Moira Niedzwiecka Posted October 29, 2017 Share Posted October 29, 2017 Please can anyone offer some advice on where the cavity tray should be fixed? External wall of the timber frame is OSB covered with membrane. We will then have a 50mm cavity before the external ironstone. Should the cavity tray be fixed behind the membrane and the membrane then overlapping the cavity tray so any moisture between the OSB & membrane is ducted outwards? Link to comment Share on other sites More sharing options...
Russell griffiths Posted October 29, 2017 Share Posted October 29, 2017 You've got it, imagine gravity pulling moisture downwards look at everything so it overlaps in a way that moisture will always have a pathway down and out. Link to comment Share on other sites More sharing options...
Moira Niedzwiecka Posted October 29, 2017 Author Share Posted October 29, 2017 Thanks Russell. I think I had answered my own question as soon as I had posted it. I am just wondering what is the best thing to use. A preformed cavity tray similar to the Manthorpe one or taping some DPC to the timber frame under the membrane. How would a plastic one be attached? Would that be taped to the frame so water couldn't get behind it, or with some other fixing? Link to comment Share on other sites More sharing options...
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