External, cold North facing walls wet

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BigAL808

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We have a 1905 Victorian End Terrace.
Walls are 9 inch brick, plastered on brick inside and unfortunately painted on outside 20 years ago. Probably not sealed very well at all.

If window is open quite a bit the cold external bedroom walls (North facing) will be dry.

If closed the walls get ringing wet with condensation.

Only the corners and about two feet left and right top to bottom are wet behind a chest of drawers and above.

Much of the plaster on these walls is dry.

What is the likely reason for this wet corner being so damp?

Should we chop these two walls back to brick, seal the walls and then add two layers of thermal plasterboard?

Or should we start by installing a 1st floor level modern air brick vent behind the chest of drawers and also seal and repaint the walls outside with a really good quality water repellent and weathershield paint?

Thanks in advance....
 
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no
Insulate and render it externally and finish with a Silicone texture not acrylic just because it cheaper , add air bricks to each external wall and trickle vents on your windows. Jobs a cracker
 
no
Insulate and render it externally and finish with a Silicone texture not acrylic just because it cheaper , add air bricks to each external wall and trickle vents on your windows. Jobs a cracker
Best tell him ,overhang on gable & parapet will
Need Alterations of sorts for tHat ....
 
Op ....sort that parapet coping & pointing ...
Buy yourself a humidity reader first ......
 
Go with Mucky's advice. That's a big old wall to face north. You will need to extend the coping and roofing to cover the extra width but that's not a biggie.
One alternative to render over the insulation might be cladding in one of the plastic/cement/metal finishes available now. Not cheap but might improve the looks and saleability/value.
You might be able to get a grant to help with the cost, and an environmental survey to back up what you already know - that it's the biggest heat loss in the property.
 
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