PLEASE help...had curbless drain installed now shower floods

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by rdm2370, Nov 10, 2016.

  1. rdm2370

    rdm2370 New Member

    Joined:
    Nov 10, 2016
    Location:
    Illinois
    MY shower pan is 50x45...The drain in a linear drain that is 28" Long x 2.75 Wide" with a 2" outlet...My shower is a Grohtherm 3/4 with 3 outlets I will paste the specs below.. If I turn on the shower all the way it will start to overflow, if I turn on the shower head and rain shower I will have a real problem...my question is...does anyone know the proper drain size for the amount of flow my shower produces (see specs below). It seems like the drain capacity is too small but I can't find it in writing anywhere...The contractor is saying it is a standard drain but I am having a hard time believing him...

    Grohtherm
    3/4" Thermostat Rough-In Valve

    • Compact cartridge with wax thermoelement
    • Built-in non-return valve with dirt strainer
    • Built-in service stops
    • Integrated stop valves
    • ¾“ NPT female thread
    • Back-to-back installation by reversing the cartridge
    • Temperature control only, outlets can only be used
    with separate stop valves
    • Max Flow Rate 16 gpm at 45 psi
    • Requires Twin Ell For Shower/Tub Combinations with Diverter spout (not included)
    • MEETS ASSE STANDARD 1016
    • 34 331 – 9 gpm at 45 PSI (½" Valve)
     
  2. Smooky

    Smooky In the Trades

    Joined:
    Apr 4, 2011
    Location:
    North Carolina
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