Ditra vs ProvaFlex
That’s right, I said typed it! Bring it on 
In the last month or so there has been a lot of hype about Loxscreen’s new polypropylene tile underlayment membrane. That’s just a big phrase for plastic tile underlayment. It is being marketed as a replacement product for Schluter Ditra.
Since I use Schluter Ditra almost exclusively as my preferred underlayment for floor tile I felt it would be a good idea to give this stuff a try. I did not do this in order to find a replacement for Ditra, I’m extremely happy with Ditra. I do feel, however, that due to the way this product is being ‘marketed’ to consumers and since it claims to be a replacement for a product I regularly use, people may want a professional opinion about the way it performs. AND! if there is something better out there – I want it.
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Since I’m just a tile guy I”m not usually up on all the new technological crap that has nothing to do with tile, like online video or the ‘SlapChop’. I’ve decided that since I spend most of my days in other people’s showers that I should get out more and learn something else.
So naturally, since I own kitchen knives, I decided to make a video about a tile subject. So here is my first video, sans sound because in audio I sound like a drunk leprechaun, for my readers. Umm – that’s you.
And since I actually have a day job and bills to pay all you get is a time-lapse photography of the creation of a mud deck for a tiled shower floor. But I’m gonna call it a tile video ’cause Google loves that shit. 
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Different types and styles of shower niches
Completed simple shower niche
Here is a photo of the niche I’ve used for these posts and these series of photos. If you simply want a regular hole in the wall the exact size of one tile this is all you need. If you don’t have any idea what the hell I’m talking typing about, start at the beginning here: Building a Shower Niche Part 1. More likely you’ll want to bling that bad boy out in order to make the neighbors and in-laws jealous, no?
That is what I will cover in this post. Hopefully you are reading this before you’ve cut a hole in your wall or anything else. The size, shape, location, just about everything depends on what you want your niche to look like. I will only be able to cover some very general examples since there are, literally, endless possibilities for a shower niche.
If you have any questions pertaining to your particular installation you can always leave a comment below. I do answer every one of them – I’m just super-cool like that. 
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Installing the tile
So now that you have a big waterproofed hole in your shower wall whaddya gonna do with it? (If you do not have a waterproof hole in your wall start with Building a Shower Niche Part 1 and Building a Shower Niche Part 2.) I’ll just kick back and finish my beer Pepsi while you read those.
Once your niche space is waterproofed you can do just about anything you want with it as far as design is concerned. That is not to say you should cut out and build the niche space then decide what to do with it – you need to know what you’re going to do with it before you start.
Run tile up to niche sides
The niche I’m using for these posts is simply an empty shelf in the wall. There are no additional shelves or design elements incorporated into it. We’ll get to that in a bit. This one is very simple, though. We will just place one full tile in the back and install bullnose pieces on the sides.
You can start by running the remainder of the wall tile up to and around the bottom of the niche and the sides. (I did not do both sides of my niche yet because of the distance to the back wall – you should.) Do not run the tile over the top of the niche yet.
If you’ve planned it correctly your grout lines should be lined up with the top and bottom of the niche like they are in the photo. Depending on your layout, design, or framing this is not always possible but if you can line them up it looks better most of the time.
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Waterproofing
Just look at you! Sitting there with a hole in the wall of your shower. What are we gonna do with you? If you do not happen to be sitting there with a hole in the shower of your wall read How to Build a Niche for your Shower – Part 1 and join all the cool kids. We’ll wait…
There, now you’re one of the cool kids. Now take your beer Pepsi off that niche shelf so we can waterproof it. You have a couple of different methods with which you can accomplish this.
Liquid Waterproofing Membranes
These products are usually readily available and fairly simple to use. Products such as Custom’s Redgard and Laticrete’s 9235, Hydroban, Hydrobarrier, etc. are all a thick, paint-like product which is brushed or rolled on to your substrate to waterproof it. You should only use these products if you are using a cementious backerboard as your shower substrate, they should not be used over regular drywall.
If you do have a cementious backerboard and choose to use one of these products for waterproofing simply follow the directions with whichever product you choose. Make absolutely certain that you get enough of the product in your niche to effectively waterproof it. The specifications vary but the best way I can explain it with a general rule would be the thickness of a credit card. Two or three good coats and you should have a layer on your substrate equivalent to the thickness of a credit card – that would be the correct amount.
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This four part series describes methods to create a niche in your shower wall for tile. Please read through all four parts before starting. Your layout dictates the size and placement of your niche. You need all this information before making a hole in your wall! Or don’t – it isn’t my shower, eh?
Framing
A shower niche, shelf, cubby, beer Pepsi storage, whatever you want to call it is one of the most requested add-ons for any showers I build. After all, everyone needs a place to store the important stuff – like your rubber ducky, as well as the unimportant stuff like soap and shampoo. So being the super-cool, quirky, lovable (with a healthy dose of jackassery) guy that I am – I’m gonna show you how to build one.
To the left you will see a photo of a niche with a shelf – we’re not gonna build that one. It’s just there to show you what you can do with the technique I am describing. I will explain how to do that in the last part of this series.
With any shower niche there are a couple of details you should pay attention to which will make it look like it belongs there rather than something you looked at drunk one night and thought “Hey! Let’s cut a hole in the shower wall so I can put my rubber ducky in there.” That’s not really a good look – rubber ducky or not.
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Look at this. Just take a good look at it. Click on it for a bigger version if you want.
That’s not wood.
That’s tile.
That’s cool. 
That’s so cool my dog just burst into flames.
And now I’m kinda pissy-pants because I had to pour my beer Pepsi on him to put his sorry ‘Oh-crap-I’m-engulfed-in-flames-again’ ass out.
Mutt.
Where was I? Oh yeah, the tile. That is a mural created by a tile ninja by the name of Marc from A Pile of Tile. I don’t know if that’s supposed to be him or not but if it is he’s in a bit of denial about the amount of hair he currently sports.
Just sayin’.
Lucky for you he does not have the hindrance of the whole ‘hair got in my eyes while I was cuttin’ your tile’ excuse I’m so fond of using. And if you ever actually see me or a picture of my head you’ll know I’m full of shit too.
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Your grout is cracking for one reason and one reason only: your tile is moving. That’s it. Okay, that’s not it – Unless your grout is non-sanded and was installed in the last 28 days – your tile is moving. That’s it. Yes, 28 days has significance, it is the amount of time it took my teenage son to clean his room. It is also the amount of time it takes for grout to fully cure.
So let’s figure out why your grout is cracking:
Your grout is newly installed – incorrectly
If you do have grout that was installed within the last 28 days then your grout is not actually cracking – it is shrinking. Either your grout lines are too large for non-sanded grout (smaller than 1/8″) or it was incorrectly mixed. NO! You cannot simply mix up more and fill it in. Read this post about adding more grout to your grout lines.
If your grout is not fresh, well, you need to repair the reason your tile is moving. And stop using your pogo stick in the house. Diagnosing the reason your tile is moving is extremely varied. It could be anything from inadequate deflection in your flooring for the type of tile all the way up to and including the aforementioned pogo stick.
The most likely reasons your tile is moving:
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Figure 8
Now that your floor looks like a can of silly string exploded (figure 8 ) its time to add more layers to it and cover up all your hard work. If you have not yet done all the hard work then your floor doesn’t look like that. Check out How to install WarmWire Part 1. I’ll wait.
Okay, you may want to check out a speed reading class. Just sayin’. 
My preferred method is Schluter Ditra underlayment installed atop the WarmWire for your tile installation.
The best method of leveling out your floor for your Ditra would be an SLC or Self-Leveling Cement. This product is mixed with water and poured over your WarmWire. When mixed properly (follow the instructions to the letter – really) and poured it will – wait for it – level itself. When cured you will be left with a level, flat floor.
You can actually install your tile directly to this layer if you chose to do so. I do not chose to do so. I prefer to have an additional uncoupling membrane above these layers then my tile. That’s just how I roll.
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One of the best upgrades for a bathroom or kitchen tile floor is the use of in-floor heating. There are several different products available to accomplish the coveted ‘warm tootsies when it is forty below’. One of the more popular products (around here, anyway) is the Suntouch WarmWire radiant in-floor heating. That’s just a really long term for wires that heat your floor (and warm your tootsies).
Now that I’ve used the word ‘tootsies’ twice in one paragraph I believe it’s time to move on.
As an ‘official’ reference the manufacturer’s installation guide can be found online in one of those fancy-ass pdf thingies HERE. It contains all sorts of things that you need to be aware of before starting your installation. While this post will walk you through how I do it, your installation may differ in aspects of which you are unaware. You need to read through the manufacturers information as well before you actually install you WarmWire.
This is as close as I’ll ever get to an official disclaimer: Be aware that the methods I use will differ somewhat from the manufacturer’s instructions intended for the do-it-yourselfer. I am a professional tile guy (really – what are you laughing about?) I accept liability with everything I touch in a customer’s home and accept that risk with the methods I choose to utilize. Read the manufacturer’s instructions before installing your WarmWire!
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The days of grabbing a three dollar bag of “thinset” and sticking floor tile right to the plywood in a bathroom are long gone (for professionals, anyway). For a proper tile installation you need a proper substrate. One of the most readily available are cement backerboards. These include products such as Hardiebacker, Durock, Fiberboard, wonderboard and a host of others.
When properly installed on your floor it is an ideal tile substrate for a quality and lasting installation. Notice I said typed “properly installed”? Laying them down on the floor and shooting drywall screws through them does not constitute proper installation.
Choose your weapon. I prefer Hardiebacker or Fiberboard. Whichever you choose make sure you get the proper thickness. With rare exception the 1/2″ variety would be the best choice simply because I like to overbuild stuff. With proper floor framing and deflection ratios, though, you can use 1/4″ to minimize height differences. This is not to say that 1/2″ adds significant sturdiness to your floor – it does not.
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Yup.
End of post.
Fine, I’ll elaborate . . .
To understand this you should understand what designates a particular tile as a ‘floor’ tile. A couple of different things determine this including the PEI Rating and Static Coefficient of Friction (that’s just fancy ass talk for how slippery a tile’s surface is).
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