Level an Uneven, Crowning Subfloor by Planing / Sanding Joists Replace any nails with screws, since nails that popped up will loosen again. Use a self-leveler on low spots and / or sand high spots of wood or concrete. Check your wood flooring manufacturer's recommendations and sand any high spots with a concrete grinder. Prep your subfloor so that it is clean, dry and level within 3/16-inch change per 10 feet. If it was moisture leak that warped the sub floor, then you can cut out an area of subfloor and replace that portion with new sub floor. Make sure to maintain 1/4-inch gaps between the sheets. ft.) except it dipped in some places as much as 2.5"! A B. The wood is made from sawdust or wood chips and glue. Prime floor if needed with a Mohawk acrylic latex primer to prevent over absorption of adhesives, dust containment, and to ensure a better bond of the adhesive to the subfloor. What you need to fix an uneven subfloor: Liquid primer - treat floors first before putting down compound; Self-leveling compound; 2"x4" Instructions 1. Preparation: Ensure the subfloor is clear, clean, and free of debris, with plenty of space to work. Repairing undulations: Sand high spots and use a skim coat floor compound for low spots, surface prep product, like Henry's 547 Unipro universal patch and skim coat. Then they grind the spots down using a walk-behind heavy-duty grinder that . Do not sand vinyl flooring - it may contain asbestos. Make sure to maintain 1/4-inch gaps between the sheets. His crew puts water on the floor to find the high spots. What we found is that one technique is to pull up the subfloor and shave down the top of the joist. Fix the Problem Spots. Add more wood screws, if needed, to secure them. Otherwise, the smells and potential spots will resurface over time. So some shady contractors replaced a beam that was under the house by coming through the top. Back to addressing the high spot. Repeat until all of the floor is gone. You can use a wire brush to clean them out. The easiest way to find out if your floor is out-of-plane is to use the time-honored marble method. Some people advise it, but it's a fool's errand. If you find any low spots, smooth them over using a floor patching compound. Use a trowel to level the compound as much as possible while it is still wet and pliable. Check your subfloor to make sure it is level. Gord . Use builder's felt or shingles stapled to the floor to fill small low spots if you don't want to wait for leveling compound to dry. If a 4-ft. straightedge shows a 1/8-in. - If the high spots are large or there are a lot of them, you might want to rent a random orbital floor sander. Either of these solutions will eliminate the smell and the bleach will also disinfect. Use leveling compound in areas where the dip in the old flooring or subflooring is 1/4 inch or more. Sand was sometimes used underneath floating floors, never under a fastened down floor. I missed a high spot in a small area and to try and level it with a belt sander was a joke. Typically, the floor must be level and uniform within 3/16 inch every 10 feet. Step 4: Level your floor by filling low spots with patching compound and a putty knife. It's magic. Tim, I had a similar problem in my house with the entire first floor,(approx. We considered it… but we just weren't going to do that. If you have any high spots in your subfloor, sand them down using a belt sander. Can I use floor leveler under hardwood? Only use small amounts at a time to prevent quick drying before it is level. Photo 1: Fill and sand the subfloor. Subfloor should be flat and level within 3/16" per 10' radius. 3HP Variable Speed Motor very noiseless and powerful. Lowell Brakey, a Kansas concrete contractor, has developed a slick way of doing this. A grinder can be used to sand down bumps in dried compound. I had very good success using a method similar to your thought on placing shims over the joists except that I laid down a second subfloor over the shims and drove 6" ringshank spikes through the whole thing, then laid down hardwood over it. Place it at the highest spot in the floor and slowly swing it around in a 360 degree circle. If you have a drum sander on hand, this can level out any bumps in the subfloor, but you need to have a steady hand to control this. Also, you should check for subfloor deformities with a level or straight pipe. The issue is that it takes forever in that it dulls the 80 grit sandpaper in no time, dulled my grinder too, and the blade on my electric planer now needs replacing. Steps for Leveling a Subfloor. Long Straightedge Many contractors use a 6-foot level or accurate straightedge to help them locate high and low spots in a subfloor. Use a self-leveler on low spots and / or sand high spots of wood or concrete. High Spots: Use a sander to deal with high spots. Clean everything off the floor. Lowering high spots: 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. High Spots and Bumps in Subfloor If you need to bring down your subfloor, you can try either a hand plane or a power sander. 1h. Examine the floor closely for nails or screws that are loose. I had very good success using a method similar to your thought on placing shims over the joists except that I laid down a second subfloor over the shims and drove 6" ringshank spikes through the whole thing, then laid down hardwood over it. Once it's dry, scrape any ridges and sand away any high spots with a pole sander (Photo 9) fitted with 100-grit sandpaper. If significant wood material need be removed, a $70 electric planer will chew it up like nobody's business. You can see all imperfections best in a darkened room. The price includes: • KIT DUST CONTROL it allows to work "dust . Lump. 525 views Eric Elford Any help is most appreciated. #5 Not Using Underlayment. Attached is a partial mapping of the current subfloor flatness in a corner of the room (the closet area). Do not sand vinyl flooring - it may contain asbestos. We are creating an in-law suite in our basement and ripped out all the carpet. Follow the instructions on the compound and then let it dry for at least 20 minutes. The high spots should be cut down with an electric planer, setting nails first with a quarter inch punch and hammer so the blades don't get chipped or an edger with coarse sand paper. It gives information on the subfloor situation covered in this article, and the steps required to level a subfloor without taking up the existing subflooring material. Now it's flat and ready for your underlayment. If you place one end of the level or straightedge on the benchmark high spot and slowly rotate the level around the floor, you'll discover both low and high spots. Help! I have some high spots on my OSB subfloor that after moving my 6ft level around I see it would be far better to remove or reduce the high spot rather then to put in a filler around it. Feather the filler perfectly smooth with the underlayment. The KIESEL Servoplan S444 needed a diamond grinding stone and an angle grinder to remove the high spot. Test multiple areas using a large level. I purchased 1500 sq feet of Provenza LVP in sweet talker which was supposed to be installed this past Monday. You can rent a concrete grinder for $150 to $200 per day. After hemming and hawing for an hour, the . Dips or depressions in a subfloor are immediately identified using the six-foot long straightedge. Tim, I had a similar problem in my house with the entire first floor,(approx. Depending on the situation, you can either sand down areas of the subfloor that are too high, or install shims beneath the subfloor so that the entire floor is brought up to the same level. Repairing undulations: Sand high spots and use a skim coat floor compound for low spots, surface prep product, like Henry's 547 Unipro universal patch and skim coat. In your low spots depending how low, I would use roofing felt to shim them up. The floor feels solid otherwise. ®. This will cause some humps in the final sub floor itself and should be corrected to insure you don't have a see-saw effect in your home. If the forms are level, you should be able to get the concrete level within 1/16 of an inch this . Also look for high spots, especially at seams. Concrete subfloors must be fully cured, at least 60 days old, and should have minimum 6-mil polyfilm between concrete and ground. Prep your subfloor so that it is clean, dry and level within 3/16-inch change per 10 feet. Any voids under a hardwood floor are also likely to create squeaks you don't want to hear. Depending on the situation, you can either sand down areas of the subfloor that are too high, or install shims beneath the subfloor so that the entire floor is brought up to the same level. A wood subfloor is easy to level by either sanding off the high spots or adding compounds designed to build up the low spots. Fill the seams and depressions with a Portland cement-based floor leveler. On the last row of plywood, rip-cut the sheets to fit the remaining gap, leaving a 1/4-inch gap around the wall. A combination of grinding, sanding, and using a self leveling material will get your floor level for proper installation. If the floor is exposed to rain and or humidity, the tapered . Once the compound is dry, make another sweep with your electric sander to shave down slight differences in the height of the subfloor and even out rough patches. Use medium-grit sandpaper to smooth the area, cleaning thoroughly when you're done. Mix some Cement-All with water, (Cement-All is a high grade cement that is used to fix driveways and stairs, and sticks very well to old concrete, but it must be clean) and fill in the holes with a spatula or trowel. Note any low or high spots. Remove molding and baseboard at the edges so you can get the plywood close to the walls. Floor Sanding Machine AVANTIME SANDER Ideal for prefinished parquet. Fill in low spots with cementitious leveling compound. Advertisement Step 2 Look at the joist. … Plane down slight high points of joists with the planer. Use a self-leveler on low spots and / or sand high spots of wood or concrete. After uninstalling the laminate, for the third time, it was time to get to work leveling the floor out so that the boards would install as they were designed to. Remove the baseboards. The joist underneath the hump may appear thicker than the joist on either side of it because of moisture. floorguy 12 years ago It was in the Kahrs original, floating wood flooring instructions, to use sand as a low spot filler, under the underlyment. You'll need to know how to level a floor: Just sand any high spots and fill the low spots with leveling compound. Sand high spots to eliminate the possibility of telegraphing. How much are you going . 2. Prime floor if needed with IVC FLEX-PRIMA Acrylic Latex Primer to prevent over absorption of adhesives, dust containment, and to ensure a better bond of the adhesive to the subfloor. 01-29-2013, 06:20 AM. With my joist configuration, ditra is supported without additional layers. If it's a high joist, remove the subflooring just where the joist is high. In some cases, it is necessary (or at least beneficial) to address an uneven subfloor issue at the joist level. You would have to very thoroughly saturate a large area to address the issue in the subfloor. Thoroughly vacuum the existing floor, and use a long floor leveler and tape measure to ensure the subfloor is level within 3/16 inch for every 10 feet. is a premium T&G sub-floor that is engineered for strength, durability and overall performance. Fixing a low joist is pretty straight forward: jack it up and sister join another joist to the original one. When particleboard gets wet, it can swell or even disintegrate. Sand or Level Any Deformities. 3. Durastrand pointSIX. Make sure you follow manufacturer's instruction, and perform a moisture test after it has dried, to prevent cupping with your hardwood flooring. If your low spots are a 1/4" or better you might consider redecking the subfloor and fill the low spots before you deck. Leave 1/4-inch gaps between all sheets. Let it dry overnight or as indicated in the manufacturer's instructions. If there are many high spots, or if they are extremely bad, consider renting an orbital sander. Easier to sand down a high spot than fill in all the places lower than it. I and getting ready to install 3/4″ Oak Hardwood in my master bedroom, over a 3/4″ plywood subfloor. Grinding concrete down to level is about the least efficient method of leveling concrete, the best way is to place forms at the correct elevation, then screed with a screed board, which can be a 2x4 (make sure it is dead straight), or a steel angle. I found a high spot on the 3/4" t&g subfloor. Then vacuum. Next, combine either one part vinegar with one part water or 1 part bleach with 3 parts water in the bucket. Do not sand vinyl flooring - it may contain asbestos. Prep your subfloor so that it is clean, dry and level within 3/16-inch change per 10 feet. The low spots will be readily visible under the straightedge. A high joist is a different conundrum. When leveling floors made of wood, you'll need to sand down any high spots. A grinder can be used to sand down bumps in dried compound. The OSB subfloor needs to be 3/4" thick, 5/8" OSB won't cut it without adding on a layer of plywood underlayment. Particleboard is a composite wood that is used to construct furniture, door cores, floors and cabinets. Screw the wood shims into place on top of the joists with a drill and screws to bring the low spots up to the same height as the high spots for an even installation area for the subfloor material. Grinding Down High Spots. Drop a few marbles onto the floor in various areas around the room and . Cut out and replace any damaged subfloor. Use a trowel to level the compound as much as possible while it is still wet and pliable. All high spots that don't meet a 1/4-inch-in-10-foot tolerance have to be removed. It means you have to sand down high spots in the concrete or fill in low spots with a self-leveling compound. Paper Shims and Plywood Strips Minor high spots for hardwood and laminate floor installations are easily fixed with tar paper shims. If the subfloor is plywood or particle board, start by screwing down any loose boards or plywood sheets. In many cases this is logistically easier than . Look for areas where the level doesn't lay flat to identify high and low spots. 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. This is best done with a flooring sander. 3. Before you lay any type of flooring, the subfloor should be flat, and if it's plywood, one way to flatten it is to sand it. My questions is, can I sand down a high spot in the OSB subfloor and not expect issues with adhering the ditra? Or, you can cut out the subfloor, notch the joist below to make the sub floor above flat - but this would weaken the joist a bit. Pinpoint uneven areas. Sand the entire floor. Sand down high spots with the sander. Because laminate flooring is so thin it offer no structural integrity and bends and flexes easily. Obviously, most such unevenness is at a joist, so you'll need to remove the nails first. Nail or screw every 6" along joists to avoid squeaking. I use an edger to sand out smaller ridges in the sub-floor. Leveling subfloor for LVP install. 5 months ago. 1. Only use small amounts at a time to prevent quick drying before it is level. Underlayment is a thin layer of foam that absorbs any small deviations in the subfloor below. Plane down the joist and replace (put back) the subflooring. Continue installing sheets of plywood across the room, attaching them to the floor joists in the same way. If you are installing vinyl planks over a concrete subfloor, you first need to level or sand any deformities. Add Supports. Tip: Do not try to sand down old vinyl flooring, as it may contain asbestos. In our case, this occurred in a particularly uneven spot near our Most wood subfloors are constructed from plywood or particle board. Do not sand vinyl flooring - it may contain asbestos. How to Level a Wood Floor Sub-Floor. In either case, the leveling process will be similar to what herein follows. Steps to Clean the Subflooring: Start by thoroughly vacuuming or sweeping the particle board to remove any loose dust and dirt. If grinding a few spots eliminates having to spend the money and time to use a floor leveling compound, then it should pay for itself, at least in time saved. Instead, remove the pre-existing vinyl flooring entirely if it is not level. Proven in the Pacific Northwest, Durastrand pointSIX features a patented taper on the 4-foot and 8-foot edges that is designed to be effective against edge swell. READ: why does my gray paint look purple How do you shim a wooden floor? 1200sq. It depends on how high the high spot is. - If you are using nails or staples to secure your flooring, do not use the leveling compound—it will crack. Then moisten the floor with water. Is there a quick, low-cost way to do this? Underlayment mix can be used for the low areas. • Any unevenness of more than 3/16 inch over a 10-foot span (5 mm over a length of 3 m) must be leveled . ft.) except it dipped in some places as much as 2.5"! Most flooring manufacturers allow a slight variance for their product, so you may not need to do much work to get the floors ready. High temperatures, humidity, and steam cleaning can all cause a deep-set stain to show itself even after the surface covering has been treated.

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