Hi I am having a new front door fitted but the design of the door does not lend itself to having a letter plate in it . The options are fix a letter box on the wall outside or my preferred option is put a letter plate on the wall with a sleeve going through a cavity wall . That way my post will be inside . I am a little concerned with cold bridging ( cold air meeting warm air and forming condensation ) has anybody had any experience in this area ? I was going the build a box on the inside and insulate it . Many thanks
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