Attic Insulation in Seguin - Same-Day Service, Done Right the First Time

Insulation in Seguin, TX

Crawl space encapsulation and vapor barrier installation in Seguin typically runs $2,800-$6,500 for a full encapsulation, with most river-valley homes needing moisture control that newer suburbs simply don’t face. We’re Envelope Insulation Co., and we don’t install insulation over an unsealed building envelope - period. If your Seguin home was built between the 1940s and 1970s, there’s a strong chance your crawl space has no vapor barrier at all, and the Guadalupe River valley humidity is doing damage you can’t see yet. Call (830) 549-6646 for a written price before any work starts.

Call (830) 549-6646

Why Seguin Homes Are Different

Seguin’s housing stock is dominated by post-WWII wood-frame and native limestone homes that predate Texas energy codes. Many were built with no wall insulation and minimal attic coverage, and the limestone construction common near the downtown square creates thermal mass and moisture-retention challenges that simple batt retrofits can’t solve alone.

The Guadalupe River valley traps humidity in ways that drier parts of Guadalupe County don’t experience. Summer temperatures push past 98°F, attic temperatures exceed 150°F in July and August, and vapor drive pushes moisture inward through poorly sealed envelopes. In lower-elevation neighborhoods near the river bottom, we’ve found older fiberglass batts from the 1980s and 1990s sagging off joists, compressed to half their effective R-value. That pattern doesn’t appear on the drier west side of the county, and it changes what we quote: encapsulated spray foam or dense-pack cellulose, not standard batts.

Our Main Seguin Services

These are the three services Seguin homeowners call about most often.

Attic Insulation in Seguin

Attic retrofits in Seguin are almost always remediation jobs, not new installs. We pull degraded material, seal the attic floor against the humidity driving inward from the valley, then install to the corrected R-value. Every attic job gets a blower-door test - a pressurization reading that shows, in one number, how much air the envelope was losing before and after. Attic Insulation in Seguin covers our full process.

Spray Foam Insulation in Seguin

Open-cell and closed-cell spray foam are both stocked for Seguin jobs, with closed-cell specified more often here because of the humidity load. We use it in crawl spaces, rim joists, and attic rafters where vapor control is as important as R-value. Spray Foam Insulation in Seguin has the details.

Blown-In Insulation in Seguin

Blown-in fiberglass and cellulose are our standard retrofit tools for attics in Seguin’s older neighborhoods. Cellulose gets specified more often near the river bottom because it handles incidental moisture better than fiberglass when the envelope isn’t perfectly tight yet. Blown-In Insulation in Seguin explains the trade-offs.

Before

After

Crawl Space Encapsulation & Vapor Barrier in Seguin

Most Seguin crawl spaces were built with dirt floors, no vapor barrier, and vents that admit humid valley air year-round. That combination rots rim joists, grows mold on floor sheathing, and drives up cooling loads as the house pulls damp air upward through gaps in the envelope. Crawl Space Encapsulation & Vapor Barrier is the service we pair with air sealing on nearly every Seguin job because the moisture problem won’t solve itself.

Crawl Space Vapor Barrier

Signs you need it

Your crawl space has a dirt floor or thin plastic sheeting, and the floor above feels cold or damp in summer despite the air conditioning running.

What it costs in Seguin

A 6-mil to 20-mil vapor barrier installed over a dirt crawl space floor in Seguin typically runs $1,200-$2,800 depending on square footage, pier count, and whether we need to grade the surface first.

How we do it

We remove debris, grade the floor for drainage, seam-seal a reinforced polyethylene barrier to the walls and piers, then seal all edges with mastic tape before inspecting with a smoke pencil.

Crawl Space Encapsulation

Signs you need it

You’re seeing mold on floor joists, noticing musty smells inside the home, or your hardwood floors are cupping from below.

What it costs in Seguin

Full encapsulation with closed-cell spray foam on rim joists, vapor barrier on walls and floor, and a dehumidifier in Seguin generally ranges from $4,500-$8,500 for homes under 2,500 square feet.

How we do it

We seal vents, apply closed-cell foam to rim joists and walls, install the floor vapor barrier, add a condensate-pumped dehumidifier, and deliver before-and-after moisture readings with the photo record.

What Crawl Space Encapsulation & Vapor Barrier Costs in Seguin

How long does crawl space encapsulation take in Seguin?

Most Seguin encapsulations finish in two to three days. Limestone foundation homes near downtown may need an extra day for irregular wall surfaces. We text arrival times and deliver a written scope before anyone starts.

Will encapsulation stop my floors from feeling cold?

Yes, if the cold is coming from below. We measure floor surface temperature before and after, and the 365-Day Done Right Promise covers any performance shortfall. Call (830) 549-6646 for a free estimate.

Radiant Barrier Installation in Seguin

Seguin attics hit 150°F regularly in summer, and that radiant heat transfers straight through roof sheathing into conditioned space. Homes built before energy codes - most of Seguin’s stock - have no radiant barrier at all, which means the insulation itself is fighting a battle it can’t win against infrared transfer. Radiant Barrier Installation is our standard add to attic jobs where the roof deck is accessible.

Attic Radiant Barrier

Signs you need it

Your upstairs rooms stay hot past 10 p.m., your AC runs continuously on summer afternoons, or your ductwork in the attic feels hot to the touch.

What it costs in Seguin

Attic radiant barrier installation in Seguin typically runs $1,400-$2,600 for a standard gable roof under 2,500 square feet, with complex rooflines or steep pitches adding labor.

How we do it

We staple perforated foil across rafter bottoms or lay it over existing insulation, depending on access, then verify with an infrared thermometer reading of the attic floor before we leave.

Radiant Barrier Roof Deck

Signs you need it

You’re re-roofing or have open rafters, and you want the barrier attached directly to the roof deck for maximum reflectivity.

What it costs in Seguin

Roof-deck radiant barrier applied during a re-roof or in an open attic in Seguin generally costs $2,200-$3,800, including the foil and labor but not roofing materials.

How we do it

We apply foil-faced sheathing or liquid radiant barrier coating to the deck, seal seams, and document the install with photos showing coverage percentage.

What Radiant Barrier Installation Costs in Seguin

Does radiant barrier work with existing insulation?

Yes, it’s designed to complement it. The barrier blocks radiant heat before it reaches the insulation, so the R-value performs as rated instead of being overwhelmed. We never install barrier over unsealed attics.

Can you install radiant barrier in summer?

We schedule early mornings and use temporary ventilation; most Seguin attic jobs finish before noon. Call (830) 549-6646 to book a slot - estimates are free.

Insulation Removal & Replacement in Seguin

Seguins river-valley humidity ruins insulation from below while attic heat degrades it from above. We’ve pulled saturated batts near the Guadalupe that weighed three times their dry weight, and found rodent-compacted cellulose in 1960s ranch homes that tested at R-11 despite being sold as R-30. Insulation Removal & Replacement starts with testing what’s there, not assuming.

Contaminated Insulation Removal

Signs you need it

Your attic smells musty or like urine, you see droppings or nesting material, or your insulation has visible water staining or mold.

What it costs in Seguin

Contaminated insulation removal and disposal in Seguin typically runs $1,800-$3,200 for an attic under 1,500 square feet, with HEPA containment and bagging required by disposal regulations.

How we do it

We set up negative-air containment, remove material with sealed vacuums, bag on-site, then inspect sheathing for damage before any new insulation goes in.

Insulation Replacement

Signs you need it

Your insulation is compressed, sagging below joist tops, or was installed before 1990 and has never been evaluated.

What it costs in Seguin

Full removal and replacement with new blown-in or batt insulation in Seguin generally ranges from $2,400-$4,800 depending on target R-value and access.

How we do it

We remove old material, seal the attic floor, install baffles at eaves, then blow or place new insulation to the specified depth with depth markers every 100 square feet.

What Insulation Removal & Replacement Costs in Seguin

Do I have to leave during insulation removal?

No, but we seal the work zone and run HEPA filtration. Most Seguin homeowners stay in place. We notify you before powering equipment on and off.

How do I know if my old insulation has asbestos?

Vermiculite installed before 1990 may contain asbestos; we test first and hold work until lab results return. Never disturb it yourself. Call (830) 549-6646 and we’ll handle the testing.

Attic Air Sealing in Seguin

Air sealing is the hard prerequisite we won’t skip. In Seguins older homes, top plates, can lights, and duct boots leak conditioned air into the attic continuously, and that warm, moist air hits the cold sheathing in winter or the 150°F deck in summer. Attic Air Sealing is always step one before we add insulation, because new R-value over a leaky floor is wasted money.

Top Plate & Penetration Sealing

Signs you need it

You feel drafts from outlets on exterior walls, see dusty insulation around wiring holes, or your blower-door test shows excessive leakage at the ceiling plane.

What it costs in Seguin

Top plate and penetration sealing in a typical Seguin attic runs $1,200-$2,400, with two-story homes and complex framing adding time for access.

How we do it

We foam-seal every top plate joint, wire penetration, and pipe chase with two-part closed-cell foam, then verify with a blower-door test showing the reduction in CFM50.

Can Light & Duct Boot Sealing

Signs you need it

Your can lights flicker in wind, you see insulation debris around duct boots, or rooms farthest from the air handler never reach set temperature.

What it costs in Seguin

Sealing can lights with rated covers and mastic-sealing duct boots in Seguin typically costs $800-$1,800 depending on fixture count and duct configuration.

How we do it

We install fire-rated airtight covers over IC and non-IC cans, seal duct boots with mastic and mesh, then pressure-test the duct system if requested.

What Attic Air Sealing Costs in Seguin

Can air sealing alone lower my bills?

Yes, typically 10-20% in Seguins older stock. The blower-door number proves it - we hand you the before-and-after reading. Under Haven Standard: no work starts without a written price.

Do you seal attic hatches too?

Every hatch gets weatherstripping and insulation backing if it’s not already treated. It’s the most common single leak we find. Call (830) 549-6646 for an estimate.

Wall Insulation in Seguin

Seguins post-WWII homes often have empty wall cavities - no insulation at all - and limestone construction near downtown makes standard retrofit methods difficult. The humidity means any wall insulation we add must be paired with air sealing and vapor management, or we’re trapping moisture inside the cavity. Wall Insulation in Seguin is almost always a custom scope, not a standard package.

Drill & Fill Wall Insulation

Signs you need it

Your exterior walls are cold to the touch in winter, you have no outlet insulation when you remove cover plates, or your home was built before 1980 with no energy code compliance.

What it costs in Seguin

Drill-and-fill with dense-pack cellulose in Seguin typically runs $2,200-$4,500 for a 1,500-square-foot home, with stucco or limestone exteriors adding repair complexity.

How we do it

We drill 2-inch holes at stud bay intervals, dense-pack cellulose to 3.5 pounds per cubic foot for air resistance, then patch with matching material and texture.

Injection Foam Wall Insulation

Signs you need it

You want air sealing and insulation in one step, have irregular cavities from balloon framing, or previous batt installation left gaps at the top and bottom of studs.

What it costs in Seguin

Injection foam for exterior walls in Seguin generally costs $3,500-$6,500 for a similar footprint, with open-cell foam at the lower end and closed-cell at the upper.

How we do it

We inject slow-rise foam through ports in the sheathing or interior drywall, monitor fill with thermal imaging, and trim excess after cure before patching.

What Wall Insulation Costs in Seguin

Will drill-and-fill damage my siding?

We match the patch to your material - wood, Hardie, or stucco. On limestone homes near downtown, we often access from inside to preserve exterior character. We photograph every patch location.

Can you insulate walls without removing drywall?

Yes, that’s what drill-and-fill and injection foam are designed for. Minimal interior disruption, typically one day. Call (830) 549-6646 for a written scope and price.

Attic Cleaning & Rodent Proofing in Seguin

River-valley humidity and mature tree canopy make Seguin attics attractive to rodents, and once they’re in, they compress insulation, contaminate air handlers, and chew wiring. We’ve restored attics in the historic core where decades of nesting had reduced R-value to near zero. Attic Cleaning & Rodent Proofing includes exclusion - or they’ll be back next season.

Attic Sanitizing & Decontamination

Signs you need it

You smell ammonia or musk from vents, see droppings or urine staining on joists, or your family has experienced unexplained respiratory symptoms.

What it costs in Seguin

Attic sanitizing and decontamination in Seguin typically runs $1,400-$2,800, including enzyme treatment, HEPA vacuuming, and disposal of contaminated material.

How we do it

We remove contaminated insulation, apply enzymatic cleaner to break down organic material, HEPA-vacuum all surfaces, and deliver photos of clean sheathing before any new work.

Rodent Proofing & Exclusion

Signs you need it

You hear scratching at night, see gnaw marks on fascia or soffits, or have found entry points around plumbing vents or chimney flashing.

What it costs in Seguin

Rodent proofing with exclusion work on a typical Seguin home runs $900-$2,200, with steep roofs or multiple entry points adding ladder time and material.

How we do it

We inspect with a camera, seal every entry larger than 1/4 inch with rodent-proof mesh or metal flashing, install vent guards, and warranty the exclusion for one year.

What Attic Cleaning & Rodent Proofing Costs in Seguin

How do I know rodents are gone before you re-insulate?

We set monitoring devices, seal all entries, and wait 72 hours with no activity before installing new insulation. The 365-Day Done Right Promise covers re-entry.

Is rodent damage covered by homeowners insurance?

Sometimes, for sudden damage, but not for gradual infestation. We document everything with photos for your adjuster. Call (830) 549-6646 and we’ll review your policy language with you.

Home Energy Audit in Seguin

A home energy audit in Seguin reveals what you can’t see: where humid valley air is entering, where conditioned air is escaping, and whether your insulation is performing at its labeled R-value or has degraded in the river-valley climate. Home Energy Audit is the starting point for every retrofit we recommend, and the documentation becomes your baseline.

Blower Door Test

Signs you need it

Your energy bills are rising without rate increases, rooms have uneven temperatures, or you’re considering insulation work and want to prioritize the biggest leaks.

What it costs in Seguin

A standalone blower-door test in Seguin typically runs $350-$550, or it’s included at no charge when bundled with a full audit or insulation proposal.

How we do it

We install a calibrated fan in an exterior door, depressurize the house to 50 Pascals, and measure CFM50 - the cubic feet per minute of air leakage at standard pressure.

Thermal Imaging Inspection

Signs you need it

You suspect missing insulation in walls, want to verify recent work, or have rooms that never feel comfortable despite the HVAC running normally.

What it costs in Seguin

Thermal imaging as part of a full audit in Seguin generally costs $450-$750, or $250-$400 as an add-on to an existing blower-door test.

How we do it

We scan with a FLIR camera during the blower-door test to exaggerate temperature differences, mark anomalies on floor plans, and deliver images with R-value estimates for each wall section.

What Home Energy Audit Costs in Seguin

How long does a home energy audit take?

Plan on three to four hours for a full audit in Seguin. We need access to attic, crawl space, and all rooms. You receive the blower-door number, thermal images, and a written priority list same day.

Will the audit tell me what to fix first?

Yes, ranked by cost-effectiveness and your comfort complaints. Air sealing is almost always first in Seguins older stock. Call (830) 549-6646 to schedule - estimates are free.

Brands We Service in Seguin

We source materials from Owens Corning, Johns Manville, Knauf, and other major manufacturers - no proprietary lock-in, so we specify what’s right for your home, not what’s in our warehouse. Most common products are stocked within two days of the San Antonio office. See our brands for the full list.

Pricing for Insulation in Seguin, TX

Neighborhoods We Serve in Seguin

We work across Seguins full range, from the historic limestone blocks near the downtown square to the post-war ranch homes spreading toward the Guadalupe River. Most calls are answered live, and crews are typically on-site within 24-48 hours.

• Historic Downtown Seguin
• River Oaks and Guadalupe River bottom
• Weinert Street corridor
• McQueeney area
• Seguin suburbs along SH 123

Service Area - Cities Near Seguin

Dispatch and scheduling run from our San Antonio office, with crews serving Seguin locally and surrounding communities including New Braunfels, TX, Cibolo, TX, Schertz, TX, and Universal City, TX. The same crew, same written price, same documentation standard applies everywhere we travel.

FAQs About Insulation in Seguin