A C182 PILOT TAXIED DOWN A ROADWAY AT BFI AND STRUCK A FENCE.

Narrative

I WAS CLRED TO TAXI BY BFI GND CTL TO TXWY B7. HAVING CHKED ATIS AND DUE TO THE TXWY CONSTRUCTION THAT WAS UNDERWAY; I UNDERSTOOD THAT B6 WAS CLOSED; WHICH MY ONLY SAFE RTE WAS TO USE THE VEHICLE ACCESS ROAD THAT IS BORDERED BY CYCLONE FENCE ON THE R. I FELT THERE WAS MORE THAN ENOUGH ROOM TO TAXI SAFELY IF I STAYED TO THE L EDGE OF THE PAVEMENT. WHAT I DID NOT KNOW; WAS THAT THE PAVEMENT MADE A GRADUAL TAPER THAT MOVED MY ACFT CLOSER TO THE FENCE AND MADE CONTACT WITH THE R WINGTIP. UPON CONTACT WITH THE FENCE; THE ACFT SWUNG TO THE R AND THE PROP STRUCK THE FENCE. I HAD PULLED THE MIXTURE OFF BEFORE IMPACT; BUT PROP WAS STILL WINDMILLING. THERE WERE 2 PEOPLE ON BOARD -- 1 PAX AND MYSELF. THERE WERE NO INJURIES. DAMAGE TO THE ACFT WAS R PLASTIC WINGTIP TRIM; 1 BLADE OF THE PROP AND SOME DAMAGE TO PROP HUB. THE CYCLONE FENCE WAS PUSHED IN A LITTLE WHERE THE PROP STRUCK BUT WAS NOT BROKEN. WHEN I WENT BACK TO TAKE PHOTOS; I HAD A HARD TIME FINDING IMPACT AREA. AFTER OVER 40 YRS OF FLYING AND OVER 3500 HRS; I HAVE NEVER EVEN PUT A SCRATCH ON AN ACFT. I WOULD SUGGEST THAT VEHICLE ROADWAYS BE MARKED WITH 'NO TAXI AREA' IF THEY ARE NOT TO BE USED AND DON'T ASSUME ANYTHING.