Frequently Asked Questions
What is spray foam insulation?
Spray foam insulation is a liquid-applied material that expands into a solid foam, sealing air leaks while insulating.
Can you spray foam insulation over mold?
No. Mold must be remediated first before installing foam.
Can mold grow on spray foam insulation?
Spray foam does not support mold growth, but mold can grow on dust or surfaces around it if moisture exists.
How thick does spray foam insulation need to be?
Closed-cell spray foam typically performs best at 2–3 inches, depending on the application and R-value goals.
Is spray foam waterproof?
Closed-cell spray foam is water-resistant and helps block moisture intrusion.
How long does spray foam insulation last?
Properly installed spray foam can last 30–50+ years without settling or degrading.
Is spray foam insulation safe?
Yes. Once cured, spray foam is non-toxic and safe for homes and businesses.
Does spray foam insulation reduce noise?
Yes. Spray foam helps reduce sound transmission, especially in walls and floors.
Can spray foam insulation be left exposed?
In some areas, yes, but many applications require a thermal or ignition barrier for code compliance.
What is the R-value of 2 inches of spray foam?
Closed-cell spray foam is roughly R-6.5 per inch, so 2 inches provides about R-13.
Does attic spray foam insulation increase indoor humidity?
No. When properly installed, it helps control moisture and humidity.
Can you spray foam around PEX pipe?
Yes. Spray foam is safe around PEX plumbing.
What does spray foam not stick to?
Spray foam does not adhere well to oil, grease, silicone, or dirty surfaces.
Will spray foam stop water leaks?
Spray foam can help seal air and minor moisture intrusion, but it is not a substitute for structural waterproofing.
Can you spray paint foam?
Yes. Cured spray foam can be painted or coated.
How long does it take for spray foam to dry?
Foam expands and hardens within minutes and is usually cured the same day.