Amatuers aren't able to figure out what freeze-thaw cycles do to cheap materials and shoddy installation methods. "Cement boards expand....." Gee, no kidding! LMAO!

BTW, it's "steel reinforced mortar bed," and it ain't "stone," it's poured concrete. If it were stone, it wouldn't need a warranty. It's the contractor, not the materials. LOL!