Coping

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    Marquis Nichol

    I read that also in FBC. I think some masonry coping is considered better because of it's ability to perform well over time. Metal can deform and oil-can due to temperature fluctuation and can create ponding and negate the positive slope for draining. Some metal corrodes and rusts from moisture, has movement from wind, and joints can separate and connection methods can fail. Masonry isn't bullet-proof but it seems to be a better alternative to metal if the right masonry type is used and the installation is done correctly. However, the cost is most likely higher, unless you start getting into better metal types or thicker gauges that are more resistant to those issues. In either case, wrapping over the parapet with a barrier or membrane under the coping is beneficial if the coping fails.

    https://roofonline.com/coping

    https://roofonline.com/types-of-wall-coping

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