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

Breather membrane, dpm, nowt, or NOTA for my shed floor

Discussion in 'In the Garden' started by pedr0, 22 Apr 2021.

  1. pedr0

    pedr0

    Joined:
    9 Jul 2008
    Messages:
    113
    Thanks Received:
    2
    Country:
    United Kingdom
    I'm building a shed on a concrete base and am wondering whether to put some membrane beneath the floor.

    I suspect the landscaper didn't put a DPM below the concrete.

    My shed is actually going to sit on 40x40mm plastic battens. On the battens will go some tonge and groove P5 egger protect chipboard for the floor. The walls will be stud walls lined with OSB on the inside.

    Even though no timber is going to be in contact with the concrete, I'd like to be safe so I'm considering draping something over the plastic battens before I put the chipboard down.

    I first thought of visqueen type dpm, but then I got concerned that any condensation forming on top of the visqueen would get the underside of the chipboard wet while at the same time cutting down airflow past the chipboard - basically creating exactly the problem I'm trying to avoid. So then I thought perhaps a breather membrane (like under slate roofs) turned upside down?

    What do you reckon?
     
  2. Sponsored Links
  3. Notch7

    Notch7

    Joined:
    15 Sep 2017
    Messages:
    25,354
    Thanks Received:
    1,790
    Location:
    S. Uplands
    Country:
    United Kingdom
    I would leave out any membrane for the reasons you mention.

    Your plastic battens are a damp break between concrete and floor joists.

    If you are building the whole shed, use vertical battens to create a cavity behind the cladding
     
    • Thanks Thanks x 1
  4. pedr0

    pedr0

    Joined:
    9 Jul 2008
    Messages:
    113
    Thanks Received:
    2
    Country:
    United Kingdom
    Yep building the whole shed. Going to make the stud walls out of 3x2 treated timber with OSB as the skin on the inside. No skin on the outside of the stud walls. Instead, I'll wrap breather membrane around the outside of the stud walls. Then I'll use vertical battens (like you say) to create an air gap between the breather membrane and the cladding. And then I'm cladding with feather edge fixed horizontally.

    I'm plannig to use just some 19x38mm treated tile/roofing battens for the vertical battens behind the cladding. Is that about right?
     
  5. 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

     
Loading...

Share This Page