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

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