Damp Proofing Question

Damp patches on internal wall

Our external house wall is not open to the weather as it is covered by a carport. However for a fair while there has been a damp patch on the ground which has been coming and going - even in very dry weather. More recently the damp patch is not drying up. The damp patch is approx. a foot from the corner of the front corner of the external house wall and the damp then radiates out to the house wall. Where it meets the house wall, the bricks are starting to crumble and there are salt deposits above the blue bricks and this extends for a fair distance along the outside wall. We have dug up a small section by the house wall and expected to see sodden soil but not, although it is clearly damp soil. In the last couple of months we have had hall/stairs plaster skimmed ready for decoration and in the last few weeks we have had damp patches appear on the corner of the house wall in the hallway and even more worryingly 2 separate damp patches have appeared on the internal wall that separates the hall and lounge –this internal wall does not meet any outside wall. These patches are not drying up and one isgradually spreading along and upwards and is now affecting the plaster finish. I’ve had a so called damp expert round before the skimming was done who said there was no damp. I just think he didn’t want to get involved as we weren’t paying a survey fee. Does anyone have any ideas what’s happening? I’m worried that we have a water leak somewhere which may involve not only taking up the slabs in the carport but also the solid hall floor.

4 Answers

You will need to employ an independent damp surveyor to get a definitive answer to your problem.You will be charged for this service.You may also need to get a water supply pressure test done by your local water board.

Answered 24th Nov 2017

MJH Damp Surveyors

Member since 11 Sep 2017

There could be many reasons for this damp problem. Without visuals it would be pure guess work. may be best to get a proper paid for survey done for peace of mind.

Answered 24th Nov 2017


Member since 24 Nov 2017

No feedback

dampness can be created from many different sources without looking at the problems it impossible to say exactly what is happening,
your best bet is post the job on the site and get a local expert out to asses the cause/cost of a cure.

good luck Alex.

Answered 24th Nov 2017

ADR Property Maintenance

Member since 1 Mar 2009

Without viewing difficult to say but dry rot can travel through walls leaving salt deposits. Have a look on google for "dry rot on masonry images" and see if that helps. If you have had a damp meter reading showing no damp then this may well be the culprit. Incidentally damp meters are only a few pounds and easy to use and any reading below 22 is okay.

Answered 25th Nov 2017

All Things Property

Member since 14 Nov 2016

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