Just about finished with my pompeii oven. Built a block enclosure around the oven covered with slate tiles. For the roof I poured a 3 inch slab on top covered with epoxy paint. Druing the last rain storm the floor became wet. Water probably went down the sides of the chimney which was not caulked in time for the storm. I can't seem to get it dry. I have left a fan running 24/7for 10 days and have had numerous fires and it is still damp. You can even see steam rising from the floor bricks as the fire heats up. Even with a large fire the floor temp only goes up to 200 degrees or so when the top of the dome can be 700-900 dgrees. it only seems that the floor bricks are damp not the wall bricks. I worry that the insulation board under the floor is also wet and may just never dry. Any suggestions?