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Bi-Fold Threshold Around Extension and Channel Gulley

Postby AshCreights » Thu Nov 14, 2019 3:08 pm

I am carrying out an extension, is it best to install a channel gulley around the extension, as I am having bi-folds both sides and am going to have the patio virtually flush to the doors both sides, also would it be good practice to install a second DPM 150mm above this level.
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