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Roofing

Damp on new veranda roof

Anonymous user 28/02/2024 - 3.13 PM

Hi 5 months ago I had an open veranda built on the side of my house. This is now suffering badly from black damp on the inside ply, not just in the corners but coming everywhere. The builders have said its condensation and although It is wood stained I need to pay for a sealant to be painted on to stop it coming through. I have another veranda on the other side of the house that has been there for over 10 years (before my time in the house) and there are no damp patches anywhere. Could you please let me know what is making the damp come though, who needs to put it right (me or the builders) and what needs to be done to put it right correctly? Incidentally, I still have off cuts of the ply that was used in my garage and that is completely black with damp now! Hope someone can advise me, thank you.

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2 Answers

T Davies & Son Roofing

Rating: 5 out of 5

Middlesbrough

It sounds to me like the boards where wet prior to installation (builders fault). Once the new roof has been installed on top of the boards, the boards are now unable to 'breathe' this meaning the moisture is trying to escape but has nowhere to go as its trapped under the new membrane. (if this makes sense) If green mineral has been used, you may find that the corners of the flat roof will start lifting? This is down to the moisture trying to escape. I obviously haven't seen the job, maybe some sort of vent will help this problem? It does sound like the blame would lie with the builder. Good luck, I hope i've helped somewhat.

Answered11 May 2015

A&J Surveyors Ltd

Rating: 5 out of 5

Newent

It sound like the materials used were wet and are still trying to dry out this causing condensation and mould. It could also be agrevated by 'poor construction (lack of using the correct type and thickness of insulation' in accordance with good building practice and building regs.. Regards Andrew @ Fibretechs - Gloucestershire

Answered14 May 2015