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Why is my foam yellowing after 2 years? Client concerned

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  • September 15, 2024 at 10:00 am #2748
    Carlos Ybarra
    Member

    Applied 2 lb closed cell in an unvented attic about 2 years ago. Client called saying the foam has turned yellow/amber. Is this a defect? Should I be worried?

    September 15, 2024 at 12:30 pm #2750
    Amy Chambers
    Member

    Very normal! Closed cell foam yellows and darkens over time when exposed to UV light and air. It is purely cosmetic and does not affect performance at all.

    September 16, 2024 at 9:00 am #2752
    Lisa Hutchinson
    Member

    Agreed, it is just oxidation. If the foam is in an attic with any light penetration it will yellow faster. Performance-wise your R-value and air seal are unchanged.

    September 16, 2024 at 11:00 am #2753
    Carlos Ybarra
    Member

    That is a relief! Should I coat it with anything? I have seen some people apply intumescent paint for fire protection.

    September 17, 2024 at 8:30 am #2755
    Amy Chambers
    Member

    For an accessible attic you may want to check your local code. Some jurisdictions require a thermal barrier over exposed foam. It is a fire code requirement not just about color.

    September 17, 2024 at 2:00 pm #2757
    Rex Harrington
    Member

    Intumescent coatings like No-Burn or DC315 are your best bet if code requires a thermal barrier and you do not want to hang drywall. Make sure the coating is ICC-ESR listed for your specific foam.

    September 18, 2024 at 9:00 am #2759
    Carlos Ybarra
    Member

    Excellent info! Will check local code and look into the intumescent coatings. Thanks!

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