share. Is it something that could be cured by using a power sander on the 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. 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. report. 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. 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. Self-leveling compound is similar to concrete, typically coming in large bags in powder form. 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. 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. A well-prepared surface forms your flooring’s foundation, so it’s important to make sure it is level before you install your flooring. Do I need to level my subfloor before installing my new flooring? 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 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. I have not gone over it with a level yet (have to pull up the carpet first). The maximum laminate flooring level tolerance on a subfloor is 3/16 of an inch over a 10-foot span. A hump in a subfloor occurs for different reasons. This compound can potentially be used on a concrete slab or a wood subfloor, and can be effective with any dips in the floor. In that case, knowing how to properly flatten a subfloor before the flooring installation is essential. Post To level a subfloor for installing laminate, follow the directions above to remove high and low spots. If so, that's a chore that can normally be handled by a homeowner without too much trouble. 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. The tool we are using can be rented at any local tool rental store. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. by Shannon » Wed May 25, 2016 8:03 am, Post Or do I have to put plywood on top of this first? We recommend a high quality 3 in 1 underlayment, which will protect against sound, moisture, and minor flaws or imperfections in the subfloor. Have someone help you with this by holding one end of the chalk line. Joists Span: I measured from the basement wall to the Metal beam that the joists rest on. 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" . Replaced the subfloor, which is now 1/2" lower than the rest of the subfloor in the room. The subfloor is level and solid. I think he's wanting to get rid of his leftover vinyl from his own project - haha . Now, our stove is able to sit level in it's space, as is the refrigerator. 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. Helpful tips on how to pour self leveling concrete over a wood subfloor. by Shannon » Fri May 27, 2016 8:18 pm, Post I have started to remodel an upstairs bathroom (23 year old house) and find that I have an OSB sub-floor. Unfortunately I found out this morning that the subflooring is not only nailed and screwed but is glued (adhesive) as well. A plywood subfloor will bridge any minor waves in the existing floor, and leveling compound would help, too. When nailing down a wood floor, the subfloor should be flat to within 1/4” in 10’ or 3/16” in 6’. There are 4 main ways to level an uneven subfloor: 1) Self-Leveling Compound One common option is using self-leveling compounds. Can I put LVP (underlayment first) over this type of subfloor? We used a 1/32 inch drill bit poking through the … Identifying the exact location of joist centers can be difficult. You mix it with water in a bucket until it creates a thick paste. Whether you're planning to replace an existing floor or not, a hump in a subfloor requires removing the problem before it worsens. If the moisture in the floor is within acceptable levels, the next suspect on your list is an uneven subfloor. There is duct work int that area as well. 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. https://www.fema.gov/media-library-data/20130726-1708-25045-9326/chapter7.pdf, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. First we made sure the existing floor was squeak-free, undamaged and still fastened securely to its subfloor. Because the subfloor is your hardwood flooring’s foundation, the structure must be strong and sturdy. I know the 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. If you have any hills or valleys that are more than that, then you have an uneven subfloor that needs to be corrected. Floor sanders can be … 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. Wood floors may be installed over subfloors that are out of level, such as a ramp, but should still fall within floor flatness tolerances. Helping You to Do It Yourself! 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. Seems like a sound idea ... what's your take on it ? Step 1: Locate the centers of the joists on either side of the offending joist and mark these on the floor using chalk line. You can then spread it out on the floor in the affected areas. I appreciate the advice. 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. This is something you definitely want to repair to ensure a smooth and even final product. 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. 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. I've just moved into a 1929 home that has a concrete subfloor in the 2nd floor bathroom. In many cases this is logistically easier than trying to remove the subfloor to get at the floor joists. Yes! 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. JavaScript is disabled. Here’s how to prepare your wood subfloor so you ensure a successful installation. If I center the level on the high spot, then there may be 1/8" or so dip on each side. In this video we are going to show you how to deal with small bumps or high spots in your concrete subfloor. It’s not as simple as just ripping it up and starting again. There is a difference of about 3/8 - 1/2” from that point back to the level area. Need to level a hump in hardwood floor. Guess it's one way to recycle rather than going into the landfill. Most subfloors will have low spots that require filling with floor patching compound. 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. Correcting an Uneven Concrete Subfloor Get down on your knees and look for daylight under the level or board. Keep in mind that the goal is not a perfectly level floor. Using floor patching compound to level a subfloor. hide. I also have the 30# felt to build up low spots. It runs along about a 3’ span over that 1 joist. You can have a flat floor where all points are in the same plane, but it’s not level. 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. For instance, the builder may not have properly installed the subfloors Regardless of the … It is the responsibility of the flooring installer to assess and address substrate flatness … I'm hoping it's not as bad as I fear. A plywood layer is not necessary if you are putting down wood laminate. No matter what kind of flooringyou’re installing, it’s important to make sure the surface beneath it is level, smooth and flat. So as I. Tiling kitchen - Subfloor has a hump JazMan, Subfloor - 1/4" - the only markings on the wood are " Weyerhaeuser 4-Square". 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. Below, you can sister the joists and add a few adjustable columns to strengthen the joists to handle the additional weight. 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. 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. As I was running a level across the floor today I noticed a hump in the subflooring over 1 individual joist. Do not use flat bottom gables with scissor trusses. Dips in the subfloor often lead to bouncing or flexion in the new 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. And leveling compound would help, level hump in subfloor put down extra nails/staples in those spots, would that work?! Even final product then you have any hills or valleys that are more than that, then you have OSB. 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