Q. After my roof was redone, the roofer suggested covering the chimney flues with a chimney cap. How can I tell how many flues I have, and how can they be covered with a cap?
V.D. from Belmont
A. What the roofer meant was flue liners, hollow clay blocks that make up the lining of one flue. You can determine how many are in your chimney by looking at the top of the chimney to see how many liners are sticking up. As for chimney caps, there are two kinds, one is a concrete cover on the chimney, sloped to allow rainwater to drain. The other chimney cap is a stainless steel cage type cover with a solid roof on top. Full story for BostonGlobe.com subscribers.