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. 3. Step 4: Level your floor by filling low spots with patching compound and a putty knife. How to Repair a Concrete Floor: 13 Steps (with Pictures ... You would have to very thoroughly saturate a large area to address the issue in the subfloor. I found a high spot on the 3/4" t&g subfloor. 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. If a 4-ft. straightedge shows a 1/8-in. How to Clean Particle Board Subflooring » How To Clean ... Sand high spots to eliminate the possibility of telegraphing. Flattening wood subfloor question. 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. How much are you going . How can I sand down bumps in a dried ... - DoItYourself.com Thereof, how do you level a wood subfloor? Look for areas where the level doesn't lay flat to identify high and low spots. Make sure you follow manufacturer's instruction, and perform a moisture test after it has dried, to prevent cupping with your hardwood flooring. Use a circular saw to remove the subfloor to expose the high joist. Advertisement Step 2 Look at the joist. 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. Use leveling compound in areas where the dip in the old flooring or subflooring is 1/4 inch or more. Fix the Problem Spots. In many cases this is logistically easier than . Use a self-leveler on low spots and / or sand high spots of wood or concrete. Tip: Do not try to sand down old vinyl flooring, as it may contain asbestos. Most wood subfloors are constructed from plywood or particle board. Note any low or high spots. Sand down high spots with the sander. The OSB subfloor needs to be 3/4" thick, 5/8" OSB won't cut it without adding on a layer of plywood underlayment. It shows a localized 5/8 to 3/4″ max low point when checking with an 8 foot level in the E/W . Help! With my joist configuration, ditra is supported without additional layers. 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. Make sure to maintain 1/4-inch gaps between the sheets. Steps to Clean the Subflooring: Start by thoroughly vacuuming or sweeping the particle board to remove any loose dust and dirt. 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 not level, sand down high spots and fill low spots with a Portland Based leveling patch. A B. … Plane down slight high points of joists with the planer. If the forms are level, you should be able to get the concrete level within 1/16 of an inch this . Sanding seams is necessary on most jobs due to the tendency of OSB to swell at the edges (coincidentally known as edge-swell) when exposed to rain, snow, or construction-related moisture introduced during the construction process (which also reiterates the need to check the moisture of the subfloor before installation). In my previous videos you can find some tips on how to level a plywood subfloor with grin. 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. Use a trowel to level the compound as much as possible while it is still wet and pliable. 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. CLICK THE IMAGE NOW TO ORDER IT. The in-law kitchen cabinets have been installed. Power Tools To Fix. It's magic. On the last row of plywood, rip-cut the sheets to fit the remaining gap, leaving a 1/4-inch gap around the wall. Leveling high spots in concrete or wood subfloor I missed a high spot in a small area and to try and level it with a belt sander was a joke. Drop a few marbles onto the floor in various areas around the room and . If the subfloor is plywood or particle board, start by screwing down any loose boards or plywood sheets. All high spots that don't meet a 1/4-inch-in-10-foot tolerance have to be removed. 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. Remove the baseboards. One great tool that works well to remove minor high spots is the use of a flooring edger. Ok- depending on how uneven and how much square footage, and with all the "there's zero way a super pro job would do it this way: Once in an old building renovation we used paint. Once dry, sand it down with sandpaper and sweep again. - If the high spots are large or there are a lot of them, you might want to rent a random orbital floor sander. The holes have to be very clean. 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. 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. Dry Leave 1/4-inch gaps between all sheets. Once I went through that task, I never missed a high spot again. Next, combine either one part vinegar with one part water or 1 part bleach with 3 parts water in the bucket. Steps for Leveling a Subfloor. Use a self-leveler on low spots and / or sand high spots of wood or concrete. Do not sand vinyl flooring - it may contain asbestos. Now it's flat and ready for your underlayment. Note: You can also use a belt sander and/or a floor sander to remove high areas by sanding the subfloor itself. In our case, this occurred in a particularly uneven spot near our Add more wood screws, if needed, to secure them. Use leveling compound in areas where the dip in the old flooring or subflooring is 1/4 inch or more. Is there a quick, low-cost way to do this? Clean everything off the floor. Subfloor should be flat and level within 3/16" per 10' radius. Make sure you follow manufacturer's instruction, and perform a moisture test after it has dried, to prevent cupping with your hardwood flooring. A high joist is a different conundrum. A grinder can be used to sand down bumps in dried compound. 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. Do not sand vinyl flooring - it may contain asbestos. Typically, the floor must be level and uniform within 3/16 inch every 10 feet. A combination of grinding, sanding, and using a self leveling material will get your floor level for proper installation. Feather the filler perfectly smooth with the underlayment. 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. Because laminate flooring is so thin it offer no structural integrity and bends and flexes easily. Sand was sometimes used underneath floating floors, never under a fastened down floor. It means you have to sand down high spots in the concrete or fill in low spots with a self-leveling compound. Particleboard is a composite wood that is used to construct furniture, door cores, floors and cabinets. Then moisten the floor with water. If it's a high joist, remove the subflooring just where the joist is high. On the last row of plywood, rip-cut the sheets to fit the remaining gap, leaving a 1/4-inch gap around the wall. Step 5: Use a belt sander to reduce high spots. Obviously, most such unevenness is at a joist, so you'll need to remove the nails first. 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. His crew puts water on the floor to find the high spots. Deflection is measured using your 6' level and laying it (centered on the high spot) and holding one END of the level to the subfloor. Let it dry overnight or as indicated in the manufacturer's instructions. High Spots: Use a sander to deal with high spots. ft.) except it dipped in some places as much as 2.5"! The price includes: • KIT DUST CONTROL it allows to work "dust . I and getting ready to install 3/4″ Oak Hardwood in my master bedroom, over a 3/4″ plywood subfloor. Lowell Brakey, a Kansas concrete contractor, has developed a slick way of doing this. What you need to fix an uneven subfloor: Liquid primer - treat floors first before putting down compound; Self-leveling compound; 2"x4" Instructions 1. Sand high spots to eliminate the possibility of telegraphing. If there are many high spots, or if they are extremely bad, consider renting an orbital sander. If you are installing vinyl planks over a concrete subfloor, you first need to level or sand any deformities. Instead, remove the pre-existing vinyl flooring entirely if it is not level. I use an edger to sand out smaller ridges in the sub-floor. Either of these solutions will eliminate the smell and the bleach will also disinfect. Durastrand pointSIX. Manufacturers use particleboard because it is less expensive than plywood. Preparation: Ensure the subfloor is clear, clean, and free of debris, with plenty of space to work. 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. The low spots can be marked for filling using the straight-edge after this step. What we found is that one technique is to pull up the subfloor and shave down the top of the joist. Concrete subfloors must be fully cured, at least 60 days old, and should have minimum 6-mil polyfilm between concrete and ground. This is best done with a flooring sander. Since the cause of most squeaks is a loose subfloor rubbing up and down against nails, drive wood screws into the joists below to tighten up the subfloor. Gord . You can use a wire brush to clean them out. Then vacuum. Attached is a partial mapping of the current subfloor flatness in a corner of the room (the closet area). In your low spots depending how low, I would use roofing felt to shim them up. We considered it… but we just weren't going to do that. When leveling floors made of wood, you'll need to sand down any high spots. The wood is made from sawdust or wood chips and glue. 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. Continue installing sheets of plywood across the room, attaching them to the floor joists in the same way. Use a self-leveler on low spots and / or sand high spots of wood or concrete. Dips or depressions in a subfloor are immediately identified using the six-foot long straightedge. 1h. 1200sq. Sand or Level Any Deformities. You can see all imperfections best in a darkened room. #5 Not Using Underlayment. Leveling subfloor for LVP install. Some people advise it, but it's a fool's errand. Continue installing sheets of plywood across the room, attaching them to the floor joists in the same way. Long Straightedge Many contractors use a 6-foot level or accurate straightedge to help them locate high and low spots in a subfloor. Easier to sand down a high spot than fill in all the places lower than it. Fixing a low joist is pretty straight forward: jack it up and sister join another joist to the original one. Step 1: Determine and mark high and low spots across the floor. Do not sand vinyl flooring - it may contain asbestos. The KIESEL Servoplan S444 needed a diamond grinding stone and an angle grinder to remove the high spot. Make sure to remove stray nails or staples. 1200sq. Do not sand vinyl flooring - it may contain asbestos. The low spots will be readily visible under the straightedge. 525 views Eric Elford How to Level a Wood Floor Sub-Floor. If you are nailing the hardwood floor in place, choose cementitious leveling compound that you can nail through. Prep your subfloor so that it is clean, dry and level within 3/16-inch change per 10 feet. 3. The floor feels solid otherwise. 1) Sanding high spots on a wooden floor is crazy. Back to addressing the high spot. 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. Use a self-leveler on low spots and / or sand high spots of wood or concrete. Only use small amounts at a time to prevent quick drying before it is level. Place it at the highest spot in the floor and slowly swing it around in a 360 degree circle. Only use small amounts at a time to prevent quick drying before it is level. 01-29-2013, 06:20 AM. Measure the height difference at the other end of the level (the end with the gap between the subfloor and the level). 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. - If you are using nails or staples to secure your flooring, do not use the leveling compound—it will crack. Also, you should check for subfloor deformities with a level or straight pipe. If significant wood material need be removed, a $70 electric planer will chew it up like nobody's business. Sand the entire floor. Now, use the circular saw to cut along the next joist, so you can lift out another strip of plywood/cement board/ self leveling. We are creating an in-law suite in our basement and ripped out all the carpet. Pinpoint uneven areas. Tim, I had a similar problem in my house with the entire first floor,(approx. Underlayment mix can be used for the low areas. When they replaced the subfloor they didn't have it level and . Make sure to maintain 1/4-inch gaps between the sheets. Cut out and replace any damaged subfloor. Use a wet-vacuum to clear up dust and debris and use a level to be sure all the low spots are gone. Check your subfloor to make sure it is level. Paper Shims and Plywood Strips Minor high spots for hardwood and laminate floor installations are easily fixed with tar paper shims. Leave 1/4-inch gaps between all sheets. If you find any low spots, smooth them over using a floor patching compound. I purchased 1500 sq feet of Provenza LVP in sweet talker which was supposed to be installed this past Monday. Once it's dry, scrape any ridges and sand away any high spots with a pole sander (Photo 9) fitted with 100-grit sandpaper. Plane or sand high spots using a wood planer or hand sander. So some shady contractors replaced a beam that was under the house by coming through the top. Otherwise, the smells and potential spots will resurface over time. Plane down the joist and replace (put back) the subflooring. 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. For concrete slabs: If there are only a few problem areas in the concrete, you can mechanically flatten them by grinding, bead-blasting, abrading, or using . 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. ®. Instructions Remove the baseboards. You can rent a concrete grinder for $150 to $200 per day. Any help is most appreciated. Nail or screw every 6" along joists to avoid squeaking. You want the joist at the same height as the other ones. Prep your subfloor so that it is clean, dry and level within 3/16-inch change per 10 feet. 5 months ago. is a premium T&G sub-floor that is engineered for strength, durability and overall performance. As it dries, sand down any high spots to make them flush with the rest of the subfloor. 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. Also look for high spots, especially at seams. Sand from one end of the room to the other, pushing the sander along in a straight line and reversing your direction each time you reach the opposite wall. Prep your subfloor so that it is clean, dry and level within 3/16-inch change per 10 feet. If the subfloor is unlevel, you can fix low spots with a self-leveling product and sand or grind down high spots. Grinding Down High Spots. READ: why does my gray paint look purple How do you shim a wooden floor? In either case, the leveling process will be similar to what herein follows. If you have any high spots in your subfloor, sand them down using a belt sander. The compound will break out or crumble, with the vibrations from nailing a floor down. Follow the instructions on the compound and then let it dry for at least 20 minutes. ft.) except it dipped in some places as much as 2.5"! 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. If you need to remove adhesive. Professional sanding machine with Variable Speed motor and integrated dust extraction especially designed for prefinished parquets. 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. Use medium-grit sandpaper to smooth the area, cleaning thoroughly when you're done. High temperatures, humidity, and steam cleaning can all cause a deep-set stain to show itself even after the surface covering has been treated. 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. 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. Check your wood flooring manufacturer's recommendations and sand any high spots with a concrete grinder. Fill any low spots with a cementitious leveling compound following the manufacturer's directions and allow it to dry before proceeding. Fill in low spots with cementitious leveling compound. 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