It’s not as simple as just ripping it up and starting again. 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. 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. Unfortunately I found out this morning that the subflooring is not only nailed and screwed but is glued (adhesive) as well. Helpful tips on how to pour self leveling concrete over a wood 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. 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" . Do I need to level my subfloor before installing my new flooring? 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. 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. It runs along about a 3’ span over that 1 joist. 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. by Shannon » Wed May 25, 2016 8:03 am, Post 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. 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. I have started to remodel an upstairs bathroom (23 year old house) and find that I have an OSB sub-floor. Joists Span: I measured from the basement wall to the Metal beam that the joists rest on. 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. For this project, we were installing a new floor over an existing wood floor in a building almost 100 years old. Is it something that could be cured by using a power sander on the subfloor? A hump in a subfloor occurs for different reasons. If you have any hills or valleys that are more than that, then you have an uneven subfloor that needs to be corrected. This is something you definitely want to repair to ensure a smooth and even final product. report. I know the subfloor … I'm hoping it's not as bad as I fear. https://www.fema.gov/media-library-data/20130726-1708-25045-9326/chapter7.pdf, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. When nailing down a wood floor, the subfloor should be flat to within 1/4” in 10’ or 3/16” in 6’. I also have the 30# felt to build up low spots. 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. Now, our stove is able to sit level in it's space, as is the refrigerator. 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. We recommend a high quality 3 in 1 underlayment, which will protect against sound, moisture, and minor flaws or imperfections in the subfloor. In that case, knowing how to properly flatten a subfloor before the flooring installation is essential. Because the subfloor is your hardwood flooring’s foundation, the structure must be strong and sturdy. I think he's wanting to get rid of his leftover vinyl from his own project - haha . I have an older 1940's home with 3/4" diagonal plank subfloor. Or do I have to put plywood on top of this first? If you are sure its not cushion backed it should work. Using floor patching compound to level a subfloor. So as I. The subfloor is level and solid. Seems like a sound idea ... what's your take on it ? A well-prepared surface forms your flooring’s foundation, so it’s important to make sure it is level before you install your flooring. You can have a flat floor where all points are in the same plane, but it’s not level. 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. Step 1: Locate the centers of the joists on either side of the offending joist and mark these on the floor using chalk line. There is a leak somewhere from the supply or drain piping in that bathroom, leaking onto the dining room ceiling below. I appreciate the advice. Note: You can also use a belt sander and/or a floor sander to remove high areas by sanding the subfloor itself. Correcting an Uneven Concrete Subfloor Replaced the subfloor, which is now 1/2" lower than the rest of the subfloor in the room. Tiling kitchen - Subfloor has a hump JazMan, Subfloor - 1/4" - the only markings on the wood are " Weyerhaeuser 4-Square". So, how do you fix an uneven subfloor? share. Self-leveling compound is similar to concrete, typically coming in large bags in powder form. Step 1: Test the Integrity of the Structure. Professional installers with whom I’ve spoken estimate that 90% of all remodel projects require evening out a subfloor. It is the responsibility of the flooring installer to assess and address substrate flatness … This job is a good example. I could put down extra nails/staples in those spots, would that work better? No matter what kind of flooringyou’re installing, it’s important to make sure the surface beneath it is level, smooth and flat. This motion strains the tongue and groove connectors. Most subfloors will have low spots that require filling with floor patching compound. In addition, I want to reroute some plumbing, as I'm putting in a clawfoot tub. The tool we are using can be rented at any local tool rental store. by Shannon » Fri May 27, 2016 8:18 pm, Post Thanks again. A plywood subfloor will bridge any minor waves in the existing floor, and leveling compound would help, too. If so, that's a chore that can normally be handled by a homeowner without too much trouble. Here’s how to prepare your wood subfloor so you ensure a successful installation. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. 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. I'm trying to decide what subfloor is best for a basement home gym. Do not use flat bottom gables with scissor trusses. Whether you're planning to replace an existing floor or not, a hump in a subfloor requires removing the problem before it worsens. We used a 1/32 inch drill bit poking through the … As I was running a level across the floor today I noticed a hump in the subflooring over 1 individual joist. 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. Yes! It will find the lowest areas of the floor and work to … A plywood layer is not necessary if you are putting down wood laminate. The process will depend on the type of subfloor and the nature of the problem. 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. This compound can potentially be used on a concrete slab or a wood subfloor, and can be effective with any dips in the floor. 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. 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. You mix it with water in a bucket until it creates a thick paste. We are planning on sanding the floor down, and pulling up the flooring to plane the joist if necessary. I plan on screwing it down along the 16" OC joists to eliminate future deflection. 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. Below, you can sister the joists and add a few adjustable columns to strengthen the joists to handle the additional weight. Floor sanders can be … To level a subfloor for installing laminate, follow the directions above to remove high and low spots. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! Either gonna try and lay laminate as is or have carpet installed. They stress that failing to properly prepare a subfloor is the most common mistake beginners make when laying tile. 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. Do not have the time to rip it up and start again. 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. 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. Level the subfloor first, regardless of type. 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. Right now I've got level concrete as the floor. Get down on your knees and look for daylight under the level or board. Dips in the subfloor often lead to bouncing or flexion in the new flooring. If the moisture in the floor is within acceptable levels, the next suspect on your list is an uneven subfloor. The maximum laminate flooring level tolerance on a subfloor is 3/16 of an inch over a 10-foot span. How to Repair a Hump in the Floor. 7 7. comments. 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. JavaScript is disabled. Moisture is not a concern for the forseeable future as it is a newer but settled home. There is a difference of about 3/8 - 1/2” from that point back to the level area. I have a 5 foot level that I am laying across the floor, and there are some high spots. There are 4 main ways to level an uneven subfloor: 1) Self-Leveling Compound One common option is using self-leveling compounds. There is duct work int that area as well. In this video we are going to show you how to deal with small bumps or high spots in your concrete subfloor. Guess it's one way to recycle rather than going into the landfill. If I center the level on the high spot, then there may be 1/8" or so dip on each side. I have not gone over it with a level yet (have to pull up the carpet first). I've just moved into a 1929 home that has a concrete subfloor in the 2nd floor bathroom. Stretch the chalk line out across the room, both ends should be held on the floor. You can then spread it out on the floor in the affected areas. Pass a long carpenter’s level or straight board across the floor in all directions. Post 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. New Subfloor Material that Matches Existing Subflooring; Subfloor Screws; Construction Adhesive (Liquid Nails for Subfloors works) Steps to Level a Subfloor At the Joists. 67% Upvoted. 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. Helping You to Do It Yourself! hide. For instance, the builder may not have properly installed the subfloors Regardless of the … 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. Using a non concrete floor leveller could also work but be sure it dries very well before installing over it. 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? First we made sure the existing floor was squeak-free, undamaged and still fastened securely to its 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. You will have to make sure your joists can handle the addition of considerably more weight from the plywood subfloor and any floor coverings. save. Need to level a hump in hardwood floor. Identifying the exact location of joist centers can be difficult. Have someone help you with this by holding one end of the chalk line. Noticed a hump in a building almost 100 years old which is now 1/2 & quot ; lower the. Not necessary if you are putting down wood laminate with this by one! Have the 30 # felt to build up low spots, styles,,. 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