Insulation in Seguin, TX
Crawl space encapsulation and vapor barrier installation in Seguin typically runs $2,800-$6,500 for most pier-and-beam homes, with jobs on the river side of town often requiring enhanced moisture control. We’re Envelope Insulation Co., and we treat air sealing as a prerequisite, not an upsell, on every job we take in Guadalupe County. If your floors feel cold in January or your crawl space smells musty by April, call us at (830) 243-6352 - we’ll give you a written price before any work starts.
Why Seguin Homes Are Different
Seguin sits in IECC Climate Zone 2, hot-humid, with the Guadalupe River pushing local relative humidity higher than surrounding upland towns. That moisture changes what insulation materials make sense here.
The housing stock is split. Near the historic courthouse square, late-19th and early-20th century balloon-frame and native limestone buildings have thick masonry walls that trap heat without interior or exterior insulation upgrades. On the outskirts, particularly along FM 78 and IH-10 toward San Antonio, 2000s-2020s production tract homes were built with minimum-code R-30 attic insulation, often compressed or poorly distributed by rapid-install crews. In the older west-side neighborhoods near Diversion Lake, pier-and-beam construction with open crawl spaces is common - an overlooked gap where uninsulated floor decks bleed conditioned air year-round and humidity accelerates wood deterioration.
Contractors who understand both retrofit challenges for historic stock and upgrade paths for code-minimum new construction have a real advantage here. We work on both.
Our Main Seguin Services
Most calls from Seguin homeowners start with one of these three services. Each has its own dedicated page with deeper detail.
Attic Insulation in Seguin
Attic insulation in Seguin means dealing with attics that were often an afterthought. In newer tract homes along the IH-10 corridor, we’ve found R-30 blown fiberglass compressed below its labeled thickness, sometimes with visible gaps near the eaves. In older homes near the square, attics may have original rock wool or nothing at all. We always start with a blower-door test to measure air leakage, then seal before we insulate. Attic Insulation in Seguin covers our full process, materials from Owens Corning and Knauf, and what documented results look like.
Spray Foam Insulation in Seguin
Spray foam makes particular sense in Seguin’s river-bottom humidity. Closed-cell spray foam acts as both insulation and vapor retarder, which matters in attics where fiberglass batts can absorb enough moisture to lose R-value. We’ve used it successfully in historic masonry retrofits where exterior insulation isn’t feasible, and in crawl spaces where vapor control is non-negotiable. Spray Foam Insulation in Seguin explains open-cell versus closed-cell, where each fits, and what before-and-after blower-door numbers look like on real jobs.
Blown-In Insulation in Seguin
Blown-in fiberglass or cellulose is the most common retrofit for Seguin’s production-built attics. The key difference in our work: we don’t blow over an unsealed attic floor. Top plates, can lights, and duct boots get sealed first - that’s Haven Standard practice, not an upgrade. We use materials from Johns Manville and GreenFiber, and we photograph the attic before and after so you see the distribution, not just the depth. Blown-In Insulation in Seguin has full pricing and process detail.
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
In Seguin’s west-side neighborhoods near Diversion Lake and the Guadalupe River, pier-and-beam homes with open crawl spaces are common - and commonly ignored. Uninsulated floor decks bleed conditioned air into the crawl year-round, while elevated humidity from the river bottom accelerates joist deterioration and invites mold. Crawl Space Encapsulation & Vapor Barrier is our primary service here because it solves both problems at once: thermal performance and moisture management.
Crawl Space Vapor Barrier
Signs you need it
Your floors feel cold in winter despite the heater running, or you notice a musty smell rising from floor registers during humid months.
What it costs in Seguin
A 6-mil to 20-mil vapor barrier installed over bare earth in a typical Seguin pier-and-beam crawl space runs $1,200-$2,800, with thicker mil ratings and larger footprints pushing toward the upper end.
How we do it
We remove debris, grade the earth for drainage, seam-seal the barrier with waterproof tape, and mechanically fasten it to foundation walls so it stays put when the space is accessed later.
Crawl Space Encapsulation
Signs you need it
You’re seeing condensation on ductwork, warping hardwood floors, or pest activity concentrated in the crawl space during Seguin’s wet spring months.
What it costs in Seguin
Full encapsulation with closed-cell spray foam on foundation walls, a sealed vapor barrier, and mechanical dehumidification for a typical Seguin home runs $4,500-$8,500, with larger perimeter foundations and active water management adding cost.
How we do it
We seal all vents, apply closed-cell foam to walls, install the vapor barrier with sealed seams, add a condensate-pumped dehumidifier, and deliver before-and-after humidity readings along with your photo record.
What Crawl Space Encapsulation & Vapor Barrier Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Vapor barrier (6-20 mil, earth coverage only) | $1,200 - $2,800 |
| Partial encapsulation (walls + barrier, no dehumidifier) | $3,200 - $5,500 |
| Full encapsulation with dehumidification | $4,500 - $8,500 |
Should I encapsulate my crawl space or just install a vapor barrier?
Start with a vapor barrier if your only issue is damp earth and occasional mustiness; upgrade to full encapsulation if you’re seeing condensation on ducts, floor warping, or pest intrusion. We assess both and give you a written price for each option.
How long does crawl space encapsulation take in Seguin?
Most vapor barrier jobs finish in one day; full encapsulation with dehumidification typically takes two to three days, depending on access and whether we need to address standing water first.
Radiant Barrier Installation in Seguin
Seguin’s hot-humid climate means attic temperatures regularly exceed 140°F in summer, and that radiant heat transfers directly into conditioned space through the ceiling. In the uninsulated or under-insulated attics common in both historic downtown homes and code-minimum tract construction, a radiant barrier can reduce ceiling heat gain by 20-35% - a meaningful load reduction on your AC system. Radiant Barrier Installation works best when paired with adequate attic insulation and proper ventilation, which we verify before installation.
Attic Radiant Barrier
Signs you need it
Your AC runs continuously on summer afternoons, upstairs rooms stay hot despite good insulation depth, or your ductwork in the attic feels hot to the touch.
What it costs in Seguin
Radiant barrier foil stapled to attic rafters in a typical Seguin home runs $1,800-$3,200, with complex rooflines and walkable attic space reducing labor time and cost.
How we do it
We install perforated foil across rafter bays, leaving ventilation channels intact, and verify with an infrared thermometer that surface temperatures drop before we leave.
Radiant Barrier & Ventilation
Signs you need it
Your attic has existing radiant barrier but still overheats, or soffit vents are blocked by insulation and ridge vents are insufficient for the roof volume.
What it costs in Seguin
Radiant barrier plus ventilation correction - adding baffles, clearing soffits, or supplementing ridge flow - typically runs $2,400-$4,200 in Seguin attics.
How we do it
We map existing airflow, install baffles to keep soffit paths clear, then apply radiant barrier with deliberate gaps for convection, documenting the improvement with thermal imaging.
What Radiant Barrier Installation Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Radiant barrier foil (rafter-mounted) | $1,800 - $3,200 |
| Radiant barrier with ventilation correction | $2,400 - $4,200 |
| Radiant barrier roof deck (new construction or reroof) | $2,800 - $4,800 |
Does radiant barrier work with existing attic insulation?
Yes, it’s designed to complement insulation, not replace it - the barrier reflects radiant heat, while insulation slows conductive heat flow through the ceiling assembly.
Will radiant barrier help my upstairs rooms in Seguin summers?
It reduces the heat source at the ceiling, which is often why upstairs rooms overheat; we’ve measured 15-25°F attic air temperature drops after proper installation in Seguin homes.
Insulation Removal & Replacement in Seguin
Seguin’s humidity and split housing stock create two distinct removal scenarios: in older homes near the river, we find water-damaged fiberglass or compressed cellulose that has lost R-value; in newer tract homes, we encounter poorly installed blown fiberglass with gaps and thin spots from fast production schedules. Insulation Removal & Replacement always includes air sealing before new material goes in - we won’t repeat the original installation’s shortcut.
Contaminated Insulation Removal
Signs you need it
You smell mustiness from attic vents, see visible mold on insulation surfaces, or had a roof leak that soaked the attic floor before it was repaired.
What it costs in Seguin
Removal and disposal of contaminated insulation in a typical Seguin attic runs $2,200-$4,500, with mold remediation and substrate treatment adding $800-$2,000 if needed.
How we do it
We use HEPA-filtered vacuums and negative air machines, bag the material on-site, treat exposed decking with antimicrobial if indicated, and deliver photos of clean substrate before new insulation is specified.
Insulation Replacement
Signs you need it
Your attic insulation is below current code depth, has settled unevenly, or was installed before 1990 and may contain vermiculite or formaldehyde binders.
What it costs in Seguin
Full removal of old material plus new blown fiberglass or cellulose installation in a typical Seguin attic runs $3,500-$6,800, with spray foam replacement ranging $5,500-$10,000.
How we do it
We remove to clean substrate, seal all top plates and penetrations with foam and caulk, then install new material to specified depth with uniform distribution verified by photo.
What Insulation Removal & Replacement Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Contaminated insulation removal only | $2,200 - $4,500 |
| Removal + blown fiberglass or cellulose replacement | $3,500 - $6,800 |
| Removal + spray foam replacement | $5,500 - $10,000 |
Do I have to leave during insulation removal?
No, but we seal the attic access and run negative air machines during removal; most homeowners stay downstairs with normal HVAC operation paused for the day.
How do I know if my old insulation is dangerous?
Vermiculite insulation installed before 1990 may contain asbestos - we test a sample before disturbing it, and if positive, we bring in certified abatement partners with documented chain of custody.
Attic Air Sealing in Seguin
Every attic we enter in Seguin leaks air - the question is how much. In historic balloon-frame homes near the square, top plates and balloon framing cavities create continuous pathways to exterior walls. In production-built tract homes, can lights, duct boots, and attic hatches were sealed with minimal effort or none. Attic Air Sealing is always our first step before adding insulation; we publish before-and-after blower-door numbers so you see the actual reduction in conditioned air loss.
Top Plate & Penetration Sealing
Signs you need it
Your blower-door test shows excessive air leakage, you feel drafts at ceiling outlets in winter, or dust streaks appear around ceiling fixture edges.
What it costs in Seguin
Sealing top plates, wire penetrations, plumbing stacks, and framing gaps in a typical Seguin attic runs $1,400-$2,800, with balloon-frame construction requiring more extensive cavity work.
How we do it
We use expanding foam for large gaps, acoustical sealant for smaller penetrations, and rigid foam with sealant for oversized holes, then re-test with the blower door to verify reduction.
Can Light & Duct Boot Sealing
Signs you need it
You see conditioned air leaking around recessed can lights in winter, or your duct boots - the metal connections between flex duct and ceiling registers - show dust accumulation from attic air infiltration.
What it costs in Seguin
Sealing can lights with rated covers and mastic-sealing duct boots in a typical Seguin home runs $800-$1,800, with more fixtures or complex duct layouts adding labor.
How we do it
We install fire-rated airtight covers over IC and non-IC cans, seal duct boots with mastic and mesh, and pressure-test the duct system if indicated to find additional leakage points.
What Attic Air Sealing Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Top plate and penetration sealing | $1,400 - $2,800 |
| Can light and duct boot sealing | $800 - $1,800 |
| Comprehensive attic air sealing (full package) | $2,200 - $4,200 |
Can air sealing alone lower my energy bills?
Yes, typically 10-20% in Seguin’s climate, because you’re no longer paying to condition air that escapes directly to the attic; the blower-door test quantifies exactly how much.
How do you prove air sealing worked?
We provide before-and-after CFM50 readings - the blower-door number showing cubic feet per minute of air leakage at 50 pascals of pressure - so you see the numeric improvement, not just a claim.
Wall Insulation in Seguin
Seguin’s historic masonry homes near the courthouse square have thick limestone walls that store heat all day and release it inward at night, while balloon-frame homes in the same area often have empty wall cavities with no insulation at all. On the outskirts, production-built homes may have minimal fiberglass batts with compression gaps at electrical boxes and plumbing stacks. Wall Insulation in Seguin requires different approaches for each construction type - we don’t apply a single method to every wall.
Injection Foam Wall Insulation
Signs you need it
Your exterior walls feel hot to the touch in summer, you have no insulation in stud cavities, or your home was built before 1950 with empty balloon-framed walls.
What it costs in Seguin
Injection foam insulation for a typical 1,800-square-foot Seguin home with accessible stud cavities runs $3,500-$6,500, with multi-story balloon-frame construction requiring more access points.
How we do it
We drill 5/8-inch holes at stud spacing, inject slow-rise foam under controlled pressure, patch with matching siding or interior texture, and verify fill with thermal imaging from the interior.
Drill & Fill Wall Insulation
Signs you need it
Your walls have some insulation but it’s settled, compressed, or incomplete - common in Seguin’s 1960s-1980s ranch homes with fiberglass batts that have slumped over time.
What it costs in Seguin
Drill-and-fill with dense-pack cellulose for a typical Seguin home runs $2,800-$5,200, with stucco or brick exteriors requiring more specialized patching than wood or vinyl siding.
How we do it
We remove a small section of siding or drill through mortar joints, blow cellulose to 3.5 pounds per cubic foot density for no-settle performance, patch access points, and provide thermal images showing complete cavity fill.
What Wall Insulation Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Injection foam (open stud cavities) | $3,500 - $6,500 |
| Drill-and-fill dense-pack cellulose | $2,800 - $5,200 |
| Exterior rigid foam retrofit (limited access) | $6,500 - $12,000 |
Can you insulate historic limestone walls in Seguin?
Interior rigid foam with a vapor-smart assembly is usually the best approach - we avoid trapping moisture in historic masonry, which can spall and deteriorate with freeze-thaw cycling.
Will wall insulation help with street noise?
Dense-pack cellulose and injection foam both reduce airborne sound transmission; we’ve measured 8-12 decibel reductions on busy streets like Court Street and King Street downtown.
Attic Cleaning & Rodent Proofing in Seguin
Seguin’s mature tree canopy and river-adjacent neighborhoods create ideal rodent habitat, and attics in both historic and newer homes provide access through gaps in soffits, roof returns, and uncapped vents. Once inside, rodents compress insulation, contaminate it with urine and feces, and create fire hazards by gnawing wiring. Attic Cleaning & Rodent Proofing addresses the full problem - removal, sanitization, exclusion, and restoration - not just trapping.
Attic Sanitizing & Decontamination
Signs you need it
You smell ammonia from the attic, see droppings on insulation surfaces, or had a rodent infestation that was trapped out but left contaminated material behind.
What it costs in Seguin
Removal of contaminated insulation, HEPA vacuuming of decking, and enzymatic sanitization in a typical Seguin attic runs $2,500-$4,800, with heavy contamination requiring substrate sealing before new insulation.
How we do it
We remove all contaminated material, vacuum with HEPA filtration, apply enzymatic cleaner to break down organic residue, and photograph clean substrate before specifying replacement insulation.
Rodent Proofing & Exclusion
Signs you need it
You hear scratching in walls or ceiling at night, find gnawed fascia or soffit edges, or have had recurring trapping despite pest control visits.
What it costs in Seguin
Comprehensive rodent exclusion with metal flashing, hardware cloth, and sealant for a typical Seguin home runs $1,800-$3,500, with steep roofs and complex eave details adding labor.
How we do it
We inspect every potential entry from foundation to ridge, seal with rodent-proof materials (not foam alone - they chew through it), install vent covers, and provide a written one-year exclusion warranty.
What Attic Cleaning & Rodent Proofing Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Attic sanitizing and decontamination | $2,500 - $4,800 |
| Rodent proofing and exclusion | $1,800 - $3,500 |
| Full attic restoration (cleaning + exclusion + insulation) | $5,500 - $9,500 |
How do I know rodents are gone before you reinsulate?
We require a two-week trap-clear period with no new activity, verified by you and us, before installing new insulation - reinsulating over active infestation wastes your money.
Does homeowners insurance cover rodent-damaged insulation?
Most policies exclude rodent damage as gradual and preventable, but we document everything with photos and written scope in case your adjuster makes an exception - we’ve had success with that documentation.
Home Energy Audit in Seguin
A home energy audit in Seguin reveals why your house performs the way it does - not just what insulation is present, but where air leaks, how ducts perform, and whether moisture is compromising thermal value. In historic homes with balloon framing, the audit often finds hidden pathways that bypass visible insulation entirely; in newer tract homes, we frequently identify builder shortcuts like unsealed attic hatches and compressed blown fiberglass. Home Energy Audit gives you a prioritized scope with written pricing for each measure, not a vague recommendation list.
Blower Door Test
Signs you need it
Your energy bills are higher than similar homes, you feel drafts you can’t locate, or you’re considering insulation work and want to know where air leakage actually occurs.
What it costs in Seguin
A standalone blower-door test with thermal imaging walkthrough in Seguin runs $350-$550; when bundled with a full audit, it’s typically included in the package price.
How we do it
We install a calibrated fan in an exterior door, depressurize the house to 50 pascals, and use smoke pencils and thermal cameras to map every leakage pathway while the house is under test.
Thermal Imaging Inspection
Signs you need it
You have uneven temperatures between rooms, suspect missing insulation in walls or vaulted ceilings, or want to verify that existing insulation was installed completely without gaps.
What it costs in Seguin
Thermal imaging as part of a full audit runs $450-$750; standalone inspection for a specific concern like a suspected roof leak or insulation void is $300-$450.
How we do it
We scan every surface with a calibrated FLIR camera, noting delta-T patterns that indicate missing insulation, air leakage, or moisture intrusion, and mark findings directly on photos in your report.
What Home Energy Audit Costs in Seguin
| Item | Typical range in Seguin |
|---|---|
| Blower-door test with thermal imaging | $350 - $550 |
| Full home energy audit (blower door, thermal, duct test, report) | $450 - $750 |
| Standalone thermal imaging inspection | $300 - $450 |
What does a home energy audit report include?
You get written blower-door CFM50 and ACH50 numbers, thermal images with annotations, a prioritized scope of recommended work with individual pricing, and the documentation to compare quotes apples-to-apples.
Should I get an audit before insulating my attic?
Yes - without knowing your air leakage rate, you can’t size insulation improvements correctly; we’ve seen Seguin homes where air sealing alone delivered more comfort gain than adding insulation would have.
Brands We Service in Seguin
We source insulation materials from Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber - no proprietary lock-in, so we specify what’s right for your home’s condition and your budget. Most common products are stocked within two days through our San Antonio coordination office, and we confirm material availability before scheduling so your job doesn’t stall. See our brands for full specifications and warranty terms.
Pricing for Insulation in Seguin, TX
| Service | Typical range in Seguin |
|---|---|
| Crawl space vapor barrier | $1,200 - $2,800 |
| Full crawl space encapsulation | $4,500 - $8,500 |
| Radiant barrier foil installation | $1,800 - $3,200 |
| Insulation removal (contaminated) | $2,200 - $4,500 |
| Insulation removal + replacement | $3,500 - $6,800 |
| Attic air sealing (comprehensive) | $2,200 - $4,200 |
| Wall insulation (drill-and-fill) | $2,800 - $5,200 |
| Attic sanitizing and decontamination | $2,500 - $4,800 |
| Rodent proofing and exclusion | $1,800 - $3,500 |
| Home energy audit (full) | $450 - $750 |
Prices in Seguin push higher when we encounter active moisture intrusion requiring drainage work, balloon-frame construction with extensive cavity access needs, or historic masonry requiring vapor-smart assemblies. Every job still begins with a written price before any work starts - Haven Standard Clause 1 - and ends with a Documented Photo Record.
Neighborhoods We Serve in Seguin
Our crews work throughout Seguin and surrounding Guadalupe County, from the historic downtown core to new development along the San Antonio commute corridors. Most Seguin appointments are scheduled within 48 hours of your call.
- Historic Downtown / Courthouse Square area
- West-side neighborhoods near Diversion Lake
- FM 78 corridor subdivisions
- IH-10 corridor production homes
- Guadalupe River bottom properties
Service Area - Cities Near Seguin
We serve Seguin directly and coordinate dispatch from our San Antonio office for surrounding communities. Homeowners in New Braunfels, TX, Cibolo, TX, Schertz, TX, and Universal City, TX can schedule the same services with the same written-price guarantee and documented results.
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
Most attic insulation and air sealing doesn’t require a permit in Seguin, but crawl space encapsulation with structural modifications or electrical work for dehumidifiers may - we pull permits when required and include the cost in your written price.
We answer calls with a live person 24/7, and most Seguin homeowners get an appointment within 48 hours; emergency situations like water-damaged insulation or active rodent infestation get same-day assessment when possible.
Yes - we regularly retrofit balloon-frame and limestone construction in Seguin’s historic district, using vapor-smart assemblies and reversible methods that don’t damage original fabric, with written scopes tailored to each building’s condition.
Ready to see what your home actually needs? Call (830) 243-6352 for a free estimate. We’ll give you a written price before any work starts, documented photos when we’re done, and before-and-after blower-door numbers on every applicable job.
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
"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."The winter gas bill dropped by about a third. They had estimated a quarter, so they under-promised."
- Genevieve R."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.