In most cases, the job is easier with the help of an assistant. Should I apply waterproofer on the subfloor beneath a shower pan? How to Install a Shower Pan Liner: Build a Waterproof Shower from the While the 1955 code permitted site-built pans only in special cases where the installation of a premade pan was demonstrably impractical, such pans are now common and have their own provision in section P2709 of the IRc. No I would not apply water proofer to the subfloor under the shower pan (unless we are going to be waterproofing the entire floor it might be easier to just continue it under the shower pan). A major perk of site-built shower pans is that they allow the installation of custom tile, stone, or other aggregate floor surfaces. This may require the services of a qualified design professional (e.g., architect, engineer, etc.). Get home building tips, offers, and expert advice in your inbox. After the sloped subbase is in, the liner can be installed. Measure from the liner to the top of the 2 x 4. The same answer, I presume, is applicable to a dry pack pan as well? Make sure the surface is at a level. Increasing subfloor thickness under new shower pan Is it safe to publish research papers in cooperation with Russian academics? The base of a DIY shower pan needs to be about 2 to 3 inches thick at the edges before the tile is added. Premanufactured panels and pans as walk-in showers can be installed directly over the top of the concrete without any concern. The flange is a 1/8" thick, 5" high FRP composite MATERIAL that is designed to rise between the stud wall and the showers backer wall. 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. The lower area of the shower walls should be open, with no cement boards in place yet. DITRA-HEAT-DUO features an integrated bonding fleece that provides sound control, as well as a thermal break. With KERDI-BOARD, you can build custom vanities, shelving units, bathtub surrounds, free-standing partition walls, kitchen islands, and so much more. How to Create a Shower Floor - Part 1 - The Floor Elf What does "up to" mean in "is first up to launch"? Frame out shower stall area to shower pan dimensions. I am putting in a whole new floor, joist and all, and the span is the 40". Nail the top of the waterproof material to the studs to prevent it from falling. Waterproof, multifunctional tile substrate and building panel. Market Research for Exporting to the U.S. Catalina 2021 Ceramic and Stone Tile Market Report, Kitchen and Bath Cabinets Countertops Reports. Continuing Education for Architects & Designers. Unless you waterproof the entire room floor, walls, and ceiling, steam induced moisture is going to penetrate SOMEWHERE to wood. This can be concrete or closed cell foam. Blocking allows you to run the waterproofing material up the sides of the shower, which creates the DIY shower pan liner. Due to its thin perimeter height, the KERDI-SHOWER-TT is an ideal choice. Free-space on the underside of the matting provides a route for excess moisture and vapor to prevent damage to the tile layer above. The issue is that the previous subfloor was 1/2" ply over joists 17 1/2" OC - by my research, not enough support. Walk-in showers are large showers that can either be created from scratch or built using premanufactured pans and wall panels sold as kits. KERDI-DRAIN features an integrated bonding flange that provides a large contact area for adhering the KERDI waterproofing membrane and creating a secure waterproof connection at the top of the drain assembly. 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. 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. Donato is the founder of CTaSC. For a seat designed for sitting, that hazard could be argued as bather beware if he chooses to stand on it. Seems like 2-3 inches. 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. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. To learn more, see our tips on writing great answers. Once it dries, it creates a waterproof barrier over which you can install the tile. The entire room will be wrapped in Kerdi; walls, floor, ceiling Should I apply waterproofer on the subfloor beneath a shower pan? Can I do the typical 16"o.c. Use the existing nails or deck screws as guides to determine the locations of the floor joists below the subfloor. Place a 3-foot level on the floor facing from right to left, and again facing from front to back at the area of the pan. I ripped my old shower down to the studs and joists. Like all drains, the intent is for bulk water to drain through the visible drain opening. Learn more about Stack Overflow the company, and our products. I plan to use blocking, and I suppose I could put 2 pieces of blocking between each joist. 2023 The Taunton Press, Inc. All rights reserved. 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. Learn more about the essentials of waterproofing. Top-quality cast iron shower pans are very costly yet also very durable and can last for decades. Do I need to apply a waterproofer such as Redgard to the subfloor ply before I apply the thinset to set the Kerdi shower pan? Why don't we use the 7805 for car phone chargers? 1 Answer Sorted by: 2 1/2" is a bit thin to span that distance, although it should not be a problem with a concrete slab above it. Lay the waterproofing material on the floor of the shower, running it about five inches up each of the walls. What should I follow, if two altimeters show different altitudes? rev2023.4.21.43403. 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. Would you ever say "eat pig" instead of "eat pork"? To install the subfloor, whether it is the primary or secondary layer, you will need to accurately measure the length and width of your built up shower pan, also taking into consideration any non-square corners. These instructions assume you are building a shower pan on plywood subflooring, but if you are building a DIY shower pan on concrete slab, you will need to consider a riser kit. If the shower pan is done properly, I shouldn't expect water to get into the subfloor. otherwise I'd be in big trouble (even if it was treated). Generally speaking, the subfloor should be a minimum of -inch thick for any wet application. Cut out the hole for the shower drain. Where you have obstructions such as pipes, use one-by-six lumber or use a router to create a groove to accommodate the obstruction. Joists I'll likely epoxy and sister before installing new subfloor. If it comes apart, repeat the process. But a shower pan isn't just about function. For a better experience, please enable JavaScript in your browser before proceeding. Send us an email: , Using a Prefabricated Shower Tray and Ramp. Made of polyethylene, DITRA also serves as a waterproofing layer that protects moisture-sensitive substrates, such as plywood/OSB. It is important to remember, if you choose a cement backer board, you will need to use the manufacturer recommended backer board screws. Toe-screw 2x4s for straight curbs and cut off the excess hardboard after forming. Perforations or nails cannot penetrate the liner less than 1 in. Layers of a shower pan. This provides the bonding element for the concrete and gives it something to hold onto. KERDI-LINE is an elegant, low profile linear floor drain specifically designed for bonded waterproofing assemblies. Send us an email: , Using a Prefabricated Shower Tray and Ramp, 1. above the finished threshold. above the finished threshold, whether its at the floor level or on a raised curb. Over a concrete subfloor use a bonded mortar bed of appropriate thickness to build up the rest of the bathroom floor. Required fields are marked *. This liner is the last line of defense between water and the subfloor. A typical walk-in shower built on the first floor of a home will be able to rest its weight on the joists without concern. For professionals it looks easy, but only. I removed these and droped the 3/4 OSB subfloor only in the shower area. The downside of these finishes is that they arent themselves waterproof. Install the liner over the preslope & wrapping the curb, extending a minimum of 6" up the wall.