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Taper Flat Roof System with Poor Water Management in Knoxville. Upon inspection of this cantilevered concrete and flat membrane awning, I discovered that the taper is incorrect, and the front curb is not tall enough for sufficient splash guard and overtopping prevention. This is a fairly unusual shape, and size and a diamond pattern are recommended for maximum water management, along with a built-up curb at the front to act as a splash guard and prevent water from overtopping when filling rapidly. The customer is recommended to hire someone to install an underground drain pipe in front of the building at the flower bed to lower grade.

Ponding and Overtopping Water Problems

  1. 1
    Bad TPO seam welds with buildup

    Build up at the edge of a welded seam on a TPO roof membrane is a sure sign of bad welding. These will quickly turn into leaks if not immediately
    The build-up at the edge of a welded seam on a TPO roof membrane is a sure sign of bad welding. These will quickly turn into leaks if not leaking at the very first rain. 

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  2. 2
    Ponding water over entryway

    Here, you can see that water sits in this area with no hope of draining. The site is shaded and low, pitched improperly. Taper corrections and built-up curb is recommended as well as adding drainage.Ponding water and low curb make for bad conditions for over topping the edge of the roof

    Ponding water and low curb make for bad conditions for overtopping the roof's edge.

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  3. 3
    Insufficient taper

    If tapered properly and with a built-up curb, we can channel the water to both ends and into a scupper drain attached to a downspout. Recommended that drain pipe is added to this system to a lower gradeWith a higher curb and proper tapering, the water can be directed to this back corner and through a scupper drain into a downspout. It is recommended that the customer install drain pipe from downspout to lift end of the building at a lower grade

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