[Lauren]

Question: Extension wall has penetrating damp on the top half of wall - previously plastered twice and new flat roof fitted 7yrs ago - neither resolved the issue for very long. Would this require a builder and roofer, or just a builder? Previously builder wanted to plaster for 3rd time with plaster for swimming pools, but not sure if that would resolve the issue. Am I looking for the right trade?

[David1098]

You would need to c what is happening under the roof . It could be blocked cavity’s or cavity wall insulation gone wrong
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[Gareth Styles]

Hi - i would seek a damp proof expert for a report that way you won’t have trades guessing and waisting your money and they will pin point the issues

Cheers

​​​​​​​Gareth

[PetersHandyManServic]

Came cross that issue in past isue was actual lack of proper isolation. What builder done was for start using rubbish to fill cavity then 0 vents as last there was cracked overflow pipe going through cavity flooding it constantly. I would assume single core would give ansver to the issue