Insulate top of cavity walls?

Discussion in 'Carpenters' Talk' started by Mike ST, Sep 14, 2021.

  1. Mike ST

    Mike ST New Member

    Hi folks,

    building a conservatory with block work cavity walls and bifolds. I’m putting a roof lantern on that’s the size of the floor, so will sit on the inner leaf. There’ll be a slim flat roof/gutter on top of the cavity wall (I’ve made it a bit wider for looks, so it’s about 400mm wide).

    I’ve got OSB on that’s flat on the roof/gutter at the moment, and am putting another layer of OSB with the correct falls on over that, which I’ll GRP.

    Do I need to put insulation or anything else in the void between the layers of OSB? Doesn’t feel like there’s a need for the top of a wall to be insulated given it doesn’t cover any of the actual room, but I’m not sure if leaving empty space is asking for problems with condensation etc.

    any thoughts???


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