How to Install a Toilet: 8 Tips to Replace Old Toilet

Whether you want to install a toilet (new) or replace an old toilet, here is the perfect guide for you.

If your toilet has developed cracks or leaks and uses too much water every flush, it’s time to replace it. You would think now is the time to contact the plumber, but it can all be done in a day by yourself. Toilets are heavy, but if you can lift two sacs of grain, then you may save money by installing them yourself.

It’s not as difficult as it sounds to replace and install a new toilet. All you need are a few hours, a helper, and the necessary equipment and toilet components. Before you begin learning how to install a toilet, select your new toilet. If you are not replacing an existing toilet, ensure that you have plumbing available for the new installation.

Read this article for step-by-step directions on how to replace and install a toilet.

How to Install a Toilet: Step-by-step Guide

1. Remove the old toilet that has to be replaced

If you’re going to install a toilet, you must first remove the old one. Here’s a quick rundown on how to replace an existing toilet:

  • Turn off the water at the shut-off valve near the toilet.
  • To drain all of the water from the tank and toilet bowl, flush the toilet. To drive any residual water down the drain pipe, use a plunger.
  • Remove any residual water from the tank with a sponge and a bucket while wearing rubber gloves.
  • Using an adjustable wrench, disconnect the supply line.
  • If the line has never been disconnected or has been attached for a lengthy period of time, it may be difficult to loosen at one or both connecting sites. If this is the case, a heavy-duty lubricant should be used to break down any rust.
  • Prepare a bucket and towel to catch and clean up any water that leaks from the supply line.

2. Check the Toilet Flange and Prep the Floor

  • Stuff a towel inside the dirt pipe to prevent sewage gas from entering and hardware from dropping in.
  • Make sure the hole on the floor is big enough to fit the closet flange up to the collar.
  • If the hole has to be widened, use a pencil to outline around the flange’s base, then use a jigsaw to cut away the extra flooring.
  • If the previous toilet’s flange and bolts are in good condition, they can be reused when installing a new toilet.
  • Replace it with a matching flange if it is cracked or damaged.
  • Insert the soil pipe into the closet bend dry. Place the flange over the soil pipe and measure the distance between the collar’s bottom and the finish floor.
  • Remove the dirt pipe and cut it to the previous measurement using a handsaw.
  • To ensure the flange’s collar sits on the floor, dry-fit the flange to the soil pipe and the soil pipe to the closet bend.

3. Install the Soil Pipe

  • The next step in replacing a toilet is to apply PVC primer to the inside of the closet bend and one end of the soil pipe.
  • Apply PVC cement to the same surfaces and twist the dirt pipe into the closet bend right away.
  • Prime and cement the soil pipe’s free end and the interior of the closet flange. Twist and press the flange on the soil pipe until the collar is flush with the floor.
  • Rotate the collar so that its slots are to the right and left of the hole.
  • Screw stainless steel screws long enough to bite into the subfloor into the collar.

4. Attach the Stop Valve

  • Turn off the water supply valve in the bathroom.
  • Submerge the supply line in a bucket, then cut it using a tubing cutter.
  • Allow 1 inch of pipe to connect the stop valve and escutcheon. Allow the pipe to drain completely.
  • Remove the handle and stem from the valve.
  • Using a rag, dry the pipe inside and out.
  • Using a wire-brush pipe cleaner, clean the inside and outside of the pipe, as well as the interior of the valve’s intake. Flux should be applied to both locations.
  • With a propane torch, heat the supply line stop valve junction.
  • Remove the flame and pass the solder around the junction once the joint is hot enough to melt the solder.

5. Install New Wax Ring and Place the Toilet

  • Place the wax ring flat-side down over the flange.
  • Lift the toilet bowl over the flange, line the holes in the toilet bowl’s base with the closet bolts, and drop the toilet bowl onto the ring.
  • Press the bowl down into the wax ring without twisting or shaking it until the bowl’s base rests on the floor. Shim the bowl if the floor is uneven.
  • Place a nylon washer over each bolt before hand-threading the nuts.
  • Tighten the nuts one quarter turn at a time using a wrench, alternating between the two. Stop when the wrench encounters solid resistance; overtightening will cause the bowl to break.
  • Trim the closet bolts two threads above the top of the nut with a hacksaw. Snap the plastic bolt covers onto the bolts.

6. Attach the Toilet Tank

Connect the flapper chain to the tank’s handle. If you have a two-piece toilet, connect the tank to the bowl. Because the bowl and tank are permanently joined, you may skip this step if you have a one-piece toilet.

  • Insert the tank bolts after inserting the small-diameter rubber tank washers from the interior of the tank.
  • Lower the tank gently onto the back of the bowl, guiding the tank bolt ends into the holes.
  • Place a nylon washer on each bolt before hand-threading the nuts.
  • Secure the tank to the bowl by tightening each tank bolt alternately until the tank pulls down and meets the bowl.

7. Attach the Supply Line

  • Curve the supply line with a tubing bender to fit between the stop-valve output and the tank-supply fitting.
  • Then, with the flared end up, hold the pipe between these two places and mark it half an inch below the outlet. This will leave enough line inside the outlet to work.
  • Using a tubing cutter, cut the supply line at the above-mentioned point.
  • Slip the plastic nut, compression nut, and compression ring onto the supply. Apply a thin coat of Teflon paste to the outlet threads of the valve, then seat the line in the outlet and tighten the compression ring.
  • Tighten the supply line’s plastic nut under the tank by hand. Then, using a wrench, tighten the compression nut.

8. Install Toilet Seat and Lid

  • Place the seat assembly over the bowl, then insert the plastic bolts through the seat back and the seat holes in the bowl; tighten the nuts by hand.
  • The next step in installing a toilet is to select a toilet seat. Because there are many different types of toilet seats and lids, make sure you choose one that is compatible with your toilet model.
  • Measure your new toilet to determine the suitable toilet seat size.
  • A customized component, such as an elevated or heated toilet seat, may require specific installation. Position and secure the new seat in accordance with the manufacturer’s instructions.

Final Step: Test for Leaks

  1. Turn on the main supply line, open the stop valve, and fill the tank.
  2. The final stage in toilet installation is to check for leaks. Now that the toilet has been fitted, your final step is to check for leaks.
  3. Turn on the water shut-off valve slowly and let the tank fill.
  4. Flush the toilet and concentrate on the toilet’s base and the place where the tank and bowl connect.

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