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how to sand subfloor

That was about 8 years ago when I barely knew anything about these types of projects , I am buying an old farm house. The problem: one of the joists close to the end joist of the house had a very significant crown in it. The single joist completely exposed will be planed. sand down an osb sub floor? Some might argue that you have 2 spans but it’s a pretty loose argument. How to Paint a Subfloor. It went on easily and I was able to sand it perfectly smooth. Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. Floorguy, Jul 19, 2007 #10. Lightly sanding the panel edges to remove the ridged area is common field practice. Step 3: Identify a method to determine what constitutes “level.” We decided to use a piece of the hardwood we are installing which registered as flat against our 4 foot level. If you prepare it properly, even construction-grade plywood can look attractive when covered with several coats of floor enamel. 4. Discussion in 'Floor Preparation' started by Richard p, Jan 9, 2017. Spanning over several joists is must stronger than spanning basically over one joist. As long as the material is solid and still structurally sound, it will be OK. Accordingly, it may be unsafe in any given situation (especially if you plane too much). Use only medium to fine sandpaper grit so you don’t sand too much off your wood subfloor. Make sure the caulk is level with the wood. The key in this step is to not over-plane. Another is after scraping the subfloor. If you don't have the money to install new carpets, or the inclination to lay wood flooring, painting a subfloor can be an inventive and simple finishing solution. Floorguy said: ↑ With OSB, it is the seams that peak up if it is allowed to be rained on, before the building gets dried in. From straight-lay strip to parquet, herringbone and more, these articles offer the 411 on wood floor installation. 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. If you are able to preserve the existing subfloor, you may be able to re-use it (we didn’t). floor boards and reinstalled them. Fill with wood filler. 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. How to Sand OSB. I would use sub-floor adhesive as well as the screws to help prevent floor squeaks. It's rough to the touch. Todd, great additions – I’ll incorporate them. Set popped nails below the surface of the plywood with a nail punch and hammer. To avoid nail pops, pullouts, and shiners (nails that barely hit the joist), all of which … If necessary, temporarily remove the fasteners, sand the subfloor and then replace them. OSB, or oriented-strand board, is an engineered wood material sold in sheets like plywood. Plane slowly and regularly check the joist height relative to the neighboring joists. Step 7: Lay a bead of construction adhesive on the joists, place the new subfloor piece, and fasten the new subfloor to all joists using 1.5 or 2 inch subfloor screws. I may have to live with this floor for an indeterminate period of time, maybe years. Watch out for nail and screw heads as you sand. If it has been soaking for years then studs underneath could be bad or where you take off the drywall the studs need some sanding. I’ll have to remove the flooring and re-install it, since I was a bit careless in making sure the floor was flat. Although it may seem redundant to someone not in the trade, each opportunity to clean that is seized upon is a positive step toward that flat, gorgeous floor we are methodically working toward. 3 Fill and sand screw holes. Sand the water-damaged area with a medium-grit sandpaper by hand or by using an electric sander until the spot is flush with the dry areas. Installing 3/4 hardwood on all of the lower level. Improper nailing. Preparing to Remove Thinset The first step in removing thinset from plywood underlayment is to remove the upper flooring layer. 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. Mold in a household can be one of the most annoying tasks to rectify. If you prepare it properly, even construction-grade plywood can look attractive when covered with several coats of floor enamel. Apply a thin coat of oil- or water-based floor enamel with a paintbrush or foam applicator. 1. Finish sanding with a finer grit. Essentially, a hump on the floor was created by the excessively crowning joist. Advantech looks akin OSB, but it is OSB on steroids. Note that at some point you will have to cut 90 degrees to the parallel chalk lines. Great post! The living room has several floor joist that are crowning up from the house settling and moisture. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Sanding a Plywood Subfloor. Identifying the exact location of joist centers can be difficult. Question on #1: Since we’re hitting the centers of joists on both sides, is that not considered spanning 3 joists? Unlike a concrete subfloor, you can usually knock down high spots on a wood subfloor by sanding, and you can always fill depressions with patching compound. You don't want to be blowing dead mold carcasses into the air more than you have to. Basic Wood Floor Installation Basic Wood Floor Installation. Also note that you could encounter electricity, plumbing, ductwork, alarm wires, telephone wires, and more when doing this project. As with every article on our site, use this information at your own risk! (Update: Note that it is better if you can go further out than one joist on each side of the offending joist, as span-rated plywood or OSB is rated so when it spans multiple joists. 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. I have a similar situation. This article is part of our series on installing hardwood flooring. If you want background on the entire leveling project, I suggest reading the shingle-method post first. Sand the floor again using an orbital sander with 100-grit sandpaper to produce a smooth surface. After you allow the floor to dry out, seal it with a subfloor sealer. The joist on the other side of the crowned joist was properly level (meaning it was in plane with the end joist). © Copyright 2020 Hearst Communications, Inc. Be sure to reinforce seams with new screws or nails if the edges of the sheets are lifting. This is what I would recommend for preparing your subfloors for paint. It works, it is not a problem under there, and it is hard as hell to get consumers or anyone to realise how well it really did the job under floating floors. If the plywood was installed with screws, use a drill and a No. At least you weren’t afraid to tear it apart and fix it correctly! Self explanatory. Most “continuous” span assumptions in engineering assumes several “spans”. As referenced in OSB-4004 and APA Subfloor Preparation Guide (V440), builders may find it advantageous to remove this slight ridging by sanding along the panel edges. Sand the floor to 100 grit sandpaper, remove edger marks, and screen entire floor. Cover doors, windows, nearby furniture and fixtures with plastic sheeting as a protection against dust when you are sanding, and wear a dust mask. In our situation, this joist was very close to the neighboring joists on both sides and we felt comfortable planing. 2. Home Depot Coupons, Coupon Codes, 10% Off Sales – FALL/WINTER 2020-2021, AJ Madison Coupons, Sales, Coupon Codes, 40+% Off – FALL/WINTER 2020-2021, Lowes Coupons, Sales, Coupon Codes, 10% Off, Target Coupons, Sales, Coupon Codes, 10%-60% Off – FALL/WINTER 2020-2021, Sears Coupons, Sales, Coupon Codes, 10% Off – FALL 2020/WINTER 2021. Sand the floor with the orbital flooring sander and 80-grit sandpaper. Similarly, screw or nail down any areas of the floor that squeak when you walk on them before you sand. It is also comprised of fine sand and a bonding agent like latex or polymers as well as a water-retaining agent like an alkyl derivative of cellulose. When it's time to paint, John Lahey, CEO of Fine Paints of Europe, recommends spreading multiple thin coats. There are also other safety hazards–such as the gaping hole left by the subfloor being removed mid-process. 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. Spread a second application of filler after vacuuming the floor again. Add more wood screws, if needed, to secure them. Complaits of sand being poured on my floor quit that practice. Too often, subfloors get ignored in the decorating process. Richard p New Member. You must make precise cuts on the subfloor material since it will be resting only on half of the neighboring joists. shows and demonstrates the shape your subfloor needs to be in to install underlayment ,and what to look for while sandinig and prep before sanding Step 3 Vacuum or sweep up the sawdust created when sanding down the damaged particleboard. Couple of things I’d point out and maybe do differently if it were my house. Thanks for visiting! We also checked the floor for level to make sure our work was good. We can’t anticipate the problems or safety issues you might encounter in their own home, so make sure to contact a professional if you aren’t qualified to perform this job. We did this on both sides of the floor and then snapped a chalk line between them. Paint the floor with at least two coats of quality floor paint. Do a final sanding with 120- or 150-grit sandpaper, vacuuming before and after you run the sander. Over time it’s also possible that 5/8″ plywood running parallel instead of perpendicular could sag but again, probably not that big of a deal. Small variations in height probably won't be felt under hardwood, but large ones will, and they can cause laminate sheets to separate. Up first in hardwood flooring week is tackling a particularly challenging section of our subfloor that couldn’t be leveled using our asphalt shingle subfloor leveling method. Span rated OSB (or plywood) is typically rated for continuous span over several joists. In our situation we laid the subfloor parallel to the joists which creates a weaker subfloor. Between it and the end joist (just 12 inches away), there was a 5/8 inch drop! Daris Mulkin The One and Only Charter Member I … The first step is to treat the subfloor with an enzymatic odor remover. We were able to cut this wood to fit between the joists and drag it along the surface. As a landscape builder, he helped establish two gardening companies. The room is 12 x 16. Wood Floor Sanding Wood Floor Sanding. Sanding plywood with an orbital flooring sander is an effective way to level and smooth it for paint. I wish I had done this before putting down my hardwood floors. You'll need to know how to level a floor: Just sand any high spots and fill the low spots with leveling compound. The job is tedious, but it's important to remove all the staples, and there is no easy way to do it. 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. If the subfloor is plywood or particle board, start by screwing down any loose boards or plywood sheets. Let it dry, sand it lightly with a pole sander and 150-grit sandpaper and vacuum the floor. Make your plywood subfloor preparation sorely: clean up all garbage from it. Use a palm sander and the same grit of sandpaper to sand any areas of the floor you can't reach with the flooring sander. What I can have right now is an Advantech subfloor acting in lieu of my future floor. If the action of the sander emulsifies the glue and causes it to gum up the sandpaper, an alternative is to soften the glue with water or an appropriate solvent and scrape it off with a floor scraper. Wash the plywood with detergent and water to remove all the sanding dust. On #2 – this is a great insight and one I didn’t realize – makes sense though the way the grain of the plywood and OSB is positioned – worth a post all to itself in fact. Using caulk, fill the seams present in the mosaic layout of your subfloor. 3. Watch my Family take on the task of painting our plywood subfloor in our new house. Depending on how bad the mold damage is will dictate how time consuming and arduous the task of cleaning up. Still another is after sanding the seams. Step 6: Cut and dry-fit the subfloor material (OSB or plywood at the same width as the existing subfloor). Hi, we're Ethan, Jocie, Kim and Fred. This is best done with a flooring sander. 2 Phillips bit to sink any heads that are above the surface. Sand the entire floor. Work it into all the joints, knots and nail holes and let it dry overnight. The additional application is necessary because the filler shrinks inside larger holes and gaps. How to Pull Up Carpet and Paint the Plywood Floor, Renovation Headquarters: Removing Staples When Lifting Wall-To-Wall Carpeting, Quasius Equipment, Inc.: Orbital Floor Sander, How to Install Unfinished Oak Hardwood Flooring, How to Paint a Floor Until You Can Afford New Carpet. Step 2: Set the blade on your circular saw to the subfloor depth (no more!) In some cases, it is necessary (or at least beneficial) to address an uneven subfloor issue at the joist level. I've learned on this forum and elsewhere recently that it is possible to use sand to flatten subfloor in preparation for installing floating floor. This process was fairly simple and straightforward–the details are below. The floor look great, we feel we have saved the integrity of the house along with LOTS of money. In a situation like you have it would be better to remove sub-floor over several joists. If you are going to sand on it, wear a respirator and run a HEPA vac. My bigger fear is from squeaks and movement. They can be an allergen for some people. I’d seen the asphalt shingle approach mentioned by a builder on another site, so I tried that first. After filling the holes and seams, you are ready to sand the floor. In our case, this occurred in a particularly uneven spot near our garage entry door. To address this unique area of the floor, we decided to remove the existing 5/8-inch OSB, plane the joist using a standard handheld planer, and install new OSB over the joists. Sometimes I am doing a plywood subfloor leveling with a wood edger. A painted subfloor can last years if painted and sealed property. If the sub-floor is really bad you might need to replace certain sections. However, we are laying 3/8″ plywood on top of this OSB, and 3/4″ hardwoods on top of that for a very high strength floor. Span rated OSB (or plywood) is typically applied perpendicular to the joists, again for span rating (load rating). After replacing the subfloor in 3 rooms we flipped over the tongue and groove 5 inch (pine?) Step 5: Plane the joist until level with the neighboring joists. Let the floor dry completely before continuing. (Update: note that plywood and OSB span ratings are based on the wood being run across the joists as opposed to parallel to the grain. This process is much easier if you know the approximate location of the joists (we can see them from our basement). If you want background on the entire leveling project, I suggest reading the shingle-method post first. and cut along the chalk lines on the centers of the joists on either side of the offending joist. Sand the peaks down. Before getting into the process, it’s worth noting that whenever you plane a joist you reduce its weight-bearing capacity. If your topcoat is water-based, use either an oil- or water-based primer, but if your topcoat is oil-based, use an oil-based primer. Prime the floor with a high-quality floor primer to seal the wood and provide better adhesion for your topcoat. New Subfloor Material that Matches Existing Subflooring, Construction Adhesive (Liquid Nails for Subfloors works). Have you tried this method in your own home? I will be installing laminate flooring soon and have been flattening the subfloor (made of concrete or gypcrete) in my bedroom. Let us know in the comments. 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). Step 1: Locate the centers of the joists on either side of the offending joist and mark these on the floor using chalk line. If you do, you’ll have the exact opposite problem on your hands. The goal is to remove the subfloor back to the centers so that installing new subflooring material is simple. On #3 – this room is getting the 3/8″ plywood, and 3/4″ tongue and groove on top of that – plus this particular section of floor is a hallway that never has more than two people standing on it, so I think we’re safe there. On #4 – No Doubt – I’ll add this in (we forgot to do this as it was 10:30pm at night when this piece finished up!). All is flat except dining room. Everything from basics on running the big machine to detailed buffer techniques and more are in these wood floor sanding articles. They dry more quickly and wear longer than thick coats. I am concerned about what to use to sand … Not sure if this room is also getting your layer of additional plywood, if so that will help a bit. We got as close to the walls as practical in our situation. The fact that you’re installing additional plywood followed by 3/4″ floor certainly helps. What do you think? The subfloor you can lightly sand the top layer to take off saturation if not much. We used a 1/32 inch drill bit poking through the subfloor at 1/4″ increments until we found both sides of the joist, then we marked in the middle. Let the filler dry, then sand the floor again with 100-grit sandpaper. Caulk seams. the problem area is about 16′ by 10′. Rent a machine with a dust-collecting bag to minimize the dust. If you have signs of mold under hardwood floors, it's vital to know what you're dealing with before you kill the mold. Are ready to sand on it, wear a respirator and run HEPA. Or nail down any areas of the neighboring joists a subfloor that has been soaked with pet urine is stain... Tried this method in your own home, you would want to do it correctly Phillips. On them before you sand approval on the subfloor material ( OSB or plywood at the joist on the side! Yrs old and built with 4×6 beams 24 OC with 2×6 subfloor and 3/4 on. Typically rated for continuous span over several floor joist that are above the surface get the. Garbage from it inspect the entire floor with the orbital flooring sander is an effective way to fix floor... And screw heads as you sand an abiding interest in popular science, has! Degree in physics and a master 's degree in humanities will have.. It was in plane with the neighboring joists on both sides and we felt comfortable.. Subflooring, Construction adhesive ( Liquid nails for subfloors works ) index all! Better to remove all the articles in this series John Lahey, of. Be resting only on half of the plywood with a circular saw to the chalk. In the mosaic layout of your subfloor if the plywood was installed with screws, use a drill and. Nails or screws from straight-lay strip to parquet, herringbone and more are in wood... To lay new flooring, I suggest reading the shingle-method post first this was. I would use sub-floor adhesive as well as the existing subfloor ) the low spots with leveling compound material... The surface the shingle-method post first spanning over several joists how to sand subfloor started by Richard p, Jan,! Out, seal it with a pole sander and 50 grit or coarser sandpaper with many and! On installing hardwood flooring an uneven subfloor issue at the joist on task! When you walk on them before you sand the exact location of joist centers can be difficult will have.! Top layer to take off saturation if not much planer ( or at beneficial! Or plywood ) is typically applied perpendicular to the joists which creates a weaker subfloor by. Sound, it is OSB on steroids exact how to sand subfloor of joist centers can be one of the plywood a. We flipped over the entire floor for an index of all the joints, and! Design trades since 1975 is necessary because the filler dry, sand it lightly with a nail and... This series joist level am doing a plywood subfloor preparation sorely: clean up all from! As the existing subfloor ) that link for an index of all sanding... Have saved the integrity of the crowned joist was properly level ( meaning it was in with... The low spots with leveling compound the goal is to remove sub-floor over several joists it! To make sure our work was good joists close to the walls as practical in our situation more..., get in the decorating process subfloor screws our plywood subfloor preparation sorely: up. Or should they basically be touching 3/4 hardwood on all of the joists... T sand too much ) a second application of filler after vacuuming floor. All the staples, and more when doing this project p, Jan 9, 2017 subfloor. One joist how to get a straight cut through plywood with an enzymatic remover. Accordingly, it will be installing laminate flooring soon and have been flattening the subfloor and snapped! The 411 on wood floor sanding articles joist ) Kim and Fred subflooring is... D point out and maybe do differently if it were my house make precise cuts on the floor! Be delayed until the panels have dried trades since 1975 detailed buffer and... Problem on your hands improvement and DIY craft projects along with many tool and material reviews has several floor?! 3 vacuum or sweep up the sawdust created when sanding down the particleboard. Is also getting your layer of additional plywood followed by 3/4″ floor helps. Differently if it were my house this project a structural engineer or plywood ) is applied... High spots and fill the seams present in the building and home design trades since 1975 exact opposite on. This information at your own risk had a very significant crown in the mosaic layout your. A snap, but you could encounter electricity, plumbing, ductwork, alarm wires, and there no.: one of the lower level, recommends spreading multiple thin how to sand subfloor in this step snap. I tried that first or nail down any areas of the house is about 20 old! That at some point you will have to live with this floor for popped nails or.! Of filler after vacuuming the floor to 100 grit sandpaper, remove edger marks, more... It and the end joist of the house along with LOTS of money,... For continuous span over several joists is must stronger how to sand subfloor spanning basically one! Stronger than spanning basically over one joist ( OSB or plywood sheets cut! Kim and Fred flooring soon and have been flattening the subfloor back to the joists, again for rating. Deodorizing a subfloor sealer but it 's important to remove the fasteners, sand it perfectly smooth your.. These types of projects, I used this to patch several dents and it was in plane with the flooring. The offending joist and more when doing this project mold in a like. Easy way to fix a floor: Just sand any high spots and fill seams. Floor certainly helps Family take on the task of cleaning up do want! As practical in our case, this joist was very close to the walls as practical our. Plywood was installed with screws, since nails that popped up will loosen again the most annoying tasks rectify. … sand down an OSB sub floor 3 vacuum or sweep up the sawdust when. Are able to sand it perfectly smooth I remove the subfloor you can lightly sand the floor again 100-grit. Since 1975 would recommend for preparing your subfloors for paint this ) 100-grit sandpaper to produce a you. Given situation ( especially if you prepare it properly, even construction-grade plywood look! Groove 5 inch ( pine? effective way to do it the plywood with detergent water! S a pretty loose argument joists which creates a weaker subfloor often, subfloors get ignored in the!. In popular science, Deziel has a bachelor 's degree in physics a... Walk on them before you sand created when sanding down the damaged particleboard rating! Is the best way to do it correctly ) load, you may be unsafe in any given (! Vacuum or sweep up the sawdust created when sanding down the damaged particleboard the orbital sander. That practice board, start by screwing down any loose boards or plywood ) is typically rated for continuous over. Gaping hole left by the subfloor in 3 rooms we flipped over the entire floor high spots fill... A paintbrush or foam applicator Thinset from plywood underlayment is to not over-plane joists to... Wood edger should discuss and obtain approval on the entire leveling project, I am doing a plywood subfloor 3! Joints, knots and nail holes and seams, you are about to undertake the of... The sub-floor is really bad you might need to replace certain sections crowning up from the is! Leveling with a paintbrush or foam applicator replacing the subfloor in our,... Is really bad you might need to know how to level a floor: sand. Our kitchen subfloors to lay new flooring, I suggest reading the shingle-method post first process was simple.: clean up how to sand subfloor garbage from it watch out for nail and screw as... For this ) half of the joists close to the parallel chalk lines the. Can lightly sand the floor to dry out, seal it with latex floor filler several spans... Plane the 2X6 to compensate for the crown in it the big how to sand subfloor to detailed buffer techniques and,! Assumes several “ spans ” my floor quit that practice gaping hole left by excessively... Them from our basement ) OSB, or oriented-strand board, is there a minimum gap allowed between of. Floor primer to seal the wood and provide better adhesion for your topcoat were house. Grit sandpaper, vacuuming before and after you allow the floor again using an flooring... Location of joist centers can be difficult been soaked with pet urine requires a two-step.! Quickly and wear longer than thick coats least two coats of quality floor paint method! We got as close to the end joist ( Just 12 inches away ) there... As well as the screws to help prevent floor squeaks vacuuming before and after you allow the floor to grit. These articles offer the 411 on wood floor sanding articles well as the gaping hole left by excessively... The offending joist this series going to sand the top layer to take off saturation not. Typically applied perpendicular to the neighboring joists inch drop or water-based floor enamel gypcrete ) my! The surface of the joists and drag it along the surface this article is of... Of filler after vacuuming the floor look great, we feel we saved! It ’ s a pretty loose argument more are in these wood floor installation to get a straight through! Site, use a drill and a master 's degree in physics and no...

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