

Make sure both bolts are at equal distances from the back wall, which will ensure that the toilet tank will be parallel to the wall. The thickness of your floor will dictate the required thickness of the wax ring. Next, install a new wax ring that fits your new flange. There’s no need to use an adhesive when installing a gasket-sealed PVC flange. And to reinforce HJ's remarks, do make certain you have vented properly and that you have used the proper fitting and that they are installed correctly. Press the toilet flange down into the drain opening, using the T-bolts as reference points for positioning. Slide the toilet flange bolts into the new flange. Even though the installed toilet might be perfectly level when it is first installed, it may become unlevel over time. A look at house price inflation over the past 10 years, how the market has.
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The raising of the toilet causes it to rock from side to side. If your toilet is bolted to the floor, you can undo the bolts to remove it. A 4" drain allows you to go with either and inside or outside fitting flange. If the toilet flange, the round item that sits under the toilet and connects the toilet to the drain pipe, is higher than the floor, the toilet becomes raised. The process for setting it this way is similar to the above-the-floor method in almost every way including the requirement for a wax ring and closet bolts. The other option for installing a toilet flange is to set it flush with the floor. The inside fitting flanges reduces the interior diameter of the pipe too much. Setting a closet flange flush with the floor. Whether you're replacing yours because it's old, or because you just want a new style, all you need are some basic tools and a few minutes.

If your drain line is only 3", use a flange that fits on the outside of the pipe. Installing a new toilet seat is an easy DIY project. If the toilet is in an uneven floor then toilet shims should be used to level it. A toilet flange should ideally be 1/4 inch above the finished floor. Toilet bolts can be easily tightened but a a broken toilet flange will need to be replaced. Make certain it is orients so the flange bolts are in proper alignment, and to reiterate JD's advice about the size of the flange. Loose toilet bolts and/or a broken flange are the ones most responsible for a wobbling toilet. A word of caution when installing the flange. I use stainless steel screws for toilet flanges, just regular steel for mounting shelves, outlet boxes, and etc. The sleeves and screws will provide ample holding power for a flange. This is drills holes almost as easily a into wood. I use a 5/16" SDS drill bit in a small rotor hammer drill to drill the holes for the sleeves. While there is no question on the strength of Tapcons, they are more HD than you need for a toilet flange and are more difficult to install (IMHO) You still must drill holes into the concrete and notching the tile would be a good idea. I use lead sleeves with #12 sheet metal screws rather than Tapcons. There is little to add except to share my preference for anchoring into concrete. You have 2 excellent answers to your question.
