This is particularly important if your old sub floor has lumps and bumps in it. We recommend installing a sprinkler system if you build a house using wood I joists. There are unique challenges in every plywood subfloor installation, including important building codes specific to your area that no single article could completely address. This span rating for plywood defines how far apart joists can be. For subflooring, you use tongue and groove plywood. We dry-fitted the plywood over the shims to make sure the new subfloor was even with the rest of the flooring. It is exceedingly important that the first whole line of plywood sheets be perfectly straight and square. Don’t stack too much plywood on the same set of joists and overload them.https://c530a180aaf435517e4010cd1acc3002.safeframe.googlesyndication.com/safeframe/1-0-37/html/container.html. How far apart should the joists be, both side-to-side and front-to-back? Chalk lines are pulled all the way across all the joist tops at the 4 foot marks so we can check our accuracy with each sheet of plywood being attached to the joists. Some plywood subfloors deflect more than others. For hardwood floors, use some felt layer over the plywood underlayment for better results. Carhartts are the new fashion accessory! Charlie: Or super glue. Here's wishing plywood was like 45" wide, or I was like three inches taller. The subfloor is typically made from plywood or oriented strand board (OSB). NOTE: This is Part 1 of a 2 part series. This also applies to joists depth. This video covers measuring cutting and the correct tricks for installing to ensure a good bond and long lasting results that never squeak. Make sure no one is standing below so the pieces can fall freely to the ground. Install one sheet of plywood at a time. We can say that our subfloor feels super sturdy! Select the smooth side of the plywood to be facing up. Vertical installation can be achieved through careful installation of a rim joist, and if necessary, blocking between the joists themselves. Step 4 Repeat Steps 2 and 3 to install … The second (top) layer of plywood joints should not coincide with the joists and the second layer should not be fastened to the joists. The wood i-joists are more forgiving than traditional joists because they have a wider nailing flange. Dry fit components first to make sure sheets land on the center of joists. Another approach would be to completely cover the project with large tarps in between efforts. Conclusion. New sheets are carefully pounded in place with a block protecting the open groove side of the plywood. Remember, plywood only has a tongue and groove on the sides, not on the edges, since these will be nailed into the joist. Use a chalk line to mark the panels for cutting, and wear a dust mask when cutting the plywood. The wood grain of the panels should be perpendicular to the floor joists. Fasten your first layer plywood subfloor as you normally should. It has been torture waiting for plywood day! We started first with a 1/2 sheet. Tom: You could use that but I don’t think I would. Step 3: Lift up the plywood and put construction adhesive across the joists. Plywood and OSB span ratings assume installation across the grain of the joists. Later this week we will be showing wood I-joist installation, both with a rim joist, and without, in a situation where a rim joist cannot be installed due to the position of the wall next to an adjacent house. Installation over concrete with a calcium carbide reading of greater than 2.5 percent. Not exactly a Melissa and Doug puzzle! Re-secure any loose wood subfloor planks, OSB, or plywood subfloors to the floor joists using 2-1/2" deck screws. The rings help to keep the nails from easily popping out (creating a potentially squeaky floor). ⚛ The information about How To Install Plywood Subfloor Over Joists Easy Steps For Installation is completely presented here. C-D plywood is made from thin sheets of veneer that are laminated and then glued together forming a 4 foot by 8 foot sheet of plywood. This site uses Akismet to reduce spam. Charlie: Okay. Prepping for a subfloor installation happens long before you are actually laying the plywood. After each sheet of plywood is layed down, I went and marked the open edge, with a mark centered on the open floor joist. It was getting pretty late when we finally finished up. In this installation, we used Portable Cable’s Round Head framing nailer. There are also other trades between. On the four foot edges, your seams will fall on joist tops, so no need for tongue and groove. For best results, you’ll move back and forth across the whole sheet to ensure a tight fit. Copyright 2009-2011 Ana White/Ana White.com. So it is critical that the second sheet of plywood stagger those weaks spots to get maximum rigidity in the floor prior to tiling. Although OSB (orient strand board) is sometimes used, the most commonly used type of wood is C-D grade tongue and groove plywood. Learn how your comment data is processed. Step 2: Measure and dry-set the first piece. You likely won’t be able to push the plywood into place by hand. Also, these joists are not as safe in a fire. Plywood sheets are laid perpendicular to the subfloor, with no common joints and no adhesives between the layers. If you did this without a block, it would destroy the groove and make fitting the next row of plywood very difficult. Never go longer unless you have rechecked the spanning distance on the plywood and joists you are installing, as this could create a weak spot in the floor. Also, donâ t forget to wear proper safety And this is how we lay the subfloor on top of those floor joists ... On the tops of the floor joists, we measure and mark every 4 feet - this will be the plywood seams. Then when we went to put the remaining piece in, everything keeps to the pattern, fitting just right, like a perfect puzzle, only the pieces are 48" x 96" and weigh 90 pounds. The second (top) layer of plywood joints should not coincide with the joists and the second layer should not be fastened to the joists. You will notice that there is maximum flexing at the areas between the floor joists where two sheets of plywood meet. It's what makes a pile of boards and materials into a solid structure. Things to take into account when laying ply over plank subfloors: Take time to make sure your existing planks are well secured in place. You can see in this picture that the plywood sheets making up the subfloor in this house are tightly joined together. Step 2: Measure and dry-set the first piece. It’s important to note that when installing the plywood sheets, do NOT nail within 10 inches of the side closest to the tongue UNTIL the adjacent sheet is hammered in. Step 9: At this point, the plywood subfloor is complete. Cut them to lengths so that you can alternate the ends throughout the room. Errors tend to compound as you work through these steps. Make sure your contractors are careful through each stage. (See our wood joist comparison.). That’s basically how to install plywood underlayment. Where floor joists are spaced 16 inches on-center, whether or not a 3/4-inch plywood subfloor is adequate for this type of installation is a judgment call. How To Install A Subfloor. You do it on the top of the joists and then you put the subfloor down on the joists and glue it and nail it and screw it and that glue will bond it down, construction adhesive. How to Cut the Subfloor to Access the Floor Joists for Plumbing. you are such an inspiration .. just amazing. We did this by simply starting with a 1/2 sheet of plywood on the first row, followed by a full sheet of plywood on the next row. The floor of any building or structure is its base and one of the most important parts, so when preparing to lay a plywood subfloor there are several things to keep in mind. Who knew?! It aids during installation if the joists are installed exactly 16 inches on center throughout the floor. Liquid Nails for Subfloors is a common product for this job. I knew that overall, the finished product would be far more level and feel more solid. Step 1: Get the plywood to the right level of the house. But we are enjoying it now! We shared the day with a dozen volunteers, working primarily on structural components of the house, including installing floor joists, installing a 3/4 inch plywood […] Did you leave any expansion gaps between the short ends of the plywood? To install a floated subfloor system, first place a layer of plywood subfloor panels with the edges parallel to the wall. This is made easier if you have a caulk gun designed for subfloor installation like the one shown below. Repair any broken planks. If you tighten the plywood down to the joists near the edge, it is much more difficult to install the sheet. The first thing to consider is what type of wood to use for the subfloor. (I'll be blogging about all the other projects we've been up to as well in the next coming bit). Then I traced a line to the mark I had made on the previous sheet of plywood, making it easy to find the joist and nail the plywood to it. Laying your first piece in the outside corner of the floor you want the long dimension of the plywood to lay across six joists with the final edge ending up in the center of the 6th joist. When you build, you always stagger. You should leave these nails about 3/4″ out of the plywood to make pulling them easy if everything isn’t right. Make sure that the foundation is square, that the first floor walls are square, and that the joists are square. How to Install a Subfloor on Joists Submitted by Ana White on Thu, 10/13/2011 - 00:50 We put the upstairs floor joists up, and I thought the very next day I'd be getting a sun tan on a roof top deck. We are using ring shank nails, or nails with rings on their shanks. Be sure the joists are dry and free of dirt before applying. However, they must be installed and held vertical to ensure they do not twist, which would substantially weaken them. The tongue and groove are only along the 8 foot edges. Not Elmer’s glue. Once you’ve installed a vapor retarder, install your subfloor. Because this floor may be exposed to weather before the second floor and roof can be installed, we covered it with Zinsser Shellac. Each subsequent piece of plywood will depend on the first piece being installed correctly. Install a layer of at least ½” or preferably 5/8” ply over the existing planks. But to start off, we will need to remove the tongue so the plywood is tight with the exterior ICF walls. (There is a picture of this below.) Since 2009. Not so much the case ... we built stairs, backfilled, insulated ... just to name a few projects that had to get done as I tried not to glance up at those open floor joists ... and finally it's plywood day. The second floor of this house is built with 2 x 10 wood I-joists (joists that resemble steel I-beams and are 9.5 inches thick), 16″ on center and spanning 13.5 feet. These joists are stronger than comparable solid wood joists, provide a 66% larger nailing surface for the plywood subfloor (2.5 inches instead of 1.5 inches) and are more uniform than traditional lumber joists. If the house is out of square, it will make it exceedingly difficult to get the plywood straight on the joists. https://vinawoodltd.com/wp-content/uploads/2020/09/logovinawoodsmall1-1.png, https://vinawoodltd.com/wp-content/uploads/2020/11/trim-edge-of-plywood-subfloor.jpg, Copyright © 2020 VINAWOOD Co., LTD. Headquarter: 92 Thien Duc, Yen Vien, Gia Lam, Hanoi, Vietnam | Hotline: +84-83-333-2333 | Email: Email: [email protected] |, Consider both load bearing capacity and deflective properties when selecting subfloor materials. Put a nail every 8-10 inches on the surface. My rooftop sun deck fantasy would not come true on this day. Install one sheet of plywood at a time. The center of the first joist from the end will need to be installed 16 inches on center from the edge of  the end of the house, as opposed to the middle of the joist, so that the plywood can start at the very edge of the house. Step 5: Tap the subfloor into place. Shellac is not a long term solution to prevent the plywood subfloor from delaminating under the elements; however, it does provide some additional weather protection in the short term, and is worth the relatively small time and money investment for a project like this where it could be several weeks before the floor is under roof. Uncategorised; how to install plywood over existing subfloor Spanning ratings for plywood and OSB are based on this assumption. Don’t skip using the block. Step 6: Check that the sheet of plywood is square and tight against both sides. Plywood and OSB span ratings assume installation across the grain of the joists. And it should be ready for the next flooring installment. Solid joists take longer to burn through, and will provide structural support longer. Dry fit components first to make sure sheets land on the center of joists. Tom: Yeah. Please review Disclaimer and Terms of Service. Matching up with the chalk line, reaching the center of the joist. I'm hoping that if I install some 2x4's underneath the subfloor perpendicular to the joists the subfloor will be reinforced enough. Chipboard is faster to install as it has tongue and groove. At times it may be necessary to go shorter on this measurement, but when this happens, the plywood will need to be cut to accommodate the shorter length. You can snap a chalk line across the joists to make nailing simpler. Take our word for it: this is important and very hard to correct if done improperly. Plywood underlayment is typically needed when a floor material must have a very smooth, flat surface. Subflooring glue is applied to the tops of the joists. The view up there is amazing. 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