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In my 1930s house I would like to install some insulation backed plaster board to the external walls to add some warmth.
The walls have a cavity and there is no issues with damp.
I have seen a lot of people just foaming the back and laying the boards straight on to the brickwork or existing plaster.
My concern doing this is that, currently the internal skin is a warm wall, kept warm by the inside temperature. If water vapour from indoors travels through this wall it will then condense when it meets the cold exterior skin. Which isn’t an issue, but if I add insulation onto the internal skin, the internal skin then becomes the cold wall. If vapour travels past the insulation and touched the cold wall behind it the vapour will turn to condensation and will surely be trapped between the brickwork and insulation causing damp?
Has anyone had issues doing this before or could shed some light on why this wouldn’t be an issue?
The walls have a cavity and there is no issues with damp.
I have seen a lot of people just foaming the back and laying the boards straight on to the brickwork or existing plaster.
My concern doing this is that, currently the internal skin is a warm wall, kept warm by the inside temperature. If water vapour from indoors travels through this wall it will then condense when it meets the cold exterior skin. Which isn’t an issue, but if I add insulation onto the internal skin, the internal skin then becomes the cold wall. If vapour travels past the insulation and touched the cold wall behind it the vapour will turn to condensation and will surely be trapped between the brickwork and insulation causing damp?
Has anyone had issues doing this before or could shed some light on why this wouldn’t be an issue?