Can anyone recommend: Rising damp!

This is a common problem in Spanish properties. I have this issue in my place. They do not build with a damp course. From my point of view the only real solution, long term, is to "tank" the walls. This is something I have done many times in the UK where the damp proof course has failed.

It involves going back to brick, then repaint using a tanking slurry, which creates a water impermeable layer, then re plaster with plasterers sand and a cement. I don't know anyone who offers this over here.

The final result is totally reliant on the brickwork under the plaster. I have seen some simply shocking brick work which would even prevent this from working without substancial rectification.

Very labour intensive so it's very expensive.

A cheaper but less reliable method could be to repaint with an aqua stop product before putting a top coat of your required finish.

Running a properly sized dehumidifier 24/7 with a constant drain will certainly help control the problem (I do this at my place when I'm back in the UK as I'm not prepared to put the time and money into tanking the place). The aim would be to get the humidity levels down to 40% or less. It may be you need to hire a larger professional dehumidifier for a few weeks running that to bring down the humidity levels initially.

Don't fall for the damp proof injection course con. It may work for a short time but it will fail.

hi, not sure about rising damp but we rent a house and they covered up the walls with fresh paint when we moved in, but after the first rains the bedrooms were covered in mould, ceiling and top of the walls, we had just moved in and had stuff all over the place and didnt want a load of workmen in although we would have got the landlord to deal with it. a mate of mine told me to brush the walls down, then cover the mould with bleach, strong bleach so i used good old domestos, and really cover the mould, let it dry and do it again, another good dousing, then once its properly dry paint over it, and i have to say its been ok now for 2 years, no sign of mould coming back, but you must be careful, wear gloves, goggles and a good mask its not a pleasant job but it worked for us, just do a room at a time so you can keep out of it until properly dry and the smell has gone, dont sleep in the room until its dry.

You need to identify if there is a damp-proof membrane fitted under the floors usually a thick plastic sheet on which the concrete is laid on.The outside walls I asume the level of the outside floor is lower than the inside floor by at least 150mm 6 inches.  to prevent damp passing in to your building .