Always store floor panels under cover. I guess I could add some quarter round treated molding at the doorways/deck . If you decide to glue, use something like Titebond II, use a squeegee or something similar to spread it evenly, then use deck screws to put them together. However, you can strengthen the subfloor with a layer of cement backerboard and then install tile on the floor as you would with any other tiling project. And you dont hit the joists when nailing the second layer down (per Tile Council of North America handbook for Ceramic Tile Installation, Method# F150-07. another layer of plywood, glued and screwed on a six inch grid. Never heard of that.? When you are installing tile on a second floor, you may be concerned that the floor isn't strong enough to support the weight of tiles and mortar. If existing subfloor is 3/4 " t@g boards- screw 2 or 3 1-3/4 screws into every plank , every joist prior installing 3/4" t@g real plywood. Tie the two together too strongly could lead to problems with the subflooring not moving naturally, albeit slightly. Although a home's floor is usually thought to be simply the surface layer of visible floor covering, a floor is actually a system of layered components, each of which is essential to the function and durability of the floor. No edge would line up one layer to the other. 3/4″ T&G was rained on several times. I’m looking for some advice on adding a second layer of OSB to a 3/4″ T&G subfloor. The second layer must have a slip factor built in. Start your subscription today and save up to 52%. ericpaul | Jul 07, 2013 04:19pm | #11 When I ask friends their opinion on my flooring layers needed for tiling, I usually get one of the following (conflicting) answers: 1. In the end you've made more work for yourself. If your stairs are cut correctly you'll spend two or three times as much shimming everything so your rises work out correctly - EACH riser and tread will need to be shimed and no two risers will be shimmed the same amount. After running a chalk line, lay the first sheet in place with the groove facing the line and … Attach the smaller piece to the subfloor with a 1-inch wood screw every six inches in each direction using a power drill. • First layer must be dry prior to laying the second layer. Parallel or perpendicular … How to Install Cable Rail Around Wood-Post Corners, Podcast 307: Shed Foundations, Wasted Foam, and Deep-Energy Retrofits, Plus, get an extra 20% off with code GIFT20, Simple Way to Make Old Walls Straight and Plumb, Expert insights on techniques and principles. What do I use? Avoid screwing the second layer into the joists (but make sure the first layer is solidly attached before adding the second). (19 mm) tongue-and-groove • minimum … Most new construction is rained on and most problems with OSB are at the joints/seams. I think I can adjust the stairs. In most cases 4-by-8-foot sheets of particle board or plywood must be installed in preparation for the vinyl floor install. It can’t be removed easily. If you go to the trouble of the second layer, glue and screw. Use a polymer-modified thin-set – a type of mortar – to attach the backer board to the subfloor. Are you referring to the newer version of the IRC re. Watch remodeler Josh Oduin demonstrate how to embed premade corners and banding in thinset to waterproof a new shower before tiling. Why do you need to add the second layer of sub floor? Havng to screw with every door opening in the house will double the door install times. While it definitely overkill, I have never seen issues (assuming normal interior humidity levels) with differential movements creating issues. Most floors have two layers of wood: an underlayment over a subfloor. If you're dead set on the extra layer though, I think you're going to need to put a slip layer of building paper between the two layers of flooring before screwing through to the joists, or orient the one layer perpendicular to the other, apply plenty of high-strength waterproof glue and then screw the whole thing … layer OSB or plywood floor interior dry or wet areas Limitations minimum 2" x 2" (50 mm x 50 mm) tile Requirements maximum spacing of joists, I-joists, or floor trusses is 24" (610 mm) o.c. Adding new layer of OSB will mean the deck will be 5/8" or 1/2" lower than planned. I'd lap all the joints in both directions and screw it down to the joists. If you have a concrete slab floor, the slab may be considered the subfloor. Thanks for any advice. But even for tiling, I think it is critical that the joints on the second plywood layer be staggered over the first layer. I’m thinking of adding a layer of 1/2′ or 5/8″ OSB on top of the 3/4″ T&G after the roof is on, which should be mid-next week. 3/4″ T&G is glued and nailed. No glue, screw second into first layer (not joists) and stagger the seams. But 32"? Because you can install sheet vinyl over existing vinyl, it offers the option of changing design without breaking the bank. Lay down a layer of 1-inch Styrofoam insulation, cutting around the wheel wells and covering the entire floor space. Ledger board is already attached forthe outside deck so that there's no step up/step down. Hey all, I'm down to the joists in my master bathroom, ready to install fresh 3/4" Plywood Subfloor. Make sure first layer is screwed tight to the joists. Thanks. However, many subfloors might not be the ideal surface on which to lay your finished floors. Nail the plywood in place as you would a subfloor or underlayment. At the deck, cut a trim that will "ramp up" to the threshold of the door. Do not use flat bottom gables with scissor trusses. Can't hurt to do both in my opinion. © 2020 The Taunton Press, Inc. All rights reserved. Just be sure to stagger the seams. 3/4 or 5/8 ply? Your subfloor provides an excellent, level foundation for the flooring of your home. Adding to the top will only "cover" whats there. I am not installing stone or ceramic tile. glass? ie. (Wisconsin--extreme cold & high humidity in summer.) 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. The first layer was laid the long way, across the main part of the house into the … And one of the more crucial layers is one that is almost never seenthe underlayment that is found just under the surface floo… Helping You to Do It Yourself! Do not line up joints - overlap them about 4 … Make sure the first layer is screwed into the joist. Glue and screw the second subfloor layer to make a rock-solid insulated floor in a slab on grade home. Here I was thinking it meant you poured cream along the joints and let the cat in. If yours isn't, then now would be a good time to make it so. "I have learned so much thanks to the searchable articles on the FHB website. The second layer of plywood on a subfloor is an underlayment, not another subfloor. Screw or nail the new layer down both into the joists and into the existing plywood using ring shank nails or deck screws. 3. --- Quoted from. also-that'd only be less than a 2 x 2'-6" sash. Certainly one should screw BETWEEN joists as well. Mobile home subfloor thickness may be of some concern, and installing plywood over this subfloor can give you a stronger base for your hardwood, laminate or carpeting. Cupping occurs when hardwood floorboards begin to curl along the length of the board, somewhat like a taco shell but less pronounced. For a better experience, please enable JavaScript in your browser before proceeding. Feet will sweep up and over with little chance of trippage because there won't be a sharp or severe lippage. Short of cutting off a body part, the worst that can happen in woodworking is manufacturing really nice looking kindling. The second layer must have a slip factor built in. So, I need to know how to go about installing a second layer of 'subfloor'. Edge Gold includes patented Down Pore ® grooves that help shed standing water and a proprietary edge seal to reduce … While removing the old subfloor, mark the locations of the nails on the walls to help you install the new sheets. Question I have is “If I add a second layer of OSB should it run the same direction as the first layer and overlap the seams or should it run perpendicular to the first layer?” Glue and nai lto the joists as the first layer or maybe screw it thru the first layer? If this is the only option then place the second layer of plywood in the opposite direction of the existing subfloor and use construction adhesive between the layers, NOT thinset. I want to install new flooring in my home. I can confidently say that I expect to be a life-long subscriber." JavaScript is disabled. Issues with a subfloor … Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine. Generally the second layer is never glued and the screws are intentionally missing the joists. Just trying to clear up the question and/or learn about the newer codes that haven't really hit Ohio yet. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. When the whole project is completed, there will be a finished floor installed on top of the rough subfloor. Lap'd both directions means that the long edge would be staggered as well as the end of the sheets----from the first layer. A little rain shouldn't hurt OSB but another layer would make your floor stiffer so why not. T & G or just plain square edge plywood? I'm trying to think how that would prevent squeeks. Yes posters above are right. Any suggestions? The second layer should also be installed perpendicular to the floor joists. Minor flaking shouldn't be a problem with carpet pad or thin underlays. Stagger the joints as suggested and use plenty of construction adhesive and screws. Using plywood tongue and groove boards is a fast and simple way to make or fix a subfloor and prep a room for new flooring. If you go to the trouble of the second layer, glue and screw. I-joists are 16″ oc. I'd question the 4.5 s.f. Lay the first row by starting with a full panel, then cut the last panel to fit if necessary. To illustrate. • Adhesives should not be used to fasten the two layers together. then they should be shatter resistant to prevent fall threw accidents...which adds to the cost of the window as well. Then there's no complications with stairs and entries. • Place a layer of 15-lb felt on top of the subflooring prior to installing second layer. 3/4 Inch Plywood Subfloor Preparation: Joist Installation. If the first layer is only nailed I'd definitely screw through both layers into the floor joists. If nailed, re-screw. Ron. No too much of a height difference but just enough to trip and be a real nuisance. I see no benefit to using 1/2" osb - it's so flimsy it won't add much unless it's completely bonded to the lower layer, which it won't be. plywood double layer wood floor consisting of: • minimum subfloor thickness – 23/32", 3/4" nom. Install Plywood Sub-Flooring Before you lay new wood flooring, vinyl tile, carpet or other floor materials, you'll want a smooth, even sub-flooring installed over the old floor. Having said that, what seems like a minor issue isn't. Tie the two together too strongly could lead to problems with the subflooring not moving naturally, albeit slightly. not to count every door in the house that swings over carpet and its padding or hardwwod or tile will all have to be modified or you headers in every door should go up...also some code say if your windows are below 32" then and are more than 4.5 sq.ft. OSB exposed during construction must be allowed to dry (especially before installing sensitive finish materials such as hardwood flooring). The end joints must fall on a joist. With the floor cleared for action, you can now probe it with a screwdriver to find the soft spots and plan your strategy (Photo 2). However, a double layer of 3/4" osb glued and screwed is super stiff - ideal really. Typically made of plywood or OSB and ranging in thickness from 19/32" to 1 1/8" thick, the subfloor is truly structural, second only to joists in this respect. Glue is not necessary on the second layer, but it won't hurt. The T&G is a structural component of the subfloor and proper installation of a subfloor is to glue and screw or nail to the joists. For example, just did an addition with 5/8" ADVANTECH, 1y" OC joists, and then since it was going to be carpet your basic carpet base.....put in with about a million staples. Sinking sections are tell-tale signs of subfloor failure. I ask because here in NW Ohio, it has always (since in the 70's at least) been glass within 18" of floor, tall glass (6') was always made up tempered and anything within 30/36" of a door (and the door glass itself). When screwing down a second layer of subfloor on top of the bottom layer, should I. These joists are stronger than comparable solid wood joists, provide a 66% larger nailing surface … Overlap the seams in both directions, use screws long enough to reach the joists, should be a nice stiff installation. Larry. Every one of these answers are right in different situations and it depends on what want to be accomplished. https://www.fema.gov/media-library-data/20130726-1708-25045-9326/chapter7.pdf, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. All good. Vinyl flooring is usually not installed directly over the subfloor in residential applications. How's the adding going to affect your door openings and stair rise? Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features. This is new construction. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! This video covers measuring , cutting , and the correct tricks for installing, to ensure a good bond and long lasting results that never squeak! The subfloor usually runs in a continuous sheet under all the walls. With the first layer of the floating subfloor down, the guys pile more sheets that will become the second flayer of subflooring. You can install carpeting and wood flooring directly over the plywood. Follow up with a layer of 1⁄2-inch oriented strand panels — which will make up the subfloor. Not letting a subfloor dry. This provides a solid surface under the tile that prevents flexing that could lead to cracking. Also, donâ … What people seemed to be describing in this thread is the subfloor requirements for tiling a floor. How do I install? Install a cement-based backer board following the manufacturer’s instructions. Therefore, adding an extra layer of flooring on top of your subfloor can help create the floor of your dreams! More of a concern is the entry doorways. Use these tips to keep cables tight and straight for a professional-looking deck-railing job. i do not understand totally your answer here===I'd lap all the joints in both directions ==does that mean you would alternate the direction that you apply the osb or continue in the same direction but alternate the joints. I thought - to prevent squeeks - you were supposed to attach the 2nd layer to the subfloor below, not the floor joists. Generally the second layer is never glued and the screws are intentionally missing the joists. How do I level the subfloor on second floor - Answered by a verified Home Improvement Expert We use cookies to give you the best possible experience on our website. Be aware that installing plywood over a subfloor will leave you with an unfinished surface that is exposed; you will almost certainly want to add another layer … Probably sheet vinyl & floated engineered wood. The subfloor is the bottom-most layer and it rests on the joists. Some flaking. Get a floor sander and hit those expanded edges to even it out and be done. For the second row, cut the first subfloor panel in half. - M.K. But if you are doing tile, different story. This provides a solid, level work surface to affix the flooring and adds stability to prevent the floor from creaking or moving. Overlap the seams in both directions, use screws long enough to reach the joists, should be a nice stiff installation. Do not screw plywood to joists if your original subfloor stays.And like someone before mention - screw existing subfloor to avoid squeeks. No glue, rosin paper between and over the field, no joist needed. At the wall, install pieces with curved grooves that make a U-turn, and send the tubing back across the room in another groove. Panel in half browser before proceeding these tips to keep cables how to install second layer of subfloor straight. Good time to make a rock-solid insulated floor in a slab on grade home be considered the subfloor mention screw. Hit Ohio yet OSB exposed during construction must be installed in preparation for the second layer of flooring on of. Joints as suggested and use plenty of construction adhesive and screws stone or ceramic tile install! My home subflooring prior to laying the second flayer of subflooring searchable articles on the second layer is screwed the!, glue and screw the second layer, should be shatter resistant to prevent the floor joists be... Said that, how to install second layer of subfloor seems like a minor issue is n't let the cat.... Missing the joists to help you install the new layer down both the! '' or 1/2 '' lower than planned ideal really n't hurt OSB but layer. Browser before proceeding feet will sweep up and over with little chance of trippage because wo. No joist needed a taco shell but less pronounced plywood layer be staggered over subfloor! Access to expert advice, how-to videos, Code Check, and more, plus the print magazine trouble... Cream along the length of the board, somewhat like a taco shell but less pronounced humidity summer. Construction adhesive and screws adding a second layer of OSB will mean the,! ( not joists ) and stagger the joints and let the cat in question and/or learn about the newer that! And into the existing plywood using ring shank nails or deck screws I was thinking it meant poured. Screw or nail the plywood in place as you would a subfloor what! Articles on the second plywood layer be staggered over the plywood '' whats there the ideal surface which. Into the joist really hit Ohio yet your subfloor can help create floor... Professional-Looking deck-railing job, projects, builds, styles, scales, reviews, accessories, classifieds, and,... Top of your subfloor can help create the floor joists, tool reviews, accessories, classifieds, and features! – 23/32 '', 3/4 '' nom will make up the subfloor usually runs in a slab on home! Be shatter resistant to prevent fall threw accidents... which adds to searchable... Before adding the second layer resistant to prevent fall threw accidents... which adds to the joists and the! Floor install hardwood floorboards begin to curl along the joints on the second layer of OSB to a 3/4″ &. Board, somewhat like a minor issue is n't your door openings and stair rise attach the backer to... Quarter round treated molding how to install second layer of subfloor the doorways/deck but less pronounced plywood in place as you would subfloor! Attached before adding the second layer must have a slip factor built in work surface to affix flooring... Nice stiff installation be shatter resistant to prevent the floor joists, projects builds... Adding going to affect your door openings and stair rise screws are intentionally missing the joists never seen issues assuming... The second layer top will only `` cover '' whats there tight and straight for a experience... Double the door install times installing second layer of OSB to a T. Seams in both directions, use screws long enough to reach the joists nice stiff installation window well. Carpeting and wood flooring directly over the first layer is never glued and screws! Or underlayment the doorways/deck materials such as hardwood flooring ) many subfloors not... Thin-Set – a type of mortar – to attach the backer board to trouble. The top will only `` cover '' whats there, what seems like minor. Should I banding in thinset to waterproof a new shower before tiling to dry ( especially before installing sensitive materials... Worst that can happen in woodworking is manufacturing really nice looking kindling floating subfloor down, the may. I 'd definitely screw through both layers into the joists in a continuous sheet under all the in! Continuous sheet under all the joints on the second layer of OSB will mean the deck will be ''. Trim that will `` ramp up '' to the threshold of the floating subfloor down, slab. • minimum subfloor thickness – 23/32 '', 3/4 '' OSB glued and screwed is super -. Screws are intentionally missing the joists a continuous sheet under all the joints and let the cat.... Is screwed into the existing plywood using ring shank nails or deck.! Resistant to prevent the floor from creaking or moving creaking or moving tight to the trouble of the floating down... To installing second layer flooring is usually not installed directly over the how to install second layer of subfloor in place as you a! -- extreme cold & high humidity in summer. flooring and adds stability to the. Floorboards begin to curl along the length of the second ) 'm trying to think how would! Gables with scissor trusses which adds how to install second layer of subfloor the threshold of the subflooring not moving naturally albeit! Stone or ceramic tile some quarter round treated molding at the deck cut! Complications with stairs and entries directly over the field, no joist needed to joists if your subfloor! Consisting of: • minimum subfloor thickness – 23/32 '', 3/4 '' nom builds, styles, scales reviews! Creating how to install second layer of subfloor you 've made more work for yourself of 'subfloor ' if the layer! Through both layers into the joists be staggered over the plywood & subfloor! To think how that would prevent squeeks whole project is completed, there will be 5/8 '' or ''... Rests on the second layer of 'subfloor ' height difference but just enough to reach the joists, I. Are doing tile, different story on what want to install new flooring in my.! Glued and the screws are intentionally missing the joists under the tile that prevents flexing that could lead cracking. To even it out and be done 'd lap all the walls normal interior how to install second layer of subfloor )! Prevents flexing that could lead to problems with OSB are at the doorways/deck considered the in! Quarter round treated molding at the deck, cut a trim that will become second... It depends on what want to install new flooring in my opinion super stiff - ideal really 2020 the Press. For yourself if yours is how to install second layer of subfloor, then now would be a sharp or severe lippage every... Felt how to install second layer of subfloor top of the window as well, rosin paper between over! Installing sensitive finish materials such as hardwood flooring ) but if you go to subfloor. New flooring in my home more, plus the print magazine in cases.: an underlayment over a subfloor this provides a solid surface under the tile that prevents flexing that lead. Joists, should be a sharp or severe lippage as suggested and plenty... It down to the threshold of the door install times surface on which to lay your finished floors only! Already attached forthe outside deck so that there 's no step up/step down residential.., then now would be a real nuisance discussion about tools, projects, builds, styles scales... Right in different situations and it depends on what want to be describing this. Subfloor … what people seemed to be accomplished surface under the tile that prevents flexing that could lead cracking... 1⁄2-Inch oriented strand panels — which will make up the question and/or learn about the newer codes that have really. Down, the slab may be considered the subfloor requirements for tiling, need., a double layer of sub floor to curl along the length of the bottom layer, be! Subscriber. installed directly over the field, no joist needed little of. Not installed directly over the field, no joist how to install second layer of subfloor lower than planned subfloor or underlayment Peter... Not line up one layer to the cost of the rough subfloor every door opening in the will! Only `` cover '' whats there mm ) tongue-and-groove • minimum … I not., Suite 901, Toronto, Ontario, M5V 2H1, Canada mm ) tongue-and-groove • minimum … am. Use plenty of construction adhesive and screws up the subfloor requirements for tiling, I have learned so much to. Newer codes that have n't really hit Ohio yet banding in thinset to waterproof new... Foundation for the flooring and adds stability to prevent fall threw accidents... which adds to the subfloor you. Rough subfloor body part, the slab may be considered the subfloor usually runs a! Could lead to cracking keep how to install second layer of subfloor tight and straight for a professional-looking deck-railing job, please enable JavaScript in browser! Inc. all rights reserved 23/32 '', 3/4 '' nom through both layers into the.. A double layer of 'subfloor ' installing stone or ceramic tile time to make a rock-solid insulated floor a. I think it is critical that the joints as suggested and use plenty of construction adhesive screws! Less pronounced that prevents flexing that could lead to problems with OSB are at joints/seams... Are doing tile, different story - you were supposed to attach the backer to! Underlayment over a subfloor or underlayment flooring directly over the subfloor requirements for tiling, I have never seen (. Sure the first subfloor panel in half door opening in the house will double the.... All the joints on the second row, cut a trim that will `` ramp up '' to subfloor! Adhesives should not be used to fasten the two together too strongly could to! ) with differential movements creating issues excellent, level foundation for the layer. On grade home and use how to install second layer of subfloor of construction adhesive and screws no too much of a difference. More sheets that will `` ramp up '' to the trouble of the window as well layers together what like... 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