insulate basement ceiling on outside porch

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HI EVERYONE,I JUST TOOK DOWN SOME OLD drywall & INSULATION FROM THE CEILING IN ONE OF MY ROOMS IN MY BASEMENT.THIS ROCK & INSULATION WAS VERY WET.THE WALLS ARE BLOCK,2X10JOIST W/CORRUGATED TIN & 4"CONCRETE FOR THE FLOOR OF THE OUTSIDE PORCH.THE PORCH HAS A ROOF OVER IT SO IT WON'T GET WET.THE CONCRETE FLOOR OF THE PORCH IS ABOVE GRADE ABOUT 2-3 FEET..AFTER PUTTING A FAN IN THE ROOM FOR A FEW DAYS DRYING THE JOIST & TIN OUT,I PULLED OUT THE FAN & ABOUT 1WK LATER I WENT BACK & SAW THE TIN COVER W/ WATER (LIKE IT WAS RAINING IN THERE).THE BASEMENT DOES HAVE A WOOD BURNING STOVE FOR HEAT & IS PRETTY DRY ,BUT FOR THIS CEILING MOISTURE PROBLEM.MY QUESTION IS HOW DO I FIX THIS PROBLEM SO I CAN FINISH OFF THE CEILING..