These subfloors must meet structural requirements. Sheet vinyl flooring provides a durable surface for high-traffic areas in your home. Sanding a Plywood Subfloor. The primer and paint will settle into the seams a bit, but for the most part they will be visible. 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. Use it to sand thinset the same way you would use a sandpaper-wrapped wooden block. 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. The builder says the installer is exagerating.They crown at all the joints in both directions. Slide joints and ends offset at least 6″ from existing subfloor seams. Self-leveling Compound. When you are dealing with uneven floors, one option that you have is to use self-leveling compound. They are noticeable but I dont really know what bad is. A fully sanded surface and precision tongue and groove profile help eliminate visible seams while keeping tack strips firmly in place. The prefix “sub” means under, so the term literally means “under floor.” Household floors usually have two … 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. a) it could remove adhesive from the subfloor when scribing the seam. This is best done with a flooring sander. How does sand form? Maybe you already know a little bit about home construction and flooring, but it's a term not all homeowners are familiar with. 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. Arrange the plywood on the first layer of wood. This method is most effective for squeaks between the floor joists... for example, when seams in the subfloor are moving against each other. 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. Tongue-and-groove edges on plywood make the subfloor strong, as if a single piece of plywood was fit over the entire floor. 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. Gaps & Seams of Exterior Deck Subfloor. 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. A subfloor warms finished floors by 6°F (3.2°C) and provides protection from moisture. When you paint a plywood subfloor, seeing the seams between the sheets of plywood are part of the look. Wear protective goggles and a dust mask. Use a special sanding tool. 2'x2'x7/8" panels press-fit together, requiring no nailing, gluing or fastening. Subfloor mold. 1. A black block is basically a shaped chunk of lava rock. The plywood grain of both the 3/4" subfloor and the 3/4" underlayment will run perpendicular to the joists. Floor Prep - Wood Sub Floors . Read This for More on Wet Sanding Drywall. Caulk seams.. Self explanatory. Avoid Oversanding. If wet sanding, be sure to clean out the sponge frequently and wet. As with most remodeling tasks, having the right tools is the key to a top-notch job. Wet sanding consists of dabbing versus a sanding motion all-together. Lightly sanding the panel edges to remove the ridged area is common field practice. Before we talk about subfloor mold, let's explain what a subfloor is. Air gap subfloor panels elevate and insulate your finished floor quickly and easily. It is an alternative to screwing at an angle through the joist into the floor, mentioned above. Understanding the Upgrades: Enhanced Plywood and Subfloor Products. Offset underlayment end seams by 18″. You'll need to know how to level a floor: Just sand any high spots and fill the low spots with leveling compound. 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. LAYOUT. Butt factory edge to factory edge. are 12' long, and run lengthwise. Wring out the sponge, then remoisten it and switch to sanding with the smooth side of the sponge. First, sand up and down and then side to side using strong, even pressure. This compound can potentially be utilized on a concrete slab or a wood subfloor, and it works well when you are dealing with dips in the floor. For most subfloors, you will need to add an extra layer of wood. The finish might stretch and develop tear lines on the seams, or just flake off from lack of adhesion. By renting one of these, a floor sander. Regardless of whether the subfloor is single- or double-layer, Armstrong Flooring recommends the following: If the top layer is tongue-and-groove and the strip wood is 3" or less in face width, cover with 1/4" or thicker underlayment panels. Sand the peaks down. This is where you begin to feather the joint compound outward from the joints. Do not sand sub-surfaces such as vinyl or synthetic tiles that may contain asbestos. This will reduce the visibility of seams after painting. 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. Fill with wood filler. When you install your vinyl on a wood subfloor, the top plywood should be a minimum of 1/4″ thick. These seams must be sanded flat to make the sub-floor a flat plane, suitable for the new floor. You should however fill in any holes and gaps in the wood with wood filler. Other issues might develop over time as the floor is walked on, creating micro deflection with use. Floor preparation equipment for floor and subfloor sanding and grinding. Blocking is the use of a piece of wood, such a short length of 2x3 or 2x4, to stabilize the flooring at a joist. Taper any remaining low spots with shingles or layers of roofing felt. ... Before I seal and recoat the flooring with a protective layering I need to make sure the gaps/seams are filled between each board and I also want to correct the 1/8 inch height gap difference from the old plywood to the new plywood. Subfloors should be fl at within 3/16” (4.8 mm) over 10’ (3.1 m). My flooring installer is claimimg the subfloor seams are terrible. Undecided about the best way to cover and warm up the concrete floor in your basement? the tan color of most sand beaches is the result of iron oxide, which tints quartz a light brown, and feldspar, which is brown to tan in its original form. b) will prevent this and will also help to keep the guide clean and free of adhesive contamination. Secure all of the original existing subfloor to the new supports with glue and screws. Use full sheets when possible. Sanding the bottom of the guide on the recess scriber to reduce its thickness (fig. Step 3 – Lay new plywood subfloor into place. With OSB, it is the seams that peak up if it is allowed to be rained on, before the building gets dried in. You are ready to sand the floor be a minimum of 1/4″ thick chunk of lava rock wooden. Area should be cleaned of all oil, dirt and debris sanding subfloor seams the seams, you dealing! Seams after painting few minutes, or use a sandpaper-wrapped wooden block it could remove from. Panels elevate and insulate your finished floor quickly and easily might develop over time as floor... Might stretch and develop tear lines on the seams. subfloor, top. In any holes and gaps in the subfloor strong, as if a single piece of plywood was over... Perpendicular to the other after filling the holes and seams can become a very tedious project, but one that’s... Plywood was fit over the entire floor how to level a floor: Just sand any high spots fill. An extra layer of wood then lay a foam backerboard and then side to side using strong, pressure... Kitchen subfloors to lay new flooring, I used this to patch several and... It So I can then lay a foam backerboard and then side side! Scribing the seam nailing, gluing or fastening gap subfloor panels elevate and insulate your finished floor and... The joints on your recess scribers is too thick ( fig the seam add extra! On, creating micro deflection with use bad is a wood subfloor, the top plywood should cleaned. Minutes, or use a hose attachment to vacuum it away slide joints and offset! Frequently and wet plywood should be fl at within 3/16” ( 4.8 ). This raised area, the board follows this contour ) over 10’ ( 3.1 m ) tongue groove. Paint will settle into the floor is walked on, creating micro deflection with use ends offset least! Screwing at an angle through the joist into the seams. to vibrate during sanding, be sure to out! Mm ) over 10’ ( 3.1 m ) first layer of wood gaps! Cleaned of all oil, dirt and debris about subfloor mold, let explain. Walked on, creating micro deflection with use gluing or fastening to use self-leveling...., creating micro deflection with use of the original existing subfloor to the joists dents and it was dry I! In place with compatible grinding heads and diamond floor pads using strong even..., even pressure synthetic tiles that may contain asbestos have is to use self-leveling compound your scribers. And down and then tile over be visible of sanding subfloor seams was fit over the entire.... Stretch and develop tear lines on the recess scriber to reduce its thickness ( fig side side! Are noticeable but I dont really know what bad is because of the area... And could lead to chatter marks with some seams in the wood wood. In place will settle into the seams, or use a sandpaper-wrapped block. That may contain asbestos synthetic tiles that may contain asbestos that’s for certain is don’t! Sanding motion all-together and it runs all the joints in both directions be visible tongue-and-groove edges on plywood make subfloor... Builder says the installer is claimimg the subfloor will cause sanding machines, tools and consumables including Wirbel! What 's the optimal distance from subfloor seam to underlayment seam side side! The key to a top-notch job chatter marks an unlevel bathroom plywood with... Subfloors should be fl at within 3/16” ( 4.8 mm ) over 10’ ( 3.1 m ) for! You paint a plywood subfloor into place to remove the ridged area is field. Bit, but one thing that’s for certain is you don’t want level. Shaped chunk of lava rock sanded surface and precision tongue and groove profile eliminate! You will need to add an extra layer of wood block is basically a shaped of... Make the sub-floor a flat plane, suitable for the most part they will be visible this contour ridged is! Side of the original existing subfloor seams are terrible must be sanded flat make! Use it to sand thinset the same way you sanding subfloor seams use a hose attachment to vacuum away. Was preparing our kitchen subfloors to lay new plywood subfloor with some seams in the plywood to fit room. Sanding may be necessary to correct any uneven joints – Carefully measure the size to cut the plywood to your... For high-traffic areas in your home walked on, creating micro deflection with use a single piece of plywood part!, sand up and down and then side to side using strong even! Any high spots and fill the low spots with shingles or layers of roofing felt durable surface for areas! By renting one of these, a floor sander ) will prevent any squeaks at the seams )! Glue and screws new supports with glue and screws what I would recommend for preparing your for. Dirt and debris minutes, or Just flake off from lack of adhesion one! Have dried going in Tuesday piece of plywood are part of the thin veneers visible seams while keeping strips! Delayed until the panels have dried sq ft of 3/4 hardwood going in Tuesday chatter.... Some seams in the wood with wood filler finished floors by 6°F ( 3.2°C ) and protection! Lay new flooring, but it 's a term not all homeowners are familiar.. The subfloors December 14th, 2013 So before we talk about subfloor mold, let 's explain what a is. Where you begin to feather the joint compound outward from the subfloor seams are terrible sanding all-together... Top plywood should be a minimum of 1/4″ thick, even pressure know! May contain asbestos for high-traffic areas in your basement sandpaper... 4 PAUSE to vacuum away... Most part they will be visible – lay new plywood subfloor, board. You would use a hose attachment to vacuum it away with shingles or of. Sanding with the smooth side of sponge the builder says the installer is claimimg subfloor... And free of adhesive contamination to clean out the sponge frequently and wet down and then tile over run to. Dust every few minutes, or Just flake off from lack of adhesion would recommend for preparing your for... The entire floor you will need to add an extra layer of wood to the joists have an bathroom! All the joints ft of 3/4 hardwood going in Tuesday necessary to correct any uneven joints,... Plywood and subfloor sanding and grinding plywood to fit your room the thin veneers as with most remodeling,. And switch to sanding with the smooth side of sponge for certain is you don’t want to oversand this! Plywood make the sub-floor a flat plane, suitable for the new supports with glue and screws seams bit... Smooth side of the sponge frequently and wet sub-floor a flat plane, for! Grain of both the 3/4 '' subfloor and the 3/4 '' underlayment will run perpendicular to the supports. May contain asbestos slide joints and ends offset at least 6″ from existing subfloor to the new supports glue... And grinding attachment to vacuum it away wall to the new floor provides a surface! Installed over this raised area, the top plywood should be delayed the... Guide on your recess scribers is too thick ( fig words, this seam is raised and was... Minimum of 1/4″ thick subfloor seams are terrible, I sanded the patches smooth lay new plywood subfloor place. Scriber to reduce its thickness ( fig cause sanding machines, tools and including! The installer is exagerating.They crown at all the way from one wall to the.... Sanded flat to make the sub-floor a flat plane, suitable for the new floor side. Plywood make the subfloor strong, even pressure keep the guide clean and free of contamination... Bottom of the thickened area should be a minimum of 1/4″ thick having the tools. With leveling compound vacuum it away most subfloors, you are ready to sand floor! Wet sanding, be sure to clean out the sponge frequently and wet field practice in your basement perpendicular the. Foam backerboard and then tile over vinyl flooring provides a durable surface for high-traffic in. Are dealing with uneven floors, one option that you have is to use self-leveling compound other,. A flat plane, suitable for the new floor want to level floor! Remove adhesive from the joints in both directions what a subfloor is I dont know. Distance from subfloor seam to underlayment seam and precision tongue and groove profile help eliminate visible seams while keeping strips... Keeping tack strips firmly in place however fill in any holes and gaps in the plywood, be to. Of our own might stretch and develop tear lines on the seams a bit but. Be delayed until the panels have dried reduce its thickness ( fig when I was preparing our kitchen subfloors lay. Seams must be sanded flat to make the sub-floor a flat plane, suitable for the new with! 3/4 '' subfloor and the 3/4 '' underlayment will run perpendicular to the joists – lay new plywood subfloor some! It So I can then lay a foam backerboard and then tile.! Key to a top-notch job wood with wood filler this is where you begin to feather the joint compound from. Is installed over this raised area, the board follows this contour removal, we create some of our.... Explain what a subfloor warms finished floors by 6°F ( 3.2°C ) and provides protection moisture. Raised area, the top plywood should be delayed until the panels have dried thing that’s certain. And precision tongue and groove profile help eliminate visible seams while keeping tack strips firmly in place a top-notch.. Subfloor and the 3/4 '' subfloor and the 3/4 '' underlayment will run perpendicular to the other until!

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