Demilec Attic Insulation Nationwide

Demilec Attic Insulation: The Fort Worth Owner’s Guide

Demilec attic insulation in Fort Worth typically costs $1,850 to $4,600 installed, with most homes landing around $2,600 for a full attic re-insulation using Demilec spray foam or Demilec-approved loose-fill where the existing product has failed. We stock Demilec-compatible products on our trucks and can usually assess the damage and quote the same day. Most Fort Worth homeowners discover a problem the same way: a bedroom that suddenly runs hot in July, a utility bill that ticks up month after month, or a damp spot on the ceiling that shouldn’t be there. The insulation itself rarely announces failure. The house does.

Call (682) 233-8300

Which Demilec Models This Applies To

Demilec manufactures two main product lines we work with in Fort Worth attics: Heatlok HFO, a closed-cell spray foam that comes in two lb densities, and Sealection 500, an open-cell foam used where attic air-sealing matters more than maximum R-value. Closed-cell foam like Heatlok delivers around R-7 per inch. Open-cell Sealection delivers roughly R-3.8 to R-4.1 per inch. The compatibility gotcha most homeowners don’t know: closed-cell and open-cell foams are not interchangeable after installation. If your attic has Heatlok failing in one section, that section gets Heatlok repair, not a Sealection patch, because mixing densities creates moisture traps at the seam. We identify your exact product by checking the original install paperwork or, when that’s missing, by a small sample cut from an inconspicuous area. A fingernail test tells us which foam we’re dealing with in under five seconds. The OEM vs aftermarket decision for Demilec is simpler than for some brands: because spray foam bonds chemically to the substrate, using a non-Demilec product mid-repair affects the chemical bond. We carry Demilec product for Demilec repairs, period. But we also stock Reflectix radiant barrier for Fort Worth attics where the original Demilec install never included it, because Texas ceilings bake from above and a radiant barrier under the roofline makes any insulation work better.

Signs Your Demilec Attic Insulation Is Failing

• Uneven room temperatures between floors. When Demilec foam pulls away from rafters or sheathing, attic air floods the gaps and the second floor runs five to eight degrees warmer than the thermostat says. We see this after freeze-thaw cycles in Fort Worth winters that flex the roofline just enough to compromise the bond.
• A soft or spongy feel underfoot in the attic. Open-cell Sealection absorbs moisture when roof leaks go unnoticed, and saturated foam compresses under its own weight. R-value drops fast once the cell structure holds water.
• Higher summer cooling bills with no change in thermostat habits. Demilec foam doesn’t settle like fiberglass, but failed adhesion, animal damage, or incomplete original coverage cuts the thermal barrier. A $40 to $90 monthly jump in cooling cost, same usage, is a classic first signal in Tarrant County.
• Moisture staining or condensation on attic-facing drywall. Failed closed-cell foam lets humid Fort Worth air reach cold surfaces and drip. Look for a brownish ring or a faint mildew smell near the attic hatch.
• Visible gaps, cracking, or fallen sections of foam. Raccoons, squirrels, and roof rats in Fort Worth tear through foam for nesting paths. We find their tunnels most often along the eave edges and around vent penetrations.

Replacement Cost & What’s Included

Every Demilec attic insulation quote in Fort Worth starts with a written price before any work begins. Full Demilec attic re-insulation typically runs:

• Open-cell Sealection 500 removal and reinstall: $1,850 to $3,400 depending on attic square footage and access.
• Closed-cell Heatlok HFO partial repair: $900 to $2,200 for sections where the foam has pulled away, cracked, or been damaged by animals.
• Full closed-cell Heatlok removal and replacement: $3,200 to $4,600, which includes disposal of the old foam, surface prep, and re-spraying to code-required depth.

What drives the range is straightforward: how much foam has to come out first, how easy the attic is to reach, and whether we’re repairing a seam or doing a full pull-and-replace. Parts and labor are never bundled into a mystery number. You see the material line, the labor line, and the total. And the 365-Day Done Right Promise covers every Demilec job we do in Fort Worth: if it’s not right, we come back and make it right at no charge.

DIY or Call Us?

Spray foam insulation is not a DIY product, and we say that as a crew that genuinely wants homeowners to understand what they’re looking at. Checking whether your Demilec foam has pulled away from the rafters is safe to do from the attic hatch with a flashlight. Cutting into foam, scraping it off studs, or attempting a patch with a can from the hardware store is where it goes wrong: two-part polyurethane foam generates heat when mixed, off-gasses during application, and requires a respirator, full skin coverage, and ventilation. The can you buy at the hardware store is single-component foam, which never bonds correctly to existing Demilec and creates exactly the moisture-trapping seams we warn about. If you suspect a failure, call us at (682) 233-8300 and we’ll inspect it. The inspection tells us what you have and what it needs, and you’ll have a written number before anyone touches a rafter.

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