Spray foam inside

Discussion in 'The Beginner' started by Yomper, Aug 2, 2016.

  1. Yomper

    Yomper Funster

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    Hi
    I just bought an xlwb boxer I want to spray.foam. I bought some cans of no nonsense spray cans £2 each bargain I know! . Tested a can and cut back the foam only to find its lik we a sponge!! Are the 2 part foam.kits that sell for £250 or so the same on the inside. As if I cut it back to fit panels ot will be like a sponge!
     
  2. Mattyjwr

    Mattyjwr Funster Life Member

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    I haven't tried 2 part foam, if there is such a thing but was warned about expanding foam being like a sponge and not to use it between metal panels (I wanted to reduce sound levels in the van) as it holds water and increases the likelihood of rust developing.

    I guess you are using it as a panel, you night try spraying some into the rough shape and pushing it into shape with wet tools and spraying it all over with water to stop it expanding further.
     
  3. Figaro

    Figaro Funster

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    I think water encourages foam to expand further !
     
  4. canopus

    canopus Funster Life Member

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    There are specialist firms out there who will insulate with spray foam. We had our steel narrowboat spray foamed insulated. Masking tape was stuck on all the treated wooden bearers. It was then a bit fiddly cutting the foam back when it came to lining out.
     
  5. Yomper

    Yomper Funster

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    I was going to use one if them businesses who do it for you but I haven't seen any photos of how it looks when it's finished.
    If the did spray kits are still vapour proof after trimming I think I want to so it myself.
    Otherwise I think it's kingspan and spray foam in pillars
    The can I used formed a skin which looked waterproof bur after trimming on the bit I tested it was like a cross between sponge and cotton wool. I thought closed cell was like the stuff used in packaging tvs and stuff.
    The can I used was the black n white no nonsene. I hope the 2 part closed cell spray kits are different
     
    Last edited: Aug 2, 2016
  6. Gromett

    Gromett Funster

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    I did mine in two part and it is the best insulation money can buy.

    There is a professional who has lots of experience of doing vans. I don't know his name but you can ask on our sister site.

    http://www.diymotorhome.co.uk/community/

    Please note the two part foam gets hot and if you don't apply it properly it can buckle panels. But it goes on really well and bonds firmly to the metal panels. It stops condensation as well and is a fantastic insulator. I have been living in my van for 6+ years now even through the winters without feeling the cold at all.

    Got a brief walk through on my blog of my two pack spray job.

    https://www.fulltiming.info/self-build-motorhome/redoing-insulation-stage-1
     
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  7. rosalan

    rosalan Funster

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    Like Gromett says, some of the expanding foam can expand and distort panels as I discovered when working on a home build and injected the roof.
     
  8. Yomper

    Yomper Funster

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    Thanks for the help. Never done anything quite so daunting my main concern about the build is condensation as I will use it all year living in it for 90% of it.
    So I take it the cans are crap but the 2 part foam really is closed cell.
    I have read and read on spray foam but never seen some decent shots...UNTIL NOW.best £15 I spent this year.
     
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  9. Gromett

    Gromett Funster

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    If you are going to be living in it I will give some recommendations.

    1) Spray foam and get it done by a pro.
    2) Vapour barrier. Do this properly.
    3) Get the underside and sills fully rust treated before doing anywork.

    I didn't and my van has rotted from under me. The bits where I didn't spray foam have allowed condensation to form which has fallen down through the sills and rotted them.

    My next van I will be going gung ho on rust treatments, proper pro job on the insulation and heavy duty vapour barriers. The next one will last me :)
     
  10. Yomper

    Yomper Funster

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    OK I'll start looking at rust treatment now!
    Maybe if I spray foam floor and use foil over it will stop water forming?
    I been trying to work out what to do to bottom of van walls along the bottom where it has rib holes where it meets floor. There's meant to be drain holes but I don't want to block them...just in case. I may fill with plastic insulation and foil over.
    Any idea where I can get sills rust treated
     
    Last edited: Aug 2, 2016
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