Icynene Wall Insulation Nationwide | Walt’s Insulation

Icynene Wall Insulation in San Antonio: What to Know First

We provide independent Icynene wall insulation service across San Antonio, and most jobs are done the same day we arrive, assuming the wall cavities are accessible. Pricing runs $1.80 to $3.10 per square foot for Icynene wall foam work in this market, depending on whether we’re doing drill-and-fill on existing walls or open-cavity spray on new construction or remodels. If you own a home with Icynene in the walls and something feels off, this page tells you what’s actually happening and what it costs to make it right.

Call (866) 751-4428

This is written for San Antonio homeowners who already have Icynene wall insulation, or who are weighing it against other options. Our team has worked with Icynene products since the early 2000s, and we see the same failure patterns repeat across specific neighborhoods, from Alamo Heights to Stone Oak to Helotes. Call (866) 751-4428 and a real person answers. That’s not a slogan; it’s how Walt runs the place.

One thing up front, so there’s no confusion: Walt’s Insulation is an independent Icynene service provider. We are not affiliated with or authorized by Icynene. We install, repair, and replace their products because we think a lot of them are good materials. But we don’t answer to the manufacturer. We answer to you.

Key takeaways:

• Icynene wall foam repair in San Antonio typically runs $1.80-$3.10 per square foot.
• Most jobs are completed same-day when wall access is straightforward.
• The two Icynene lines we see most in San Antonio walls are the classic open-cell (Icynene Classic) and the closed-cell (Icynene ProSeal / ProSeal LE).
• The biggest cause of Icynene problems in this climate is water intrusion, not the foam itself.
• Every Icynene job we do is covered by the Done Right Promise: lifetime workmanship, no fine print.

How Icynene Products Fail - and How We Fix Them

Icynene foam is a decent product when it’s installed correctly. But “correctly” in San Antonio means something different than it does in Dallas or Houston. Our heat, our humidity, and our clay-heavy soils all put specific stresses on wall insulation. Here’s what we see, wall by wall, job by job.

• Classic open-cell shrinkage at the top plate. Icynene Classic, the open-cell formulation, can pull back from the top plates of exterior walls over time, especially in homes built during the 2000s boom when crews were moving fast. What you notice is a warm band near the ceiling in summer. The fix is usually drill-and-fill injection into the gap, not a full re-spray.
• ProSeal closed-cell delamination from OSB sheathing. With Icynene ProSeal, the closed-cell line, we sometimes see the foam separate from the sheathing when the wall cavity wasn’t dry at spray time. The foam sets up, but it never fully bonds. This shows up as cold spots on interior walls in winter. Fixing it means cutting out the delaminated section and re-spraying, which is a surgical job, not a whole-wall project.
• Rodent tunneling in open-cell walls. Open-cell Icynene is soft enough that rats and mice can tunnel through it. We see this regularly in older San Antonio neighborhoods like Tobin Hill and Government Hill, where pier-and-beam foundations give rodents easy wall access. The fix is removing the compromised foam, sealing entry points, and re-insulating. If we find rodent damage, we’ll tell you before we touch anything, because that’s a separate conversation about exclusion work.
• Settling at the base of retrofit walls. When Icynene is installed as a drill-and-fill retrofit, the installer’s hole pattern matters. Too few holes, or holes in the wrong places, leave voids at the bottom of the cavity. We use an inspection scope to map those voids, then drill and fill exactly where the foam is missing. You don’t need a re-spray; you need someone who knows where to look.
• Odor from bad installs. A small but real number of Icynene installations produce a lingering off-gassing odor when the A and B components were mixed wrong, or when the foam was sprayed too thick in a single pass. In San Antonio’s heat, that smell gets worse, not better. We can identify the cause and discuss whether removal or encapsulation is the more practical path. This one’s rare, but when it happens, homeowners usually call us after two other companies couldn’t figure it out.

One San Antonio-specific note that Icynene’s own documentation won’t tell you: our summer humidity means any open-cell wall foam that gets wet from a window leak or plumbing drip will hold that moisture against your studs. Closed-cell ProSeal resists bulk water, but open-cell Classic acts like a sponge. If you’ve had a leak and you have open-cell in the walls, get it checked before rot sets in.

Our Icynene Wall Insulation Process

Here’s how a typical Icynene wall job goes, from the first call to the last cleanup sweep. This is the same sequence Walt’s crew has used on hundreds of San Antonio homes.

1. 1
   Call and describe the problem. You call (866) 751-4428. A live person answers, 24/7. We’ll ask what you’re seeing: uneven temperatures, high bills, drafts, odor, rodent signs. That first conversation usually tells us whether we need a scope inspection or can go straight to job planning.
2. 2
   On-site inspection and scope mapping. We come out, find the exact problem, and map the affected wall cavities. For retrofit work, this means running a camera scope through existing access points or small probe holes. For open-cavity work, we measure the stud bays and check substrate dryness. No guesswork, no “we’ll figure it out when we open it up.”
3. 3
   Parts and material decision. We walk you through OEM Icynene materials and quality aftermarket options from brands we know hold up in this climate, including Owens Corning, Rockwool, and Demilec. If you have a warranty claim, we’ll tell you honestly whether it’s worth pursuing through the original installer. If you don’t, we’ll show you what replacement materials cost and why we recommend what we do.
4. 4
   The repair or installation. For drill-and-fill, we drill at the right spacing for Icynene density, inject in controlled lifts so the foam doesn’t over-expand and bow your drywall, and patch holes cleanly. For open-cavity spray, we mask, prep, spray, and trim flush. Our techs are background-checked and uniformed, so you know exactly who’s in your house.
5. 5
   Verification and thermal check. We don’t pack up until we’ve verified the cavity fill with a thermal camera. If it’s not right, it gets corrected on the spot. That’s the whole point of the name on the door.
6. 6
   Cleanup and documentation. We leave the work area cleaner than we found it, and you get a written record of what was done, what materials went in, and what’s covered under the Done Right Promise. Lifetime workmanship. If it’s not done right, we make it right. No runaround.

What Icynene Wall Insulation Costs in San Antonio

Icynene wall insulation costs in San Antonio generally land between $1.80 and $3.10 per square foot, depending on the job type and condition. Here’s a breakdown of the most common scenarios we price:

• Drill-and-fill retrofit into existing walls: $2.20-$3.10 per square foot, including patching.
• Open-cavity spray (new construction or gut remodel): $1.80-$2.60 per square foot.
• Partial repair (cavity mapping, removal of compromised foam, re-fill): $400-$900 for a typical single-wall repair in a San Antonio home.
• Full removal and replacement of failed Icynene in one exterior wall: $1,400-$2,800, depending on wall size and access.

What moves the price: whether we can access the stud bays from outside (stucco makes exterior access slower and more expensive than siding), whether there’s existing damage from water or rodents, and whether the job requires scaffolding on a two-story wall. Estimates are free, and we mean free. Call (866) 751-4428 and we’ll come look, no trip charge inside the service county.

Why San Antonio Homeowners Call Walt’s Insulation for Icynene Work

We’ve been doing this since 2000, and we’re still the one down the road, not a franchise with a rotating crew and an 800 number. Walt Brenner started this business after watching too many San Antonio homeowners get sold insulation that didn’t match the South Texas climate, and he’s never been interested in becoming a volume shop. Every job carries the Done Right Promise: lifetime workmanship, and if it’s not done right, we make it right.

When your Icynene needs attention, you get answers, not a sales pitch. We answer the phone live, talk to a real person, get a straight answer. Our techs know how Icynene behaves in San Antonio’s heat and humidity because they’ve fixed it here for years, not learned it from a manufacturer video. And if Icynene isn’t the right material for your particular wall, we’ll tell you that too. We stock and install alternatives including Owens Corning, Rockwool, Demilec, Johns Manville, CertainTeed, Knauf, GreenFiber, and Reflectix, so the recommendation you get is the one that fits your house, not the one we’re pushing this month. We’re locally owned, owner-operated, with a published address and license number. Call (866) 751-4428 and ask for a free estimate, or bring us a written quote from anyone else and we’ll give you a second opinion free.

FAQs

Get Your Icynene Walls Checked, Free

If something feels off with your Icynene wall insulation in San Antonio, or if you’re building or remodeling and want a straight answer on whether Icynene is the right product, call (866) 751-4428 for a free estimate. $40 off any repair over $200. Free second opinion on any written estimate. No trip charge in our county. And if you’re a senior or veteran, 10% off, always. We answer the phone live, 24/7. The one down the road.

Written by Walt Brenner, Owner, Walt’s Insulation at Walt’s Insulation, serving San Antonio and nearby areas.