6 Vital Installation Process for Two Toilet Drains


6 Vital Installation Process for Two Toilet Drains


There is a vertical pipe which reaches from the toilet to your sewer. This is known as a soil stock which remains within the wall that can be accessed to waste line of 3-inch that comes from toilet. Mostly, houses have at least more than one bathroom and if both of them seem to be on same side, waste lines generally tie in the similar stack. Thus, if they have been on the opposite side, then each of them will have their own stack. As stacks should be vented, it actually means there has to be two openings of vent on the roof. Go through these 6 important steps to know how two toilet drains can be installed simultaneously with the help of experienced plumbers in London.

1. Select the right location for soil stack: In case you have one bathroom only in the house, then this will be within the wall which is directly behind it. However if you have two toilets, the right place for stack is just the halfway between them.

2. Build stack from ABS plastic pipe which is of 4-inch: You need to run through your house in vertical direction into crawl space or basement and then route horizontally to sewer line. This can either be hung from the floor joists or dig the channel for it. There is a line that connects stack with the sewer and this has to be in the downward slope of at least 1/4 inch for each foot.

3. Install a fitting: This should be installed where stacks change their direction from the vertical to the horizontal. After this, tie line within sewer by having appropriate cut inside sewer pipe with the help of a hacksaw and finally gluing with ABS cement in sanitary tee.

4. Fit closet flanges for both the toilets: This is sawing a hole in subfloor that has reciprocating saw by inserting flange and then twisting it to the floor. Use 3-inch flange when the distance between main stack and toilet is not more than 6 feet or else you can use a 4-inch flange.

5. Run ABS pipe from flange to main stack: This can be done with the help of a pipe that has same diameter like flange opening. Try to stick one end of the pipe with flanges by using 90-degree fitting known as a closet bend. You need to maintain downward inclination of 1/8 inch to 1/4 inch for each foot and then cut into waste stack where other end interconnects and attach with ABS cement.

6. Fasten a coupling at the top of waste stack: This need to extend a foot just above waste connection for decreasing the diameter from 4 to 2 inches. You may run 2-inch ABS from coupling through roof for venting the stack. Thus, this vent pipe will have to extend by 1 foot just above roof area. Make sure the opening of the roof has been sealed properly with vent flashing installation around exposed parts of vent pipe.

Essential things you require:

If you are looking for toilet plumbing services to install two toilet drains, then the following things will be needed:

  • ABS pipe of 4-inch
  • Clean-out fitting
  • Hacksaw
  • Reciprocating saw
  • 2-inch ABS pipe
  • 2 closet flanges
  • 3-inch ABS pipe
  • Sanitary tee of 4-by-4-inch
  • ABS cement
  • 2 closet bends
  • Sanitary tees that can either be 3-by-4-inch or 4-by-4-inch
  • ABS decreasing coupling of 4-by-2-inch
  • Vent flashing


Important tips to consider:

The method for waste line and stack installation might be different based on the pattern of your house and other orientations of toilets along with stack. Certain configurations need to have separate vents for waste line of toilet which may expand in the upward direction from waste lines and then attach with the main vent.

The plumbing code will have particular requirements for the waste, toilet drain or vent systems. You can prepare a chart of the installation to be done and get it checked from an accredited plumber before starting with the procedure. The plumbers at 4D Heating and Plumbing can identify improper configurations or code violations quickly. Make sure you secure essential permit from local plumbers before you may begin with the work.

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