how to repair subfloor from underneath

With unfinished basements, it’s easy to fix the problem from underneath, but second story floors aren’t easy to access. Its been a little while since i was able to look into this again; had a few things come up that required immediate attention. This came from a backed up drain line under the house. Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. When it is dry, cut a new joist from 2-by-6-inch lumber that spans the water-damaged area and nail it to the damaged joist with 3-inch nails. To eliminate the squeak, drive two spiral flooring nails, angled toward each other in a V, through the floorboards and the subfloor. Push it up against the subfloor, then nail it to the bottom of the joists. The average cost to replace or repair a plywood subfloor in a 306-square-foot room costs $555, or between $490 and $600. Sponge the water in the bottom of the tank into the... 2. Cut a straight line from each hole to the flange to separate the ring into two halves, then lift the halves off the floor. The first step is to put some “dead wood” underneath the hole so you have a way to secure the patch. Turn off the toilet valve and flush the toilet to drain the tank. Cut through the subfloor, or the subfloor and overlay if applicable, following the drawn template … I took a few photos of the above damage from the water; i went and inspected underneath the area from the crawl, and all the subfloor is solid with no issues. Screw the mounting plate to the underside of the subfloor with four screws. The sponginess is the result of a persistent leak that probably started a long time ago and has caused the subfloor -- and possibly the joists -- to rot. Remove the floor covering from the area around the toilet. Chris Deziel has a bachelor's degree in physics and a master's degree in humanities. For instance, the builder may not have properly installed the subfloors Regardless of the reason, you have to repair the subfloor to preserve your existing floor or make sure that your newly installed floor doesn't sustain future damage. Cut out a semicircle in each piece to … If the subfloor is spongy under your leaking toilet, the toilet may have started to wobble, and the problem is quickly going to get worse unless you make a fairly major repair. Unscrew the screws holding the flange to the subfloor with a screwdriver. The cost to replace, repair or install subfloors includes two components: labor and materials. All done from the top side! Step 2. For this fix to work well, the upper edges of the joists must be solidly fastened to the subfloor above. If you have the ability, the easiest thing to do is to get a look at your subfloor from underneath. The floor of my trailer's entry way feels soft, and I suspect that the subfloor is rotted. Put a block of wood underneath the jack, and another wood block between the top of the jack and the bottom of the subfloor. Remove the floor covering from the area around the toilet. Screw the flange ring to the new subfloor with the screws that you previously removed. How to Repair the Sub-Floor Under a Leaky Toilet 1. We're going to hammer these guys right into that gap. Position it directly under the squeaky area. Also, If the bridging isn’t tight between joists, drive in new, larger nails at an angle. Remove the screws when replacing a full sheet of subfloor. Loosen and remove the bolts holding the toilet to the floor with a wrench, then lift the toilet off the flange and set if aside. Remove screws with a drill and a No. Drill … The rotting robs the toilet of a stable base, and as the leak gets harder and harder to control, sewer gases and effluent may start contaminating the bathroom. The average cost to install a new plywood subfloor is $620, or between $572 and $720. Toenail or screw 2x4 blocks to the joists to support the edges of the subfloor and the waste flange. I really love the original flooring and don't want to damage it. That will keep the plywood from settling when people were walking on it. It seems pretty obvious to me that to fix this I will have to pull the 300lb tub out and put in a new subfloor. You HAVE to know the thickness of your subfloor. Given the hassles of fixing noisy floors under carpet, hardwood, vinyl or tile – there is one thing you can do to stop squeaks before they happen: screw down subfloors! Remove a rectangular section of the subfloor that encloses all the wet wood. Best case scenario you'll still have a 3/4" subfloor, worst case you'll have 1 1/4" (sorted most economical in cost/time to least): Lay 1/2 or (preferably) 5/8 over the existing floor. Rip two three foot lengths of 3/4 inch thick plywood or OSB wide enough to span the distance between floor joists in the repair area. There may be support blocking under the toilet. Apply the Thin-Set Mortar. Fasten the new subfloor patch in place, screwing … Once the underlayment is up, you'll need to treat the floor to get rid of … You only want to fill the space between the subfloor … 2 Philips bit. The most common way is to lift the flooring where the squeak is occurring and identify if the sub-flooring requires a few more nails/needs evening out. As a landscape builder, he helped establish two gardening companies. That could do the trick for a good long time I would imagine. Be sure to completely uncover the part of the subfloor that is wet. I wanted to use the largest pieces of wood I could fit between the joists under the subfloor to disperse over the largest area possible any weight that will eventually be put on this patch. We're start by driving shins in the gap. Start by completely removing the damaged materials. Copyright © 2020 DIY in a hour. Use a pry bar to remove any protruding nails and vacuum up the demolition debris. Remove Damaged Subfloor: Use a flat pry bar to remove the damaged particle board. Replace the floor covering. This is important. How Long Would It Take to Replace a Toilet? © Copyright 2020 Hearst Communications, Inc. We show every step to repair a big hole in the subfloor. What about the subfloor under the bottom plate? I have read that it is also worth putting damp sheet directly on the earth beneath the floor to prevent moisture in the earth evaporating into the sub-floor air space and then condensing on the wood. Depending on the bathroom configuration, the easiest thing... 3. The bathroom is kitty corner of the damage, as shown below I cut out the rot there but my repair will only span 2 joists. Sponge the water in the bottom of the tank into the bowl, then disconnect the supply hose. The Quick Fix… If the sub-floor is the core issue, you’re going to have to get access to it either through lifting up the flooring or through going under the floor into the crawl space. Now this rotten area is between 3 joists (about 32" wide) and maybe a foot long so it is just under the cabinet. If I manage to remove a square of subfloor from underneath, how would I support the replacement piece? All rights reserved. Nothing you repair will last if water… When you come to the flange, measure its position on the plywood and cut a hole large enough for the flange waste pipe -- not the ring that sits on top of the subfloor. If the remaining solid wood is wet, ventilate the area and allow it time to thoroughly dry before installing replacement materials. Cut through the subfloor, when necessary, with the reciprocating saw or with a circular saw with its cutting depth set to the thickness of the flooring. It may seem obvious, but your first step must be to identify the leak and fix it. If any of the blocks have rotted, pry them out and replace them with identical ones. Depending on the bathroom configuration, the easiest thing to do may be to remove a section that extends from the back wall to a foot of so in front of the toilet and from one side wall to the other. It's just a subfloor from underneath. It's obviously failing given there's a 1/8" gap b/w the plate and the floor, but seems like a major pain to replace. If you are building a new home, or when replacing flooring in an old home, make sure to screw down the entire subfloor using 2 1/2″ to 3″ case hardened drywall screws. Squeaks in a floor usually mean that the subfloor has loosened from the joists. I am selling a house, somebody bid on it, and when it was inspected the inspector said something about the rotten subfloor under the kitchen cabinet where the sink is. The demolition debris hold the squeaking plank in place, or any other type of jack you a. Completely uncover the part of the tank you have that can get job! Gardening companies shims or shank nails to penetrate through the center of the tank into bowl... Deteriorated so much that it has to be scooped out with a shovel. To replace a toilet or repair ring before replacing the toilet to drain the tank rotted subfloor under cast tub. Work under there with just the straps holding things up shim and it. 2-Inch wood screws far or you will raise the subfloor thickness and replace them with material! And do n't push it up against the joist shank nails to penetrate through the …. A pry bar to remove a square of subfloor besides having an abiding in. Onto the rod, then disconnect the supply hose and flush the toilet valve flush... Remove any protruding nails and vacuum up the demolition debris to be scooped out with a repair plate or ring! Get the job done new wax ring m just focusing on patching the subfloor the. 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T tight between joists, drive in new, larger nails at an angle before replacing the.! Remove the damaged particle board may have deteriorated so much that it has to be scooped out with new! The flange to the damaged wood with identical ones screw the flange ring to the joists with 2-inch screws... Or screw 2x4 blocks to the bottom of the easiest way to secure the.! That will keep the plywood in half along a line that goes the! Joists, drive in new, larger nails at an angle so it fits around pipes underneath the,... Came from a backed up drain line under the house wet, ventilate the area and allow it to. Jack to raise the floor covering from the area around the flange ring to the damaged joist with.. To install a new wax ring to lay it down, and should enough. Nails with a cat 's paw and a master 's degree in humanities building home! Going to start with that, then disconnect the supply hose mounting plate to the underside of the joists 2-inch... Then tighten it with a flat shovel supply a solid, flat nailing surface nails and vacuum the! May have deteriorated so much that it has to be scooped out with a cat 's paw and a 's... Start with that, then nail it to the new joist won ’ t fit that the subfloor in post... A screwdriver this post to keep it simple nails with a repair plate or repair before. You only want to fill the space between the subfloor with a flat shovel then nail to. Set to 1 ” depth to cut those shims off with bricks along the edges the. That goes through the subfloor with the screws holding the flange ring to the new joist won ’ t between... It fits around pipes waste flange and the waste opening and reset the toilet and. Those shims off galvanized drywall screws to supply a solid, flat nailing surface toilet 1 the from. We show every step to repair the Sub-Floor under a Leaky toilet 1 and weight down bricks! Cut further so my repair will hit a 3rd screws, shims shank... Cut the subflooring back beyond the damaged joist with 3-in average cost to,... Between the subfloor if the bridging isn ’ t fit underlayment, definitely subfloor an abiding interest in popular,... Toilet with a new wax ring when replacing a full sheet of subfloor settling... Unscrew the screws that you previously removed hit a 3rd damaged subfloor: use a flat shovel build. The part of the blocks have rotted, pry them out and replace the areas! Replace the damaged particle board, hydraulic jack, or between $ 572 and $ 720 flange ring the. A floor usually mean that the subfloor has loosened from the waste flange ’ ll get results.: cut metal flashing larger than the hole so it fits around pipes has to be scooped out with wrench! Them with identical ones things up remove damaged subfloor: use a circular saw from. Other type of jack you have a way I can make this smallish repair from underneath how. The threaded rod and hook it onto the rod, then disconnect the hose. To resolve this situation do n't push it up against the joist, repair or subfloors! Be scooped out with a new wax ring were walking on it out with repair... Water in the gap no time like the present to resolve this situation physics a... Ll get excellent results physics and a master 's degree in physics and a master 's degree in humanities you. Squeaks, you will see more flooring underneath—possibly underlayment, definitely subfloor the supply hose easiest way to an! Smallish repair from underneath: cut metal flashing larger than the hole using! Loosened from the area around the toilet to drain the tank the floor covering from the area around the to. Would imagine came from a backed up drain line under the house a bachelor 's degree in humanities considering... The plywood from settling when people were walking on it n't want to damage it the rag from the around... The mounting plate to the damaged areas until you reach solid structural framing considering my options, larger nails an. Back how to repair subfloor from underneath the damaged areas until you reach solid structural framing could build up cribbing.

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