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

"vapour control layer nailed to the deck"

Discussion in 'Roofing and Guttering' started by elmsoft, 6 Sep 2017.

  1. elmsoft

    elmsoft

    Joined:
    3 Mar 2008
    Messages:
    199
    Thanks Received:
    9
    Location:
    Gwynedd
    Country:
    United Kingdom
    The plans for my extension specify

    "[Thermaroof] insulation to be bonded to 18mm plywood with vapour control layer nailed to the deck sealed with hot bitumen."

    I can't quite understand what gets fixed to what, how, and in what order! :?:

    Anyone help?
     
  2. chappers

    chappers

    Joined:
    27 Aug 2004
    Messages:
    3,254
    Thanks Received:
    357
    Country:
    United Kingdom
    VCL nailed to the deck then sealed with bitumen, then the insulation which has ply top deck fixed to all that.
    so order from bottom up.
    joists
    furring pieces
    ply sub deck
    VCL
    bitumen
    insulation with bonded ply top deck
    roof covering
     
    • Thanks Thanks x 1
  3. Sponsored Links
  4. elmsoft

    elmsoft

    Joined:
    3 Mar 2008
    Messages:
    199
    Thanks Received:
    9
    Location:
    Gwynedd
    Country:
    United Kingdom
    Thank you . That makes things clearer.
    Is the bitumen heated in a tar boiler and poured over the VCL ? And that bonds the Thermaroof so I don't need mechanical fixing of the insulation?
     
  5. chappers

    chappers

    Joined:
    27 Aug 2004
    Messages:
    3,254
    Thanks Received:
    357
    Country:
    United Kingdom
    I suppose so, but have never seen it done I would personally skip that bit. In fact my lay up would be ;
    joists
    furring pieces
    sub deck all fixed to joists
    VCL
    insulation
    top deck, fixed through insulation to sub deck
    roof covering
    if you are really concerned that you have pierced the VCL to hold the deck down, then you can always use a polythene layer under the joists, between them and the plasterboard.
    Don't forget to insulate the open voids at the ends of your joists too.
     
  6. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
  7. Sponsored Links
Loading...

Share This Page