Loose or damaged subfloors can cause squeaking and affect the performance of the finished flooring that is installed over it. To move ahead to Part 2, click here.. Put a nail every 8-10 inches on the surface. To install a floated subfloor system, first place a layer of plywood subfloor panels with the edges parallel to the wall. Chipboard is faster to install as it has tongue and groove. But we are enjoying it now! In this article, we’ll cover the installation of a 3/4″ plywood subfloor, including tips and pictures from our work with Habitat. How far apart should the joists be, both side-to-side and front-to-back? 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. Because this floor may be exposed to weather before the second floor and roof can be installed, we covered it with Zinsser Shellac. It aids during installation if the joists are installed exactly 16 inches on center throughout the floor. 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. We are using ring shank nails, or nails with rings on their shanks. Not Elmer’s glue. Walk over a unfinished plywood floor that has only a single layer of plywood. The spacing of the joists supporting the floor determines the plywood thickness. Step 4 Nail down the rest of the sheet, spacing nails about every 12 to 18 inches apart down the joist. 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. Make sure the plywood is square. How to install plywood to a subfloor around a toilet. Also, these joists are not as safe in a fire. 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. I was so thankful our cousin Justin was here to pack plywood upstairs. Each subsequent piece of plywood will depend on the first piece being installed correctly. (See our wood joist comparison.). You can see in this picture that the plywood sheets making up the subfloor in this house are tightly joined together. Sheets of 3/4" plywood weigh as much as 90 pounds!!! It is important to make sure the shellac covers the edges. 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. Then, using a hammer and nail to tap in two set nails, one at each corner. (I'll be blogging about all the other projects we've been up to as well in the next coming bit). Install Subfloor Over Joist Flooring; How To Install Subfloor On Joists Reinforcement Learning; Install Subfloor Over Joist Flooring. Errors tend to compound as you work through these steps. We are big supporters of Habitat’s mission, to provide safe, dry, and affordable housing to needy individuals and families. Next is the subfloor. Nail the opposite corner lengthwise down the sheet, being careful to check the alignment on the edge of the joist below. We dry-fitted the plywood over the shims to make sure the new subfloor was even with the rest of the flooring. It has been torture waiting for plywood day! 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. If you’ve positioned the plywood correctly, it should be sitting half-way over the joist, right next to the adjacent piece, as shown below. The wood i-joists are more forgiving than traditional joists because they have a wider nailing flange. Matching up with the chalk line, reaching the center of the joist. Be sure the joists are dry and free of dirt before applying. Make certain the end of the plywood panel is positioned at the middle of floor joist and secure the panel in place using decking screws approximately 12 inches apart and within 3 inches of the edge at each joist. Since it has tongue and groove the joints which end between the joists do not need extra reinforcement thus less work. Some plywood subfloors deflect more than others. Article quote from - Position of Underlayment to Prevent Cracked Tile … Although OSB (orient strand board) is sometimes used, the most commonly used type of wood is C-D grade tongue and groove plywood. 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. Not exactly a Melissa and Doug puzzle! Tip: plywood sheets are always installed with the grain across the joists. The first thing to consider is what type of wood to use for the subfloor. On the four foot edges, your seams will fall on joist tops, so no need for tongue and groove. 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. This is particularly important if your old sub floor has lumps and bumps in it. Conclusion. Charlie: On the subfloor? At 16″ on center, there will be 7 joists under each piece of plywood, and each piece will end in the middle of the next joist. 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. If the house is out of square, it will make it exceedingly difficult to get the plywood straight on the joists. Make sure that the foundation is square, that the first floor walls are square, and that the joists are square. You can snap a chalk line across the joists to make nailing simpler. Subflooring glue is applied to the tops of the joists. My rooftop sun deck fantasy would not come true on this day. Plywood sheets are laid perpendicular to the subfloor, with no common joints and no adhesives between the layers. Re-secure any loose wood subfloor planks, OSB, or plywood subfloors to the floor joists using 2-1/2" deck screws. Did you leave any expansion gaps between the short ends of the plywood? Install one sheet of plywood at a time. It's what makes a pile of boards and materials into a solid structure. 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. Another approach would be to completely cover the project with large tarps in between efforts. 7.1 - Check the plywood panels for chipped tongue-and-groove edges. Solid joists take longer to burn through, and will provide structural support longer. The right glue is very important here, it's what keeps your floor from squeaking. We used a DeWALT 10″ circular saw for the job. You may want to over-spec the joists in the home to limit deflection, installing 2×12 joists instead of 2x10s. A 3/4 inch sheet of plywood weighs approximately 75 lbs. 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. All houses have joists, except those with a concrete slab subflooring. 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 […] For hardwood floors, use some felt layer over the plywood underlayment for better results. I just set my saw blade to the depth of the plywood and ran it down the edge, removing the tongue. 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. 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. You guessed it, we'll be back to the half sheet on the next row. Step 1: Get the plywood to the right level of the house. You likely won’t be able to push the plywood into place by hand. So it is critical that the second sheet of plywood stagger those weaks spots to get maximum rigidity in the floor prior to tiling. The second (top) layer of plywood joints should not coincide with the joists and the second layer should not be fastened to the joists. Somewhere I saw something about leaving 1/8" gap. Step 3: Lift up the plywood and put construction adhesive across the joists. For example, if you install resilient tiles or sheet flooring over a subfloor, any bumps, dips, or voids in the subfloor may be evident in the finished flooring. Remember, plywood only has a tongue and groove on the sides, not on the edges, since these will be nailed into the joist. Many manufacturers recommend applying a continuous ¼-inch-diameter glue bead to framing members and using a serpentine pattern for supports that are 3½ inches or wider. Concrete slabs should be flat, use a leveling compound to fill any depression or voids. 7.3 - Before you place each panel, apply a bead … There are unique challenges in every plywood subfloor installation, including important building codes specific to your area that no single article could completely address. As with all major construction projects, you should consider consulting a professional before attempting a job like this on your own. Charlie: Or super glue. When installing decking you should lay the pieces so the long dimension of the plywood extends across the joists and the short dimension runs up the joist length. Step 8 Repair any broken planks. Nobody likes a nail popping up in the floor! Uncategorised; how to install plywood over existing subfloor Who knew?! In my mind, there's even a waiter with a tray full of drinks with little umbrellas. 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. The tongue and groove are only along the 8 foot edges. Installation over concrete with a calcium carbide reading of greater than 2.5 percent. Step 2: Measure and dry-set the first piece. We consulted the manufacturer of our floor joists for nailing recommendations. Always install plywood or OSB long-ways across the joists. Select the smooth side of the plywood to be facing up. Also, these nails come coated in a glue on the shank, further helping keep the nails nailed down. 7.2 - Measure and cut the plywood panels so interlocking joints meet at the center of the sleepers. After patching the subfloor and restoring the underlayment as shown in the photos it was time to glue and nail down a second very thin underlayment 1 4 in to assure a perfectly smooth surface. If you did this without a block, it would destroy the groove and make fitting the next row of plywood very difficult. However, they must be installed and held vertical to ensure they do not twist, which would substantially weaken them. This will make installing surface flooring a much simpler task. Lay the panels out flat to cover the subflooring. Dry-setting is important. In this installation, we used Portable Cable’s Round Head framing nailer. Install a layer of at least ½” or preferably 5/8” ply over the existing planks. Dry fit components first to make sure sheets land on the center of joists. The contact detail associated with How To Install Plywood Subfloor Over Joists is also mentioned to make it easy for a user to contact the furniture seller. 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. Use a ¾” spacer between the plywood and the wall and a 1/8” spacer between panels. Tom: Yeah. And it should be ready for the next flooring installment. Assuming a remodel, this is going to involve bringing the plywood to the location by hand, as opposed to assistance by a crane. How To Install A Subfloor. Underlayment covers subfloor flaws … We started first with a 1/2 sheet. 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. You will notice that there is maximum flexing at the areas between the floor joists where two sheets of plywood meet. You’ll be hammer on the tongue edge of the board. Make sure your contractors are careful through each stage. You can see in the picture below that the set nail should be placed about 10 inches off the tongue edge of the board. Stagger stagger. 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. We prefer 2 inch subfloor nails with reverse threads and coated in glue. The cost to do this throughout the 1,200 sf home was about $1,000 for materials and labor. More plywood sheets are nailed down, staggering seams for a stronger fit. Step 3: Lift up the plywood and put construction adhesive across the joists. Be careful! The idea is to get the plywood fastened and take one last look before you fasten it completely. Tell me, does anyone else feel like they are getting stretched apart hauling a full sheet of anything? Step 5: Tap the subfloor into place. These chalk lines run the entire depth of the Momplex, perpendicular across each floor joist, every four feet. The view up there is amazing. The chalk lines serve as guides. Vertical installation can be achieved through careful installation of a rim joist, and if necessary, blocking between the joists themselves. It is installed directly on top of the joists and provides more overall stability as well as a certain amount of moisture protection. ⚛ The information about How To Install Plywood Subfloor Over Joists Easy Steps For Installation is completely presented here. Remember not to nail towards the last 10″ of the tongue side until the next sheet is installed. Habitat provides a great opportunity to learn construction techniques that apply to your own DIY projects, while at the same time helping others in need. Next, lay a second layer of plywood at a 45-degree angle to the … When you are going 44 feet wide, if you get off 1/8" here, 1/4" there, a hair over there ... you'd be surprised at how fast that can add up to inches! If you do this properly, you’ll have a beautiful plywood subfloor. The sledge hammer will easily mar the plywood subfloor making it difficult to fit the next sheet into place. We put the floor joists in in this post. Learn how your comment data is processed. All Rights Reserved. This span rating for plywood defines how far apart joists can be. Step 8: Trim the edge of the floor by snapping a chalk line and cutting with a circular saw. Once you’ve installed a vapor retarder, install your subfloor. Step 4 Repeat Steps 2 and 3 to install … Cupping occurs when hardwood floorboards begin to curl along the length of the board, somewhat like a taco shell but less pronounced. New sheets are carefully pounded in place with a block protecting the open groove side of the plywood. That’s basically how to install plywood underlayment. The wood grain of the panels should be perpendicular to the floor joists. Install one sheet of plywood at a time. Since 2009. We can say that our subfloor feels super sturdy! Take our word for it: this is important and very hard to correct if done improperly. Make sure the house is as square as possible going up – square foundation, square walls, square joists with proper spacing. I knew that overall, the finished product would be far more level and feel more solid. If you tighten the plywood down to the joists near the edge, it is much more difficult to install the sheet. The second (top) layer of plywood joints should not coincide with the joists and the second layer should not be fastened to the joists. This also applies to joists depth. Please review Disclaimer and Terms of Service. You should leave these nails about 3/4″ out of the plywood to make pulling them easy if everything isn’t right. Stagger the joints so no joint runs into another joint. Installing wood subfloors over concrete how to install a plywood subfloor one installing wood subfloors over concrete how to install a subfloor on joists how to install subfloor panels 9 common subfloor mistakes and how to. It was getting pretty late when we finally finished up. Here's wishing plywood was like 45" wide, or I was like three inches taller. Shellac helps temporarily prevent water penetration on the surface and sides of the plywood. Oneprojectcloser – This past Saturday the crew here at One Project Closer spent the day with Habitat for Humanity Baltimore, rebuilding a house in the Sandtown area of Baltimore City, Maryland. Your goal is to have the plywood end exactly half way across the joist, so that the new plywood can start on this spot. There are also other trades between. how to install plywood over existing subfloor. 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. I build and share smart, stylish diy projects. The Wood. 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: plywood@vinawoodltd.com |, Consider both load bearing capacity and deflective properties when selecting subfloor materials. Then I got in trouble for making bad marks .... We all chuckled later when we realized I had had some help! This video covers measuring cutting and the correct tricks for installing to ensure a good bond and long lasting results that never squeak. Step 6: Check that the sheet of plywood is square and tight against both sides. Nails need to be 8d, spaced every 4" and staggered. The subfloor is typically made from plywood or oriented strand board (OSB). 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. For best results, you’ll move back and forth across the whole sheet to ensure a tight fit. Steps to Install 3/4 Inch Plywood Subfloor Step 1: Get the plywood to the right level of the house. If you are thinking of laminate, use a pad to cover the underlayment. Stagger adjacent sheets so that they do not start on the same joist. The boards are laid lengthwise, perpendicular, over joists and joined together. To install a floated subfloor system, first place a layer of plywood subfloor panels with the edges parallel to the wall. For subflooring, you use tongue and groove plywood. Charlie: Okay. 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 subfloor, adding fire stops to first and second floor walls, and adding additional plywood sheathing to the exterior of the house. This is made easier if you have a caulk gun designed for subfloor installation like the one shown below. Make sure the plywood is square. After each sheet of plywood is layed down, I went and marked the open edge, with a mark centered on the open floor joist. When we got to the stair openings, we kept to the pattern (pretending there is no stair opening) and nailed the subfloor down on the other side. But to start off, we will need to remove the tongue so the plywood is tight with the exterior ICF walls. Cut them to lengths so that you can alternate the ends throughout the room. Every once in a while, I have been sneaking up to sit on the floor joist, just dreaming of this day! Copyright 2009-2011 Ana White/Ana White.com. We recommend installing a sprinkler system if you build a house using wood I joists. Dry fit components first to make sure sheets land on the center of joists. 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. Plywood and OSB span ratings assume installation across the grain of the joists. It is exceedingly important that the first whole line of plywood sheets be perfectly straight and square. 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. Step 2: Measure and dry-set the first piece. 3 Answers. Tom: You could use that but I don’t think I would. This site uses Akismet to reduce spam. The rings help to keep the nails from easily popping out (creating a potentially squeaky floor). Spanning ratings for plywood and OSB are based on this assumption. NOTE: This is Part 1 of a 2 part series. Liquid Nails for Subfloors is a common product for this job. We measured and marked where the joists were so we could nail into them. Rather than repairing small spots all over the house, I decided to lay down a new plywood subfloor throughout the home. Side-to-side spacing between our joists is 18 inches on center at its greatest. you are such an inspiration .. just amazing. Remember, you only do this for the first row of plywood. This is best achieved using a sledge hammer and a tapping block. Don’t skip using the block. Farmhouse Bed for American Girl or 18" Dolls, Frameless Bookshelf Customizeable Sizes Template, Trimmed and ready for Christmas - Dollhouse, our modified version of printers sideboard. Use a chalk line to mark the panels for cutting, and wear a dust mask when cutting the plywood. You can see on the non tongue and groove side of the plywood, joints are made in the center of the joists. First, renail the existing plywood subfloor, so that the old nails are tight, and add new nails to achieve a maximum nail spacing of 6 inches. (There is a picture of this below.) Things to take into account when laying ply over plank subfloors: Take time to make sure your existing planks are well secured in place. Also, donâ t forget to wear proper safety Fasten your first layer plywood subfloor as you normally should. Plywood and OSB span ratings assume installation across the grain of the joists. Replacing Entire Subfloor With new 5/8″ Plywood. When you build, you always stagger. Prepping for a subfloor installation happens long before you are actually laying the plywood. And the plywood is layed on top of the joist. Make sure no one is standing below so the pieces can fall freely to the ground. How to Cut the Subfloor to Access the Floor Joists for Plumbing. Fasten your first layer plywood subfloor as you normally should. I'm hoping that if I install some 2x4's underneath the subfloor perpendicular to the joists the subfloor will be reinforced enough. Step 4: Set the plywood on the construction adhesive with the tongue oriented towards the groove of the adjacent sheet. Step 9: At this point, the plywood subfloor is complete. Step 7: If everything looks good, use a pneumatic framing nailer to fasten the boards to the joists. Coming from past experiences of screwing down subfloors, this really felt like we were cheating. It’d be kinda messy. Carhartts are the new fashion accessory! Ensure that the sheet is still in the correct position, then nail down all four corners. Plywood underlayment is typically needed when a floor material must have a very smooth, flat surface. Always install plywood or OSB long-ways across the joists. 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. Oneprojectcloser – This past Saturday the crew here at One Project Closer spent the day with Habitat for Humanity Baltimore, rebuilding a house in the Sandtown area of Baltimore City, Maryland. If you want to install ceramic or stone tile on a floor, 3/4″ plywood over 16″ OC joists is recommended, even though the code may only demand 5/8″ OSB over 16 OC joists. Screws are needed to fix down the new sub-floor. Is tight with the chalk line and cutting with a circular saw for the piece... Forth across the joists near the edge, removing the tongue and.. Installed over it how to install plywood subfloor over joists and staggered into another joint fit components first to nailing. Installation over concrete with a tray full of drinks with little umbrellas installation the. 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And front-to-back use some felt layer over the plywood panels for chipped tongue-and-groove.! Sneaking up to sit on the edge of the board, somewhat like a shell. The boards to the joists 1,200 sf home was about $ 1,000 for materials labor. Sure your contractors are careful through each stage on top of the sheet is installed directly on top of joist. Tight with the chalk line and cutting with a circular saw for the first whole line plywood. What makes a pile of boards and materials into a solid structure 10″ of the finished product would be completely! Cutting, and wear a dust mask when cutting the plywood to a subfloor installation happens long before are. Perpendicular across each floor joist, and wear a dust mask when cutting the plywood fastened take. Installation across the joists and overload them.https: //c530a180aaf435517e4010cd1acc3002.safeframe.googlesyndication.com/safeframe/1-0-37/html/container.html and joined together tongue side until next! 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