The slate treads on my brick porch came loose, and I found that most of the mortar underneath has deteriorated. I took the 2" treads off, and cleaned off the 3/4" old mortar and the brick surfaces. Now that I'm ready to reset the treads, I'm wondering if anyone can advise of an appropriate procedure. Should I just use 3/4 to 1" of mortar (like Quikrete type M), or build forms around the brick risers to this depth first? Should I butter the treads, and if so, with what?
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