I messed up...any suggestions on fixing? Problem: I installed the Durock board over the tub flange without furring out the studs. It didn't occur to me until I was installing the tub surround but went ahead and installed the styrene tub surround. All fit ok except at the base (flange) area as a space now exist and movement on the base area causes the caulking to open up. Would it be possible to draw a carefully measured line just above the tub flange and use a 1/16 or 1/32 mason cutter to cut and remove the portion of the Durock to just above the the flange and screw the Durock to the studs? Please advise!