Drying out damp before painting

[Sef1928172]

I have a spot of damp on a wall between kitchen and bathroom which was causing paint to peel off. I have scraped off the paint and am letting the plaster dry out (have put a dehumidifier in front and the plaster has visually lightened in colour a bit so hoping that it will dry out completely). See the picture attached

My assumption is that the cause of the damp is condensation from the kitchen/bathroom climate.

What would be the best approach/types of paint, or other damp proofing products for repainting this area once dried out, to hopefully avoid the issue returning?

Many thanks for any advice

 

[HERTS P&D]

What is on the other side of the wall? Post a picture.

Andy

 

[Sef1928172]

The other side is just tiled wall next to heated towel rail.

The kitchen floor is tiled concrete so not sure if it would be rising damp.
Thanks

 

[HERTS P&D]

Ok, I thought it might be a shower on that wall that was leaking.

Andy

 

[JohnD]

the wet patch in your picture is typical of a plumbing leak.

Is it a concrete floor?

Does the washing machine leak?

 

[JohnD]

What would be the best approach/types of paint, or other damp proofing products for repainting this area once dried out, to hopefully avoid the issue returning?

none.

mend the leak.

 

[HERTS P&D]

Check the washing machine connection on the valve and at the back of the machine.

Andy

 

[Sef1928172]

the wet patch in your picture is typical of a plumbing leak.

Is it a concrete floor?

Does the washing machine leak?

yes it is a concrete floor. The surveyor though it would have been poured directly onto the ground

I have checked around the washing machine and can’t see any sign of a leak but will keep an eye in it next time we do a load.

For additional context, there is also paint flaking in the other side of the door, and above, which led me to assume humidity/condensation was the culprit.

 

[JohnD]

Is there a pipe buried in the floor (or wall)?

 

[Sef1928172]

I don’t think so but can’t be certain without making a hole to investigate. The heating pipes are all external (in the bathroom) and don’t leak.

The only possibility I can think might be the drainage from the bathroom. I don’t think it runs directly under there though.

 

[Sef1928172]

Having had the plaster exposed for a while now, I have now noticed small crystals forming in the surface. Is this a sign of anything in particular?

if I hack off the plaster to try to locate pipes (would they be buried within the plaster??), is there any type of plaster patching product to use as a patch up diy job to re cover before painting?

thanks again if anyone has any further advice.