An off-set toilet flange is different from a traditional toilet flange in that the top opening, which the wax ring and toilet sits above, is offset from the insertion point by varying amounts. Sometimes this amount can be up to an inch and a half.
Installing an offset flange in place of a traditional straight flange is not compliant with building code; it is considered a modification that is unacceptable. If the installation of the flange is to replace an existing one, however, that is considered "maintenance" of the existing fittings, which is acceptable.
Despite the fact that off-set flanges are against code, they can be found in most home improvement stores. In any case, frequently remodeling a bathroom or updating a bathroom might require this particular type of installation. A wall may have moved a bit or a new angle is desired for the toilet in a bathroom. An offset flange can accommodate all of these needs, and there are plumbers who will endorse certain off-set flanges from certain manufacturers. Here you will find the information needed to install such a flange.
Step 1 - Dry Fit the Flange
First, you will want to determine the exact positioning of the offset flange. One of the biggest considerations will be the flooring underneath the toilet. Due to the offset of the flange, if there is bare subfloor underneath the existing toilet, it is likely that this will show with the offset. If there is tile underneath the toilet, it is entirely possible that there are awkward cuts underneath the toilet. If either is the case, take some time to brainstorm to outfit the bared subfloor and how to modify it if needed. Dry fit the flange to get the needed position, and mark the position with a pencil.
Step 2 - Cement the Flange
Apply the PVC primer to the top of the receiving end of the PVC pipe. It may be desirable to raise the PVC up out of the floor so that it is easily reachable to apply the primer. Swab a good amount around the top of the PVC, about the top 2 inches of the pipe. Read the directions on the primer to allow for the proper drying or curing time. Once that has passed, apply PVC cement to the inside of the flange and fit over the top of the PVC drain piping, adjusting the position to match the markings on the floor.
Step 3 - Secure the Flange
Secure the flange to the subfloor with screws and a drill. Caulk around the base of the flange. Apply a thin bead all the way around the base of the flange, and smooth the caulk with a wet fingertip. Allow the caulk to cure for at least 12 hours before continuing the installation of the wax ring and toilet.