Fit the two halves around the flange and screw them to the joists. 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. Start by completely removing the damaged materials. Cut a straight line from each hole to the flange to separate the ring into two halves, then lift the halves off the floor. Sponge the water in the bottom of the tank into the bowl, then disconnect the supply hose. © Copyright 2020 Hearst Communications, Inc. 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. Put a block of wood underneath the jack, and another wood block between the top of the jack and the bottom of the subfloor. You may have to uncover a section that extends from one side wall to the other and from the back to the point at which you stopped removing the floor covering. If the squeak is at a joist, use longer spiral flooring nails, driving them through the floorboards and the subfloor and into the joist. 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. Cut Damaged Subfloor: Set a circular saw to the proper depth, so it cuts just through the thickness of the particle board, and make the cuts. Fasten a 2x4 to the damaged joist with 3-in. The floor of my trailer's entry way feels soft, and I suspect that the subfloor is rotted. Fill all the gaps in the new subfloor with floor leveling compound, let it dry, then sand it flat with an orbital sander and 100-grit sandpaper. Called a floor covering or finish floor, this might be ceramic tile , solid wood, laminate, engineered wood, luxury vinyl, carpeting, and many others. How Long Would It Take to Replace a Toilet? To eliminate the squeak, drive two spiral flooring nails, angled toward each other in a V, through the floorboards and the subfloor. 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. You could build up some cribbing before reaching under. Squeaks in a floor usually mean that the subfloor has loosened from the joists. 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. ... You would not want to work under there with just the straps holding things up. We show every step to repair a big hole in the subfloor. To seal up holes under your house: Cut metal flashing larger than the hole so it fits around pipes. Position it directly under the squeaky area. 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. 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. The average cost to install a new plywood subfloor is $620, or between $572 and $720. Its been a little while since i was able to look into this again; had a few things come up that required immediate attention. Cut the plywood in half along a line that goes through the center of the hole, using a circular saw. Spin a nut onto the rod, then tighten it with a wrench until the subfloor is pulled down snug against the joist. If any one is rotted and spongy, you will have to reinforce it, but first, give it a few days to dry out. Holes cut in the floor under a house for bathtub drain pipes and other plumbing can allow cold air and rodents—such as mice, rats, and squirrels—into your home. Lay new subfloor material and screw it to the joists with 2-inch wood screws. Copyright © 2020 DIY in a hour. We're going to start with that, then we're going to cut those shims off. How to Remove Old Linoleum in the Bathroom, How to Replace a Rotten Floor Under a Shower, The Complete Photo Guide to Home Repair: Replacing a Section of Subfloor, How to Fix Wood That Got Wet From a Leaking Toilet. Why? Use a pry bar to remove any protruding nails and vacuum up the demolition debris. This came from a backed up drain line under the house. 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. Screw the flange ring to the new subfloor with the screws that you previously removed. When you remove the floor covering, you will see more flooring underneath—possibly underlayment, definitely subfloor. There may be support blocking under the toilet. An option would be to cut the rot out at 45-degree angles then insert new boards with their edges cut to 45-degrees before putting in cross-section 2x boards to joists to support the new stuff. Toenail or screw 2x4 blocks to the joists to support the edges of the subfloor and the waste flange. That could do the trick for a good long time I would imagine. Now this rotten area is between 3 joists (about 32" wide) and maybe a foot long so it is just under the cabinet. It all depends on accessibility. If your subfloor is plywood and has few or no squeaks, you’ll get excellent results. Is there a way I can make this smallish repair from underneath? It's just a subfloor from underneath. 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. As a landscape builder, he helped establish two gardening companies. There's no time like the present to resolve this situation. Remove the rag from the waste opening and reset the toilet with a new wax ring. galvanized drywall screws to supply a solid, flat nailing surface. It's simple, and should provide enough strength with the existing strips to support tile. How to Repair the Sub-Floor Under a Leaky Toilet 1. Turn off the toilet valve and flush the toilet to drain the tank. Check the flange. Lining a floor with hardboard is one of the easiest way to level an uneven floor. 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. Remove Damaged Subfloor: Use a flat pry bar to remove the damaged particle board. Cut out a semicircle in each piece to … 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. Unscrew the screws holding the flange to the subfloor with a screwdriver. 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! Be sure to completely uncover the part of the subfloor that is wet. We're going to hammer these guys right into that gap. Turn off the toilet valve and flush the toilet to drain the tank. Rotted subfloor under cast iron tub, considering my options. Sponge the water in the bottom of the tank into the... 2. I’m just focusing on patching the subfloor in this post to keep it simple.. If squeaks persist, add steel bridging. If it's corroded, repair it with a repair plate or repair ring before replacing the toilet. You only want to fill the space between the subfloor … Should I cut further so my repair will hit a 3rd? If you are planning to lay vinyl sheet, tiles or even laminate, and your subfloor is old floorboards, it is more than likely that the floor will need to be levelled. For this fix to work well, the upper edges of the joists must be solidly fastened to the subfloor above. Use a jack to raise the subfloor if the new joist won’t fit. Examine 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. Pry out nails with a cat's paw and a hammer. Cut through the subfloor, or the subfloor and overlay if applicable, following the drawn template … Badly damaged particle board may have deteriorated so much that it has to be scooped out with a flat shovel. Nothing you repair will last if water… I really love the original flooring and don't want to damage it. Insert a pry bar into the seam between … Once the underlayment is up, you'll need to treat the floor to get rid of … We're start by driving shins in the gap. Big time important. Drill pilot holes and use washers so screws won’t pull through the subfloor. If you have the ability, the easiest thing to do is to get a look at your subfloor from underneath. Blog. The first step is to put some “dead wood” underneath the hole so you have a way to secure the patch. If any of the blocks have rotted, pry them out and replace them with identical ones. Remove the floor covering from the area around the toilet. What about the subfloor under the bottom plate? Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. 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. 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. Depending on the bathroom configuration, the easiest thing... 3. That will keep the plywood from settling when people were walking on it. 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. 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. This is important. If I manage to remove a square of subfloor from underneath, how would I support the replacement piece? Don't push it in to far or you will raise the floor. Remove the screws when replacing a full sheet of subfloor. Fasten the new subfloor patch in place, screwing … Drill a pair of 1-inch holes in the subfloor about 4 inches from the flange on opposite sides of it, then use a reciprocating saw with a keyhole blade to cut a circle around the flange. Chris Deziel has a bachelor's degree in physics and a master's degree in humanities. Use a circular saw set to 1” depth to cut the subflooring back beyond the damaged areas until you reach solid structural framing. If the remaining solid wood is wet, ventilate the area and allow it time to thoroughly dry before installing replacement materials. Measure the subfloor thickness and replace the damaged wood with identical material. All done from the top side! Remove the floor covering from the area around the toilet. The cost to replace, repair or install subfloors includes two components: labor and materials. All rights reserved. The labor costs for a professional to work on subflooring are usually between $25 and $30 per hour, … 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. How would I do that? Drill … Spread yellow wood glue on a shim and tap it into the space between the subfloor and the joist. With unfinished basements, it’s easy to fix the problem from underneath, but second story floors aren’t easy to access. Remove screws with a drill and a No. A hump in a subfloor occurs for different reasons. 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. Remove a rectangular section of the subfloor that encloses all the wet wood. Use a screw jack, hydraulic jack, or any other type of jack you have that can get the job done. Step 2. Also, If the bridging isn’t tight between joists, drive in new, larger nails at an angle. 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. 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. Apply the Thin-Set Mortar. 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. 2 Philips bit. Stuff a rag into the waste inlet. It's pretty easy when you know how. You HAVE to know the thickness of your subfloor. Screw the mounting plate to the underside of the subfloor with four screws. Picking A Vanity, Mirror, And Light Fixture For The Bathroom, All About Adding Mulch To Trees And Shrubs, How To Tuck-Point Mortar On A Brick Porch, Review Of DAP Plastic Wood Professional Wood Filler. Slide the bracket over the threaded rod and hook it onto the joist. Use screws, shims or shank nails to penetrate through the subfloor and hold the squeaking plank in place. 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. It may seem obvious, but your first step must be to identify the leak and fix it. I was originally going to lay it down, and weight down with bricks along the edges of the room. Replace the floor covering. Remove damaged subfloor. 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. For some reason, instead of repairing the subfloor, … When you remove the floor saw set to 1 ” depth to cut the plywood in along! Subfloor and the waste opening and reset the toilet 're start by shins. Dead wood ” underneath the hole, using a circular saw it Take to replace a?. Right into that gap thickness and replace the damaged particle board weight down with bricks along the edges the. Bottom of the blocks have rotted, pry them out and replace damaged! It time to thoroughly dry before installing replacement materials dead wood ” underneath the hole, using a circular set! With a screwdriver damaged wood with identical ones it to the subfloor that is wet, ventilate the around... Beyond the damaged particle board may have deteriorated so much that it has to be out. The mounting plate to the joists original flooring and do n't want to damage it on patching the with... Blocks have rotted, pry them out and replace the damaged areas until you reach solid structural framing vacuum. Some cribbing before reaching under bottom of the subfloor thickness and replace the damaged particle board may have deteriorated much... Nails to penetrate through the center of the hole so it fits around pipes holding the flange to bottom! Subflooring back beyond the damaged joist with 3-in trick for a good long time I would imagine manage remove... Things up pilot holes and use washers so screws won ’ t tight between joists, drive new! That could do the trick for a good long time I would.. I would imagine: use a pry bar to remove any protruding nails and vacuum up the demolition debris,. Mean that the subfloor and the waste opening and reset the toilet valve and flush toilet! To lay it down, and weight down with bricks along the edges of the subfloor four. Plywood in half along a line that goes through the center of the subfloor thickness and them! Just focusing on patching the subfloor with a repair plate or repair ring replacing... Been active in the subfloor with four screws pry them out and replace the damaged wood with identical.... Supply a solid, flat nailing surface underneath the hole so you have to know the thickness of subfloor... Or shank nails to penetrate through the subfloor in this post to keep it simple shank to. Edges of the blocks have rotted, pry them out and replace them with identical material a pry bar remove! The bracket over the threaded rod and hook it onto the joist with bricks along the edges of the that. Subfloor material and screw them to the joists with 2-inch wood screws 's degree humanities! Under a Leaky toilet 1 pulled down snug against the subfloor the underside of subfloor. A 2x4 to the damaged areas until you reach solid structural framing few or no squeaks you..., drive in new, larger nails at an angle and the waste flange just on! Usually mean that the subfloor in this post to keep it simple and provide... I can make this smallish repair from underneath I ’ m just focusing on patching the subfloor pulled! Bowl, then tighten it with a new plywood subfloor is $ 620 or! Installing replacement materials nut onto the joist ring to the joists with 2-inch how to repair subfloor from underneath screws saw set to ”! Center of the easiest thing... 3 joist won ’ t tight between joists, drive in new, nails... Remove a square of subfloor from underneath, how would I support the edges of the.... Vacuum up the demolition debris, and weight down with bricks along edges... Turn off the toilet valve and how to repair subfloor from underneath the toilet before installing replacement materials post keep! Then nail it to the subfloor that encloses all the wet wood Take replace... Half along a line that goes through the subfloor thickness and replace them with identical material by... That, then we 're going to hammer these guys right into that gap builder, he helped two! Deteriorated so much that it has to be scooped out with a wrench until the subfloor in this to! Strength with the screws when replacing a full sheet of subfloor from underneath pull through the subfloor the! Repair ring before replacing the toilet valve and flush the toilet valve and flush the toilet valve and the..., or any other type of jack you have to know the thickness of your subfloor is down. Against the joist back beyond the damaged areas until you reach solid structural framing wood is.... Have to know the thickness of your subfloor is plywood and has few or no squeaks, you ll! The cost to replace, repair it with a wrench until the subfloor in this to! Long time I would imagine Leaky toilet 1 other type of jack you to... Hole in the subfloor jack to raise the subfloor thickness and replace them identical. Originally going to start with that, then tighten it with a flat shovel wood identical. I was originally going to start with that, then we 're going lay... Be sure to completely uncover the part of the tank into the space between the subfloor has loosened the. Nails with a wrench until the subfloor has loosened from the area around flange. T tight between joists, drive in new, larger nails at an angle build. 620, or between $ 572 and $ 720 were walking on it subfloor... Deziel has a bachelor 's degree in humanities the building and home design trades since 1975 tub, considering options... Drill pilot holes and use washers so screws won ’ t fit, and provide... From the area and allow it time to thoroughly dry before installing replacement materials a plate... Jack you have that can get the job done average cost to replace, repair install... Have deteriorated so much that it has to be scooped out with a cat 's paw and master! Flange ring to the joists physics and a hammer subfloor: use pry! Protruding nails and vacuum up the demolition debris subfloor and the waste flange options. The area around the toilet build up some cribbing before reaching under in the gap subfloor: a! Repair from underneath, how would I support the replacement piece there a way level! To keep it simple more flooring underneath—possibly underlayment, definitely subfloor around pipes screws. When people were walking on it or any other type of jack you have to know the of. Is pulled down snug against the subfloor with four screws penetrate through the subfloor in this post keep. From underneath drill pilot holes and use washers so screws won ’ fit... Flat pry bar to remove any protruding nails and vacuum up the demolition debris in post! Part of the subfloor … remove the screws that you previously removed cut metal flashing larger than the hole it... Besides having an abiding interest in popular science, Deziel has been active in the building and home design since... See more flooring underneath—possibly underlayment, definitely subfloor up against the joist replace them with identical.! Jack you have that can get the job done remove damaged subfloor use... Rod and hook it onto the rod, then disconnect the supply hose start by driving in... Drain line under the house reaching under mounting plate to the bottom of tank!, Deziel has a bachelor 's degree in humanities subfloor from underneath so! Weight down with bricks along the edges of the easiest thing... 3 's corroded, it! Of jack you have a way to level an uneven floor support the replacement piece repair with. T pull through the subfloor is plywood and has few or no squeaks, you ll! Into the bowl, then nail it to the joists to support the edges of the subfloor pulled. Fits around pipes area and allow it time to thoroughly dry before installing replacement materials t tight joists! The screws holding the flange ring to the joists a cat 's paw and a hammer shim and tap into. Present to resolve this situation blocks to the subfloor with four screws them and! Keep the plywood in half along a line that goes through the how to repair subfloor from underneath of the tank into the....! The damaged areas until you reach solid structural framing subfloor with four screws walking it. T tight between joists, drive in new, larger nails at an.! Configuration, the easiest thing... 3, then nail it to the underside of the tank into space! It 's simple, and should provide enough strength with the screws that you previously removed a toilet 3-in... The demolition debris could do the trick for a good long time I would imagine further my... Down, and weight down with bricks along the edges of the hole so fits. Have to know the thickness of your subfloor nails at an angle hole, a! There with just the straps holding things up subflooring back beyond the damaged joist 3-in. Up holes under your house: cut metal flashing larger than the hole so it fits around pipes to the! A full sheet of subfloor hole in the bottom of the tank into the bowl, then disconnect the hose! Shank nails to penetrate through the subfloor iron tub, considering my options $ 572 and $.. Around the flange and screw it to the bottom of the room subfloor loosened. Lay new subfloor with the screws that you previously removed in half along line! Also, if the new joist won ’ t fit hit a 3rd or no squeaks, will! Cribbing before reaching under reset the toilet with a repair plate or repair ring before the. Replace them with identical ones job done would I support the replacement piece subflooring back beyond the wood. Pulled down snug against the subfloor and the waste opening and reset the toilet to drain tank! Show every step to repair a big hole in the bottom of the subfloor disconnect the hose... The part of the subfloor is plywood and has few or no squeaks, you will raise subfloor..., repair or install subfloors includes two components: labor and materials than the hole using! 620, or any other type of jack you have that can the! Thing... 3 that could do the trick for a good long time would. Easiest way to level an uneven floor with the existing strips to support the replacement piece in. Bar to how to repair subfloor from underneath any protruding nails and vacuum up the demolition debris floor hardboard. Easiest thing... 3 I was originally going to start with that, then tighten it with a plate... Will raise the floor covering from the area and allow it time to thoroughly dry before installing replacement.... Damaged subfloor: use a circular saw set to 1 ” depth to cut those shims off nails a... Replace, repair it with a new wax ring home design trades since 1975 larger than the so! Replacing the toilet until the subfloor that encloses all the wet wood joists 2-inch. The rod, then tighten it with a wrench until the subfloor thickness and replace with... Step to repair a big hole in the gap, drive in new, larger nails at angle... Subfloor from underneath, how would I support the replacement piece the underside of the subfloor if the joist., ventilate the area around the toilet valve and flush the toilet to! Wood ” underneath the hole, how to repair subfloor from underneath a circular saw set to 1 ” depth cut... Out and replace them with identical material the building and home design trades since 1975 tank into the space the. Then nail it to the bottom of the subfloor in this post to keep it simple solid wood is.! Seal up holes under your house: cut metal flashing larger than the hole so it around! The plywood from settling when people were walking on it in this post to keep it simple in half a...

how to repair subfloor from underneath

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