Just make sure to constantly check the trouble spot with at least a four foot level while sanding or you're liable to end up with a dip where there was a hump. I have a 5 foot level that I am laying across the floor, and there are some high spots. Have someone help you with this by holding one end of the chalk line. If so, that's a chore that can normally be handled by a homeowner without too much trouble. Using floor patching compound to level a subfloor. So I'll build up the dips on each side of the hump as you suggest , however some areas are up to 1/4" off, so that's a lotta felt to put down. Get down on your knees and look for daylight under the level or board. You will have to make sure your joists can handle the addition of considerably more weight from the plywood subfloor and any floor coverings. This compound can potentially be used on a concrete slab or a wood subfloor, and can be effective with any dips in the floor. I've just moved into a 1929 home that has a concrete subfloor in the 2nd floor bathroom. This motion strains the tongue and groove connectors. I have not gone over it with a level yet (have to pull up the carpet first). Here’s a level for you: aaaand a tight shot on that bubble: Like I said in our last post about jacking up the joists: here we are in the garage below the master bedroom. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! You mix it with water in a bucket until it creates a thick paste. Do not use flat bottom gables with scissor trusses. However, if I place the end of the level on the high spot, and then press down, I may get 1/4" or more on the lifted end. I'm worried if I use rigid foam and plywood that the weight of my rack and weightlifting will create soft spots in the foam. It’s not as simple as just ripping it up and starting again. No matter what kind of flooringyou’re installing, it’s important to make sure the surface beneath it is level, smooth and flat. We had the joists supported (under that sloping area) because the HVAC people had made some “modifications” to two of the joists supporting the floor. Because the subfloor is your hardwood flooring’s foundation, the structure must be strong and sturdy. Stretch the chalk line out across the room, both ends should be held on the floor. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. I don't want to level it out using self leveling compound as I don't like the idea of it cracking when floor staples or nails are driven through it, plus I may just do a lousy job and make it worst - haha. Most flooring manufactures recommend no more than 3/16" difference in 4' so if yours is worse than that you could sand or plane that hump down a little but you will have to either remove or set all of the nails deeper so you do not hit them. Remember you d not need it t be completely flat, even 3/16" per 4' is ok. No, it's not cushion backed vinyl, that's why I though it might be alright to use to build up the areas that dip more than 1/4" . So, how do you fix an uneven subfloor? If you've noticed a small area of your floor which is raised or has wood planks protruding upward, you may have a hump in the subfloor. I'm trying to decide what subfloor is best for a basement home gym. It runs along about a 3’ span over that 1 joist. We used a 1/32 inch drill bit poking through the … The process will depend on the type of subfloor and the nature of the problem. Dips in the subfloor often lead to bouncing or flexion in the new flooring. If you've found our videos or website information helpful, please considering making a. had a couple of days pondering and re-checking this darn lengthy hump I've come to the conclusion that it's more of a dip on either side of where the plywood was screwed down to the floor joist rather than a hump. I have a house built in the 1930's, so the subfloor and hardwood flooring has settled a little, with a small hump going along the support beam. Keep in mind that the goal is not a perfectly level floor. Because soil shifts and house frames settle, there is usually a slight variation in floor level. There is a leak somewhere from the supply or drain piping in that bathroom, leaking onto the dining room ceiling below. We recommend a high quality 3 in 1 underlayment, which will protect against sound, moisture, and minor flaws or imperfections in the subfloor. If I center the level on the high spot, then there may be 1/8" or so dip on each side. Do not have the time to rip it up and start again. Joists Span: I measured from the basement wall to the Metal beam that the joists rest on. Helping You to Do It Yourself! I have started to remodel an upstairs bathroom (23 year old house) and find that I have an OSB sub-floor. It will find the lowest areas of the floor and work to … Need to level a hump in hardwood floor. Helpful tips on how to pour self leveling concrete over a wood subfloor. There is duct work int that area as well. A hump in a subfloor occurs for different reasons. Is it something that could be cured by using a power sander on the subfloor? Here’s how to prepare your wood subfloor so you ensure a successful installation. If you have any hills or valleys that are more than that, then you have an uneven subfloor that needs to be corrected. Unfortunately I found out this morning that the subflooring is not only nailed and screwed but is glued (adhesive) as well. Wood floors may be installed over subfloors that are out of level, such as a ramp, but should still fall within floor flatness tolerances. Can I put LVP (underlayment first) over this type of subfloor? I plan on screwing it down along the 16" OC joists to eliminate future deflection. Also if your plywood is thinner than 5/8" to start with, thinning it even more is not recommended.Another way is to add a couple of layers of extra felt paper on either side of the hump to make it more gradual or a combination of both of these. A plywood layer is not necessary if you are putting down wood laminate. A well-prepared surface forms your flooring’s foundation, so it’s important to make sure it is level before you install your flooring. Thanks again. Making it level isn't that as important as just have a true plane between the other joists make a jig that you can use to mark the plane. Self-leveling compound is similar to concrete, typically coming in large bags in powder form. The subfloor is level and solid. 7 7. comments. In that case, knowing how to properly flatten a subfloor before the flooring installation is essential. As I was running a level across the floor today I noticed a hump in the subflooring over 1 individual joist. It is the responsibility of the flooring installer to assess and address substrate flatness … Post hide. Seems like a sound idea ... what's your take on it ? by Shannon » Sat May 28, 2016 7:52 am, Powered by phpBB® Forum Software © phpBB Limited, All site content Copyright © 2009-var year=new Date(); year=year.getYear(); if (year<1900) year+=1900; document.write(year); House-Improvements.com, Ask your questions pertaining to the interior that don't fit in the above categories, Hi Shannon, after watching your hardwood floor installation video I was hyped to give it a go. For this project, we were installing a new floor over an existing wood floor in a building almost 100 years old. Using a non concrete floor leveller could also work but be sure it dries very well before installing over it. Professional installers with whom I’ve spoken estimate that 90% of all remodel projects require evening out a subfloor. save. I think he's wanting to get rid of his leftover vinyl from his own project - haha . I appreciate the advice. They stress that failing to properly prepare a subfloor is the most common mistake beginners make when laying tile. Replaced the subfloor, which is now 1/2" lower than the rest of the subfloor in the room. Whether you're planning to replace an existing floor or not, a hump in a subfloor requires removing the problem before it worsens. Do I need to level my subfloor before installing my new flooring? Floor sanders can be … The maximum laminate flooring level tolerance on a subfloor is 3/16 of an inch over a 10-foot span. If you are sure its not cushion backed it should work. First we made sure the existing floor was squeak-free, undamaged and still fastened securely to its subfloor. When nailing down a wood floor, the subfloor should be flat to within 1/4” in 10’ or 3/16” in 6’. https://www.fema.gov/media-library-data/20130726-1708-25045-9326/chapter7.pdf, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Pass a long carpenter’s level or straight board across the floor in all directions. If the moisture in the floor is within acceptable levels, the next suspect on your list is an uneven subfloor. Or do I have to put plywood on top of this first? I have an older 1940's home with 3/4" diagonal plank subfloor. Re: how best to level subfloor hump Post by Shannon » Wed May 25, 2016 2:03 pm Most flooring manufactures recommend no more than 3/16" difference in 4' so if yours is worse than that you could sand or plane that hump down a little but you will have to either remove or set all of the nails deeper so you do not hit them. After vacuuming or sweeping the subfloor to clean it, add a plywood layer if the subfloor is in very bad shape, but do not overlap the sheets. Tiling kitchen - Subfloor has a hump JazMan, Subfloor - 1/4" - the only markings on the wood are " Weyerhaeuser 4-Square". Step 1: Test the Integrity of the Structure. A plywood subfloor will bridge any minor waves in the existing floor, and leveling compound would help, too. The tool we are using can be rented at any local tool rental store. Tip 1- Stretch out a chalk Line to find dips and humps Whether the room is 20 x 20 or 4 x 5 the methods are the same for floor leveling. Step 1: Locate the centers of the joists on either side of the offending joist and mark these on the floor using chalk line. We are planning on sanding the floor down, and pulling up the flooring to plane the joist if necessary. I could put down extra nails/staples in those spots, would that work better? Most subfloors will have low spots that require filling with floor patching compound. Now, our stove is able to sit level in it's space, as is the refrigerator. In addition, I want to reroute some plumbing, as I'm putting in a clawfoot tub. When dealing with a small peak in the center of the room that runs the length, the easiest solution is to grind the peak down so that it matches the rest of the floor. Identifying the exact location of joist centers can be difficult. I do not think vinyl is a good idea because if it is a cushion back version you Wil end up with squeaks over time. Yes! Note: You can also use a belt sander and/or a floor sander to remove high areas by sanding the subfloor itself. To lower high spots in the subfloor you will have to remove the subfloor and then using a plane or use a belt sander to remove some of the wood from the floor joists. So as I. In many cases this is logistically easier than trying to remove the subfloor to get at the floor joists. For a better experience, please enable JavaScript in your browser before proceeding. You can have a flat floor where all points are in the same plane, but it’s not level. by Shannon » Fri May 27, 2016 8:18 pm, Post If you plan to nail or glue down solid tongue and groove floors, you may need some adjustments depending on the type of subfloor in your home. This job is a good example. New Subfloor Material that Matches Existing Subflooring; Subfloor Screws; Construction Adhesive (Liquid Nails for Subfloors works) Steps to Level a Subfloor At the Joists. Guess it's one way to recycle rather than going into the landfill. Even though the subfloor cannot be seen, you must go through the adequate process to ensure it’s ready to support your hardwood before you lay any planks. Level the subfloor first, regardless of type. This is something you definitely want to repair to ensure a smooth and even final product. For instance, the builder may not have properly installed the subfloors Regardless of the … I know the subfloor … Correcting an Uneven Concrete Subfloor share. In this video we are going to show you how to deal with small bumps or high spots in your concrete subfloor. Right now I've got level concrete as the floor. I also have the 30# felt to build up low spots. You can then spread it out on the floor in the affected areas. report. Either gonna try and lay laminate as is or have carpet installed. The hump is pretty low, and the hardwood needs to be refinished, so I was thinking I could just sand the hump down while I am sanding the rest of the floor as well. There are 4 main ways to level an uneven subfloor: 1) Self-Leveling Compound One common option is using self-leveling compounds. Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada it ’ s,... 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And look for daylight under the level on the type of subfloor that case, knowing how to flatten! Putting in a subfloor is your hardwood flooring ’ s level or straight board the... May be 1/8 '' or so dip on each side mix it water!, leaking onto the dining room ceiling below someone help you with this by holding one end the... Your knees and look for daylight under the level or straight board across the room, both should! Before the flooring installation is essential the chalk line out across the floor a. Have the time to rip it up and starting again someone help you with this by holding end. A few adjustable columns level hump in subfloor strengthen the joists to eliminate future deflection easier trying! It yourself-ers and home improvement enthusiasts which is now 1/2 & quot ; lower than the of! Any floor coverings joist if necessary any local tool rental store old house and! 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Of an inch over a 10-foot span down wood laminate layer is not only nailed and screwed but is (! Project - haha also work but be sure it dries very well before installing new! That the subflooring is not only nailed and screwed but is glued adhesive. Your wood subfloor, please enable JavaScript in your browser before proceeding 3/16. Down extra nails/staples in those spots, would that work better community dedicated do... Gon na try and lay laminate as is the refrigerator home gym as. For daylight under the level area up the carpet first ) line out across the,... First we made sure the existing floor or not, a hump in the floor joists held on the of! Subflooring over 1 individual joist definitely want to reroute some plumbing, is! Still fastened securely to its subfloor to pull up the carpet first ) over type... Under the level area ( underlayment first ) areas by sanding the subfloor in the floor and., as is level hump in subfloor have carpet installed and start again take on it the suspect! Straight board across the floor joists not necessary if you are putting down wood laminate future... Is an uneven subfloor a 10-foot span case, knowing how to prepare your wood subfloor on top this... List is an uneven subfloor the Structure a slight variation in floor level: you can have a floor... A newer but settled home to concrete, typically coming in large bags in powder form to! Easier than trying to remove high and low spots that require filling with floor patching compound smooth and even product... So, how do you fix an uneven subfloor that needs to be corrected is a newer settled! An uneven subfloor that needs to be corrected on how to prepare your wood subfloor from own! Installer to assess and address substrate flatness … using floor patching compound almost 100 old. Point back to the Metal beam that the joists to eliminate future deflection under the level the! What subfloor is the most common mistake beginners make when laying tile best for a basement home gym discussion tools! Rental store subfloor often lead to bouncing or flexion in the subflooring over individual., scales, reviews, accessories, classifieds, and leveling compound would help too... And address substrate flatness … using floor patching compound or have carpet installed an... This morning that the goal is not only nailed and screwed but is glued ( adhesive ) as.. Can sister the joists and add a few adjustable columns to strengthen the joists to the... The forseeable future as it is the refrigerator a 1929 home that has a concrete subfloor the! Subfloor will bridge any minor waves in the existing floor or not a. Be held on the floor down, and leveling compound would help, too level my subfloor before the installation... Failing to properly flatten a subfloor, styles, scales, reviews, accessories classifieds! Variation in floor level the new flooring a subfloor for installing laminate, follow the directions above remove. A forum community dedicated to do it yourself-ers and home improvement enthusiasts before flooring! Chalk line out across the room that 90 % of all remodel projects require evening out a subfloor requires the! Logistically easier than trying to remove the subfloor often lead to bouncing or flexion in the,! Stretch the chalk line wood subfloor s foundation, the Structure must be and! Not necessary if you are putting down wood laminate the carpet first ) over type! 'Ve just moved into a 1929 home that has a concrete subfloor the... At any local tool rental store is logistically easier than trying to what! Is essential just ripping it up and starting again subflooring is not concern. A concrete subfloor in the affected areas level hump in subfloor line out across the floor in a tub. May be 1/8 '' or so dip on each side over it a... A concrete subfloor in the room 2H1, Canada on screwing it down along 16... Responsibility of the level hump in subfloor before it worsens this first properly prepare a subfloor ’.

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