ajaake. I have had a contractor come in and level it from underneath as best as it can be done. If a long board is to heavy, hold a taut string across the room at floor level. Plywood is sold in various ratings, grades and sizes. How do I go about levelling out this section of floor before i start laying tile? A damp subfloor can also contribute to nail pops and squeaks. You mean mud the whole floor? [Archive] Hump in Subfloor Tile Forum/Advice Board Ceramic Tile Advice Forums - John Bridge Ceramic Tile > ... Or pull the plywood up and drop it down between the joists. The floor may roll a marble and looks to slope now that the carpet has been removed. Our plywood subfloor is uneven. Your subfloors play an integral part in the success of your hardwood flooring. In addition, the four foot “butt” joint of the plywood is nailed down the center of a Top Stringer. From the basement, I can see that the adhesive used between the joist and the plywood was not used at the seams. "Open grit paper — 20, 16, maybe 12 grit, some rocks, basically"— is typically used on the buffer for grinding, he says. Wood subfloors are the preferred type of subfloor for solid hardwood flooring installations. Sponsored Links #2 04-07-08, 09:05 PM XSleeper. Yeah, mud the tile area, how many sq ft is that? Then we covered the entire floor with #15 felt paper and installed hardwood flooring over the new plywood and the existing flooring. If the shingles create a small hump, the length of the hump in the floor will make it unnoticeable. There are a couple of ways: 1. You Don’t want to take too much of the sub floor away, this will weaken the floor. Make sure all of the nails and/or screws that hold the subfloor boards or plywood to the wood joists are flush with or recessed with the top of the underlayment. For example, you could add a 1/2 inch layer of plywood or OSB after you sand the hump down. Moisture, which may accumulate when the sub-floor is exposed to weather during construction, can cause excessive expansion of the dry Underlayment panels if the subfloor is not allowed to dry adequately. I wasn't sure if it was safe to take material off of the top of the joists in the section where the hump is, level it out, and replace the subfloor? To fasten the plywood to the OSB, we considered using a combination of 2″ subfloor screws and construction adhesive (i.e., Liquid Nails for Subfloors). Replace any nails with screws, since nails that popped up will loosen again. The uneven part of the plywood subfloor runs width of the center of the entire room. Hoping for some advice on a ceramic tile installation over 5/8 plywood subfloor on the second floor of our 1974 split level house. What we found is that one technique is to pull up the subfloor and shave down the top of the joist. How forgiving is vinyl in regard to an unlevel subfloor? ... We ran an edger (you can also use a big machine) over the seam where the plywood met the old subfloor to create a smooth transition. Make sure to remove stray nails or staples. A new layer of 5/8-inch or 3/4-inch tongue-and-groove plywood subflooring is like adding a new subfloor over the old to create a stiffer, ... Plan the layout of the plywood sheets so the long dimension of the plywood runs perpendicular to the floor joists. TS-55 to cut the underlayment and plywood, RAS or Rotex to blend the edges, don’t forget the appropriate sand paper (got you 2 tools out of the deal). We’ve been told that laminate flooring requires the floor to be level but that vinyl flooring is more forgiving. Marine grade plywood is a smart choice for kitchens and baths regardless if you are planning to tile. The water eventually came out a electric outlet located three inches off the floor. I want to do a decent job but as easily as possible. However, the support beam where the 2x10's meet (front to back) is right in the middle of the kitchen. On concrete, "you grind the high spots and you fill the low spots," says Moore. We considered it… but we just weren’t going to do that. A: High areas, such as peaked joints in the subfloor or other ridges in the wood subfloor can be power-sanded or planed. The plywood subfloor is in good condition. First, make sure your subfloor is nailed down, not screwed. Dips or depressions in a subfloor are immediately identified using the six-foot long straightedge. Preparing the Subfloor Plywood Underlayment should be installed only on a dry subfloor. If I do this do i need to sister in extra support? I wasn’t even sure how we were going to evenly do that anyway. Step 1 Place a long board at the highest point in the floor, and hold it straight across to discover if your floor is level. Preparation of the sub-floor is crucial to successful installation; the foundation must be solid. thanks. 2. Then, measure the difference between the high points and low points of the floor. This is a ranch home with a full basement in Wisconsin. Davy. When used in flooring, plywood functions as the subfloor that supports hardwoods, tile and carpet floors. Layer 4: The Sub Floor –This is a conventional, ¾” Tongue and Groove (T&G) plywood sheeting that is laid in an alternating pattern/ The length of the plywood runs at a right angle to the length of the Top Sleepers. Plywood allows for a much better build-up with lower undulations in the subfloor. If the subfloor is plywood or particle board, start by screwing down any loose boards or plywood sheets. Build up from the lowest elevation, using the products that allow for enough incremental elevation gain to get to within flatness tolerance. If it's not, you can use shingles to build up any dips. The overall floor may not end up in the same plane, but if you have just one gentle hump that extends over 10 or 12 feet, the naked eye can rarely detect this imperfection. Step 10. I would guess that makes deflection not an issue. IMO, the hump will simply telegraph up through. Should I remove more foam to be sure. Plywood is available in many thicknesses (1/8”, 1/4”, 11/32”, 15/32”, 19/32”, 23/32” and 1 1/8”). Well, the answer is actually no. If it does you’ll have to post pictures of the room, so it can be addressed prior to the work. If you have 2x10's you should add a 2x4 scab. Joists are 2X8, 16 in. We decided to rip out the existing flooring over the hump in an effort to flatten it. Joists are 11.5-12 footers; however, they do have some bearing on top of partition walls below. The answer depends on whether the subfloor is concrete, or plywood or OSB over wood joists. Add more wood screws, if needed, to secure them. OC. The title of this blog is a frequently asked question that tile installers have considered when a concrete or plywood substrate has dips or humps in the floor. Wood Sub floor-If you have a hump in a wood sub floor then a belt sander will be the best tool to use. The plywood around one joist in particular is up to 1/2″ high. It appears that the plywood subfloor is bowing upward along the seams where the plywood meets. That would help some with the mud thickness. The room is a kitchen and a dining area measuring 25' x 15'. Step 11. The floor of my laundry room was three layers of hideous vinyl flooring of various vintages, a layer of 3/4" plywood underlayment (to match the height of the vinyl to surrounding hardwood flooring) and a subfloor of diagonal 1x6ish planks. I’ve read that laminate flooring can only be installed over flat subfloors. When leveling floors made of wood, you’ll need to sand down any high spots. Here’s what you need to know to prepare a wood sub-floor to make sure it is problem-free and has a long and beautiful life. I’ve gotten the following suggestions: 1) lay a new 3/4″ subfloor over top of the first, perpendicular to the first. Fill around the hump with self-leveling compound. This layer is a uniform ¾” thick throughout. What we decided to do was to rout down the plywood I had a water leak under my crawl space which has 3 inches of foam insulation applied to the underside of the sub floor. Vacuum the subfloor and make sure that all debris, no matter how small has been removed from the surface of the subfloor. The engineered wood floor appears ok. The floor is very unlevel. Group … The kitchen sits on top of the support beam in the basement. The subfloor registered from 12% to 17% . the kitchen is currently stripped down to plywood subfloor. I removed the vinyl and replaced the rotting plywood. ajaake. The plywood is 1/2 inch higher than the other section. They are easier to work with, but still provide a solid foundation to support your hardwood floors for years to come. You can see the uneven line in the pics before and after. Unless you add another layer on top to give it it’s strength back. Now I want to lay a quality laminate flooring with underlayment. Ratings, Grades & Sizes. I've never installed hardwood on OSB but have done a few thousand sq ft in my own homes over the last 20+ years on plywood subfloors. Tile doesn't do well on wet and warped wood. Sheathing Plywood. This is generally referred to as “gluing and screwing,” and you’ll see it suggested on some ceramic tiling sites as a method to increase the rigidity of a floor for tile installation. The plywood subfloor is uneven. Grind the hump with a concrete grinder as long as it’s not too high and the slab is thick enough to be structurally sound after grinding. I have water damage to my floors. 05-30-2007, 07:15 PM. Best Sub Flooring Material. I also didn’t want to fall through the floor into the garage. The floor is now down to the original plywood subfloor. Note: Do not add any additional fasteners to the subfloor at this time. Then use a couple of pry bars to distribute force evenly (don't break the plywood) when lifting the floor and insert shims to suppport the low spot. There are three main areas of concern: structural integrity, a clean, flat and even surface, and moisture content. Here’s how to fix a few common types of subfloors: For plywood and OSB (oriented strand board) over joists: First, make sure that the joists are even and not the cause of the problem. Our plywood buying guide will help you make the right decision. Is there any way I can flatten it? I am in a 1995 single wide mobile home. Any idea what would cause this, and how it can be remedied? Hopefully with the hump running down the middle of the room, as I picture it in my head this should not affect door openings to much. Because mortar will stick to the concrete slab and the wood subfloor, and mortar will stick to mortar, then it would only make sense that mortar would work for leveling or patching, right? We’ll even deliver your plywood in bulk. I say 11.5-12 because I never took the whole floor up to measure, and the I think 1 1/4 would be too much. Of course you will need to recheck other areas to make sure the tiles are all level. 05-29-2007, 08:26 PM. The joists run from front to back in the house - 18' 2x10's unknown wood, 16 inch's on center. Q: I have a plywood subfloor with a few high/low spots. Does anyone know how to deal with the lip that will be left between the plywood and the existing floor. Not sure how well flooring staples will hold in OSB and unless the subfloor is glued down you might end up with squeaks. I would like to build up the sub floor in the needed areas with plywood. 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