Following on from my previous post, we have now taken up the shower tray and removed the plaster on which the tiles were mounted. The causes of the dampness and leaks from the shower installation are becoming increasingly evident, including today's discovery, shown in the photo, of the shower tray mounted on blobs of adhesive and some rubble rather than a solid base.
It might be tricky to see from the photo, but the ply upon which the tray was mounted runs under the floor tiles (beneath my feet in the image) rather than being a separate section. Given the rest of the job, I suspect it may not be marine ply. It's a bit springy, so there are likely no noggins to support it. I suppose I need to remove it to install a marine ply platform for the shower tray that is solid. How would you suggest I do this? I have considered cutting through the ply directly adjacent to the floor tiles, with a circular saw, but I don't want to cause more problems.
It might be tricky to see from the photo, but the ply upon which the tray was mounted runs under the floor tiles (beneath my feet in the image) rather than being a separate section. Given the rest of the job, I suspect it may not be marine ply. It's a bit springy, so there are likely no noggins to support it. I suppose I need to remove it to install a marine ply platform for the shower tray that is solid. How would you suggest I do this? I have considered cutting through the ply directly adjacent to the floor tiles, with a circular saw, but I don't want to cause more problems.