No, ledge wall is not necessary for wall hung WC. if in toilet back side column is exist then drain pipe & flush pipe line cancel then put up the ledge wall
Any building design top to bottom and column design depend upon on load like column beam slab ( DD LL WN ) and also depends on types of building like residential, commercial and conditions (gm,garden etc.) And location
So don't suggest wrong if u clear then u suggest because half knowledge is...
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