Step 5: Plane the joist until level with the neighboring joists. Essentially, a hump on the floor was created by the excessively crowning joist. This process is much easier if you know the approximate location of the joists (we can see them from our basement). Sometimes I am doing a plywood subfloor leveling with a wood edger. 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. Planer (or sander, although planers are better for this). Step 1: Locate the centers of the joists on either side of the offending joist and mark these on the floor using chalk line. Click that link for an index of all the articles in this series. Plane slowly and regularly check the joist height relative to the neighboring joists. Watch my Family take on the task of painting our plywood subfloor in our new house. Sand the peaks down. We were able to cut this wood to fit between the joists and drag it along the surface. The house is about 20 yrs old and built with 4×6 beams 24 OC with 2×6 subfloor and 3/4 plywood on top. If you are going to sand on it, wear a respirator and run a HEPA vac. 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. The subfloor you can lightly sand the top layer to take off saturation if not much. Between it and the end joist (just 12 inches away), there was a 5/8 inch drop! If you want background on the entire leveling project, I suggest reading the shingle-method post first. If this were a high traffic area bearing load, you would want to do it correctly). Spread a second application of filler after vacuuming the floor again. If you have signs of mold under hardwood floors, it's vital to know what you're dealing with before you kill the mold. Too often, subfloors get ignored in the decorating process. I’d seen the asphalt shingle approach mentioned by a builder on another site, so I tried that first. Rent a machine with a dust-collecting bag to minimize the dust. 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. 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. After replacing the subfloor in 3 rooms we flipped over the tongue and groove 5 inch (pine?) This process was fairly simple and straightforward–the details are below. (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. Replace any nails with screws, since nails that popped up will loosen again. 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). Can I remove the plywood and plane the 2X6 to compensate for the crown in the 4×6 beam and then reinstall the 3/4 plywood? My bigger fear is from squeaks and movement. You can see in the picture below that the subfloor has been removed back to the centers of the joist on either side of the crowning joist (you can also see some of the spray foam insulation in the rim joist in the basement through the hole). It's rough to the touch. (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. Finish sanding with a finer grit. In our situation we laid the subfloor parallel to the joists which creates a weaker subfloor. The key in this step is to not over-plane. The additional application is necessary because the filler shrinks inside larger holes and gaps. Any suggestions on how to get a straight cut through plywood with a circular saw? 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. © Copyright 2020 Hearst Communications, Inc. Be sure to reinforce seams with new screws or nails if the edges of the sheets are lifting. The first step is to treat the subfloor with an enzymatic odor remover. As a landscape builder, he helped establish two gardening companies. Depending on how bad the mold damage is will dictate how time consuming and arduous the task of cleaning up. I am concerned about what to use to sand … A painted subfloor can last years if painted and sealed property. 4. 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. 2 Phillips bit to sink any heads that are above the surface. How to Refinish Plywood Subflooring. Sand the floor again using an orbital sander with 100-grit sandpaper to produce a smooth surface. 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!). Caulk seams. 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. First, however, you need to carefully prep it by removing staples and glue, making sure it is adequately secured to the joists and filling cracks and joints. Also note that you could encounter electricity, plumbing, ductwork, alarm wires, telephone wires, and more when doing this project. Daris Mulkin The One and Only Charter Member I … Preparing to Remove Thinset The first step in removing thinset from plywood underlayment is to remove the upper flooring layer. 3 Fill and sand screw holes. Fill with wood filler. Identifying the exact location of joist centers can be difficult. There are also other safety hazards–such as the gaping hole left by the subfloor being removed mid-process. The room is 12 x 16. 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. What I can have right now is an Advantech subfloor acting in lieu of my future floor. Couple of things I’d point out and maybe do differently if it were my house. The fact that you’re installing additional plywood followed by 3/4″ floor certainly helps. How to Paint a Subfloor. I’ll have to remove the flooring and re-install it, since I was a bit careless in making sure the floor was flat. All is flat except dining room. Most “continuous” span assumptions in engineering assumes several “spans”. I would use sub-floor adhesive as well as the screws to help prevent floor squeaks. Small variations in height probably won't be felt under hardwood, but large ones will, and they can cause laminate sheets to separate. You must make precise cuts on the subfloor material since it will be resting only on half of the neighboring joists. 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. This article is part of our series on installing hardwood flooring. OSB, or oriented-strand board, is an engineered wood material sold in sheets like plywood. Not sure if this room is also getting your layer of additional plywood, if so that will help a bit. Advantech looks akin OSB, but it is OSB on steroids. To avoid nail pops, pullouts, and shiners (nails that barely hit the joist), all of which … the problem area is about 16′ by 10′. 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. If you prepare it properly, even construction-grade plywood can look attractive when covered with several coats of floor enamel. 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. If the sub-floor is really bad you might need to replace certain sections. 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. We did this on both sides of the floor and then snapped a chalk line between them. Let the filler dry, then sand the floor again with 100-grit sandpaper. In a situation like you have it would be better to remove sub-floor over several joists. In our case, existing walls prevented this from being accomplished easily, and we were planning to lay 3/8″ plywood on top, and 3/4″ hardwoods on top of that – so we weren’t concerned). 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. Span rated OSB (or plywood) is typically applied perpendicular to the joists, again for span rating (load rating). The living room has several floor joist that are crowning up from the house settling and moisture. Using caulk, fill the seams present in the mosaic layout of your subfloor. I may have to live with this floor for an indeterminate period of time, maybe years. Before getting into the process, it’s worth noting that whenever you plane a joist you reduce its weight-bearing capacity. 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. They can be an allergen for some people. 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. Do a final sanding with 120- or 150-grit sandpaper, vacuuming before and after you run the sander. floor boards and reinstalled them. Inspect the entire floor for popped nails or screws. 3. 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. Accordingly, it may be unsafe in any given situation (especially if you plane too much). 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. I have a similar situation. In some cases, it is necessary (or at least beneficial) to address an uneven subfloor issue at the joist level. Everything from basics on running the big machine to detailed buffer techniques and more are in these wood floor sanding articles. The floor look great, we feel we have saved the integrity of the house along with LOTS of money. The joist on the other side of the crowned joist was properly level (meaning it was in plane with the end joist). Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. The goal is to remove the subfloor back to the centers so that installing new subflooring material is simple. Sanding a Plywood Subfloor. They dry more quickly and wear longer than thick coats. Step 2: Set the blade on your circular saw to the subfloor depth (no more!) This is best done with a flooring sander. Lightly sanding the panel edges to remove the ridged area is common field practice. This is what I would recommend for preparing your subfloors for paint. It went on easily and I was able to sand it perfectly smooth. 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 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. Spanning over several joists is must stronger than spanning basically over one joist. Todd, great additions – I’ll incorporate them. New Subfloor Material that Matches Existing Subflooring, Construction Adhesive (Liquid Nails for Subfloors works). 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. If you are able to preserve the existing subfloor, you may be able to re-use it (we didn’t). Have you tried this method in your own home? Basic Wood Floor Installation Basic Wood Floor Installation. What is the best way to fix a floor that is crowning over several floor joists? 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. Use only medium to fine sandpaper grit so you don’t sand too much off your wood subfloor. Richard p New Member. 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. 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