The plywood grain of both the 3/4" subfloor and the 3/4" underlayment will run perpendicular to the joists. Butt factory edge to factory edge. 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. Floor Prep - Wood Sub Floors . Step 4 – Secure new subfloor … Sand drywall patches and seams can become a very tedious project, but one thing that’s for certain is you don’t want to oversand. I have an unlevel bathroom plywood subfloor with some seams in the plywood. Two layers of 3/4" B/C exterior grade. Air gap subfloor panels elevate and insulate your finished floor quickly and easily. B ut they are supported at 10'. Avoid Oversanding. Blocking is the use of a piece of wood, such a short length of 2x3 or 2x4, to stabilize the flooring at a joist. Use it to sand thinset the same way you would use a sandpaper-wrapped wooden block. Wet sanding consists of dabbing versus a sanding motion all-together. When I was preparing our kitchen subfloors to lay new flooring, I used this to patch several dents and it was great. Sanding the bottom of the guide on the recess scriber to reduce its thickness (fig. Step 3 – Lay new plywood subfloor into place. This is what I would recommend for preparing your subfloors for paint. 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. are 12' long, and run lengthwise. Lightly stagger end seams. This is best done with a flooring sander. Have 2000 sq ft of 3/4 hardwood going in Tuesday. These seams must be sanded flat to make the sub-floor a flat plane, suitable for the new floor. Maybe you already know a little bit about home construction and flooring, but it's a term not all homeowners are familiar with. This step, especially with pre-finished flooring where no sanding will take place after install, is important so there is no visible telegraphing of the raised edge. Floor preparation equipment for floor and subfloor sanding and grinding. Subfloors should be fl at within 3/16” (4.8 mm) over 10’ (3.1 m). This is not the case with regular plywood, which requires a piece of 2-by-6 cut to fit between the joists and nailed in place to brace the seams between pieces of plywood. (This will prevent any squeaks at the seams.) Do not sand sub-surfaces such as vinyl or synthetic tiles that may contain asbestos. Step 2 – Carefully measure the size to cut the new subfloor plywood. By renting one of these, a floor sander. Do … Undecided about the best way to cover and warm up the concrete floor in your basement? Sanding the subfloors December 14th, 2013 So before we start dust removal, we create some of our own. 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. Sand the peaks down. How to Prepare a Subfloor for Vinyl Flooring. In other words, this seam is raised and it runs all the way from one wall to the other. Tip: If the guide on your recess scribers is too thick (fig. Subfloor surface should be cleaned of all oil, dirt and debris. Arrange the plywood on the first layer of wood. LAYOUT. Slide joints and ends offset at least 6″ from existing subfloor seams. Wipe away the dust every few minutes, or use a hose attachment to vacuum it away. b) will prevent this and will also help to keep the guide clean and free of adhesive contamination. I recently bought an used house (20 years old) and after removing the carpet in the living room, I found along one particular seam of the subfloor (I think it’s plywood) the edges are cupping. 2 Attach subfloor with screws. Before we talk about subfloor mold, let's explain what a subfloor is. Once your subfloor is in place inside the van you’ll need to secure it to the metal cargo... 3 Fill and sand screw holes. Use only medium to fine sandpaper... 4 PAUSE. a) it could remove adhesive from the subfloor when scribing the seam. Sheet vinyl flooring provides a durable surface for high-traffic areas in your home. Fill with wood filler. If subfloor prep work is required, “hills” should be sanded down and “valleys” filled with an underlayment patch, developed by a reputable manufacturer for use with hardwood flooring. Step 10 Then we covered the entire floor with #15 felt paper and installed hardwood flooring over the new plywood and the existing flooring. It is an alternative to screwing at an angle through the joist into the floor, mentioned above. The primer and paint will settle into the seams a bit, but for the most part they will be visible. Read This for More on Wet Sanding Drywall. 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