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Thread: drywalling concrete wall - help!

  1. #1
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    Default drywalling concrete wall - help!

    Hi all

    One for the DIY'ers here.
    I'm planning on boarding out and insulating my garage. The garage is made from concrete section so I'm planning on battoning it all up and boarding over the top with insulation in the middle. I'm ok with that bit. But I'm wondering if this would cause me any moisture problems?
    Should I protect against it anyway?
    What would you recommend for this?

    Any help would as always be appreciated

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    Regular Member JuzzyD's Avatar
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    I'm sure I watched a Challenge Tommy Walsh recently where they used a kind of bitumin paint on the inside of a garage for a moisture barrier then put up the battens, insulation and plaster boards.

    I would think you will need at least a plastic membrane on the walls.

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    yeah I have read about something that you can paint on but to be honest as it's only the garage I might just go for the plastic sheeting stuff unless anyone can convince me otherwise?

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    I would think that the hardest part of using plastic sheeting is holding it in place.

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    I am currently converting my garage and all it needs is sealed loft insultation and away you go. If moisture gets through as you have battoned the wall with wood it wont get onto the plasterboard.

    It would take some really bad driving rain to completely soak the concrete.

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    Quote Originally Posted by mushy2007 View Post
    It would take some really bad driving rain to completely soak the concrete.
    Yeah I suppose your right there, the outside is also rendered with those stone thingies in it so that should be fine I reckon.
    The roof is probably going to be the most diffcult as that has shown signs of damp on really bad rain. Never leaks mind, just a couple of damper patches here and there.

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    To stop the moisture pentrating the brickwork, paint or use a garden sprayer the outside of the garage with weathershield type sealer. Its brilliant stuff, Part of my utility room is single brick and moisture was coming through so i sprayed the outside and its now bone dry inside. Its colourless and just soaks into the brick much like creosote soaks into fence panels. Comes in gallon cans

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    right the first thing to do is seal the joints in the garage with mastic. then like you say batten out at 400mm or 600mm centres, then insulate with 25mm isowall barrier, then i would recommend using moisture plasterboard(green)
    this is a bit more expensive £2.47 per sqm but better suited, remember to leave 20mm clearence of the floor.

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    leave a ventilation gap like when doin a loft conversion ,
    ie couple of low down vents and couple higher up.
    letting air between outside wall and insulation

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