Trusted Spray Foam Insulation for Schertz Homeowners
Spray Foam Insulation in Schertz typically runs $1.80-$3.50 per board foot depending on open-cell or closed-cell selection, and most residential jobs are completed in a single day. At Topside Attic Insulation Schertz, we’ve sealed and insulated over 9,000 homes since 2016, and every project starts with a written price before any work begins. Call (830) 402-5240 for a free estimate with same-day scheduling available throughout Schertz, Cibolo, and Universal City.
Schertz sits in the Texas Hill Country transition zone where summer temperatures push past 100°F and winter nights can dip below freezing. That temperature swing forces HVAC systems to work overtime when conditioned air leaks through gaps in the building envelope. We’ve measured blower-door readings in Schertz homes built between 2015 and 2025 that show air leakage rates 40-60% above what the insulation alone should deliver. The gap is almost always unsealed top plates, can light penetrations, and rim joist gaps that fiberglass batts simply can’t close. Our approach treats air sealing as a hard prerequisite, not an upsell, and we publish before-and-after blower-door numbers on every applicable job so you can verify the performance change you paid for.
We’re independently owned and operated under The Haven Standard since 2016. Every crew is background-checked and uniformed, and a live person answers our phones 24/7. No voicemail loops. No callback windows measured in business days.
What Our Spray Foam Insulation Service Includes
Open-Cell Spray Foam
Open-cell spray foam is a low-density polyurethane that expands to roughly 100 times its liquid volume, creating a soft, flexible insulation barrier ideal for interior applications in Schertz’s climate. We use it primarily for attic floor insulation and wall cavities where the structure needs to breathe and moisture management matters more than structural rigidity. In Schertz homes with vented attics, open-cell delivers an R-value of approximately 3.5 per inch and forms an effective air barrier when installed to proper depth. We source open-cell products from Icynene and Demilec, and we never install it over an unsealed attic floor. Our crews complete air sealing of top plates, can lights, and penetrations first, then blow the foam. You get a written scope, a written warranty, and a Documented Photo Record showing both the sealed substrate and the finished foam application.
Closed-Cell Spray Foam
Closed-cell spray foam is a higher-density polyurethane that cures to a rigid, structural material with an R-value of approximately 6.5 per inch and a built-in vapor barrier at thicknesses above 1.5 inches. We specify closed-cell for Schertz applications where space is limited and maximum thermal performance per inch is critical: garage ceilings, metal building walls, and roof decks where the foam serves as both insulation and structural reinforcement. The rigidity adds racking strength to walls, which matters in Texas wind zones. Our crews have applied closed-cell foam from Owens Corning and Johns Manville in hundreds of Schertz-area homes, and we document the applied thickness with depth gauges at multiple points per cavity. The before-and-after blower-door test shows the air-leakage reduction in a single figure.
Rim Joist Spray Foam
The rim joist is the perimeter band where your foundation walls meet the first floor framing, and it’s one of the most overlooked leakage paths in Schertz homes. Fiberglass stuffed in this cavity does almost nothing because it can’t seal the irregular gaps between the sill plate, rim joist, and subfloor. We remove any existing insulation, clean the wood surfaces, and apply closed-cell spray foam to create a continuous air and thermal barrier. In Schertz’s clay-heavy soils, foundation settling often opens new gaps at the rim joist over time, so we inspect for active gaps and seal them before foaming. The blower-door test typically shows a 15-25% reduction in total air leakage from rim joist work alone. You receive photos of the sealed cavity before foam application and the finished result after.
Garage Ceiling Spray Foam
Garage ceilings in Schertz are usually unconditioned spaces with living space above, making them a major thermal bridge and air leakage path. We see this constantly in neighborhoods like The Crossvine and Belmont Park, where bonus rooms over garages run 8-12°F warmer than the rest of the house in summer. Our process starts with air sealing all penetrations, including the garage door header, electrical runs, and any duct boots passing through. Then we apply closed-cell spray foam to the garage ceiling at R-19 to R-30 equivalent thickness, depending on joist depth. The foam creates a continuous air barrier that stops the stack effect from pulling conditioned air down through the floor assembly. We document the work with photos and provide the blower-door reading if the garage is within the conditioned envelope test boundary.
Spray Foam Roof Deck
Spray foam applied directly to the underside of the roof deck converts a vented attic into a conditioned, semi-conditioned, or unvented attic, depending on your HVAC configuration. In Schertz, where radiant heat gain through dark shingles can push attic temperatures past 140°F, roof deck foam keeps the attic within 10-15°F of the living space below. We use open-cell foam for most roof deck applications in Schertz, applied at 5-7 inches to achieve R-19 to R-25 with full air barrier performance. The critical detail is sealing all vents and ensuring the HVAC system can handle the additional conditioned volume. We calculate the load impact and document the sealed vent locations with photos. Every roof deck job includes the before-and-after blower-door numbers so you can see the envelope performance change.
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 Spray Foam Insulation
We source spray foam materials from Icynene, Demilec, and Owens Corning, among other manufacturers, and we maintain current training and equipment for each product line. Icynene’s open-cell formulations are our most-specified product for Schertz attic floors; we’ve applied their classic MD-R-200 and newer low-GSP options in hundreds of local homes. Demilec’s heat-resistant closed-cell products perform well in garage ceiling and roof deck applications where summer attic temperatures stress lesser formulations. Owens Corning’s FOAMULAR rigid foam and spray foam systems integrate cleanly with their full building envelope product line when we’re specifying hybrid assemblies with fiberglass or mineral wool.
Whether your existing spray foam was installed by another contractor using GreenFiber, Knauf, CertainTeed, or any other manufacturer, we can evaluate its condition, identify deficiencies, and specify the correct repair or augmentation. We don’t carry proprietary product lock-in, and we don’t claim exclusive or preferred status with any brand. The right material is the one that performs for your specific assembly, verified by blower-door testing after installation.
Signs You Need Spray Foam Insulation Right Now
- Rooms that won’t hold temperature. If your master bedroom runs 6°F warmer than the thermostat setting while the living room matches it, you likely have air leakage in the wall or ceiling assembly above that space. We see this pattern frequently in Schertz’s newer subdivisions where fast construction left gaps at top plates and electrical penetrations unsealed.
- High summer electric bills with no rate change. A Schertz home with proper air sealing and insulation typically sees summer cooling costs of $0.09-$0.14 per square foot. If you’re running significantly above that with a properly sized HVAC system, the building envelope is the likely culprit. Our blower-door test pinpoints the leakage rate in CFM50.
- Dust that returns quickly after cleaning. Fiberglass batts in leaky attics act as filters, trapping dirt from incoming air. When you pull back insulation and find gray or black staining on the paper facing, that’s filtered air leakage. Spray foam eliminates the filtration path by sealing the cavity.
- Hot second floors or bonus rooms. Stack effect pulls conditioned air upward in winter and pushes hot attic air downward in summer. Unsealed chases around plumbing vents, electrical runs, and duct boots create expressways for this air movement. Spray foam at the attic floor or roof deck stops the flow.
- Visible gaps or settled insulation in the attic. If you can see the tops of your wall plates or daylight through gaps around chimneys and duct penetrations, your attic floor is leaking conditioned air at a significant rate. These are the gaps we seal before any foam goes in.
Our Spray Foam Insulation Process - Step by Step
- 1
On-site assessment and blower-door test. We arrive at your Schertz home at the scheduled time, introduce the named technician you’ll work with, and run a blower-door test to establish baseline air leakage in CFM50. This single number tells us how much conditioned air your envelope is losing. We photograph existing conditions, identify thermal bypasses, and mark all air-sealing targets.
- 2
Written price and scope. Before any work starts, you receive a written price with a detailed scope of work and written warranty under our 365-Day Done Right Promise. Haven Standard Clause 1: flat price, written scope, written warranty before anyone lifts a tool. No surprises. No “we found more once we opened it up” add-ons.
- 3
Air sealing preparation. Our crew removes or works around existing insulation, seals all top plates with caulk or foam, boxes out can lights with fire-rated covers, seals around chimney chases and flues with proper clearances, and closes all penetrations through the attic floor. This step is never skipped. We photograph every sealed location for the Documented Photo Record.
- 4
Spray foam application. We set up containment, ventilation, and temperature controls per manufacturer specifications. The foam is applied in lifts to prevent exotherm damage, with depth gauges checked at multiple points per cavity. Applied thickness is documented with photos showing the gauge readings.
- 5
Final blower-door test and documentation. On applicable jobs, we run a second blower-door test and provide the before-and-after numbers showing your air-leakage reduction. You receive the written invoice, the warranty document, and the Documented Photo Record by email before the crew leaves. Under Haven Standard, the job isn’t closed until the documentation is delivered.
How Much Does Spray Foam Insulation Cost in Schertz?
A typical open-cell attic floor application in a 2,000-square-foot Schertz home runs $2,800-$4,500 depending on desired R-value and accessibility, which affects how much Spray Foam Insulation costs. Closed-cell garage ceiling work in the same footprint typically ranges $1,800-$3,200. Rim joist sealing for a standard slab-on-grade foundation runs $800-$1,600. Roof deck applications, which require vent sealing and often HVAC load verification, range $4,500-$8,000 for the same footprint. These are installed prices with air sealing included, not foam-only figures that leave the leakage paths open.
Several factors move the price within these ranges. Attic accessibility matters: a 12/12 pitch with limited headroom takes longer than a 5/12 with walkable decking. The condition of existing insulation affects prep time; removal and disposal of contaminated fiberglass adds $0.50-$1.20 per square foot. Desired R-value drives material volume: open-cell at R-30 requires roughly 8.5 inches, while closed-cell at the same R-value needs only 4.5 inches but costs more per board foot. Roof deck jobs may require HVAC contractor coordination if the system needs modification for the additional conditioned volume.
To avoid overpaying, get competing quotes in writing and compare scope details, not just bottom-line numbers. A lower price that skips air sealing or specifies thinner foam than needed for your climate zone will cost more in energy bills over time. We offer a Free Second Opinion on any written estimate: bring us a competing quote and we’ll review it with you line by line, identifying what’s included, what’s omitted, and where the scopes differ. Our estimates are free, detailed, and delivered in writing before any work starts.
Spray Foam Insulation Near Schertz - Our Service Area
We serve Schertz and the surrounding communities with typical response times of 20-40 minutes for estimates and same-day scheduling for most service work. Our primary service area includes Cibolo, Universal City, Selma, Converse, Live Oak, Windcrest, Kirby, New Braunfels, Terrell Hills, Alamo Heights, and Castle Hills. The clay soils and mixed construction eras across this region create similar envelope performance patterns: 1980s-1990s homes with minimal attic sealing, 2000s-2010s homes with better insulation but still leaky top plates, and recent construction with code-minimum foam that often misses critical junctions. We’ve worked in the older ranch homes near Schertz Parkway and the newer builds in The Crossvine, and we adjust our air-sealing priorities based on what each era typically gets wrong.
Serving Schertz, TX - Our Local Coverage Area
We’re based in the Schertz area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions - Spray Foam Insulation in Schertz
Spray foam insulation is a polyurethane-based material that expands on application to fill cavities, gaps, and irregular spaces with a continuous air barrier and thermal insulation layer. It comes in two densities: open-cell, which is soft and vapor-permeable, and closed-cell, which is rigid and vapor-resistant. Unlike fiberglass batts, spray foam adheres to substrates and seals air leaks simultaneously, which is why we specify it after completing dedicated air sealing of all penetrations.
Most residential spray foam jobs in Schertz are completed in one day, with larger roof deck or whole-house applications occasionally extending to two days. The foam itself cures within minutes, though full off-gassing requires 24 hours of ventilation before re-occupancy in most cases. We schedule accordingly and coordinate HVAC isolation when needed. Call (830) 402-5240 for scheduling - we typically have availability within 3-5 business days for non-emergency work.
Installed spray foam in Schertz ranges from $1.80-$3.50 per board foot depending on open-cell versus closed-cell selection, with most residential jobs falling between $2,800 and $6,500 total. A board foot is one square foot at one inch thickness, so a 2,000-square-foot attic at R-30 open-cell (about 8.5 inches) uses roughly 17,000 board feet. We provide exact board-foot calculations and line-item pricing in every written estimate. Call (830) 402-5240 for a free estimate with no obligation.
Yes, we install, repair, and augment spray foam from Icynene, Demilec, and all major manufacturers. We’ve applied Icynene open-cell products in hundreds of Schertz homes and maintain current equipment for Demilec’s closed-cell formulations. We don’t claim exclusive status with any brand, and we can evaluate and work with foam installed by other contractors regardless of manufacturer. Bring us your existing installation for assessment.
We answer calls 24/7 through a live person, and we can dispatch for urgent situations like failed insulation after roof leaks, rodent contamination requiring immediate removal and replacement, or HVAC failure traced to envelope problems. True emergencies in spray foam are rare; most issues develop gradually. For urgent scheduling, call (830) 402-5240 and we’ll assess whether same-day or next-day service is warranted.
All completed spray foam work is covered by our 365-Day Done Right Promise: if it’s not done right, we make it right. The specific warranty terms are provided in writing before work starts, including coverage for material adhesion, thickness, and R-value performance. Manufacturer warranties on the foam itself run 10 years to lifetime depending on product, and we register these on your behalf. Haven Standard requires that every promise be in writing before any tool is lifted.
Clear attic access paths and remove stored items from work areas; our crew can handle heavy items with advance notice. Ensure pets are secured away from the work zone, as the application equipment and curing foam present hazards. We’ll isolate HVAC systems and cover finished surfaces as needed. You don’t need to be present for the full installation, though we do a walkthrough at completion to review the blower-door results and documentation. Call (830) 402-5240 to schedule your pre-installation assessment.
Schedule Your Spray Foam Insulation Service in Schertz Today
Call (830) 402-5240 for a free estimate on our Spray Foam Insulation in Cibolo and Schertz. We’ll schedule a blower-door assessment, provide a written price before any work starts, and deliver documented results you can verify. Our phones are answered by a live person 24/7, and we serve Schertz, Cibolo, Universal City, and surrounding communities with same-day availability for most service requests. Every job is backed by the 365-Day Done Right Promise and The Haven Standard since 2016.
Written by Wes Okafor, Owner at Topside Attic Insulation Schertz, serving Schertz, Cibolo, and Universal City since 2016.