Green roof help, which waterproof membrane to go round a opening/tree

Discussion in 'Eco Talk' started by Dougie Bray, Jun 29, 2020.

  1. Dougie Bray

    Dougie Bray New Member

    Hi all,

    Building a summerhouse with a veranda that goes round a tree(not touching the tree) with a green roof. I’m looking for help with which waterproof membrane to go for? Seems like liquid rubber would be easiest to paint on but would the joints need taped? other option is loose fit pond liner EPDM/Butyl.

    structure is heavy duty timber with OSB roof.
  2. wiggy

    wiggy Screwfix Select

    I use lorry inner tubes as a flashing when going around trees.
    Cut the tube along the outside seam and then cut it in half. That leaves you with the right shape.
  3. Bob Rathbone

    Bob Rathbone Screwfix Select

    The inner tube will perish due to the UV from the sun. Would be OK with another material over it to protect it from the sun. How will you stop the rain running down the tree trunk?
  4. Dougie Bray

    Dougie Bray New Member

    I should have been more clear, the tree goes through the veranda part of the roof so it doesn’t need to stop the water going down the truck.

    I’m just looking for the most economical option for the membrane as it goes around square open where the tree is.

    liquid Rubber would be good but if you have to use tape for all the OSB joints it gets expensive. EPDM/Butyl would need jointing some how.

    was hoping some one would have experience in this?

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