Tile backer board screw pattern check before waterproofing

A bathroom remodel looked ready for waterproofing, but the backer board had inconsistent screws and one seam was not bedded correctly. If we had rolled membrane over it, the surface would have looked finished while the substrate was still wrong. My check is now done before any liquid waterproofing comes out. I verify the board type matches the wet-area spec, then check fastener spacing against…