Q&A for How to Flash a Chimney

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  • Question
    Can you measure and cut the sheet metal yourself or does it have to be ordered?
    Community Answer
    You can cut it yourself.
  • Question
    What side does the bigger piece of flashing metal go on?
    Community Answer
    For a chimney or skylight saddle, the larger piece goes at the top. It goes beneath the upper courses of roofing material, and overlaps the side or step-flashings.
  • Question
    How many inches of flashing should there be at the bottom, lying against the roof, on all four sides?
    Community Answer
    For a skylight or chimney on a composition roof, there should be 6 inches on bottom and sides, 9 to 12 inches on top.
  • Question
    I had my metal roof replaced about 2 years ago. It is now leaking pretty badly around the chimney. There is no saddle on the back. Do you feel that is something the contractor should be responsible for fixing?
    Community Answer
    Since it was two years ago, it is likely that the contractor is not liable nor responsible to fix it for free. For home improvement projects, contracts typically have some sort of warranty period, this period is typically at most only good for one year. Check your contract and call them up to find out more. In some cases, if the product is faulty, the warranty may be longer.
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