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Thread: Outdoor patio sump with decorative grate

  1. #1
    DIY Junior Member svierregger's Avatar
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    Default Outdoor patio sump with decorative grate

    Hi - we made the mistake of installing a French drain (36"x36x"x36" gravel filled pit) under our 600sf slab/mortared flagstone semi-covered patio. The patio is a walk out from the basement, but is actually about 20" below grade (two steps up onto adjacent pool deck). The existing French drain has a 6" decorative brass grate. Over the years silt/runoff has clogged the French drain gravel pit and the drain backs up easily, making a swimming pool of the patio. With the small grate it is impossible to clean out the silt so we are resigned to opening the pit and installing a sump pump. We would like to be able to hose off the patio and not have to worry about overflow anymore, and we don't want to have to worry about flooding every time we get a big storm.

    I have a couple of questions about the sump installation. I would like to use a standard sized pump basin, but I would like to minimize the grate size. That particular area of the patio (the designed low spot), we don't have room for a full size grate. I would like to use the smallest grate I can get away with and still be able to perform pump maintenance. Also, the grate must be decorative metal (bronze, etc) because the patio is a full stone job and the grate needs to "blend" in as much as possible. Any recommendations on fabricating a decorative grate on top of a standard basin?

    My other question has to do with the pump selection. Much of our winter is near/above freezing, but we do get cold snaps. We occasionally have single-digit weather. Will the outdoor usage/cold potential affect my pump selection? Our pool pumps have thermostats that automatically run them below 35 degrees to keep from freezing. I'm not sure if this should apply to outdoor sumps as well. I want the best pump for the job from a performance/reliability standpoint.

    Do my requirements sound reasonable? I haven't seen much in the way of decorative sump grates that provide a narrower opening over a standard basin. And I haven't found much information on outdoor sump pump usage.

    Thanks for any advice you can provide.

    Regards,
    Scott

  2. #2
    Moderator & Master Plumber hj's Avatar
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    Default

    1. you would need a grate large enough to remove the pump, (usually almost the same size as the pump's basin), which limits your options immensely, especially when it comes to the materials they are made of.
    2. You would quickly damage the seals on the pump if you turned it on during a freeze but there was no water in the pit for it to pump out.
    Licensed residential and commercial plumber

  3. #3
    DIY Junior Member Nissen's Avatar
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    Default Decorative stone

    HI

    I have an idea for the the area sourrounding the pool; I put som decorative stones around my pool last year- and it looks stunning.

    Best, Nissen

  4. #4
    Moderator & Master Plumber hj's Avatar
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    This is a "drain" opening in the "center" of the pool deck area.
    Licensed residential and commercial plumber

  5. #5
    DIY Junior Member Nissen's Avatar
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    Lightbulb decorative stones 2

    In fact, I saw some beautiful Mocha Maryland Shore Stones , I saw them at http://www.gravelshop.com

    Good Luck

    Nissen

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