1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

PIR boards

Discussion in 'Plastering and Rendering' started by Richhen, 11 Sep 2017.

  1. Richhen

    Joined:
    19 Mar 2016
    Messages:
    16
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi all,

    DIY'er looking for some advice.....
    After some kitchen alterations, I have an external brick wall 2.4m x 2.4m which I need to insulate and plaster.
    My building warrant plans specify Celotex PL4050 which is a PIR board with 50mm insulation and 12.5mm plasterboard combined as one sheet.
    Turns out there is a nationwide shortage of PIR board and deliveries are approx 4 weeks at earliest - I can't wait this long!
    As a diy'er new to this, I'm keen on the combined insulation/plasterboard as it seems easier.
    Do I need to use PIR board? How does this differ from standard insulated plasterboard? It's a small wall so could I get away with out the PIR or is there something else I can do to the wall to compensate for not using PIR board?
    Many thanks for your advice!

    Rich
     
  2. B17NNS

    Joined:
    2 Oct 2013
    Messages:
    25
    Thanks Received:
    2
    Location:
    Staffordshire
    Country:
    United Kingdom
    Can you not find an alternative board with an equivalent uValue?
     
  3. Richhen

    Joined:
    19 Mar 2016
    Messages:
    16
    Thanks Received:
    0
    Country:
    United Kingdom
    I can get the insulation board, but without the plasterboard attached. I assume I can stick the insulation board to the wall with adhesive and then stick the plasterboard to that. Seems simple enough - almost too simple! - am I missing something???
     
  4. DIYedboy

    Joined:
    14 Oct 2008
    Messages:
    859
    Thanks Received:
    8
    Location:
    Surrey
    Country:
    United Kingdom
    Be careful...............if the board is aluminium faced, the only thing that will stick it long term is foam adhesive (the minimal expanding type), you'll then have to foam the plasterboard to that.
     
  5. Richhen

    Joined:
    19 Mar 2016
    Messages:
    16
    Thanks Received:
    0
    Country:
    United Kingdom
    Ah, that's a good tip, thanks
    Would it be better and more proper to stick the insulation board to the wall, then batton the front of the insulation, then screw the plasterboard to the batons, or perhaps the stick together approach (with the correct foam of course) will be adequate. It's only a small wall 2.4m x 2.4m. Thanks
     
  6. DIYedboy

    Joined:
    14 Oct 2008
    Messages:
    859
    Thanks Received:
    8
    Location:
    Surrey
    Country:
    United Kingdom
    If it was me, I'd foam the celotex to the p/b then foam the combined unit to the wall, remember you are also supposed to bung in at least 3 mechanical fixings per board in order to comply with fire regs (if there's a fire the boards may fall off the wall and block an exit route)
     
  7. Richhen

    Joined:
    19 Mar 2016
    Messages:
    16
    Thanks Received:
    0
    Country:
    United Kingdom
    Thanks DIYedboy, that's great advice and exactly why these forums are so helpful.
     

Share This Page