seguin push higher when crawl spaces have limited headroom, walls have hard-coat stucco that requires careful repair matching, or attics contain vermiculite requiring asbestos testing. Every job begins with a written price - no work starts without it - and our 365-Day Done Right Promise applies to all completed work.
Neighborhoods We Serve in Seguin
We work across Seguin’s full housing spectrum, from historic downtown Victorians to the newest exurb subdivisions. Most calls are scheduled within 24-48 hours, with emergency response available for active leaks or post-storm damage.
- Historic Downtown Seguin (Victorian-era core)
- Industrial East Side (1950s-1970s worker cottages)
- Guadalupe River corridor neighborhoods
- North Seguin tract subdivisions (1990s-2010s)
- West Seguin exurb development
Service Area - Cities Near Seguin
We serve Seguin directly and coordinate with homeowners in New Braunfels, TX, Cibolo, TX, Schertz, TX, and Universal City, TX for multi-property projects or referrals. Dispatch and scheduling run from our San Antonio office; crews are routed to Seguin daily.
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
Seguin requires permits for spray foam applications and any structural modification; attic insulation retrofits and air sealing typically do not need permitting if no structural members are altered. We handle permit applications as part of our scope when required - it’s noted in your written price.
We maintain emergency capacity for freeze-damaged insulation and burst-pipe aftermath; our live-answer line routes Seguin calls directly to dispatch, and we typically inspect within 24 hours of storm events.
Seguin’s inland valley position creates more extreme summer heat and less freeze protection than San Antonio’s slightly moderated climate, while the older worker-housing stock has minimal original insulation and pier-and-beam foundations that slab-on-grade new builds don’t share. We specify for both conditions.
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 Seguin Customers Say
"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."Turned up on time, protected the hallway, and the written scope matched what was actually done."
- Bruno S."The winter gas bill dropped by about a third. They had estimated a quarter, so they under-promised."
- Genevieve R.