Icynene Crawl Space Encapsulation Nationwide

Icynene Crawl Space Encapsulation: The New Braunfels Owner’s Guide

We stock and install Icynene-compatible crawl space encapsulation systems in New Braunfels, with most complete jobs running between $2,800 and $5,400 depending on crawl footprint and existing moisture damage. Same-day starts are available when we have your liner spec on the truck, which we do for Icynene MD-R-200 and LD-C-50 series in common widths. Most homeowners realize something’s wrong when their dehumidifier runs nonstop in winter or they catch a musty spike coming through the floor registers after rain.

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Which Icynene Models This Applies To

Icynene’s crawl space line breaks into two series that matter for encapsulation matching. The MD-R-200 is the medium-density closed-cell spray foam used on rim joists and band boards, typically applied at 2-3 inches for a Class II vapor retarder. The LD-C-50 is the light-density open-cell used in above-grade walls, not below-grade, though we see it mis-spec’d in New Braunfels crawl spaces more often than you’d think, especially in spec homes built during the 2019-2021 rush.

To identify what you have, check the application tag left by the original installer, usually stapled to a floor joist near the access hatch. No tag? The foam itself tells you: MD-R-200 cures to a rigid, pale-yellow surface that doesn’t indent under thumb pressure; LD-C-50 stays soft and spongy, like stale bread. The encapsulation liner that pairs with MD-R-200 needs to be a 12-mil or 20-mil reinforced polyethylene with a perm rating under 0.1, or the closed-cell foam and liner create a double vapor barrier that traps condensation. That’s the compatibility gotcha we fix most often in Comal County jobs.

We source OEM-grade Icynene-compatible liners through our supply house, but we also carry a Johns Manville equivalent that meets the same ASTM E1745 Class A standard at a lower per-roll cost. The JM liner carries the same 25-year warranty when installed to spec. We are an independent service provider, not affiliated with Icynene, so we have no brand lock-in forcing one choice over the other.

Signs Your Icynene Crawl Space Encapsulation Is Failing

• Condensation beading on the liner underside. This means your vapor barrier has separated at the seams or the Icynene foam has pulled away from the sill plate, letting warm, humid New Braunfels air hit the cool surface. The tape failed, or the foam was sprayed over a damp substrate and never bonded.
• Soft spots in the subfloor above. Moisture that gets past a compromised encapsulation system wicks into OSB or plywood over months, not days. By the time you feel bounce underfoot, the damage is usually 12-18 months along.
• Dehumidifier running 18+ hours daily in December or January. A properly sealed crawl space in New Braunfels should need minimal winter dehumidification. If yours is working overtime, the envelope has a breach, often at the access door or where a plumbing penetration was cut after the original install.
• Musty odor spiking after hard rain on the Guadalupe watershed. Homes near the River Road corridor sit on clay-heavy soils that hold water. When the water table rises fast, any gap in the encapsulation becomes a wicking point. The smell is mold volatiles, not just dampness.
• Insulation falling from band joists. Icynene MD-R-200 doesn’t fall unless the wood it adhered to was wet at application or has since rotted. Either way, the encapsulation failed first and the foam is now a symptom, not the root cause.

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Replacement Cost & What’s Included

In New Braunfels, a full Icynene crawl space encapsulation replacement runs $2,800-$5,400 for crawl footprints between 800 and 2,000 square feet. Here’s how that breaks:

What drives the range: crawl height under 18 inches adds labor time, active mold requires remediation before we seal anything, and pier-and-beam foundations with 20+ piers need more cuts and seams than slab-on-grade perimeters. Every job gets a Written Price Before Any Work Starts under Haven Standard Clause 1, flat number, no open-ended hourly adders. The 365-Day Done Right Promise covers the encapsulation workmanship, and the liner itself carries the manufacturer’s 25-year material warranty.

DIY or Call Us?

What you can safely check: verify your dehumidifier is set to 55% relative humidity, not lower, and that the discharge hose isn’t kinked. Look at the access door for visible gaps or daylight. Anything beyond that, and you’re into the part of this job that goes wrong fast.

DIY encapsulation fails two ways in New Braunfels. First, the soil prep: if you don’t remove organic debris and level the vapor barrier substrate, you’ll have punctures within a year. Second, the seam work: hand-rolled tape in a humid crawl space bubbles and delaminates, and once moisture gets behind the liner, it’s trapped by design. We don’t recommend homeowners enter their crawl space with utility knives and adhesive in confined, poorly ventilated spaces. The material itself isn’t toxic once cured, but the physical ergonomics are genuinely hazardous, and a cut liner is worse than no liner.

We carry Icynene-compatible 12-mil and 20-mil rolls on the truck, along with the seam tape rated for the temperature swings we see between New Braunfels summers and the January cold snaps that drive stack effect. Call (830) 243-6352 and we’ll read your existing setup with you, no charge.

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