I have two very large brick chimneys which are just framed with 2 X 4s and covered with plywood and then bricked. The gas log fireplaces just vent out the back so the chimneys are just for looks....my problem is that both are leaking from the top! The top is just filled with a thin layer of concrete on top of a plywood cover which is leaking down and into my house. About a year ago I had a roofer apply a layer of some type of thick liquid which dried to a grey hard cover but it has since cracked and is flaking off in large pieces allowing the water to again seep through the concrete top into the fake chimney and into the house. This house is only 3 years old. I am looking for some permanent fix to this problem. Do I need a roofing person or a concrete weatherproofing person? The chimneys are quite large, 41inches by 58 inches outside demensions. Thanks for any ideas or suggestions.