I tore down the old tile in the kitchen, and behind it, there was Masonite on the left half and a chimney behind the right half. Unfortunately, they are not on the same level; there's a 1cm difference between the Masonite and the chimney.
How can I bring the chimney side out by 1cm?
Can I use sand putty?
I'm going to retile where the old ones were.
