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Community and Q&A

Tape Compatible with Intumescent Paint

molly54321 | Posted in Green Products and Materials on

Hi All,
I’m installing a poly vapor barrier over the dirt in my crawl space and I just discovered that neither 3M flashing tape nor WST-PRO will stick to the intumescent paint on the (foamed) walls. Moisture isn’t an issue-the walls are dry. Anyone have suggestions for a tape that might stick effectively to the intumescent paint and be vapor impermeable? Perhaps something that will stick to concrete would work? Thanks in advance for you help!

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  1. Jon_Harrod | | #1

    I’m not aware of any tape that will work well for this. I would first try to immobilize the poly with ground spikes and masonry fasteners, then use a one-component foam to seal the poly to the walls. High-pressure closed-cell spray foam also works great in this application but is difficult to justify unless a crew is already on-site.

  2. Expert Member
    Michael Maines | | #2

    I have not tried it but if any tape would work, it would be Siga Fentrim. It's vapor permeable but there would be little area for moisture transfer so it shouldn't matter.

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