Trusted Attic Air Sealing for Schertz Homeowners
Wondering how much Attic Air Sealing costs? In Schertz it typically runs $1,200-$3,400 for a complete job, and most homes we seal show a 30-50% reduction in air leakage on the blower-door test - the pressurization reading that tells you, in one number, how much conditioned air your envelope is losing. We complete most attic air sealing projects in a single day, and we’ve been doing this work under The Haven Standard since 2016, with every job starting from a written price and ending with a documented photo record.
Schertz sits in the I-35 corridor where summer attic temperatures regularly hit 140°F and winter cold snaps drop below freezing. That temperature swing forces conditioned air through every crack and penetration in your attic floor if they haven’t been sealed. We’ve sealed and insulated over 9,000 homes since 2016, and the pattern we see in Schertz neighborhoods like The Crossvine, Willow Grove, and Pecan Grove is consistent: builders installed adequate insulation, but they skipped the air sealing. Insulation slows heat transfer; it does not stop air movement. When air leaks through fiberglass or cellulose, that insulation’s rated performance drops by half or more. We specialize in Attic Air Sealing in Schertz, and we don’t blow insulation over an unsealed attic floor. Ever. Call (830) 402-5240 - a live person answers 24/7.
What Our Attic Air Sealing Service Includes
Attic Floor Air Sealing
The attic floor is where your conditioned living space meets the unconditioned attic, and it’s where most air leakage happens in Schertz homes. We seal the seams between drywall and top plates, around plumbing and electrical penetrations, and at any gaps in the framing - using expanding foam, caulk, and rigid air barriers depending on the gap size and location. Most Schertz homes built between 2000 and 2020 have attic floors that leak 2,000-4,000 CFM50 before we start; after sealing, we typically see that number cut by a third or more. We verify this with a blower-door test - a pressurization reading that shows, in one number, how much air your building envelope is losing - and we give you the before-and-after numbers in writing.
Top Plate & Penetration Sealing
Top plates are the horizontal framing members where interior walls meet the ceiling, and they’re rarely sealed in production-built Schertz homes. Every electrical wire, plumbing vent, and HVAC chase that passes through that plate creates a direct pathway for conditioned air to escape into the attic. We pull back insulation systematically, seal each penetration with appropriate materials - fire-rated foam where code requires it, acoustic sealant for smaller gaps - and photograph every location before we cover it back up. In neighborhoods like Schertz’s Westwood Village, we’ve found homes with dozens of unsealed top-plate gaps, each one a small chimney moving air the wrong direction. You get those photos in your Documented Photo Record, included on every job, not available on request.
Can Light & Duct Boot Sealing
Recessed can lights are among the worst offenders for attic air leakage, especially the non-IC-rated fixtures common in Schertz homes built before 2012. These fixtures aren’t designed for contact with insulation, so builders often leave gaps around them that leak conditioned air year-round. We install pre-formed airtight covers or replace them with IC-rated airtight housings, depending on the fixture type and your preference. Duct boots - the metal transitions where flex duct connects to ceiling registers - are another chronic leak point; the connection between boot and drywall is rarely sealed, and in Schertz’s cooling-dominated climate, that means you’re paying to air-condition your attic every time the AC runs. We seal every boot with mastic and mesh tape, materials that outlast the duct tape you’ll find on older jobs.
Attic Hatch Sealing
The attic hatch is a door-sized hole in your thermal envelope, and in most Schertz homes it’s completely unsealed - just a piece of drywall or plywood resting on trim molding. We build insulated, weatherstripped hatch covers with proper latches that maintain a positive seal, or we upgrade to a pre-engineered attic access door if the opening location allows. The difference shows up immediately on the blower-door test: a typical unsealed attic hatch in a Schertz home leaks 150-400 CFM50 on its own. After our seal, that drops to near zero. Under Haven Standard: Have it in writing, you get the blower-door numbers that prove it.
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.
Brands We Service for Attic Air Sealing
We work with Owens Corning air-sealing accessories and rigid foam board on a regular basis - their Foamular NGX line is what we specify for larger attic floor gaps where expanding foam would be impractical or where fire-rated assemblies are required. We’ve also installed Icynene open-cell spray foam for air-sealing applications where a seamless monolithic barrier makes sense, particularly in complex Schertz attic layouts with multiple levels or vaulted sections. Our materials come from Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber - no proprietary product lock-in, so we specify what fits your home rather than what a manufacturer requires us to sell.
Demilec’s Heatlok HFO spray foam is another product we’ve used for air-sealing in Schertz homes where low global-warming-potential formulations matter to the homeowner, or where we need the higher R-value per inch that closed-cell provides in tight spaces. Whether your home has existing Owens Corning insulation that needs to be temporarily moved for sealing access, or you’re starting fresh with a GreenFiber cellulose plan after we complete the air sealing, we can help. We don’t push brands; we document what we used and why in your written scope.
Signs You Need Attic Air Sealing Right Now
- Your upstairs rooms are 5-10 degrees hotter than downstairs in summer. This isn’t normal in a properly sealed home. In Schertz, where attic temperatures peak in July and August, unsealed attic floors allow superheated air to radiate downward and conditioned air to escape upward. The temperature split you’re feeling is your HVAC system losing the battle against air leakage.
- Your energy bills spike every July and August despite “good” insulation. We’ve heard this from homeowners in Schertz’s Copper Ridge and Belmont Park subdivisions - they have R-38 in the attic, but their summer electric bills hit $400-$500. The insulation is doing its limited job; the air leaks are undoing it. A blower-door test reveals the real problem in about 90 minutes.
- You feel drafts from ceiling fixtures, outlets, or baseboards on exterior walls. Those drafts aren’t coming through the walls in most cases; they’re coming down from the attic through framing cavities that connect to your top plates. In Schertz’s older neighborhoods like Schertz Parkway, this pattern is especially common in homes built before modern air-sealing codes.
- Your HVAC runs constantly but never reaches set temperature. When conditioned air leaks into the attic as fast as your system produces it, the thermostat never satisfies. Your equipment works harder, wears faster, and still can’t keep up. We’ve seen Schertz homeowners replace perfectly good HVAC systems before discovering the real issue was attic air leakage.
- You’ve had ice dams, even in Schertz’s mild winters. Rare but real: when attic air leaks warm the roof deck unevenly, melting snow refreezes at the eaves. The 2021 freeze proved that Schertz isn’t immune to winter damage. Air sealing prevents the warm-air migration that causes this, protecting your roof structure and interior finishes.
Our Attic Air Sealing Process - Step by Step
- 1
Written price before any work starts. We inspect your attic, run a blower-door test if you choose (recommended), and deliver a flat price with a written scope and written warranty before anyone lifts a tool. This is Haven Standard Clause 1, non-negotiable. You’ll know exactly what we’re sealing, what materials we’re using, and what the documented result will look like.
- 2
Pre-work blower-door test and photo documentation. On applicable jobs, we pressurize your home to 50 Pascals - the standard pressure differential for envelope testing - and record the CFM50 reading. We photograph every leak location we can access: top plates, penetrations, can lights, duct boots, the attic hatch. These become your “before” record.
- 3
Systematic air sealing, zone by zone. We work from the attic hatch outward, pulling back insulation only where needed, sealing each leak category with the right material for the job. Fire-rated expanding foam for large penetrations near combustion appliances. Acoustic sealant for wire and pipe gaps. Rigid foam and mastic for duct boots. Every sealed location is photographed before it’s covered.
- 4
Post-work blower-door test and verification. After sealing is complete, we run the blower-door test again and compare. Most Schertz homes show a 30-50% reduction in CFM50; some tighter homes achieve more, some leakier homes less. The number is what it is, and we give it to you in writing - no rounding up, no selective reporting.
- 5
Documented Photo Record delivery and written warranty. Before we leave, you receive your complete documentation: before-and-after blower-door numbers, photos of sealed locations, materials used, and your 365-Day Done Right Promise in writing. If it’s not done right, we make it right. That’s the Haven Standard we’ve operated under since 2016.
How Much Does Attic Air Sealing Cost in Schertz?
A typical attic air sealing job in Schertz runs $1,200-$3,400 depending on attic size, accessibility, and the number of penetrations we need to seal. Here’s how that breaks down for common scenarios we see:
- Small attic (under 1,000 sq ft), limited penetrations: $1,200-$1,800. Common in older Schertz homes near Main Street and FM 3009.
- Mid-size attic (1,000-2,000 sq ft), standard penetrations: $1,800-$2,600. Typical for homes in The Crossvine, Willow Grove, and similar subdivisions built 2005-2015.
- Large or complex attic (2,000+ sq ft), multiple levels, many penetrations, or can-light replacement: $2,600-$3,400. Often seen in newer Schertz construction with bonus rooms, tray ceilings, or extensive recessed lighting.
What moves the price: attic accessibility (steep roof pitch or limited hatch size adds labor), the condition of existing insulation (wet, compressed, or rodent-contaminated insulation must be removed before sealing), and whether can lights need IC-rated airtight housings versus simple covers. What’s included in our written price: all materials, labor, the blower-door test, your Documented Photo Record, and the 365-Day Done Right Promise. What’s not included: insulation replacement or addition, which we quote separately and only recommend after sealing is complete. We also offer a Free Second Opinion on Any Written Estimate - bring us a competing quote and we’ll read it with you, line by line.
Call (830) 402-5240 for an exact quote - estimates are free, and no work starts without a written price.
Attic Air Sealing Near Schertz - Our Service Area
We serve Schertz and the full I-35 northeast corridor, including Attic Air Sealing in Cibolo, Attic Air Sealing in Universal City, Selma, Converse, Live Oak, Windcrest, Kirby, New Braunfels, Terrell Hills, Alamo Heights, and Castle Hills. Response time to Schertz proper is typically same-day or next-day for estimates; most sealing jobs are scheduled within a week of written approval. We know the local building stock - from Schertz’s 1980s ranch homes to the new construction in Westwood Village - and we know which subdivisions were built before 2012 IRC air-sealing requirements took effect.
Serving Schertz, TX - Our Local Coverage Area
We’re based in the Schertz area and know this community well - we also provide Attic Air Sealing - Universal City. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions - Attic Air Sealing in Schertz
Attic air sealing is the process of closing gaps, cracks, and penetrations in your attic floor and thermal envelope to stop conditioned air from escaping into the attic and unconditioned air from entering your living space. Insulation slows heat transfer through solid materials; air sealing stops air movement entirely. In Schertz’s climate, you need both - but sealing must come first, because air moving through insulation destroys its rated performance.
Most complete attic air sealing jobs in Schertz take one full day, with larger or more complex attics occasionally requiring a second day. The blower-door testing and photo documentation add about 90 minutes to each end of the job. We schedule arrival between 8 and 9 AM, and most homeowners have their documented results by 4 or 5 PM the same day.
Attic air sealing in Schertz typically costs $1,200-$3,400 depending on attic size, accessibility, and the number of penetrations. A written price with flat scope and warranty is delivered before any work starts - that’s Haven Standard Clause 1. Call (830) 402-5240 for an exact quote - estimates are free.
Yes. We regularly work in Schertz homes with existing Owens Corning fiberglass, Icynene spray foam, or other installed insulation systems. Our air sealing is compatible with all common insulation types; in fact, we often temporarily move existing insulation to access leak points, then replace it properly after sealing is verified. We do not require you to use any specific brand for the sealing work itself.
We answer calls 24/7 with a live person, and we maintain same-day and next-day availability for Schertz estimates. True emergencies from attic air leakage - like visible ice damming in winter freeze events or sudden HVAC failure traced to attic duct collapse - get priority scheduling. For standard air sealing, we typically book within a week of your written approval.
Every attic air sealing job carries our 365-Day Done Right Promise - if it’s not done right, we make it right. The specific warranty terms are written and delivered before work starts, along with your scope and price. The Promise covers both materials and workmanship; if a sealed location fails within the warranty period, we return and repair at no charge.
Clear a path to your attic hatch and remove any stored items within 3 feet of the hatch opening. If you have pets, secure them in a separate room during the blower-door test - the fan noise and pressure change can disturb some animals. We bring everything else: drop cloths, lighting, materials, and documentation. You don’t need to be home for the entire job, but we do need interior access for the blower-door testing.
Schedule Your Attic Air Sealing Service in Schertz Today
Call (830) 402-5240 now - a live person answers 24/7, and we’ll schedule your free estimate with a written price before any work starts. Every job ends with a Documented Photo Record and, on applicable work, before-and-after blower-door numbers that prove what you paid for. We’ve sealed and insulated over 9,000 homes since 2016 under The Haven Standard, including Cibolo Attic Air Sealing, and we don’t blow insulation over an unsealed attic floor. Period.
Written by Wes Okafor, Owner at Topside Attic Insulation Schertz, serving Schertz since 2016.