subfloor thickness for shower pan

If you're working against an existing concrete floor where tile is going to be applied directly onto the surface of the slab, there are a couple of options. Learn more about the essentials of waterproofing. Use only a little bit of water at a time to maintain a stiff, peanut butter-like consistency. Which was the first Sci-Fi story to predict obnoxious "robo calls"? Making statements based on opinion; back them up with references or personal experience. The nominal 5/16 (8mm) thickness minimizes tile assembly thickness. Press the material firmly into the silicone on the shower drain. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. This is a dialog window which overlays the main content of the page. The KERDI-SHOWER-TT shower trays feature integrated KERDI waterproofing and are designed to integrate with the KERDI-DRAIN. I've never heard of doing this. The dimensions will be about 40" x 10' (mud shower pan over entire area). If you were going to tile the rest of the room, I'd consider adding another sheet of ply, at least 3/8" thick (the thinnest suitable to a second layer with tile) under the whole floor. 1. We benefit by helping you find what your looking for and are paid a small amount when a purchase is made on a sellers website we link out to. 2. Wood floors first need to be able to withstand the weight of a custom walk-in shower. Does the 500-table limit still apply to the latest version of Cassandra? Prefabricated shower tray: Schluter-KERDI-SHOWER-T/-TS/-TT, 3. Similar to the lower mortar layer that you created earlier, mix the mortar in the mixing tray, then dump it onto the floor of the shower. Hassle with 5/8" first layer, especially with OSB, is that it's very easy to strip the hole with the screw. Uncoupling and waterproofing membrane: Schluter-DITRA. With the KERDI-SHOWER-TT thin shower tray on a wood subfloor, you can build up the rest of the bathroom floor by installing either a 5/8" or 3/4" plywood/OSB panel on top of the wood subfloor along with DITRA or another Schluter-Systems uncoupling membrane. Once it dries, it creates a waterproof barrier over which you can install the tile. This only applies to mud-floated showers. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Let the primer dry. Alternatively, add small amounts of mortar to fill the low spot and repeat the process. Ask an assistant to help position the shower base or pan in place, with the hole for the drain centered over the drainpipe or hole in the subfloor. Step 1: Reinforce the shower pan. 75mm) up to 75 mil (1. Thus, additional measures must be taken to protect wall cavities from water and vapor penetration. The shower pan should be slightly larger than the drain assembly. A recessed shower floor allows for the installation of a sloped mortar bed or a prefabricated shower tray that is flush with the rest of the bathroom floor. With lengths from 20" to 72" (50 cm to 180 cm) in 4" (10 cm) increments, KERDI-LINE can fit virtually any shower design. TileTip.com is your premier source for tile information and all the remodeling questions you have before, during, and after the installation. This means that you will have a steeper slope on the walls closer to the drain. 1. Hardwood Flooring. Different options and thicknesses of DITRA membrane are available to best suit the needs of your project. The first step is to determine the depth of the shower pan. If the liner doesnt leak for the 15-minute duration of the test, it passes. While the KERDI membrane is used in the image above, note that KERDI-BOARD multifunctional building panels are also suitable. Mark a piece of 1-by-4 pine or fir as a leveling rod for the mortar, using the 3-foot level. Three sides of the shower pan are bounded by shower walls. Subfloors provide the necessary support for the shower pan and prevent any shifting, settling, or warping in the future. The KERDI-SHOWER-TS features an off-center drain placement and is 1-1/2" (38 mm) high. KERDI-LINE is an elegant, low profile linear floor drain specifically designed for bonded waterproofing assemblies. But you did not actually answer his question. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Making statements based on opinion; back them up with references or personal experience. Use the scrap piece of two-by-four and level to continually check the tapered slope. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. This secondary layer can be added on top of the running boards or concrete slab. If necessary, lift the pan or base out of the way and install additional deck screws or level a low spot. What to use to flatten and prep wall before installing Schluter Kerdi membrane for tiling? Alternative, proprietary products are also popular and can be approved locally. Usually installers prefer to start with a half-inch of mud around the drain and slope their way upwards from there, roughly 1/8-inch per linear foot. You can now add the rest of the cement boards down to the level of the mortar bed. In order to pull this off I would need to add joists that line up with the dimensions of the shower. How do you expect to prevent steam from getting everywhere? The curb is the open entry point where the user enters the shower. With the liner installed and visible, the next step is the leak test. When an inspector shows up to do the rough-plumbing inspection and sees a two-part drain in place, it triggers a future inspection that not every house receives: a shower-liner inspection, detailed in section P2503.6 of the IRc. The KERDI-SHOWER-LT accommodates the KERDI-LINE drain at intermediate locations and is also offered in a selection of sizes with thicknesses ranging from 1-1/4" (32 mm) to 1-7/16 (36 mm). Did the drapes in old theatres actually say "ASBESTOS" on them? KERDI-DRAIN grates are available in four stylish designs and multiple finishes. Oatey's shower pan liners are offered with either CPE (CPE pan liners are recommended if your floor has a radiant heat system) or PVC sheet material at 30 mil. 399K views 1 year ago Dry Pack mortar or Deck Mud, as it is called in California, is an important step in the construction of a tile shower pan. Waterproofing strip: Schluter-KERDI-BAND, 5. Free-space on the underside of the matting provides a route for excess moisture and vapor to prevent damage to the tile layer above. Build a high border around the perimeter of the shower, about 1/4-inch below the tile top perimeter line. What do I do about the Missing Stair Nosing and Short Stair Tread. Though you can make your own shower pan, our experts say this project is best left to professionals and experienced tile setters. The tile is set in a thin bed of mortar or thinset. Then you have to waterproof the pre-sloped mortar bed with either a liquid applied membrane or a sheet membrane. However, if you are building a second story walk-in shower that is larger than 4 feet square, you should contact a structural engineer to make sure the second-story joists can handle the weight of the add-on and what shoring (if any) needs to be done. Waterproofing corners Schluter-KERDI-KERECK. He studied architecture at Taft Junior College. Jan 21, 2021. Where theres no curb at the threshold, as in a curbless design, a temporary curb must be constructed for the leak test. This can be tricky to set up and should be planned for ahead of time when building a curbless shower. A piece of plywood can be purchased in 1/2 or 3/4 thickness, and most cement backer boards will be 1/4, 1/2, or 5/8 thick. Install KERDI-LINE adjacent to the wall, or at intermediate locations of your shower floorand then choose the drain grate that best matches your dcor and desired finished look. Though few enjoy being tested, leak tests should be low-stress occasions because the installer has the answer key. The first and most popular because of its affordability and ease of installation is paint-on latex waterproofing. This liner is the last line of defense between water and the subfloor. Learn more about the essentials of waterproofing. There are no special qualifications necessary to observe a wet floor, so the inspector should have little to do other than nod at a full pan and a dry floor. If you use the DITRA and cover the seems that should be waterproof so there really should not be moisture getting to the subfloor. We have to step up to go in shower!!! Continuing Education for Architects & Designers. Most homes will consist of a standard subfloor constructed of running boards laid over floor joists, a plywood layer over the running boards, or if on a first floor, the subfloor can be a concrete slab. Tiling Project Guide. However, if you hear the term shower base, that is the portion that sits below the tray/pan. Seal the shower liner to the shower drain. IMHO, if you will be tiling the floor I would put a water proof membrane under the entire floor and not worry about using pressure treated wood for the subfloor. Alternatively, you can choose to install a cement backer board as your subfloor or as an addition for support and structure. If you're planning to install a shower base or manufactured shower pan on a subfloor, it's necessary to make sure the pan will be level and stable. This is normal. It is important to remember, if you choose a cement backer board, you will need to use the manufacturer recommended backer board screws. Place a full sheet of plywood onto the joists with the 48-inch end against the edge of the cutout where a floor joist runs below the edge. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Would you ever say "eat pig" instead of "eat pork"? * Recessing the floor of a shower must be done in a way that preserves the structural integrity and safety of the construction. Counting and finding real solutions of an equation. Premanufactured kits do not weigh enough to be of concern, so you can go directly over the existing subfloor (plywood or OSB). This question is specifically about the subfloor. JavaScript is disabled. What does "up to" mean in "is first up to launch"? 22K views 1 year ago Installing an acrylic or fiberglass shower pan using a mortar bed increases the strength and longevity of your shower pan. Remove any residual mortar by hand or with the trowel. Required fields are marked *. Shower bases must be sloped from all directions to point drains, therefore limiting tile selection to mosaics or other relatively small-format tiles. For curbless showers without such a dam, the floor-level threshold at the opening serves the same purpose. I think The Evil Greebo does bring up a good point, because this is a steam shower I would be even more concerned about mold developing in this humid environment. Hold the 1-by-4 rod on edge against the surface of the subfloor and move it across the surface of the mortar in a sawing motion. This includes mud-floated showers. To learn more, see our tips on writing great answers. This may require the services of a qualified design professional (e.g., architect, engineer, etc.). Unless you waterproof the entire room floor, walls, and ceiling, steam induced moisture is going to penetrate SOMEWHERE to wood. The only time you won't need a pan is if you have a fully tiled wet room space without a shower enclosure. Litigation and Insurance Claims Investigation Services. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Joists I'll likely epoxy and sister before installing new subfloor. What is Post-Tensioned Concrete and Can I Install Tile Over it? Free-space on the underside of the matting provides a route for excess moisture and vapor to prevent damage to the tile layer above. Depending on the size of the shower it doesn't always work, but it saves time if you can work it out that way. Field-fabricated shower pans (or receptors, as the code refers to them) have been acknowledged by plumbing codes at least as far back as the 1955 Uniform Plumbing code. Apply some mixed mortar at the marked area of a low spot on the subfloor. With a screw gun, install 2-inch deck screws alongside each existing nail or screw to securely fasten the subfloor to the joists. The studs were rotten, the subfloor was rotten, and the top of the joists (in some places) were weak and rotten. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. All shower trays feature integrated KERDI waterproofing and are designed specifically to integrate with the KERDI-DRAIN. With the rest of the shower drain temporarily in place, draw a pencil or chalk line around the perimeter of the walls to add a reference line, which represents the top of the tile. Write CSS OR LESS and hit save. The grate assembly accommodates a wide range of tile thicknesses and allows lateral and tilt adjustment as well. Use the scrap two-by-four to help estimate the slope from the walls down to the shower drain. tar command with and without --absolute-names option, Embedded hyperlinks in a thesis or research paper. This is especially true when remodeling at an existing subfloor. Made of soft polyethylene and featuring an anchoring fleece on both sides, KERDI is easily anchored to the substrate using thin-set mortar. The objective of this piece of paper is to provide a layer of moisture-inhibiting protection on top of the wood so that when you put the first layer of your deck mud in place to slope to the drain, the wood does not soak up the moisture and cause the concrete to dry too quickly. One side will be resting on a wall, the other side the joists will be hung using strong-ties or the like. KERDI is specifically designed as a waterproofing membrane to be used in conjunction with ceramic and stone tile coverings. They might begin to flex a bit, which may need a fix. It will never come into contact with the pan liner. I plan on replacing some studs and sistering others. Not out of concern for spilled water but because it's a steam shower, so your overall bathroom is going to become a playground for mold. Walk-in showers are large showers that can either be created from scratch or built using premanufactured pans and wall panels sold as kits. With the flat trowel, taper down the mortar towards the shower drain. Waterproofing membrane and vapor retarder: Schluter-KERDI, 4. Install the Subfloor. in reply: 1) Lawrence Taylor - The subfloor is the first layer of plywood over the joists, which I lowerd about 1 1/2 inches by removing 2-by material that was put over these joints by the last guy who remodeled this bathroom. DITRA-HEAT-DUO features an integrated bonding fleece that provides sound control, as well as a thermal break. By clicking Accept All Cookies, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts. When choosing your subfloor material, take into consideration how the thickness will effect the overall heigh of the built up shower pan in relation to your shower curb. Curbs must be at least 2 in. DITRA is specifically designed for ceramic and stone tile installations. This site is protected by reCAPTCHA and the Google. DITRA performs all these functions while still providing adequate support/load distribution for the tile covering. The finished floors of showers can slope up to 1/2-in- 12; anything steeper could be a slip hazard. Specifically designed for ceramic and stone tile installations, the family of DITRA products provides effective uncoupling protection, preventing cracked tiles and grout. One side will be resting on a wall, the other side the joists will be hung. Actually will be basically a fully tiled wet room. The modal window is a 'site map' of the most critical areas of the site. But a shower pan isn't just about function. What were the most popular text editors for MS-DOS in the 1980s? The top shower pan floor covering is the tile. Whatever the product, the liner must extend at least 2 in. In order to add support and reinforce the subfloor structure, you can add a secondary layer that the built up shower pan will sit on top of. Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine. I think our shower tile guy made this base too thick. joists where the wall studs are offset from 2 of 3 joists? Mix it thoroughly with the trowel to remove any clumps. 1) The metal lath or reinforcement can be placed over a cleavage membrane on top of the subfloor. Is there any way to alleviate the movement from the hangers? 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 the matting. Become a member and get unlimited site access, including the The subfloor needs to be a minimum of two layers of 3/4-inch exterior grade plywood before you can move to actually putting down the concrete layer of deck mud that provides the slope and the base for the shower pan tile. Should I redo this wall to avoid a mold sandwich? Multifunctional building panels: Schluter-KERDI-BOARD, 4. Ideally you would need to cut single, large pieces and screw them into the running boards or concrete slab. Because they act as dams that can raise water level in the shower area, the top of an included curb becomes the benchmark for the height of waterproofing. Which language's style guidelines should be used when writing code that is supposed to be called from another language? If you are worried about it and need to use 1/2" sheathing for other reasons then just install 2x blocking perpendicular to the joist at a shorter distance on center, say 8"-12" O.C. or 40 mil. Profile that forms a splashguard in curbless showers. Sealing/Waterproofing between shower flange and hardiebacker, Short story about swapping bodies as a job; the person who hires the main character misuses his body. Premanufactured panels and pans as walk-in showers can be installed directly over the top of the concrete without any concern. Note: While the image below shows a wood subfloor, this is also achievable with a concrete subfloor. in the area of concern. After the drain is set into the shower floor, measure the height from the subfloor to the top edge of the drain, deducting the thickness of the mortar bond coat and tile being installed. Modern shower styles use offset drains or linear drains for a sleek look that keeps the drain out from underfoot when showering. Has the cause of a rocket failure ever been mis-identified, such that another launch failed due to the same problem? See Recessing the Shower Floor Technical detail here. Asking for help, clarification, or responding to other answers. DITRA is a polyethylene membrane with a grid structure of square cavities, each cut back in a dovetail configuration, and an anchoring fleece laminated to the underside. I am putting in a whole new floor, joist and all, and the span is the 40". There are many resources available regarding the techniques and skills required to assemble a quality site-built shower pan, but they often fall short in explaining the details required by modern plumbing standards. thickness, and include a range of dimensions such as: 5 ft. x 6 ft. 6 ft. x 33 ft. 5 ft. x 40 ft. 4 ft. x 50 ft. 5 ft. x 50 ft. 6 ft. x 50 ft. Waterproofing Corners: Schluter-KERDI-KERECK, 1. Sweep out any debris from sub floor. While the KERDI-SHOWER-TT shower trays are specifically designed for curbless showers, the KERDI-SHOWER-T and KERDI-SHOWER-TS shower trays, which feature thicker heights (1-1/8" [29 mm] - 1-1/2" [38 mm]) can also be usedseveral options are available to best accommodate your project. If the subfloor is not flat and level, apply a self-leveling compound following the . The dimensions will be about 40" x 10' (mud shower pan over entire area). Blocking allows you to run the waterproofing material up the sides of the shower, which creates the DIY shower pan liner. Then another layer of deck mud is added on top of the shower pan liner. Should I use liquid water proofing membrane over a standard shower mud pan? Uncoupling and waterproofing membrane: Schluter-DITRA, 5. How to Replace Shower Pans in Fiberglass Showers, How to Convert a Tub-Shower Enclosure to a Freestanding Shower, Life of an Architect: How to Build a Shower That Won't Leak, Today's Homeowner: Installing Tile Over a Wood Subfloor, The Floor Elf: How to Create a Shower Floor, Houzz.com: Doorless Showers Open a World of Possibilities, How to clean a showerhead, according to an expert. Wearing waterproof gloves, dump the mixed mortar onto the shower floor. Determine whether the floor needs to be leveled and mark the floor at the low spots. Uncoupling and waterproofing membrane: Schluter-DITRA, 4. Over a concrete subfloor use a bonded mortar bed of appropriate thickness to build up the rest of the bathroom floor. The Fora platform includes forum software by XenForo. First, am I correct in determining 1/2" as not enough support ? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. For professionals it looks easy, but only. If you're creating a custom walk-in shower, you must put down a layer of what is known as the deck mud, which is a 2- to 3-inch thick layer of concrete. Waterproofing strip: Schluter-KERDI-BAND, 6. Allow mortar to cure overnight before installing the base or pan. While cement backer boards are moisture-resistant, they are not waterproof. Water that gets into the mortar bed won't be able to drain out.

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