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  1. #1
    Join Date
    Dec 2011
    Posts
    24

    Default Removing spray foam

    Hi,

    I need to expose the ends of some carriage bolts that some time ago were buried under spray foam insulation. I was surprised to find it difficult to "pick" it away, so I'm wondering if there is a solvent of some kind that might be used to dissolve the insulation or make it easier to remove in a case like this?

    Thanks,
    Dave

  2. #2
    Join Date
    Sep 2012
    Location
    Boston
    Posts
    823

    Default Re: Removing spray foam

    aside from the spray foam insulation gun cleaner which dissolves it prior to it becoming rigid, i believe you're going to have to do it the old fashioned way.

  3. #3
    Join Date
    Dec 2007
    Location
    Tennessee
    Posts
    1,381

    Default Re: Removing spray foam

    This is just from memory, which isn't all that reliable lately, but I recall something about PB Blaster dissolving a styrofoam cup in seconds. This is a spray penetrating oil and solvent available at most auto parts stores. Your foam may not respond to this as it is unlikely to be styrofoam.

  4. #4
    Join Date
    Aug 2007
    Location
    Portland, Oregon, formerly of Chicago
    Posts
    1,585

    Default Re: Removing spray foam

    None of the common solvents found at the hardware or homeowner stores will touch cured urethane foam. NMP will cut it, but i don't know where to get it commonly.

    Keith, we used to send the new guys down to the truck with a styrofoam cup to get some lacqer thinner. The lacquer thinner comes through the bottom of a styrofoam cup as if it weren't even there!

  5. #5
    Join Date
    Dec 2011
    Posts
    24

    Default Re: Removing spray foam

    Hi All,

    Thanks for the suggestions. I ended up going old fashioned. It actually wasn't too bad, I used a pair of needlenose pliers to pull out clumps. A little tedious, but it worked.

    Dave

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