Anyone had any experience of dealing with unexplained damp - not rising, not condensation,?

[intexasatthe moment]

How did you solve the problem ? What steps did you take to  identify the cause?

All advice gratefully received .

[Happyme5]

Is the damp on the walls, ceilings, flooring.  What is to your house made from?

[intexasatthe moment]

Ground floor flat. No cellar. Solid floors. Damp on walls (internal and external) and also floor. I.

[Penguin68]

Although the most common causes of damp tend to be (1) condensation or (2) leaking pipes or gutters etc there are also issues, including locally, of rising water tables. However the comprehensive nature of your problem does suggest that you might have a leaking water pipe entering the building (or worse a drainage pipe). That could account for damp on the floors and wall damp could be consequential condensation, as water evaporates from the floor and re-condenses on the walls. You need an expert. Thames water can check to see if there is a leak on the mains pipe running into the building, but if it is on your property they won't be responsible for repair (though sometimes they do repair this sort of problem).

[intexasatthe moment]

Penguin Thank you, that's very helpful. 

Process of elimination I think. Thames water to rule out one source I th

Edited July 5 by intexasatthe moment

[EDmummy]

We recently had a leaking pipe under concrete floor and it cost a bomb to fix. I hope they have home insurance!

[granadaland]

Sometimes a leaking waste pipe from a bath etc can cause damp walls.

Edited July 9 by granadaland

[KidKruger]

It’s amazing how often suspected damp is actually condensation, not diagnosing for you but supporting what I think has been said earlier.

If you get stuck try Peter Ward on youtube:

his vids helped me convert a 30yr rising damp problem into a condensation solution. Good luck!