Trusses are engineered and built as a system.....making changes to them takes engineering.........information certainly not available on the internet......
....1" floor on 24" centers won't support your choice of tile.....You need to visit the John Bridge Tile Forum
.....DON'T cut away any more damaged flooring than necessary......support any repair joints over the existing trusses......the plywood floor will be glued to the truss making removal difficult
......Since the drains are PVC any necessary repairs or height alterations are "easily" made by you or a plumber
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