French doors possible cold bridging. Replace or something else?

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Hi. We have a timber frame house that is brick skin on the bottom half and block and cladding on the top half. The windows are all set back in a recess assuming within the timber frame or the cavity.

We have 2 sets of French doors, one in the kitchen and one in the lounge and both are getting wet plaster where the sides meet the frame, do not think it is penetrating as it doesn't worsen in the rain but gets worse overnight in the cold.
These doors are flush with the outside of the house with parliament hinges swinging them 180 so they are in the brick skin.. the plaster must touch this brick skin and cold bridging is causing the damp.

We have been quoted to have the doors replaced but the company have pretty much said we'll replace but it might not fix your problem and have sent a diagram of cavity closers being used but in a standard brick house. I am waiting to see if they include replacing cavity closers if they are missing. We do not know, we have only had the house 5 years.

Are there any other things we can do bar ventilate a lot which we are already doing. Not got this issue on any other window or the front door.. all set back and not in the external skin.
 
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