On Floor Trap and Floor Waste

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When examining the discharge outlets in toilet and shower areas, we may come across 2 different types of floor discharge symbols - FT for floor trap and FW for floor waste

Floor Trap

  • Has a grating to catch the first layer of dirt and debris
  • Has a "trap", like a S or P bend, that traps dirt and debris before getting connected to a sanitary stack
  • Requires deeper depth for this bend, usually below the soffit of the slab
  • Usually for dirtier regions


Floor Waste

  • Has a grating to catch the first layer of dirt and debris
  • Does not have a trap right underneath it, and may connect directly to the sanitary stack
  • Requires less depth since there is not bend, and can sometimes be embedded in a floor slab directly
  • Usually for showers and other areas with less debris
  • Needs to be connected to a floor trap eventually; usually, only up to 2 floor wastes are connected to 1 floor trap

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