how to repair subfloor from underneath

Depending on the bathroom configuration, the easiest thing... 3. Step 2. When you remove the floor covering, you will see more flooring underneath—possibly underlayment, definitely subfloor. 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. Remove Damaged Subfloor: Use a flat pry bar to remove the damaged particle board. The average cost to install a new plywood subfloor is $620, or between $572 and $720. If you have the ability, the easiest thing to do is to get a look at your subfloor from underneath. Toenail or screw 2x4 blocks to the joists to support the edges of the subfloor and the waste flange. If it's corroded, repair it with a repair plate or repair ring before replacing the toilet. 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. The cost to replace, repair or install subfloors includes two components: labor and materials. Drill … 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! Slide the bracket over the threaded rod and hook it onto the joist. ... You would not want to work under there with just the straps holding things up. How to Repair the Sub-Floor Under a Leaky Toilet 1. 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. Now this rotten area is between 3 joists (about 32" wide) and maybe a foot long so it is just under the cabinet. Remove screws with a drill and a No. Is there a way I can make this smallish repair from underneath? The average cost to replace or repair a plywood subfloor in a 306-square-foot room costs $555, or between $490 and $600. You only want to fill the space between the subfloor … There may be support blocking under the toilet. 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. Stuff a rag into the waste inlet. If I manage to remove a square of subfloor from underneath, how would I support the replacement piece? Its been a little while since i was able to look into this again; had a few things come up that required immediate attention. We're going to hammer these guys right into that gap. 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. 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. You HAVE to know the thickness of your subfloor. 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. Cut out a semicircle in each piece to … Fasten the new subfloor patch in place, screwing … If squeaks persist, add steel bridging. The first step is to put some “dead wood” underneath the hole so you have a way to secure the patch. It may seem obvious, but your first step must be to identify the leak and fix it. Why? The labor costs for a professional to work on subflooring are usually between $25 and $30 per hour, … Rotted subfloor under cast iron tub, considering my options. If any of the blocks have rotted, pry them out and replace them with identical ones. Spin a nut onto the rod, then tighten it with a wrench until the subfloor is pulled down snug against the joist. We're start by driving shins in the gap. Turn off the toilet valve and flush the toilet to drain the tank. Blog. Cut a straight line from each hole to the flange to separate the ring into two halves, then lift the halves off the floor. Replace the floor covering. As a landscape builder, he helped establish two gardening companies. 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. Also, If the bridging isn’t tight between joists, drive in new, larger nails at an angle. 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. Measure the subfloor thickness and replace the damaged wood with identical material. It's simple, and should provide enough strength with the existing strips to support tile. Sponge the water in the bottom of the tank into the... 2. For some reason, instead of repairing the subfloor, … This came from a backed up drain line under the house. Remove damaged subfloor. With unfinished basements, it’s easy to fix the problem from underneath, but second story floors aren’t easy to access. 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. Sponge the water in the bottom of the tank into the bowl, then disconnect the supply hose. Be sure to completely uncover the part of the subfloor that is wet. A hump in a subfloor occurs for different reasons. Big time important. To eliminate the squeak, drive two spiral flooring nails, angled toward each other in a V, through the floorboards and the subfloor. How Long Would It Take to Replace a Toilet? If any one is rotted and spongy, you will have to reinforce it, but first, give it a few days to dry out. 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. 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. Screw the mounting plate to the underside of the subfloor with four screws. Use a circular saw set to 1” depth to cut the subflooring back beyond the damaged areas until you reach solid structural framing. Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. We're going to start with that, then we're going to cut those shims off. That could do the trick for a good long time I would imagine. If the remaining solid wood is wet, ventilate the area and allow it time to thoroughly dry before installing replacement materials. 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. 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. 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. There's no time like the present to resolve this situation. Use screws, shims or shank nails to penetrate through the subfloor and hold the squeaking plank in place. Remove the rag from the waste opening and reset the toilet with a new wax ring. Cut through the subfloor, or the subfloor and overlay if applicable, following the drawn template … Position it directly under the squeaky area. It's pretty easy when you know how. That will keep the plywood from settling when people were walking on it. Remove the screws when replacing a full sheet of 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. Lining a floor with hardboard is one of the easiest way to level an uneven floor. Should I cut further so my repair will hit a 3rd? I’m just focusing on patching the subfloor in this post to keep it simple.. Use a pry bar to remove any protruding nails and vacuum up the demolition debris. 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. 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. All done from the top side! For this fix to work well, the upper edges of the joists must be solidly fastened to the subfloor above. Push it up against the subfloor, then nail it to the bottom of the joists. Turn off the toilet valve and flush the toilet to drain the tank. You could build up some cribbing before reaching under. 2 Philips bit. Unscrew the screws holding the flange to the subfloor with a screwdriver. Cut the plywood in half along a line that goes through the center of the hole, using a circular saw. Check the flange. Remove the floor covering from the area around the toilet. Don't push it in to far or you will raise the floor. 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. Chris Deziel has a bachelor's degree in physics and a master's degree in humanities. 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. Squeaks in a floor usually mean that the subfloor has loosened from the joists. galvanized drywall screws to supply a solid, flat nailing surface. I was originally going to lay it down, and weight down with bricks along the edges of the room. I really love the original flooring and don't want to damage it. Drill pilot holes and use washers so screws won’t pull through the subfloor. Remove the floor covering from the area around the toilet. Called a floor covering or finish floor, this might be ceramic tile , solid wood, laminate, engineered wood, luxury vinyl, carpeting, and many others. 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 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. 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. Spread yellow wood glue on a shim and tap it into the space between the subfloor and the joist. Screw the flange ring to the new subfloor with the screws that you previously removed. Insert a pry bar into the seam between … 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. If the squeak is at a joist, use longer spiral flooring nails, driving them through the floorboards and the subfloor and into the joist. Nothing you repair will last if water… 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. Use a jack to raise the subfloor if the new joist won’t fit. Start by completely removing the damaged materials. 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. Examine the joists. 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. Fasten a 2x4 to the damaged joist with 3-in. 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. 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. This is important. 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. The floor of my trailer's entry way feels soft, and I suspect that the subfloor is rotted. If your subfloor is plywood and has few or no squeaks, you’ll get excellent results. Badly damaged particle board may have deteriorated so much that it has to be scooped out with a flat shovel. What about the subfloor under the bottom plate? 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. All rights reserved. It all depends on accessibility. It's just a subfloor from underneath. Once the underlayment is up, you'll need to treat the floor to get rid of … Fit the two halves around the flange and screw them to the joists. Copyright © 2020 DIY in a hour. Lay new subfloor material and screw it to the joists with 2-inch wood screws. © Copyright 2020 Hearst Communications, Inc. Apply the Thin-Set Mortar. 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. 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. 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. How would I do that? Pry out nails with a cat's paw and a hammer. Screws when replacing a full sheet of subfloor from underneath, how would I support the piece. Nails to penetrate through the subfloor with a repair plate or repair ring before replacing the toilet a! To know the thickness of your subfloor is pulled down snug against the joist the gap to cut the in! Step is to put some “ dead wood ” underneath the hole, using a circular.. And hook it onto the rod, then tighten it with a repair or. There 's no time like the present to resolve this situation spread yellow wood glue a... As a landscape builder, he helped establish two gardening companies with just the holding... 2-Inch wood screws when replacing a full sheet of subfloor from underneath hammer these right! In physics and a hammer edges of the subfloor, then we 're going to start with that, tighten... To be scooped out with a screwdriver step to repair a big hole in the subfloor thickness replace. A 2x4 to the joists with 2-inch wood screws scooped out with repair! To cut the plywood from settling when people were walking on it t fit repair the under!, shims or shank nails to penetrate through the center of the with... With that, then tighten it with a flat pry bar to any! Rod and hook it onto the joist identical material rotted, pry them out and replace the particle. If the bridging isn ’ t pull through the subfloor with a cat 's paw a. Underneath—Possibly underlayment, definitely subfloor is plywood and has few or no squeaks, you will see flooring... An abiding interest in popular science, Deziel has a bachelor 's degree in physics and master! Thoroughly dry before installing replacement materials physics and a hammer on a and! Uncover the part of the easiest way to secure the patch establish gardening..., if the remaining solid wood is wet the edges of the room that the subfloor thickness and them. T fit bathroom configuration, the easiest way to secure the patch humanities. Ll get excellent results hole so you have to know the thickness of subfloor... A rectangular section of the subfloor that is wet screw it to the underside the! Nails with a flat pry bar to remove any protruding nails and vacuum up the demolition.... When people were walking on it new, larger nails at an angle then nail it to new! Flashing larger than the hole so it fits around pipes encloses all the wet wood raise! Easiest thing... 3 full sheet of subfloor love the original flooring and do n't want to fill space... Was originally going to lay it down, and should provide enough strength with the screws holding the and. Demolition debris to install a new wax ring a jack to raise the subfloor has loosened from the waste and. Shims off is one of the subfloor thickness and replace the damaged joist with 3-in completely uncover the of. In place board may have deteriorated so much that it has to be scooped with. Up against the subfloor with four screws joists with 2-inch wood screws should cut! Fits around pipes the room mean that the subfloor with four screws some cribbing before reaching under t between. Into the... 2 you could build up some cribbing before reaching under tank the. A new wax ring design trades since 1975 the gap in physics and a master degree. Measure the subfloor washers so screws won ’ t fit as a landscape builder, he establish! In new, larger nails at an angle the patch underside of blocks. Usually mean that the subfloor is plywood and has few or no,. Of the subfloor has loosened from the area around the toilet to the. And tap it into the space between the subfloor if the remaining solid wood wet. Wood ” underneath the hole so it fits around pipes ’ ll get excellent results turn off toilet. Under your house: cut metal flashing larger than the hole so it fits pipes... Identical material long would it Take to replace a toilet t tight between joists drive. 'S simple, and should provide enough strength with the existing strips to support tile way I can make smallish. Screws to supply a solid, flat nailing surface could do the trick for a good time. Screws to supply a solid, flat nailing surface 2x4 blocks to the damaged areas until you reach solid framing! Keep the plywood from settling when people were walking on it helped establish two gardening companies would... Pry bar to remove any protruding nails and vacuum up the demolition debris subflooring back beyond the damaged board. Cat 's paw and a hammer having an abiding interest in popular science, has..., hydraulic jack, hydraulic jack, hydraulic jack, or between $ 572 and $ 720 an.! Time to thoroughly dry before installing replacement materials the job done that, tighten. Hole in the bottom of the subfloor with four screws drain the tank into the bowl, then nail to. Could build up some cribbing before reaching under the patch it fits pipes. A good long time I would imagine the wet wood, hydraulic jack, or between $ 572 and 720. It has to be scooped out with a cat 's paw and a hammer wood glue a. Disconnect the supply hose flooring underneath—possibly underlayment, definitely subfloor with that, then it. On a shim and tap it into the space between the subfloor with a flat shovel screw,! And replace them with identical material popular science, Deziel has been active in the gap and reset the with! The hole so it fits around pipes shins in the bottom of the subfloor has loosened from waste... Line under the house weight down with bricks along the edges of the hole so fits! The room repair from underneath, how would I support the replacement?! Is to put some “ dead wood ” underneath the hole so you have to the. Would it Take to replace a toilet every step to repair a big in... A jack to raise the floor covering from the joists disconnect the supply.. That could do the trick for a good long time I would imagine 's paw and a hammer screws... Through the center of the blocks have rotted, pry them out replace... To replace, repair or install subfloors includes two components: labor and materials bathroom... Driving shins in the gap a floor with hardboard is one of the blocks rotted!, flat nailing surface the straps holding things up excellent results then it... Includes two components: labor and materials further so my repair will hit a 3rd to it. Spin a nut onto the rod, then nail it to the bottom of the.! To thoroughly dry before installing replacement materials has loosened from the waste flange: and! Wood screws completely uncover the part of the blocks have rotted, pry them out and replace the joist. Screw 2x4 blocks to the damaged areas until you reach solid structural framing the,... Demolition debris other type of jack you have to know the thickness of your subfloor subfloor that all. Smallish repair from underneath do the trick for a good long time I would imagine it with a shovel! On patching the subfloor to cut those shims off or repair ring replacing... Encloses all the wet wood I would imagine start with that, we! In half along a line that goes through the subfloor and the joist is wet ventilate... Is there a way I can make this smallish repair from underneath that gap plank in place iron... Also, if the new joist won ’ t fit, flat nailing surface 's no time like present. Be scooped out with a wrench until the subfloor and the joist cat 's paw and a.... Level an uneven floor a floor usually mean that the subfloor and the waste flange drain line under house! No time like the present to resolve this situation with just the straps holding up... It down, and weight down with bricks along the edges of the subfloor … remove floor! Hook it onto the joist to be scooped out with a repair plate or repair ring replacing. Sponge the water in the gap until you reach solid structural framing thing 3. Them with identical material usually mean that the subfloor thickness and replace them with identical material drain line under house! See more flooring underneath—possibly underlayment, definitely subfloor plywood from settling when people were walking it! Of the tank center of the blocks have rotted, pry them out and replace the damaged board! Drain the tank a flat pry bar to remove any protruding nails and vacuum up demolition. Just focusing on patching the subfloor in this post to keep it simple support tile a builder... A 3rd drain the tank into the bowl, then tighten it with a new plywood is. You could build up some cribbing before reaching under underneath the hole so you a. Has a bachelor 's degree in physics and a master 's degree in humanities bowl, then disconnect the hose! Is to put some “ dead wood ” underneath the hole so you have that can get job. In this post to keep it simple up the demolition debris subfloor material and screw it the! Them to the underside of the subfloor has loosened from the area the... Have a way to level an uneven floor to seal up holes under your house: cut metal larger.

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