A cemented backed board with a thin layer of mortar can prevent water from seeping in. OSB creation process is similar to that of plywood. The only difference being, in the case of OSB instead of using wood veneer, strands of wood are pressed together using glue and hydraulics. As a result, you get a structurally sound board that has better water resistance and glue plays a big part in that. The only problem with OSB is its swelling around the edges when board comes in contact with water or any sort of moisture.
This is why not many people prefer OSB as their primary Subflooring material. Jeff, nice blog. One suggestion. For example, you might do it in this way: thinset Update: I now recommend Schluter Ditra. In this case you could add a strikethrough to the word thinset, and italicize and hyperlink Schluter Ditra to an updated post explaining it.
You could probably just do that to the first reference of it on the page, and maybe on any separate materials list if you also include them with a post. It really strengthens a blog to add those updated cross references, and also helps to keep older posts relevant.
Keep up the good work — you are doing a fine job. This is a simple and good way to install bathroom floor tile. I like both the ways you have mentioned in this blog to install floor tile. Thanks for sharing it. Jeff, Watched several of your videos.
Nicely done. I have concerns about the hardibacker sucking the moisture out of the unmodified thinset. Thans for the videos.
Also rotten wood will flex a lot and this will crack all the joints, and tear silicone caulk in the corners. If you use vinyl which is flexible and does not crack I'd go with 22mm marine plywood. Leave about mm 4" unglued. So when you walk on the floor and it flexes, the subfloor will move down a bit, but it won't pull the vinyl down, so it will stay attached to the silicone corner joint and not tear it off. If you take your current subfloor out, check under the tub for rot, also check the drain and all the fittings and joints while you're in there.
You should use plywood or OSB rated for "outdoors" or "marine" which means it's made with waterproof glue. First, why are you against tile? Wood can swell engineered is better, but still not great where bulk water is expected, and even vinyl has problems if water gets underneath -- there were lux vinyl tiles in the laundry room of a house we purchased, which was all cupping because of water seeping underneath.
Second, assuming you are using tile, I would recommend a waterproof uncoupling membrane like Schluter Ditra.
Btw, I am not a Kerdi employee, just a DIYer who has used this myself - it was quite simple to install. Options exist from other companies which may or may not be cheaper - e. Wedi or RedGard. Add baseboards made of the right materials ideally pvc, or at the very least real wood - no mdf, the right adhesive silane-polymer based like kerdi fix or sikaflex ?
EDIT: Specifically for the subfloor question - you can't rely on a wood subfloor for water proofing. But really you should prevent the water exposure in the first place. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Learn more. What type of subfloor will stand up to water in a bathroom?
Ask Question. The subfloor material you choose for your bathroom remodel should be of high concern. It is important because the subfloor needs to be able to withstand the high moisture levels in a bathroom, and not all materials can handle such a tremendous task. It prevents water from seeping into areas around the sink, toilet, and bathtub , which are more prone to exposure to water.
By choosing the right material from the start, your bathroom will stand a better chance of withstanding long term damage. Excess moisture in the subfloor is a common reason for early replacement of bathroom flooring, but it can be prevented by choosing the right material from the beginning. A subfloor is the lowest structural layer beneath the finished flooring. Installed directly over the joists, the primary function of a subfloor is to create a flat solid surface for the finished flooring to rest on.
Generally, this only refers to a layer of plywood but in the case of bathrooms, it includes an underlayment of concrete backerboard as well. Concrete backerboard helps protect the plywood from water damage and helps prevent bending that leads to cracked tiles and uneven flooring. Traditionally, exterior grade plywood has been the subfloor material of choice for many bathroom flooring projects. Plywood is made by gluing alternating layers of wood veneer. Nevertheless, plywood is still a wood product and is subject to the effects of excessive moisture in the long run.
It can stain, warp, swell, and suffer from problems with mold and mildew.
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