You only reposition mounting holes if the predrilled flange or hardware will not seat securely against the finished tile surface.

When a preexisting flange conflicts with a new tile layout assess the flange alignment relative to the finished wall plane and the tile thickness first. If the flange sits proud or gaps occur, measure the exact offset with a straight edge and a caliper or ruler to determine whether shimming, recessing the tile, or redrilling is required. If the flange hole pattern is structurally sound but misaligned, consider using anchor bolts with extension kits to span the gap while maintaining threaded engagement and load capacity; choose anchors rated for the wall substrate and match bolt length so threads engage by at least one inch. When redrilling, mark new hole centers with a template held in place, use a drill bit sized for the flange fasteners, and drill slowly to avoid cracking tile; if drilling through tile, use a carbide or diamond tipped bit with masking tape over the hole to reduce walk. If the flange can be moved slightly without compromising existing plumbing seals, reposition and secure with corrosion resistant screws and a nonhardening plumber friendly sealant to prevent future leaks. Always verify flange seating by applying firm hand pressure and checking for uniform contact across the perimeter before final torque of fasteners.

Common mistakes start with assuming the predrilled pattern must be used even when it causes gaps; the fix is to template and redrill or use extension anchors to restore secure seating. Another issue is drilling tile without proper bits or slow steady speed which chips the tile; the fix is to use the correct carbide or diamond bit, mask the tile, and keep consistent low speed with light pressure. A third problem is using anchors that are too short or unsuitable for the substrate which leads to loose mounting; choose anchors rated for the substrate and lengthen with extension kits so threads engage the structural backing.

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