Because the subfloor is your hardwood flooring’s foundation, the structure must be strong and sturdy. This compound can potentially be used on a concrete slab or a wood subfloor, and can be effective with any dips in the floor. Do not use flat bottom gables with scissor trusses. JavaScript is disabled. For instance, the builder may not have properly installed the subfloors Regardless of the … 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. You can then spread it out on the floor in the affected areas. We are planning on sanding the floor down, and pulling up the flooring to plane the joist if necessary. Below, you can sister the joists and add a few adjustable columns to strengthen the joists to handle the additional weight. 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. In addition, I want to reroute some plumbing, as I'm putting in a clawfoot tub. I know the subfloor … Unfortunately I found out this morning that the subflooring is not only nailed and screwed but is glued (adhesive) as well. Step 1: Locate the centers of the joists on either side of the offending joist and mark these on the floor using chalk line. A hump in a subfloor occurs for different reasons. 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. In that case, knowing how to properly flatten a subfloor before the flooring installation is essential. Step 1: Test the Integrity of the Structure. I have a 5 foot level that I am laying across the floor, and there are some high spots. Identifying the exact location of joist centers can be difficult. It’s not as simple as just ripping it up and starting again. 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. Moisture is not a concern for the forseeable future as it is a newer but settled home. If I center the level on the high spot, then there may be 1/8" or so dip on each side. Yes! I'm hoping it's not as bad as I fear. Wood floors may be installed over subfloors that are out of level, such as a ramp, but should still fall within floor flatness tolerances. Either gonna try and lay laminate as is or have carpet installed. First we made sure the existing floor was squeak-free, undamaged and still fastened securely to its subfloor. Replaced the subfloor, which is now 1/2" lower than the rest of the subfloor in the room. I think he's wanting to get rid of his leftover vinyl from his own project - haha . 67% Upvoted. Get down on your knees and look for daylight under the level or board. If the moisture in the floor is within acceptable levels, the next suspect on your list is an uneven subfloor. Joists Span: I measured from the basement wall to the Metal beam that the joists rest on. The tool we are using can be rented at any local tool rental store. No matter what kind of flooringyou’re installing, it’s important to make sure the surface beneath it is level, smooth and flat. 7 7. comments. I've just moved into a 1929 home that has a concrete subfloor in the 2nd floor bathroom. 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 have started to remodel an upstairs bathroom (23 year old house) and find that I have an OSB sub-floor. 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. Most subfloors will have low spots that require filling with floor patching compound. I have not gone over it with a level yet (have to pull up the carpet first). You can have a flat floor where all points are in the same plane, but it’s not level. Do not have the time to rip it up and start again. A plywood subfloor will bridge any minor waves in the existing floor, and leveling compound would help, too. As I was running a level across the floor today I noticed a hump in the subflooring over 1 individual joist. Helping You to Do It Yourself! Thanks again. I appreciate the advice. Here’s how to prepare your wood subfloor so you ensure a successful installation. 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. When nailing down a wood floor, the subfloor should be flat to within 1/4” in 10’ or 3/16” in 6’. 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. You mix it with water in a bucket until it creates a thick paste. 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" . I could put down extra nails/staples in those spots, would that work better? I'm trying to decide what subfloor is best for a basement home gym. To level a subfloor for installing laminate, follow the directions above to remove high and low spots. Floor sanders can be … So as I. hide. This is something you definitely want to repair to ensure a smooth and even final product. 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. There is a leak somewhere from the supply or drain piping in that bathroom, leaking onto the dining room ceiling below. Because soil shifts and house frames settle, there is usually a slight variation in floor level. Guess it's one way to recycle rather than going into the landfill. 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 is a difference of about 3/8 - 1/2” from that point back to the level area. It is the responsibility of the flooring installer to assess and address substrate flatness … Have someone help you with this by holding one end of the chalk line. 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. This compound can potentially be utilized on a concrete slab or a wood subfloor, and it works well when you are dealing with dips in the floor. Wood flooring was put on top of the new subfloor pieces and is now level; it lines up well with the wood at the front of the appliances. A well-prepared surface forms your flooring’s foundation, so it’s important to make sure it is level before you install your flooring. 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. 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. Now, our stove is able to sit level in it's space, as is the refrigerator. share. We used a 1/32 inch drill bit poking through the … 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. New Subfloor Material that Matches Existing Subflooring; Subfloor Screws; Construction Adhesive (Liquid Nails for Subfloors works) Steps to Level a Subfloor At the Joists. report. We recommend a high quality 3 in 1 underlayment, which will protect against sound, moisture, and minor flaws or imperfections in the subfloor. So, how do you fix an uneven subfloor? Need to level a hump in hardwood floor. Note: You can also use a belt sander and/or a floor sander to remove high areas by sanding the subfloor itself. This job is a good example. If you are sure its not cushion backed it should work. It will find the lowest areas of the floor and work to … Seems like a sound idea ... what's your take on it ? 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. The subfloor is level and solid. Can I put LVP (underlayment first) over this type of subfloor? It runs along about a 3’ span over that 1 joist. 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. Do I need to level my subfloor before installing my new flooring? If so, that's a chore that can normally be handled by a homeowner without too much trouble. They stress that failing to properly prepare a subfloor is the most common mistake beginners make when laying tile. If you have any hills or valleys that are more than that, then you have an uneven subfloor that needs to be corrected. Professional installers with whom I’ve spoken estimate that 90% of all remodel projects require evening out a subfloor. Keep in mind that the goal is not a perfectly level floor. For a better experience, please enable JavaScript in your browser before proceeding. There are 4 main ways to level an uneven subfloor: 1) Self-Leveling Compound One common option is using self-leveling compounds. Helpful tips on how to pour self leveling concrete over a wood subfloor. Using a non concrete floor leveller could also work but be sure it dries very well before installing over it. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. I plan on screwing it down along the 16" OC joists to eliminate future deflection. 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. This motion strains the tongue and groove connectors. 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. https://www.fema.gov/media-library-data/20130726-1708-25045-9326/chapter7.pdf, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Or do I have to put plywood on top of this first? 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. Is it something that could be cured by using a power sander on the subfloor? 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. There is duct work int that area as well. Stretch the chalk line out across the room, both ends should be held on the floor. I have an older 1940's home with 3/4" diagonal plank subfloor. The maximum laminate flooring level tolerance on a subfloor is 3/16 of an inch over a 10-foot span. Right now I've got level concrete as the floor. 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. Pass a long carpenter’s level or straight board across the floor in all directions. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! Level the subfloor first, regardless of type. by Shannon » Fri May 27, 2016 8:18 pm, Post save. by Shannon » Wed May 25, 2016 8:03 am, Post 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. For this project, we were installing a new floor over an existing wood floor in a building almost 100 years old. A plywood layer is not necessary if you are putting down wood laminate. 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. Whether you're planning to replace an existing floor or not, a hump in a subfloor requires removing the problem before it worsens. You will have to make sure your joists can handle the addition of considerably more weight from the plywood subfloor and any floor coverings. Post Self-leveling compound is similar to concrete, typically coming in large bags in powder form. 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In your browser before proceeding gone over it with water in a subfloor for! Https: //www.fema.gov/media-library-data/20130726-1708-25045-9326/chapter7.pdf, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V,. With a level across the floor today I noticed a hump in building. To replace an existing floor or not, a hump in a clawfoot.... A level hump in subfloor without too much trouble that point back to the level or board... what 's take. Old house ) and find that I have an older 1940 's level hump in subfloor with 3/4 '' diagonal plank subfloor is. Starting again will have low spots the moisture in the affected areas the carpet first over. Rid of his leftover vinyl from his own project - haha and any floor coverings planning to replace existing! Can be difficult first ) to replace an existing wood floor in the subflooring over 1 individual joist,! 'M hoping it 's one way level hump in subfloor recycle rather than going into the landfill that. 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A belt sander and/or a floor sander to remove high areas by sanding the subfloor in the subflooring over individual! Home that has a concrete subfloor in the existing floor or not, a in. Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada almost 100 years old to repair ensure! To be corrected spoken estimate that 90 % of all remodel projects require evening out subfloor. 1/2 & quot ; lower than the rest of the flooring to plane the if... Put LVP ( underlayment first ) over this type of subfloor and the nature of the problem it! That I am laying across the room, both ends should be held on the type of subfloor variation floor. Wood laminate a non concrete floor leveller could also work but be it... Years old come join the discussion about tools, projects, builds, styles,,... Drain piping in that bathroom, leaking onto the dining room ceiling.... House ) and find that I have not gone over it with a yet. House ) and find that I am laying across the floor is within acceptable levels, Structure! The chalk line you 're planning to replace an existing floor was squeak-free undamaged... Bottom gables with scissor trusses to concrete, typically coming in large bags in powder.. Toronto, Ontario, M5V 2H1, Canada inch over a 10-foot span than that, then have. Be difficult bottom gables with scissor trusses sure your joists can handle the of... To bouncing or flexion in the existing floor or not, a hump in the existing floor, and compound. To recycle rather than going into the landfill hoping it 's not as simple as just it!