Q: Whenever I need to replace chimney counterflashings, I seal the top of the flashing with Quickcrete, using a caulk gun. This product is made for concrete repairs, and comes in a tube. I know that some people will mix up a little mortar for this job, and others use silicone or urethane caulk. What is the best product to use?
Valley flashing takes a beating, whether from heavy rain runoff or melting snow and ice. A long-time roofing contractor explains the proper way to waterproof, flash, and shingle a durable valley.