The flange appears to be in good shape. Gary Swart, Dec 13, 2014 #2. Also, the hole diameter is about 7.5" and 1 and 3/4" deep. In most homes, the back of the toilet tank is against the wall. This is a full sheet of Advantec that goes uner the new shower pan. Hello Everyone, How big should the hole be for this flange? The maximum would have a 5” diameter. It is a 4X3 closet flange, and i need to cut a hole in the subfloor. Then I'd measure from the edges of that hole to find where to cut the plywood edges to fit the hole. What are my options. Joined: Dec 13, 2014 Location: California. 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. 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. Cutting the actual hole is the least part of the project. What complicates things is a pipe running parallel to the joists just an inch or so beneath the subfloor. The actual cut line will be covered by the toilet base. Big time important. “The joist was cut to make room for the PVC waste pipe for the toilet. The flange rim will be fastened to the finished floor later. What is the largest size hole I can cut in the subfloor for the drain? I decided I would pull up the linoleum since it had water damage and put some new stuff down. Typically, the hole for the drain pipes is located 12 inches from the wall. How to Cut HardieBacker Cement Board. molo Member. Once you know the general layout of your HardieBacker you can cut it to size. It's the stainless steel 4" flange from depot. Set flange, re-tile, re-seat toilet. As I pulled up I found there was mold and significant damage to the sub-floor. 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. That's when I discover that the hole the previous homeowners cut into the floor is larger than my new toilet flange. He crawled under the house to check the status of things from underneath, and no wetness, no damage, etc. “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. Test fitting plywood layer that is cut in half to get around pipe, that will fit subfloor hole. Discussion in 'Toilet Forum discussions' started by molo, Oct 22, 2006 . The toilet flange and waste line are all cast iron. 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. Danpe New Member. In this case, once making the proper measurements, you can replace the plywood of the subfloor with the hole … 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. Here is one method to replace the sub-floor (plywood) under a toilet. 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. pain to cut them and box them in. The bathroom floor has newish vinyl flooring and I'd really prefer not to pull it up. And now, after thinking installing the toilet flange, I realize that the hole for the drain pipe is probably a bit too small. The center of the toilet flange should be 12″ from the finished wall (add a 1/2″ for drywall if measuring from the framing). 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). Sponsor Paid Advertisement . Remove damaged subfloor. 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. You HAVE to know the thickness of your subfloor. See more ideas about repair, toilet repair, home repairs. Step 2. Or suppose you’re roughing in a toilet and there’s a floor joist in your way. This is a typical repair if your toilet has leaked long enough to rot the sub floor. Thank you for the reply. 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. 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. The placement of the hole will determine where the toilet will sit, so be sure to consider this carefully before you get started. The ID of the toilet flange will fit over the drain pipe nicely. If your toilet has been leaking, there is a danger the wooden subfloor will be damaged as a result. 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. Hello everyone, A few months ago we had some water damage from a leaky toilet. Actually that photo is the concrete subfloor, covered with Red Gard a waterproofing membrane. Joined: Sep 23, 2006 Location: Cold New York. Cutting Subfloor hole for Toilet Flange. 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. 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. You may be able to use a different toilet rough-in to dodge the framing. 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. too involved being that I already have drywall below. 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". Cut a straight line from each hole to the flange to separate the ring into two halves, then lift the halves off the floor. 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. Thank you for your thorough response! 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. I'd then cut the hole for the flange allowance for final trimming of the plywood. However the OD of the toilet flange if 4" - exactly the same size as the hole! This is important. Dec 29, 2019 - Explore Bob McIntosh's board "Subfloor repair" on Pinterest. and these are wood I joists. A template is included in the drain kit box to guide the application. Hard for this untrained eye to tell just how it's attached. 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. 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. 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. 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. Cut a hole in the subfloor just large enough for the bottom part of the toilet flange to sit. Why? one issue that complicates this is fact that the vent is right there. Just get a water closet with a 10″ rough-in. before to cut hole in subfloor and work from there. My flange has two simple notches for the toilet bolts to hook onto, otherwise it's just a round disc. We had a 2-week old baby at the time which caused us to panic a little about the mold. Cutting joist not option. Months ago, I cut a 4" hole in the new sub-floor for the drain pipe. After three days, no more squishy! Sounds like the proper approach. Where to cut toilet pipe for new subfloor patch. After doing the research, that I should have done first, I realized that the hole was too big. How to cut a hole in ceramic tile with an angle grinder with a dry cutting diamond blade. And finally I'm ready to install the toilet flange. 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. Repairing a damaged subfloor is serious business, but it doesn't have to be scary. Prep plywood layer halves with screws. Note the cut is perpendicular to the joist. It's best to cut it out and replace with a solid piece of new subfloor. 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