Q. I have a brick chimney built thirty years ago. When there are high south-easterly winds, accompanied by heavy rain, I get a lot of water in my basement through the chimney clean-out doors. I tried covering the two flue tops temporarily, but it didn’t make any difference. I tried treating the chimney with a sealer, but that didn’t help either, it still leaks like a sieve. My main frustration is that no one seems to be able to tell …