Flaking slate patio
I have a client,with a 7 year old slate patio, that is flaking horribly. They said it was sealed after it was installed, but only then. I keep reading to clean the tile with a wire brush? If I were to clean these tiles with a wire brush, I'm not sure there would be any layers left. So my first question is how do I clean the surface properly before sealing the tiles?
This patio is at ground level, and borders with a yard, that has been graded to slope towards the patio. As well, no drainage in the patio and The patio is 1500sq/ft. There must be moisture under the concrete slab. My second question is what to seal the tile with?
I would love to be able to start over and install proper drainage and grade the yard properly, unfortunately these clients have been hit by the recession hard andvare trying to salvage all the renovation work they had done seven years ago during the huge Los Angeles housing boom.
Your advice is greatly appreciated