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I have a log burning stove standing in the fireplace of a 1930's house where the chimney breast wall is only single brick thick. During the cold winter months only there is a problem with condensation/wetness forming on the inside surfaces of the chimney breast wall when the stove is not used and I think fitting external wall insulation on the outside of that area of chimney breast may solve the problem. Does anyone know where I can get the materials required and what would be best to use. The area to be insulated is less than 2 metres squared.

For this job you must use non combustable materials so it can be 50x50mm metal U channel profile with 50mm fiberglass insulation then fireproof plasterboard screwed to the profile
Or you can use thermalite blocks, which are ideal but will increase the chimney breast width by 200mm

Thanks for the advise but I need to insulate the outside of the wall ie on the outside of the house as there is insufficient room in the fireplace. I would be grateful for any further advise.

it would be pointless to insulate the outside of the breasting and costly.But if your getting moisture on the inside,You could spray a silicone sealant on the external brickwork to seal it.

Thanks for the advise.