Joists are 2X8, 16 in. It appears that the plywood subfloor is bowing upward along the seams where the plywood meets. Low areas that are less than 1/4-inch deep can often be filled with building paper. Step 10. I removed an of the foam insulation. Plywood allows for a much better build-up with lower undulations in the subfloor. If it does you’ll have to post pictures of the room, so it can be addressed prior to the work. The floor may roll a marble and looks to slope now that the carpet has been removed. Fill around the hump with self-leveling compound. Wood subfloors are the preferred type of subfloor for solid hardwood flooring installations. Make sure to remove stray nails or staples. 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). 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. We’ll even deliver your plywood in bulk. Sponsored Links #2 04-07-08, 09:05 PM XSleeper. IMO, the hump will simply telegraph up through. The uneven part of the plywood subfloor runs width of the center of the entire room. This layer is a uniform ¾” thick throughout. 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. 05-30-2007, 07:15 PM. I’ve gotten the following suggestions: 1) lay a new 3/4″ subfloor over top of the first, perpendicular to the first. The joists run from front to back in the house - 18' 2x10's unknown wood, 16 inch's on center. Yeah, mud the tile area, how many sq ft is that? If the shingles create a small hump, the length of the hump in the floor will make it unnoticeable. Does anyone know how to deal with the lip that will be left between the plywood and the existing floor. Plywood is available in many thicknesses (1/8”, 1/4”, 11/32”, 15/32”, 19/32”, 23/32” and 1 1/8”). Sheathing Plywood. That would help some with the mud thickness. If you have 2x10's you should add a 2x4 scab. On concrete, "you grind the high spots and you fill the low spots," says Moore. The plywood subfloor is uneven. Tile doesn't do well on wet and warped wood. I had a water leak under my crawl space which has 3 inches of foam insulation applied to the underside of the sub floor. The subfloor registered from 12% to 17% . Replace any nails with screws, since nails that popped up will loosen again. 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. What we decided to do was to rout down the plywood You can see the uneven line in the pics before and after. How forgiving is vinyl in regard to an unlevel subfloor? Dips or depressions in a subfloor are immediately identified using the six-foot long straightedge. Not sure how well flooring staples will hold in OSB and unless the subfloor is glued down you might end up with squeaks. I think 1 1/4 would be too much. You mean mud the whole floor? If I do this do i need to sister in extra support? OC. ajaake. Group … I have water damage to my floors. 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. The plywood is 1/2 inch higher than the other section. 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. I would like to build up the sub floor in the needed areas with plywood. We considered it… but we just weren’t going to do that. Is there any way I can flatten it? Add more wood screws, if needed, to secure them. I wasn’t even sure how we were going to evenly do that anyway. I also didn’t want to fall through the floor into the garage. In addition, the four foot “butt” joint of the plywood is nailed down the center of a Top Stringer. 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? A damp subfloor can also contribute to nail pops and squeaks. Ratings, Grades & Sizes. However, the support beam where the 2x10's meet (front to back) is right in the middle of the kitchen. 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. Wood Sub floor-If you have a hump in a wood sub floor then a belt sander will be the best tool to use. When leveling floors made of wood, you’ll need to sand down any high spots. Best Sub Flooring Material. Preparation of the sub-floor is crucial to successful installation; the foundation must be solid. Your subfloors play an integral part in the success of your hardwood flooring. I want to do a decent job but as easily as possible. They are easier to work with, but still provide a solid foundation to support your hardwood floors for years to come. 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. Of course you will need to recheck other areas to make sure the tiles are all level. You Don’t want to take too much of the sub floor away, this will weaken the floor. The floor is very unlevel. The kitchen sits on top of the support beam in the basement. We decided to rip out the existing flooring over the hump in an effort to flatten it. the kitchen is currently stripped down to plywood subfloor. I removed the vinyl and replaced the rotting plywood. Unless you add another layer on top to give it it’s strength back. --Plywood subfloor --going to sand down the joins flush--Fill in any cracks and nail holes, etc.--Use a quality 2sided tape on the perimeter and possibly in the walking path If doing the above, would I be "good to go" here without going overboard in applying a leveling compound? ... 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. If the subfloor is plywood or particle board, start by screwing down any loose boards or plywood sheets. Vacuum the subfloor and make sure that all debris, no matter how small has been removed from the surface of the subfloor. Note: Do not add any additional fasteners to the subfloor at this time. Hoping for some advice on a ceramic tile installation over 5/8 plywood subfloor on the second floor of our 1974 split level house. The plywood around one joist in particular is up to 1/2″ high. The engineered wood floor appears ok. 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. Any idea what would cause this, and how it can be remedied? If it's not, you can use shingles to build up any dips. There are a couple of ways: 1. ajaake. The answer depends on whether the subfloor is concrete, or plywood or OSB over wood joists. Preparing the Subfloor Plywood Underlayment should be installed only on a dry subfloor. [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. Marine grade plywood is a smart choice for kitchens and baths regardless if you are planning to tile. The room is a kitchen and a dining area measuring 25' x 15'. 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. The floor is now down to the original plywood subfloor. There are three main areas of concern: structural integrity, a clean, flat and even surface, and moisture content. 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. I am in a 1995 single wide mobile home. Make your selection based on the type of project you’re working on. If a long board is to heavy, hold a taut string across the room at floor level. 05-29-2007, 08:26 PM. 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? I have had a contractor come in and level it from underneath as best as it can be done. Then we covered the entire floor with #15 felt paper and installed hardwood flooring over the new plywood and the existing flooring. What we found is that one technique is to pull up the subfloor and shave down the top of the joist. 2. 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. 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. thanks. I’ve read that laminate flooring can only be installed over flat subfloors. Well, the answer is actually no. This is a ranch home with a full basement in Wisconsin. Our plywood buying guide will help you make the right decision. How do I go about levelling out this section of floor before i start laying tile? Davy. From the basement, I can see that the adhesive used between the joist and the plywood was not used at the seams. Our plywood subfloor is uneven. Step 11. First, make sure your subfloor is nailed down, not screwed. A: High areas, such as peaked joints in the subfloor or other ridges in the wood subfloor can be power-sanded or planed. Q: I have a plywood subfloor with a few high/low spots. if you are laying tile you need to consider upgrading the subfloor to plywood that doesn't soak up water so quickly. Build up from the lowest elevation, using the products that allow for enough incremental elevation gain to get to within flatness tolerance. The plywood subfloor is in good condition. Now I want to lay a quality laminate flooring with underlayment. We’ve been told that laminate flooring requires the floor to be level but that vinyl flooring is more forgiving. 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. I would guess that makes deflection not an issue. Should I remove more foam to be sure. Plywood is sold in various ratings, grades and sizes. "Open grit paper — 20, 16, maybe 12 grit, some rocks, basically"— is typically used on the buffer for grinding, he says. 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). 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. Then, measure the difference between the high points and low points of the floor. Joists are 11.5-12 footers; however, they do have some bearing on top of partition walls below. 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