Ask Todd Miller *Metal Roofing Expert

#33 – Chimneys and Metal Roofing

Written by Todd Miller on April 26, 2017 | Filed under: Metal Roofing 101 Series, Roofing Help Videos

One of the positive benefits of a properly installed metal roof is that it will be flashed in order to be watertight against roof penetrations such as chimneys, skylights, and dormers. Shorter term roofing systems are often just sealed in those areas, with the assumption that the sealant will last as long as the roofing material. A different approach must be taken with a long term metal roof though and that approach includes careful flashing against various penetrations and protrusions in the roof. Over the years, I have seen many cases where folks starting getting water infiltration around their chimney. They often assume the problem is the intersection of the chimney to the roof because, with other products, those sealants fail over time. With a properly flashed metal roof, though, rarely is the problem with the flashing. Usually the problem is due to deterioration of the masonry chimney or the chimney cap. One thing to look for is whether the leak is through the ceiling in the home or if the water seems to be traveling down or through the brick fireplace. If the water is showing up in the ceiling, it may very well be a flashing issue. If it’s tracking down the face of the fireplace, though, it likely is a masonry issue. As a safeguard, I always suggest having chimneys inspected and repaired prior to roof replacement.

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About Todd

Todd's expertise comes from his years of experience in metal roofing manufacturing. As president of Isaiah Industries, based in Piqua Ohio, Todd runs a several of the world’s leading manufacturers of residential metal roofing; Classic Metal Roofing Systems, Kassel & Irons, and Green American Home. His personal goal is to educate homeowners of the long-life benefits of metal roofing.

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