Here is one method to replace the sub-floor (plywood) under a toilet. I cut one piece of wood for the floor and cut a hole, smaller than my husband's but still too big at abt 8 inches. In this project we cut the waste pipe for the toilet because we wanted to have the toilet flange sit on top of the tile. “The joist was cut to make room for the PVC waste pipe for the toilet. Once the screw tips are cut off flush with the basement ceiling the area will be prepped for the larger plywood second layer of support. Remove damaged subfloor. After doing the research, that I should have done first, I realized that the hole was too big. Danpe New Member. In this case, once making the proper measurements, you can replace the plywood of the subfloor with the hole … It's the stainless steel 4" flange from depot. Hard for this untrained eye to tell just how it's attached. The bathroom floor has newish vinyl flooring and I'd really prefer not to pull it up. What complicates things is a pipe running parallel to the joists just an inch or so beneath the subfloor. He crawled under the house to check the status of things from underneath, and no wetness, no damage, etc. And now, after thinking installing the toilet flange, I realize that the hole for the drain pipe is probably a bit too small. However the OD of the toilet flange if 4" - exactly the same size as the hole! before to cut hole in subfloor and work from there. That's when I discover that the hole the previous homeowners cut into the floor is larger than my new toilet flange. Sponsor Paid Advertisement . The toilet flange and waste line are all cast iron. The flange appears to be in good shape. Prep plywood layer halves with screws. This is a typical repair if your toilet has leaked long enough to rot the sub floor. Don't try to cut more than about 0.125 in (0.32 cm) deep with any single pass, or the tile will probably break in a random spot and you'll have to start over. What are my options. I need to find a way to close up this hole in such a way that the repair job can withstand the same amount of traffic as the undamaged subfloor in my room. I hope you are talking about underlayment, and you have a little more play front and back, but I cut them about 7 1/4" for a 7" flange. How to Cut HardieBacker Cement Board. Thank you for your thorough response! How to cut a hole in ceramic tile with an angle grinder with a dry cutting diamond blade. Drill a 3/8-inch hole with a twist drill so its edge falls just on the inside edge of the circle, then insert a rough-cut jigsaw blade and carefully cut the circle out, turning the saw constantly to keep the blade on the line. You HAVE to know the thickness of your subfloor. Where to cut toilet pipe for new subfloor patch. Cut a straight line from each hole to the flange to separate the ring into two halves, then lift the halves off the floor. Typically, the hole for the drain pipes is located 12 inches from the wall. The set-up you have now (can't be 100% on your setup because the pics don't tell the whole story) looks to be a bit shoddy and the surrounding subfloor looks to be water damaged. The actual cut line will be covered by the toilet base. too involved being that I already have drywall below. DH pulled the toilet and we put little pieces of wood around the hole in the floor to kinda separate the linoleum from the subfloor, and we put a fan on for the good part of three days to dry things out. Note the cut is perpendicular to the joist. Big time important. We had a 2-week old baby at the time which caused us to panic a little about the mold. Months ago, I cut a 4" hole in the new sub-floor for the drain pipe. Set flange, re-tile, re-seat toilet. A template is included in the drain kit box to guide the application. This is important. Dec 29, 2019 - Explore Bob McIntosh's board "Subfloor repair" on Pinterest. The drain pipe had been cut off and capped from below (via a nice new hole in our garage ceiling) and the old flooring and subfloor torn out, so there were no references to go by except for the toilet supply line. I'm replacing some rotted subfloor around a toilet, and I want to add blocking around the flange for extra support, and to give me a place to support the new pieces of subfloor (I'm not planning on replacing the flange). My flange has two simple notches for the toilet bolts to hook onto, otherwise it's just a round disc. I don't know what I measured when I cut the hole in the subfloor for the toilet drain, but you can see in the picture that it is off center, resulting in a big gap on the right. If you are talking about the subfloor, the layer that rests on the joists, the layer the flange is screwed into, then the hole should be not much more than 5". Actually that photo is the concrete subfloor, covered with Red Gard a waterproofing membrane. Repairing a damaged subfloor is serious business, but it doesn't have to be scary. Cutting Subfloor hole for Toilet Flange. Sounds like the proper approach. It's best to cut it out and replace with a solid piece of new subfloor. Cutting joist not option. I found this hole a while back when removing my old carpet: It was filled with a bunch of nice razor blades and nails, you know, the kind of stuff you just want to roll around in. Thank you for the reply. Also, the hole diameter is about 7.5" and 1 and 3/4" deep. Just get a water closet with a 10″ rough-in. The maximum would have a 5” diameter. Then I'd measure from the edges of that hole to find where to cut the plywood edges to fit the hole. The flange rim will be fastened to the finished floor later. The placement of the hole will determine where the toilet will sit, so be sure to consider this carefully before you get started. You may be able to use a different toilet rough-in to dodge the framing. Test fitting plywood layer that is cut in half to get around pipe, that will fit subfloor hole. Gary Swart, Dec 13, 2014 #2. Hello everyone, A few months ago we had some water damage from a leaky toilet. Or suppose you’re roughing in a toilet and there’s a floor joist in your way. Hello Everyone, How big should the hole be for this flange? You don’t know what’s under the subfloor so for all you know, there are electric or water lines and you do NOT want to cut these. In most homes, the back of the toilet tank is against the wall. Joined: Sep 23, 2006 Location: Cold New York. Discussion in 'Toilet Forum discussions' started by molo, Oct 22, 2006 . It is a 4X3 closet flange, and i need to cut a hole in the subfloor. Cutting the actual hole is the least part of the project. And finally I'm ready to install the toilet flange. If you’re simply replacing your toilet, and notice the center of your flange is only 10 inches from the wall, there’s no need to go through the hassle of moving the flange. What is the largest size hole I can cut in the subfloor for the drain? and these are wood I joists. This is a full sheet of Advantec that goes uner the new shower pan. The toilet gets attached to the flange after you've cut a hole for the flange pipe in the subfloor and screwed the flange ring to the floor. Step 2. Be as precise as possible but remember that the circle you cut doesn't need to be perfect. When replacing the wood subfloor around the toilet, you may have access to the joists so you can nail the new subfloor patch to them. “Eleven years later I find the toilet, flooring and subfloor all failing because of the sag in the floor, created by sawing through an I-beam joist that runs the length of the house,” Tackitybits says in a post at Fine Homebuilding’s Breaktime forum. Why? After three days, no more squishy! Cut a hole in the subfloor just large enough for the bottom part of the toilet flange to sit. If this is an entirely new cut, a 14 x 14-inch opening may be needed; again, check with professionals or the plumbing code to see how large the hole will need to be. As I pulled up I found there was mold and significant damage to the sub-floor. molo Member. The center of the toilet flange should be 12″ from the finished wall (add a 1/2″ for drywall if measuring from the framing). one issue that complicates this is fact that the vent is right there. Once you know the general layout of your HardieBacker you can cut it to size. The ID of the toilet flange will fit over the drain pipe nicely. See more ideas about repair, toilet repair, home repairs. He said they just placed floor over it and that if it gave us any issues, they would have to cut out that part of the vinyl and put in a metal plate, similar to what is around the floor plugs, but this would just serve as something to plug the hole in the subfloor. The process to repair the subfloor is not easy, but it needs to be handled promptly to avoid further damage to the wooden floor below, which could eventually result in the toilet falling through. I decided I would pull up the linoleum since it had water damage and put some new stuff down. Joined: Dec 13, 2014 Location: California. I looked under the toilet [made 1970] and found that the hole in the floor and the area formed in the porcelain for mounting the flange are nearly exactly the same size. I'd then cut the hole for the flange allowance for final trimming of the plywood. pain to cut them and box them in. If your toilet has been leaking, there is a danger the wooden subfloor will be damaged as a result. 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