Icynene Crawl Space Encapsulation Nationwide

Icynene Crawl Space Encapsulation: The West Hollywood Owner’s Guide

Icynene open-cell spray foam installed in West Hollywood crawl spaces typically runs $4.20 to $6.80 per board foot installed, with most full encapsulation jobs landing between $3,200 and $5,800 depending on crawl square footage and whether the rim joists need dense-pack treatment. We stock Icynene LD-C-50 and MD-R-200 series components on our West Hollywood trucks, and we can usually inspect and quote same-day. Most homeowners realize something’s wrong when their hardwood floors start cupping or a musty smell persists despite running a dehumidifier - signs that the vapor barrier or foam layer has compromised and moisture is migrating through the envelope.

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Which Icynene Models This Applies To

Icynene’s crawl space line breaks into two families: the LD-C-50 light-density open-cell system (0.5 lb/ft³, R-3.7 per inch) and the MD-R-200 medium-density closed-cell system (2.0 lb/ft³, R-6.0 per inch). The LD-C-50 is what we see under most West Hollywood bungalows and 1960s ranch homes with vented crawls that got converted in the 2010s; the MD-R-200 shows up in newer builds or where the homeowner wanted a Class II vapor retarder in a single pass.

Check the yellow Icynene spec label on your rim joist or subfloor - it’ll read either “LD-C-50” or “MD-R-200” plus a batch date. Pre-2018 LD-C-50 can develop adhesion issues if the substrate wasn’t primed with Icynene’s CP-01 cleaner, which is a compatibility gotcha we run into regularly in the flats near Melrose where humidity spikes in winter. We carry both OEM Icynene resupply kits and equivalent aftermarket foams from Demilec that match the density and vapor permeance specs; for warranty continuity on newer installs, we default to OEM. For older systems out of warranty, the aftermarket equivalent saves roughly 15% on material without changing performance.

Signs Your Icynene Crawl Space Encapsulation Is Failing

• Floor cupping or buckling above the crawl. When Icynene separates from the rim joist or develops shrinkage cracks, warm moist air hits the cool subfloor and the wood absorbs it. We see this most in West Hollywood’s 1920s Spanish revivals where the original crawl vents were never fully sealed.
• Persistent musty odor that returns within 48 hours of dehumidifier cycling. Healthy encapsulated crawls should smell like nothing. If the odor comes back fast, the foam’s surface skin has likely degraded and is trapping organic material against the joist bays.
• Visible yellowing or powdering on the foam surface. Icynene’s open-cell chemistry is UV-stable in darkness, but if a previous contractor left gaps near perimeter access doors, filtered daylight triggers photodegradation. The foam turns from cream to mustard and begins to dust.
• Condensation on ductwork or plumbing lines in summer. This means the effective R-value has dropped below the dew-point threshold - usually because the foam thickness is now insufficient after settling, or because air gaps behind the foam are creating thermal bypasses.
• Energy bills climbing year-over-year with no HVAC changes. A blower-door test will show elevated CFM50 from the crawl zone; we regularly find 800-1,200 CFM50 of leakage path through failed Icynene seams in homes west of Fairfax.

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Replacement Cost & What’s Included

In West Hollywood, most Icynene crawl space re-encapsulation jobs run $3,200 to $5,800 for a typical 800-1,200 square foot crawl. The lower end covers spot repair of 20-30% of the surface area with LD-C-50, including removal of degraded foam, substrate re-prep with CP-01 or equivalent, and reapplication to original thickness. The upper end applies to full removal and re-encapsulation with MD-R-200, including new 6-mil polyethylene ground cover seam-sealed to walls, rim joist treatment, and a post-job blower-door test.

What drives the range: crawl height (anything under 18 inches adds labor), existing vapor barrier condition, and whether we find rodent damage requiring sanitation before foam goes back in. Every job gets a Written Price Before Any Work Starts under Haven Standard Clause 1, plus a Documented Photo Record and before-and-after blower-door numbers where applicable. Our 365-Day Done Right Promise covers adhesion failure or density shortfall.

DIY or Call Us?

Here’s what you can safely check yourself: verify the Icynene label series, measure any visible gaps with a tape, and photograph discoloration for reference. What you should not do: purchase two-part foam kits from a hardware store and attempt to fill gaps. Icynene’s reaction chemistry requires controlled temperature, humidity, and substrate moisture content - outside the specified range, you get off-ratio foam that won’t adhere and will off-gas improperly. The MD-R-200 iso component is also a skin and respiratory sensitizer.

We also stock parts for Reflectix radiant barrier systems if your crawl has a hybrid assembly. Topside Attic Insulation West Hollywood is an independent service provider, not affiliated with Icynene. Call (213) 306-2607 and we’ll read your situation with you - free second opinion on any written estimate you’ve already received.

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