DASH 8 COMMUTER SUFFERS ACFT DAMAGE AFTER WINGTIP STRIKE ON JETWAY IN RAMP OP ACFT PARKING PROC.

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AFTER LNDG AT IAD; WE WERE INSTRUCTED TO PARK AT A. WE ENTERED THE RAMP AT POINT KILO. AFTER ARR AT A; THE MARSHALLER SIGNALED FOR US TO DOUBLE BACK AND ENTER AT E. HE WAS TRYING TO TAXI US BTWN A PARKED ACFT AND ANOTHER ACR JETWAY. WHILE TAXIING VERY SLOWLY; THE MARSHALLER CONTINUED TO MOTION THE CAPT TOWARD THE R WING WALKER; WHICH WAS STANDING DIRECTLY UNDER THE R WINGTIP; WAS ALSO MOTIONED TO COME FORWARD. A SLOW L TURN WAS MOTIONED BY THE MARSHALLER FOLLOWED BY THE STOP SIGNAL WHICH WAS SIMULTANEOUSLY AND VERBALLY CONFIRMED BY THE FO (ME) WHILE WATCHING THE R WING WALKER ALL THE TIME. THE CAPT TAXIED AS HE WAS INSTRUCTED BY THE MARSHALLER. AFTER THE PAX DEPLANED; MAINT CAME ONBOARD. THE CAPT ASKED HIM HOW CLOSE TO THE JETWAY ARE WE? HE RESPONDED THAT THE AILERON HIT THE JETWAY. WE WERE ALSO INFORMED BY MAINT THAT THIS WAS AT LEAST THE 4TH OR 5TH TIME THIS HAS HAPPENED AT XYZ AIRLINES IN THE PAST 3 MONTHS; THAT PLANES HAVE TAXIED INTO OBJECTS. THE MAIN PROB IS TRYING TO FIT WAY TOO MANY AIRPLANES INTO TOO SMALL OF AN AREA AT IAD. PLUS THE WING WALKER DIDN'T HAVE THE CORRECT TRAINING TO BE PUT IN THAT POS. (IT WAS HIS 1ST DAY ON LINE.) SUPPLEMENTAL INFO FROM ACN 268689: WHEN WE ARRIVED AT THE SAME GATES THE NEXT MORNING WE NOTED THAT ALL THE JETWAYS BTWN A AND E WERE RAISED WING ENOUGH TO CLR THE WINGS OF THE 'DASH 8' ACFT WHICH ARE PARKED THERE.