I recently started having a lot of moisture in room next to my bathroom/shower wall. Its important to add that these walls are made of plaster.
Initially I thought it was the silicone than joins the shower with the wall that was letting water pass. The shower base started separating from the silicone.
I put new silicone but there is still moisture in the room. It's not a perfect job but it should be enough to keep water out. Or at least prevent that level of moisture.
I am now starting to think that the tiles joints may let water pass. These are 3 mm joints with bitumen.
My question is: what can I do? is it possible that the joints let moisture pass? Can I do something to isolate better the area with silicone? Is there something I can put on the joints? Any other tips?