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We have damp in the screed under a bathroom due to an improperly installed shower tray that was leaking water as it drained away.

To get at the actual screed we would need to remove the tiles around the shower tray, remove the glass shower frame and then remove the shower tray - quite allot of work to do, remedy and reinstall.

We have been advised that we can remove the water / damp by using an industrial dehumidifier (something like THESE) pointed at the plaster walls surrounding the shower (these walls are also damp). The logic behind this is that as you dry these walls out the plaster in the walls will keep drawing the damp up from the screed, so eventually by continuity drying the walls you will remove all the damp from both the walls and screed.

Has any one come across this method before, and / or had results with it ?

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