Flagstone: what to use, sand, cement, or gravel?
— A gravel base will definitely move a bit—looking at any of my patios, you'd never know that, but the movement does happen. Cement is rigid—if you put a rigid top on a flexible base then systemic cracking is inevitable. Cement based mortar is a fine joint filling material if the flagstone happens to rest upon a concrete foundation. But why ...
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