Watford defender Adrian Mariappa made a sharp clearance after Loach had spilled a Taarabt free-kick, while Taarabt played a superb cut-back that picked out Faurlin, who had time to place his shot but wastefully drilled his effort over from 14 yards as the opening half ended goalless.
Wednesday gave themselves hope of a comeback just before half-time when full-back Spurr launched a huge throw-in from the left and Tudgay leapt highest to head past Loach.