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minimum subfloor thickness for ditra

December 5, 2020

minimum subfloor thickness – 23/32", 3/4" nom. For joist spans 16 inches or less, NWFA recommends minimum panel thickness of 5⁄8-inch plywood or 23⁄32-inch OSB; the building code requires 5⁄8-inch plywood or OSB. Movement Joints DITRA-HEAT and DITRA-HEAT-DUO do not Maybe you can advice on something different all together. When in doubt, always increase the thickness of the underlayment. (19 mm) tongue-and-groove with 1/8" (3 mm) gap between sheets Substrate Preparation verify that subfloor panels are properly fastened to framing members any leveling of the subfloor must be done prior to installing DITRA and DITRA-XL Movement Joints DITRA and DITRA-XL do not eliminate the 5/8" scares me and is bare minimum under the best of conditions. Please call Schluter®-Systems (USA: 800-472-4588; Canada: 800-667-8746) to discuss your particular application if you have selected a smaller format tile. Why Use Schluter DITRA Tile floors…there’s no doubt they make homes look nicer. BUT should still hold a notch. Fibre board was normally used in mobile homes because of the reduced cost/weight! Schlüter®-DITRA 25 is a polyethylene mat with square, dovetailed recesses and an anchoring fleece laminated to the underside. If you had correctly used a ditra trowel or one of the stipulated options at the correct angle your mortar bed beneath the ditra should be just over 1mm. minimum subfloor thickness – 19/32", 5/8" nom. "F$H:R��!z��F�Qd?r9�\A&�G���rQ��h������E��]�a�4z�Bg�����E#H �*B=��0H�I��p�p�0MxJ$�D1��D, V���ĭ����KĻ�Y�dE�"E��I2���E�B�G��t�4MzN�����r!YK� ���?%_&�#���(��0J:EAi��Q�(�()ӔWT6U@���P+���!�~��m���D�e�Դ�!��h�Ӧh/��']B/����ҏӿ�?a0n�hF!��X���8����܌k�c&5S�����6�l��Ia�2c�K�M�A�!�E�#��ƒ�d�V��(�k��e���l ����}�}�C�q�9 Movement Joints DITRA-HEAT and DITRA-HEAT-DUO do not and in good condition is enough to meet minimum deflection standards of L360 for ceramic. If you put two layers of OSB, then the Ditra you're really building up the floor and can have issues where the floor levels don't match up. Or is it just lay ditra on 3/4” subfloor and tile? For tile, with joists 16" on center, the minimum subfloor thickness for Ditra is 5/8", but 3/4" is obviously better. joist spacing interior dry or wet areas Limitations minimum 2" x 2" (50 mm x 50 mm) tile for natural stone, see detail DH-W-S (page 6) and natural stone discussion (page 33) Requirements maximum spacing of joists, I-joists, or floor trusses is 16" (406 mm) o.c. To avoid buckling, subfloor panels should be spaced with a 1/8-inch gap at all edges and ends to provide room for naturally occurring expansion. For most installations you're good with just using a cement underlayment like Hardiboard that is secured to the subfloor with screws and laid on a bed of thinset mortar. 3) Check Before Installation: Once you determine the subfloor is the proper thickness, check that the subfloor is installed properly, with no issues that could affect your installation. I really, really do not want to mess with that wall. To avoid having to reframe a wall with a pocket door I'm hoping to cover the joists back up with new 3/4" plywood then do the ditra installation. My OSB plywood is ¾ inch or 19mm. Manufacture recommends that I use 16 gauge or 18 gauge 1 3/4” - 2” cleats. Laminate or vinyl planks require a "flatness" quotient of 3mm over 3meters (1/8" over 10ft) of floor height deflection. I would question why the fibre board was used in the first place. Only now is the subfloor ready for cement board underlayment. DC's Staircases, Custom Railings & Stainless Steel | 4x Best of Houzz! I wanted to be sure before I spent money on the project. I plan on laying down a 12"x12" porcelain tile, using Ditra for the underlayment. Schluter systems ditra heat sheet ditra heat mat installation ignore schluter ditra your uncoupling schluter ditra heat duo matting how to choose between ditra xl. minimum subfloor thickness – 23/32", 3/4" nom. Also, for a small minimum order size, the RPM mats come with free shipping within the continental US. For example, Schluter recommends wood subfloors have a minimum thickness of 3/8″. The subfloor provides a support structure for the flooring that will go on top of it, and to be successful, the subfloor needs to be strong enough to support the flooring. The existing subfloor needs to go as it is damaged thanks to a leak. I am preparing my subfloors for hardwood installation. Ooopsa. Most prefer a minimum thickness of at least 1-1/4 inch, such a ¾-inch t&g subfloor with ½ inch plywood underlayment. If using natural stone, you need more plywood. minimum subfloor thickness – 19/32", 5/8" nom. edit: Spiderweb is now Redgard Uncoupling Mat and, as a result, comes in a new snazzy red color! Thank you both for your advice. The reason is that those tiles cover so much area (each tile) that although the specs don't call for it (yet), the floor should be a bit stiffer than for normal ceramic tile. The absolute minimum thickness you can use on 400mm/16in centres is 18mm. DJ-- the 18x18's make a difference. I always use 3/4" T&G. Then thinset and tiles on top. I actually used a smaller 1/8 v-notch first because my tile was thicker than the typical ones, but that turned out too low. Need advice on Location for shower and sink. Let me know what you think, hopefully I won’t have to replace OSB plywood. Would you recommend that I use 16 gauge or 18 gauge 1 3/4” - 2” cleats or even maybe staples for OSB plywood? minimum 2" x 2" (50 mm x 50 mm) tile for natural stone, see detail D-W-S (page 8) and natural stone discussion (page 28) Requirements maximum spacing of joists, I-joists, or floor trusses is 16" (406 mm) o.c. Ditra is about 1/8" thick. Roll the Ditra Mat out on the shed subfloor and use a utility knife to cut it to the desired length and or shape. and in good condition is enough to meet minimum deflection standards of L360 for ceramic. Glue is sprayed between each layer and the sheet is hot pressed. A 3/4-inch plywood subfloor on a joist structure with 24-inch spacing needs the extra thickness of cementboard or the floor will flex and the tiles will crack. Tongue-and-groove edges on many premium floor panels, such as Weyerhaeuser’s Edge Gold ® OSB panels, are designed to self-gap. Looking for himalayan forest ledger wall tile. Stone needs more "protection" than tile. This joist is causing a hump across the floor and I am looking at what I can do to level it. For joist spans 16 inches or less, NWFA recommends minimum panel thickness of 5⁄8-inch plywood or 23⁄32-inch OSB; the building code requires 5⁄8-inch plywood or OSB. Subfloor. It is a problem all by itself. But between the joists is where the problem would exist, which is the reason for recommending the second layer of plywood. But while researching on the Schutler site, I see that they require T&G plywood with an 1/8" gaps at the joints in order to install ditra over plywood. We are remodeling our master bath to incorporate a whirlpool tub and separate shower. (16 mm)tongue-and-groove with 1/8" (3 mm) gap between sheets Substrate Preparation verify that subfloor panels are properly fastened to framing members any leveling of the subfloor must be done prior to installing Schluter®-DITRA Movement Joints with Schlüter®-DITRA 25 should have a minimum size of 5 x 5 cm and be at least 5.5 mm thick. Thin-set should be mixed to a fairly fluid consistency. (16 mm) tongue-and-groove with 1/8" (3 mm) gap between sheets. While Ditra Heat may be slightly thinner than RPM, the recommended trowel size for installation of Ditra Heat using thinset is a 1/4″ x 1/4″ square notch trowel. Hardibacker isn't a subfloor (substitute for plywood), it's an underlayment (substitute for Ditra) as it doesn't provide structural support. ��w�G� xR^���[�oƜch�g�`>b���$���*~� �:����E���b��~���,m,�-��ݖ,�Y��¬�*�6X�[ݱF�=�3�뭷Y��~dó ���t���i�z�f�6�~`{�v���.�Ng����#{�}�}��������j������c1X6���fm���;'_9 �r�:�8�q�:��˜�O:ϸ8������u��Jq���nv=���M����m����R 4 � The subfloor must be structurally sound as well as thick and stable enough to hold the weight of the tile without moving or flexing. (10 mm)-thick Exposure 1, plugged-face plywood or OSB with 1/8" (3 mm) gap between sheets; see page 16 for underlayment installation guidelines. Although they may still be ceramic, I'd still go with another layer of 3/8" plywood over the 3/4", and then the Ditra. Tile is installed over DITRA using the thin-bed method in such a way that the mortar becomes mechanically anchored in the square, cutback cavities of t… Once your subfloor is good to go it’s time to install the DITRA. If you can find the installation instructions on line to the brand of vinyl used AND YOU CAN PROVE to the builder the fibre board was INAPPROPRIATE then you can have all of the things done properly without much argument from the builder. If it IS measured to the edge then i should be fine with my current subfloor. Hopefully this will be enough? Build and Tile Curbless Showers with Professional Results … The second sure fire way to determine the thickness of your wood subfloor is to use a hole saw to … If the subfloor was new or almost new, you might get by with 3/8" ply. Other than that, I'd say a couple of inches from the walls wouldn't matter. We are not really interested in Gyp-Crete as there seems to be issues with it breaking down over time, and also seems to rely heavily on getting all the variables correct with the right installler. I think adding material to the area that is lower and then slowly sloping/feather it out is going to be the most reasonable "fix". As a consequence, tile coverings installed on top of Schlüter®-DITRA 25 are Ditra works like a dovetail joint. (16 mm) tongue-and-groove with 1/8" (3 mm) gap between sheets Substrate Preparation Certain "tiles" have the same flatness requirement as laminate. Substrate Preparation verify that subfloor panels are properly fastened to framing members. Framing, Flooring and Sub-Flooring - Question about subfloor repair/replacement thickness for Ditra Heat Tile job - Hello, I'm in the process of renovating our bathroom and need some help with If using natural stone, you need more plywood. N'��)�].�u�J�r� If you have an area where the tile stops and another flooring like carpet starts you will want to hold the mat back between 1/8" and 1/4" from the edge of the tile. Thank you, Rogue. After I screw down the existing 5/8" plywood to the joists, I am assuming I need to install an additional layer of plywood on top of it. My dilemma is how to estimate the thickness of the thinset motar base between the ceramic tile and the concrete backer & from the concrete backer to the plywood. (19 mm) tongue-and-groove with 1/8" (3 mm) gap between sheets. Will it be possible to shave off around 3mm or 1/8 inch? But what’s not so awesome are broken tiles. All the Best, Dasm, Before you pick up a single tile, pull from these tips for expert results, Putting a new commode in a bathroom or powder room yourself saves plumber fees, and it's less scary than you might expect, Learn what Energy Star ratings mean, what special license your contractor should have, whether permits are required and more, In this article, the first in a series exploring permit processes and requirements, learn why and when you might need one, Homeowners who aren't afraid of nail guns can tackle their own pre-hung door project in a couple of hours, Irregular tile heights can mar the look of your bathroom. We are planning to use the T&G for the new subfloor but there will be places where the new subfloor meets the existing subfloor. Thin-set should be mixed to a fairly fluid consistency. BUT should still hold a notch. Subfloor preparation and underlayment for hardwood installation, If you do not wish to (or can not) put in T&G ply, then install solid blocking at the short joints, so the entire edge is supported by framing. plywood subfloor with 16" (406 mm) o.c. --- Quoted from lenaitch 2. �V��)g�B�0�i�W��8#�8wթ��8_�٥ʨQ����Q�j@�&�A)/��g�>'K�� �t�;\�� ӥ$պF�ZUn����(4T�%)뫔�0C&�����Z��i���8��bx��E���B�;�����P���ӓ̹�A�om?�W= Is there a better way to do it rather than shaving it off? My subfloor is 3/4″ OSB Structurewood which I will be covering with plywood. Minimum Thickness, mm. underlayment – minimum 11/32", 3/8" nom. Don't skimp on the sub-floor - it's the subfloor which carries the load, not whatever fancy stuff you stick on top of it. Mary. Matter of fact, alot of T&G subfloor sheathing automatically gaps itself, kinda like wall tile. Subfloor is currently 3/4” thick. with Schlüter®-DITRA 25 should have a minimum size of 5 x 5 cm and be at least 5.5 mm thick. Here's how to counter the differences, Straight, diagonal, chevron, parquet and more. I can already tell that the living room side has a slope that is well outside this requirement. The thickness of my floor is a 19/32 ply. 3) Check Before Installation: Once you determine the subfloor is the proper thickness, check that the subfloor is installed properly, with no issues that could affect your installation. verify that subfloor panels are properly fastened to framing members. Schluter Ditra Installation Over Wood You. Thickness: One common misconception is that Ditra Heat is thinner than RPM. Subtracting the tile and ditra thickness leaves me with 3/8" left for thinset. The subfloor under the tile should be at least 1 1/8″ thick, with a minimum of 5/8 ″ thick exterior grade plywood topped by 1/2″ cement backer board. ... With a concrete subfloor you won’t be able to install cement board or Hardibacker over it as it’s not an approved substrate for that application. What are my options? Some of the manufacturers' installation instructions are confusing to me on the subject of installing over OSB and I wanted to get a better idea of how to phrase a question to get more clarification. Look on the bag for ANSI A118.1. Are you using Kerdi under your tile? Once your subfloor is good to go it’s time to install the DITRA. >> For the subfloor, since you've already had some problems, I'd also recommend 1/2" ply. Adhere the tile to the Ditra with unmodified thinset. I really do want to have the work done and not void any warranty, but I have asked several suppliers about installing their products over OSB. For joists spaced more than 19.2 inches on center, the minimum thickness for plywood is 7/8 inch and for OSB, 1 inch. n�3ܣ�k�Gݯz=��[=��=�B�0FX'�+������t���G�,�}���/���Hh8�m�W�2p[����AiA��N�#8$X�?�A�KHI�{!7�. Movement Joints DITRA-HEAT and DITRA-HEAT-TB do not The answers for engineered flooring glue-down installation also get varied replies. A 3/8-inch subfloor is the bare minimum … You would have to add something to the sloping area to get this floor in, you might as well float in mortar/SLC and feather it out so that you can install the floor you want. Column 3. Large format natural stone needs a subfloor over twice as stiff as for wood flooring. In general, most manufacturers say 5/8" t&g ply subfloor properly installed, 16" o.c. So the floor is originally carpet. It comes in smaller sizes, including a 3x3 mosaic. Not sure where you are building, but according to the Residential Code of NYS Table R503.1 Minimum Thickness of Lumber Floor Sheathing for 16" Joist Spacing requires a net min thickness of 5/8". I have only one that squeaks and I will fix it with additional screws. verify that subfloor panels are properly fastened to framing members. Which is OK only if my joists are 16 inches apart (according to the Ditra manual). The minimum height that my new dishwasher can be adjusted to is 33 3/4" and the cabinet height is 34 1/2". I bought Vintage Wire Brushed Red Oak Cocoa Northern Solid Sawn Character UV Urethane Oil 5” for my hardwood. Give Dirty Clothes the Chute, What to Ask Before Choosing a Hardwood Floor. The thicknesses are as follows: 7/16-, 15/32- … In conjunction with tiled coverings, Schlüter®-DITRA 25 forms an uncoupling, waterproofing and vapour pressure equalisation layer. Imagine taking days to grind that out only to find out (later...at greater expense to you) that you must now ADD material to get rid of the slope. Grinding will only get you into more trouble. If you put two layers of OSB, then the Ditra you're really building up the floor and can have issues where the floor levels don't match up. When NWFA Guidelines minimums are not met, the recommendations are to overlay the existing subfloor material with a 1⁄2-inch panel product or add structural support from below. As for your tiles, make sure to consult with a Store Associate on the trowel size that will be best suited to the size and thickness of your tiles. I also have one more issue. It comes down to the brand of vinyl you have installed. Do you recommend a bumper on the shower glass? any leveling of the subfloor must be done prior to installing DITRA-HEAT and DITRA-HEAT-TB. (19 mm) tongue-and-groove with 1/8" (3 mm) gap between sheets Substrate Preparation verify that subfloor panels are properly fastened to framing members any leveling of the subfloor must be done prior to installing DITRA and DITRA-XL Movement Joints DITRA and DITRA-XL do not eliminate the Laminate flooring: As with hardwood, laminate flooring is best installed on a 3/4-inch-thick plywood subfloor. /Length 2574 Joists are spaced 16"e;, span is ~12ft. PLUS you get to see a pro tile installer do it. For natural stone, you need more floor thickness under the Ditra. minimum subfloor thickness – 23/32", 3/4" nom. Substrate Preparation verify that subfloor panels are properly fastened to framing members. Update: Schluter just recently came out with their own line of Schluter branded thinset mortars.They have both modified and unmodified and approve their use with Ditra.

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