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Generous of you to assume I can make it tight enough to trap moisture. If I did it, I'll probably cut some channels into the bottom section of framing.
@NickCJ yes probably, curtain like that will get filthy at the moment though, and I already have most the materials needed. The door will be replaced in spring once I have the money to do that. But just want something to reduce heat over winter.
Someone tell me why framing the back of ledge and bracer door, and then putting pir insulation in and capping with 3mm ply is a stupid idea please.