Plumbers Picks Toilets Part 1: Toilet Rough In and Flushing System

When choosing a proper toilet there are several factors that must be considered. Unfortunately, not much attention is given to toilets until they need to be fixed or replaced. The toilet’s rough in and flushing system are two important factors to consider when choosing a toilet. The professionals at Ray May Plumbing, are ready to help you make the right choice.

In this first part of a multi-part series we address the rough in and the flushing system of toilets.

The Toilet Rough In

  • Rough in refers to the distance from the wall behind the water closet to where it bolts to the closet flange on the floor.
  • This measurement is obtained by measuring the distance from the wall, not the baseboard, behind your toilet to the bolt caps of the current toilet.
  • The standard measurement is 12". There are also 10" and 14" but these are less common.
  • It is important to have this information to make sure that your new toilet fits in the preexisting space.

3 Types of Toilet Flushing Systems

  • Gravity-fed

    • The gravity-fed flush occurs in flapper or canister type flush valves. When the trip lever is depressed, the flapper or canister lifts, allowing the water to drain from the tank into the bowl. At the same time, a vacuum seal is broken, causing the water in the bowl to evacuate into the waste piping.
  • Pressure Assisted

    • Pressure Assisted toilets use a sealed, pressurized bladder that allows pressure from compressed air to force the water from the bowl down the waste pipe.
    • Tend to generate a stronger flush than the gravity fed toilets.
    • The drawback, to pressure assisted toilets, is the noise. Pressure assisted toilets create more noise than their counterparts.
    • The solution to the noise created by a pressure assisted flush would be a 3" flush valve.
      • An industry standard for the opening between the tank and bowl is 2".
      • Many toilet manufacturers offer a 3" flush valve, which increases the opening by 1".
      • This in turn makes the toilet flush more thoroughly without the loud sound made by pressure-assisted toilets.
  • Dual Flushing System

    • For those wishing to conserve water, a dual flushing system would be beneficial.
    • These toilets have two buttons on the top each flushing a separate amount of water.
    • One button flushes a smaller amount of water for liquid waste; and, the other flushes a larger amount of water for solid waste.

We welcome you to visit our showroom located in Montclair to check out what we have to help you with your plumbing needs. 

Check back soon for more plumbing information. Thanks!

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