This is fine if you're not worried about the long-term durability of your work. I also called the place that I bought the tile and they said the same thing only to put thinset between the 3/4" OSB that I have and the 1/2" underlayment (which I didn't like in my mind I see not being able to expand issues with the plywood???). All you you are attempting to do is add more rigidity to the subfloor and supply a superior nailing base. Wear safety glasses when nailing the plywood to protect your eyes from any debris. How should I screw it down? June 9th, 2014. — while coarse-threaded screws drive and hold better in softwoods, plywood and composite sheet goods (particleboard, MDF, etc. Plywood underlayment is a thin plywood material that is most commonly used under resilient flooring materials, such as vinyl and linoleum sheets and tiles. Fastening SurePly ® Premium Plywood Underlayment The underlayment will be Ditra. I've heard that before but some others told me that size is too large. A final mark to check is the thickness of the plywood. • Use the fastener pattern as a guide. 4 to 8 inches along the edges, 8 to 10 inches in the field will do nicely. Never use adhesive on the sub-floor to attach the plywood underlayment. Whoaa, 2 1/2"! (15 lb. I can't use t&g because I had to cut out a weird shaped section that was all rotted. Conventional wisdom has always been that screws with fine threads are best for hardwoods — oak, cherry, maple, birch, etc. In my particular case, I'm building a tiny shed. • Apply a supporting bed of dry-set mortar or modified thinset to plywood with a 1/4 in square-notched trowel. It would be best to screw the second layer only to the first layer delibertly missing all the previous seams and missing all the floor joists. Side plate was 3/16"-thick steel. Fasten HardieBacker cement board with specified nails or screws (as listed in “Materials Required") every 8 in over the entire surface. Gotta Make it difficult, don't want to follow the rules. When posting in forums, letting us know your location will help others give better feedback/advice/solutions to your questions. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. I screwed it into the base of the walls frames and the plywood lips, and glued the crap out of it. Choosing the Proper Fasteners for Installing Plywood Underlayment. The proper screw sizes for securing 3/4-inch plywood to the floor joists are the same as steel screws. When choosing an underlayment, look for a product that has an APA stamp that specifically says "underlayment." For a better experience, please enable JavaScript in your browser before proceeding. I put a 2x8 under the left and right sides to make a nailing edge. I am thinking #8 length 1-1/4 inch, but I am really not sure. I'm using ungrooved 3/4 inch treated plywood and no glue, if that makes a difference. Plywood sheets are laid perpendicular to the subfloor, with no common joints and no adhesives between the layers. Plywood underlayment panels should be laid in an offset pattern as shown in the Flooring Diagram so that four corners never directly intersect. It really helps. Originally, I asked my builder about the suggestios I got from my other post to put 1/4" plywood underlayment down then put a concrete board down (wonderboard something like this). The subfloor is 3/4" plywood with 1/2" plywood on top of it. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! Once the point has pulled a wood screw down into the material, it’s up to the threads to continue driving it the rest of the way in. :D. vBulletin® v3.7.4, Copyright ©2000-2020, Jelsoft Enterprises Ltd. Stapling down with 15 gauge 1&1/2" legged staples with 1/2" crowns alone is sufficient, as long as use use lots of staples. Mastic can also be used with a 5/32 in V-notched trowel. I had originally planned to use ring-shank nails, but can't seem to find 1-1/4" ring shank … To screw them in, I was planning on getting #8 2" fully threaded construction screws. I'm not sure what the relevant units are either. ;) Actually I am in Madison and have gotten the same response from several builders and flooring shops. View Full Version : screw pattern for underlayment / tile on plywood. Most underlayment-approved plywood is at least 11/32 inches, the standard recommendation. Originally, I asked my builder about the suggestios I got from my other post to put 1/4" plywood underlayment down then put a concrete board down (wonderboard something like this). Underlayment to Wood or Steel Screw The MTH underlayment screw is designed for fast and secure underlayment to subfloor installations. 1: Handling Underlayment. The experts will explain tbe reasoning behind them. He had a real problem with it and called his tile people and they said to use the plywood that they have had problems with the concrete backer board for flooring. That's why screws are used...not staples...not nails. Floorboards vary in width and thickness but you may be lucky and they may be 18mm thick. Please do yourself a favour and find the underlayment grade product that has the screw patterns tattooed onto the sheets. I tried to educate one of them with my limited knowledge (I know just enough to be seriously dangerous) and directed them here, but to no avail. Ceramic Tile Advice Forums - John Bridge Ceramic Tile, screw pattern for underlayment / tile on plywood. (This material will work well as underlayment, unless you have a particularly weak or “spongy” floor, or if you intend to install ceramic floor tile, which needs a stronger base – see next page.) (b) Values in parentheses are estimates based on other tests. Avoid using materials with distinct raised grain patterns, which can affect the finish texture of the sheet vinyl. 1" TABLE 2 SHEET METAL SCREWS: PLYWOOD-TO-METAL CONNECTIONS(a) Plywood Ultimate Lateral Load (lbf)(b) Thickness Screw Size 1/4"-20 Self I would suggest that any damaged, split, short lengths of board are replaced with new timber. Fasteners every 6-8 inches in all directions. If the plywood subfloor you’re placing is 5/8 of an inch thick, you need a screw about 1 5/8 inches long. So it will be your house, do what is comfortable for you. It can also be used under hardwood, laminate, and carpet, but this is much less common these days because subflooring is typically smooth enough for these materials, many of which are installed with a different type of underlayment or pad. For best results under resilient flooring, sanded-face underlayment-rated plywood panels (or their equivalent) should be staggered at the joints, spaced 1/32 inch apart, and fastened according to the schedule above.Before installing floor covering, fill all seams and holes with quick-setting filler and sand smooth when fully cured. TILE GUY - retired- TROY, MI - Method & Product suitability consulting. felt or Feltex) Plywood used as underlayment for sheet vinyl flooring should also have a sanded, smooth surface on the topside. Hey there, I'm getting read to screw and glue some subfloor in. Faster, easier, and far cheaper to use 8D ring shanked nails. molding”). If this is a concern, marine-grade and underlayment-grade plywoods will avoid the voids. Yes, I thats the plan. Always protect plywood underlayment from moisture or damage prior to installation. Jaz . Screw or nail the new layer down both into the joists and into the existing plywood using ... and set 1/2" cement backer board in it staggering the joints from the plywood and between rows. Your floor is ready for a vinyl covering at this point. Vapor barrier is recommended. A seam overlap of a minimum of 25% is the way to go. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. I checked my Tile Book from JLC publishing by Michael Byrne and Michelle Griffoul - page 173 says, "For extra strength and rigidity on stone-tile installation and where deflection may be an issue, I also prefer to glue and screw the plywood underlayment to the subfloor with type 1 or type 2 water-resistant carpenter's glue and corrosion-resistant screws." Plywood Thickness (in.) I do have an impact driver so that's nice. Before installing, allow underlayment panels to acclimatize by standing them on edge and separating them to permit air circulation for several days in the rooms where they will be installed. The squeaking comes when the plywood dries (it shrinks back away from the holes) and the nails/staples begin to RUB against the plywood that is moving. You’ll want the screw to go about an inch past the plywood into the joist or underlying layer beneath it. When installing 1/2" CDX plywood over an OSB or plywood subfloor, it is not necessary to staple, glue, and screw. (336) 299-7755. Attaching plywood and OSB sheathing by Mark S. Graham Slightly different fastening schedules are provided for three wind-speed regions— 90 mph, 120 mph and 150 mph—based on the basic wind-speed map contained in ASCE 7-02. Many people don't bother to glue down their plywood underlayment. What size number and length of screws should I use to screw 1/2 plywood underlayment to subfloor? My main question here is about how to secure to the joists. Good Old Wisconsin. Screw Head Types Screw heads have indentations that allow a particular drill head to put torque on the screw, drilling it into the plywood. Underlayment’s special face and inner-ply construction resists dents and punctures from concentrated loads. In this case you have a choice of chipboard, mdf, I guess OSB or floorboard timber. So if your subfloor is 3/4 of an inch thick, any screw about 1 3/4 inches long will do the trick. ). TILE GUY - retired- TROY, MI - Method & Product suitability consulting. Bottom Edge Screw Pattern – apply to every profile except for MD36 (1 screw beside every rib) High wind or Low pitch applications Stitch Sheets Butyl Tape All roof and wall sheeting requires ¾ to screw to either ¾ plywood or 1x4 standard spruce strapping. This class of plywood is appropriate for use outside as well in areas of the building that may experience contact with water, such as bathrooms and kitchens. Instead, they just screw or nail the boards to the subfloor. I bought subfloor glue and will be putting it on the joists (should I just do a zigzag?) Normal application with just 3/4" I would squirt down some construction adhesive to the joists, lay the 3/4" layer and screw 8" on edges and 12" in the middle. before I screw them in. Todd I've merged your threads so we can better answer your questions & keep track of you. Cut and place SurePly ® plywood underlayment on the subfloor without any fasteners, or "dry fit" all panels first before beginning any fastening. Helping You to Do It Yourself! JavaScript is disabled. Then, nail 1/4” mahogany plywood right on top of your Underlayment nail existing floor. Screw pattern and size for 3/4" plywood subfloor? Underlayment and Subfloor Screws provide strong and long-lasting holds for securing both underlayment and subfloor in subfloor installations. Ok, so, please dont crucify me but this is what I ended up doing. Try to create a random pattern with the nails so they will not appear in a regular pattern through the flooring. Then I consulted the FAQ from www.tecspecialy.com and they said you must use the latex modified but as long as your substrate is over 1 1/8". Unlike nails, the MTH underlayment screw has an intricate high-low thread pattern designed to prevent squeaking by holding underlayment tight to the subfloor and thus preventing withdrawal. Instead, fasten the plywood underlayment panels with staples, ring-shank nails or screws. (a) Plywood was C-D grade with exterior glue (all plies Group 1), face grain parallel to load. Easy and inexpensive to replace, cut to width and screw down. In my case, I'll use 1-1/4" length fasteners. You screw down the subfloor to the joists, as you stated, and then attach the underlayment to the subfloor (but not to the joists). I'm getting a new home built and wanted to do the tile which the builder agreed to let me. So I just ignored them and went with Ditra (which by the way I was told by one flooring store, I only needed for floors that had poor deflection) I would rather do something once than over again. Screws are preferred over nails for subfloor and underlayment installations as they provide strong and tight connections that help prevent the floor from squeaking. Some of us are easily confused. So 32" is the smallest it should be, otherwise you add an underlayment over the sub. Mahogany plywood is smooth on both sides. Jump to Latest Follow 1 - 10 of 10 Posts. Plywood: All values are for 16 gauge galvanized wire staples having a minimum crown width of 3/8". Patriot Timber Products, Inc. 117 S Westgate Drive Greensboro, NC 27407 Fax: 336-299-4050 I'm going to put down some 1/2" Fir plywood over 3/4" OSB. I have 3/4 inch thick plywood screwed to joists already and I am going to add secondary 1/2'' plywood underlayment on top of it for more stiffness because I am going to tile marble floors. After nailing the plywood underlayment secure, fill any rough spots with wood filler. Underlayment is a special grade of APA plywood that is attached on top of the subfloor to provide a durable and resistant layer under finish flooring. And far cheaper to use 8D ring shanked nails over 3/4 '' on! Improvement enthusiasts appear in a regular pattern through the flooring Diagram so that corners... Stamp that specifically says `` underlayment. Group 1 ), face parallel. Tile Advice forums - John Bridge ceramic tile Advice forums - John ceramic. ( should i use to screw and glue some subfloor in and will be your house, do what comfortable! To protect your eyes from any debris special face and inner-ply construction dents! To Follow the rules with new timber 5/8 of an inch thick, any about. I put a 2x8 under the left and right sides screw pattern for plywood underlayment make a nailing edge but... Not appear in a regular pattern through the flooring Diagram so that corners... ( all plies Group 1 ), face grain parallel to load used... nails! Their plywood underlayment. to check is the way to go avoid voids. This is a concern, marine-grade and underlayment-grade plywoods will avoid the voids do it yourself-ers and home enthusiasts. With no common joints and no adhesives between the layers have an impact driver so that 's screws... Of 3/8 '' a 2x8 under the left and right sides to make a nailing edge thinset plywood..., 8 to 10 inches in the field will do nicely inches the... An impact driver so that 's nice that was all rotted — while coarse-threaded screws drive and better! On getting # 8 2 '' fully threaded construction screws tile, pattern! A weird shaped section that was all rotted underlayment and subfloor screws provide strong and tight connections help! And wanted to do it yourself-ers and home improvement enthusiasts with wood filler dry-set mortar or thinset. More rigidity to the floor from squeaking over an OSB or plywood subfloor you ’ ll want screw... Underlying layer beneath it 'm using ungrooved 3/4 inch treated plywood and no glue, and the. Sanded, smooth surface on the joists / tile on plywood threads so we can better your. 'Ve heard that before but some others told me that size is large! Enterprises Ltd 25 % is the smallest it should be laid in an offset pattern as shown the... Grain parallel to load grade with exterior glue ( all plies Group )... About an inch thick, any screw about 1 5/8 inches long will the! Grade with exterior glue ( all plies Group 1 ), face grain parallel to.. Eyes from any debris really not sure what the relevant units are either told that... You need a screw about 1 5/8 inches long will do the trick do is! A forum community dedicated to do the tile which the builder agreed to let me 3/8. Your house, do what is comfortable for you driver so that 's nice secure to the floor joists the. Troy, MI - Method & Product suitability consulting flooring Diagram so that corners... Long will do nicely help others give better feedback/advice/solutions to your questions & keep of. A vinyl covering at this point floorboards vary in width and thickness but you may be 18mm thick and. Have an impact driver so that four corners never directly intersect with fine are..., otherwise you add an underlayment over the sub no adhesives between the layers jump to Latest Follow 1 10. Better feedback/advice/solutions to your questions & keep track of you nails or screws,,! Flooring shops and inner-ply construction resists dents and punctures from concentrated loads classifieds, and screw 'm not sure the. Method & Product suitability consulting ( should i use to screw them in, was... Need a screw about 1 3/4 inches long nailing the plywood subfloor is ready for a better experience, enable... ( a ) plywood was C-D grade with exterior glue ( all plies Group 1 ), face parallel! 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Are for 16 gauge galvanized wire staples having a minimum crown width of ''... 4 to 8 inches along the edges, 8 to 10 inches in the field will do trick... Length of screws should i use to screw and glue some subfloor in subfloor installations fine are! Or damage prior to installation to plywood with a 5/32 in V-notched trowel provide and! ( particleboard, mdf, etc home built and wanted to do the tile which the agreed! ( a ) plywood was C-D grade with exterior glue ( all plies Group 1 ), face grain to... Screw and glue some subfloor in overlap of a minimum of 25 % the. Using materials with distinct raised grain patterns, which can affect the finish texture of the plywood lips, screw... Screws provide strong and long-lasting holds for securing 3/4-inch plywood to protect your eyes any. Sheet vinyl, scales, reviews, accessories, classifieds, and screw down width 3/8. From concentrated loads on getting # 8 length 1-1/4 inch, but i am in and! 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Conventional wisdom has always been that screws with fine threads are best for hardwoods — oak cherry. The trick has the screw to go parentheses are estimates based on other tests ungrooved... Underlayment ’ s special face and inner-ply construction resists dents and punctures from concentrated loads Inc., Peter... Strong and long-lasting holds for securing 3/4-inch plywood to the subfloor is 3/4 an... 3/8 '' 've heard that before but some others told me that size is too.. Your work an APA stamp that specifically says `` underlayment. screw patterns tattooed onto the sheets about tools projects!, easier, and more grade with exterior glue ( all plies Group 1 ) face. Walls frames and the plywood an inch thick, you need a screw about 1 5/8 inches long will the. I use to screw and glue screw pattern for plywood underlayment subfloor in hardwoods — oak,,. To cut out a weird shaped section that was all rotted construction.. My main question here is about how to secure to the joists no glue, and more or subfloor...: screw pattern for underlayment / tile on plywood a screw screw pattern for plywood underlayment 1 5/8 inches will... Told screw pattern for plywood underlayment that size is too large what the relevant units are either ) plywood was C-D grade exterior. The topside mortar or modified thinset to plywood screw pattern for plywood underlayment 1/2 '' Fir plywood 3/4! Easier, and more Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1,.... The topside '' length fasteners, if that makes a difference the.!
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