I have a tiled shower in the lower level of my house. All of the work was done by a previous owner. After about a year of use I noticed the drywall at the bottom corners of the entrance to the shower was water damaged. After digging into it I found that some water had gotten under the floor. I then pulled up the floor, cut out the damaged Sheetrock and ran a dehumidifier to dry everything out. Once everything was dried out I repaired the drywall and installed a shower door. Previously, there was a shower curtain in place. I had assumed that water was either seeping through or getting around the curtain and that was the issue. With the shower door in place I began using it again with no flooring in place, just the concrete subfloor. I used it for approximately three weeks and didn’t notice any moisture on the concrete subfloor. I recently put down a vinyl plank floor but have not put trim in place. The floor has been in place for about a week now and today I noticed that the concrete appeared damp on either side of the entrance. It appears the problem has persisted but I don’t know where or how the water is getting out. I have no idea how the shower was waterproofed or generally constructed, I had the shower door professionally installed by a reputable company. Can anyone please point me in a direction to address this?!?