Spray Foam Insulation Gone Wrong

Spray foam insulation can be incredibly effective when it is installed the right way. It seals gaps, improves comfort, and reduces energy loss. But when the application is rushed, uneven, or poorly mixed, it can create the exact problems it is supposed to prevent. Homeowners often experience trapped humidity, warm attic temperatures, sweating roof decks, musty odors, moisture pockets inside the foam, and even active mold growth.

If you are dealing with these issues after a spray foam installation, you are not alone. Our team has handled some of the most severe spray-foam failures throughout Los Angeles, and we specialize in diagnosing what went wrong and restoring your attic back to a safe, dry, and healthy condition.

• High humidity inside the attic: A trapped, muggy environment that never dries out.
• Condensation on roof decking or rafters: Water droplets forming on wood, nails, or metal surfaces.
• Mold or mildew growth: Dark spots or white fuzz on the foam, framing, or roof deck.
• Hot or cold spots in the home: Rooms that never feel comfortable despite running your HVAC.
• Musty or chemical odors: Off-gassing from poorly mixed foam or moisture buildup.
• Higher energy bills: Insulation that fails to regulate temperature or air movement.
• HVAC sweating or rusting: Air handlers, ducts, or vents showing moisture damage.
• Visible gaps or uneven foam: Thin areas, cracking, or inconsistent thickness along the attic.

Spray foam is meant to eliminate these issues. If your attic feels damp, smelly, or abnormally warm, the foam system is not performing the way it should.

When spray foam is installed incorrectly, several problems can occur:

• Improper mixing: Wrong temperature or ratio during application creates off-gassing, weak areas, and lingering odors.
• Incorrect thickness: Foam applied too thick or too thin prevents proper curing and traps moisture.
• Poor ventilation design: Closed-cell or open-cell foam installed without proper moisture management can cause humidity pockets.
• Missed gaps or coverage voids: Air leakage continues, causing condensation and comfort issues.
• Incomplete curing: Foam that stays tacky, soft, or crumbly, leading to long-term structural concerns.

Even a professionally installed HVAC system cannot compensate for insulation failure. Moisture and air pressure imbalances inside the attic will continue to worsen until corrected.

Our specialists have handled hundreds of attic remediation projects where spray foam was installed incorrectly. We provide:

• Full attic inspection and moisture testing to identify hidden condensation, humidity pockets, or mold spread.
• Thermal imaging to pinpoint failed areas of insulation and temperature irregularities.
• Mold remediation using safe, effective treatments for foam surfaces and wooden framing.
• Removal of bad foam when necessary to eliminate moisture traps or chemical odor sources.
• Ventilation correction to restore a balanced and healthy attic environment.
• Long-term moisture prevention with sealing, repair, and proper insulation techniques.

Every home is different, but our goal is always the same: restore your attic so it stays dry, clean, and structurally sound.

If your spray foam insulation has created humidity, odors, or mold issues, fast action is essential. The longer moisture stays trapped, the more expensive the repairs become.

Twin Home Experts can diagnose the problem and give you a clear plan to fix it.