All right, so welcome to part two of How to
Install Schluter KERDI-BOARD. In this video we’re going to complete the project and
show you how to make it entirely water-proof. So let’s jump into the tutorial right now.
Okay, so now we got all the wall board up. Now all your seams need to be covered with
the KERDI, and you’re going to thinset that in. What I recommend when you get that KERDI-BAND
is pre-cutting everything to fit rather than trying to fit it in after the thinsetting.
Because one thing is if your utility knife scores any of this, then you’re jeopardizing
the water-proofing. And it could be kind of cumbersome once you’ve got the thinset in
and try to cut this. So I recommend trying to cut all the pieces you need. Now you need
it for all the seams. You need it for around the niche because there’s a seam there as
well. And you’re going to need them for every screw hole that you put in. And for
those, all you need to do is just basically making a little square. So this actual membrane
is 5”. So 5” x 5”, 5” x 4”. Something like that. So cut a bunch of these so that
you can go over every screw hole that you punctured into. So we’re going to pre-make
all those before we mix up the thinset. Okay, so you have to thinset all the KERDI-BAND
over the tub flange, where you’re going to fill in over the KERDI-BOARD and the tub.
And then over every screw hole and all the seams. And what we’re going to use is a
product called Ardex X 77. Now this is a pretty high quality thinset. It’s a non-sag thinset,
not that that matters for the KERDI-BAND. But it is high quality. It’s a fairly expensive
thinset, but I like to use it because when you use it for mosaics, it’s non-sagging.
So say like when you’re doing a 12” x 24” tile and you’re going to do a 3”
mosaic accent in between. This allows that 12” x 24” to sit there and not move. So
you’re not putting all that pressure on that mosaic. So that’s the reason I like
to use it. Just be careful of what you buy. You want to make sure. If it’s not Ardex,
you want to just go with an unmodified if you’re going to go with another type of
brand. So the first mix that we’re going to do
is just going to be a little bit thicker so that we can fill in the tub gap. And then
the rest of it’s going to be fairly loose mix. You want to make it really—I don’t
want to say “soupy” but—something runnier than you would actually set tile in because
you want to be able to get this stuff as flat as possible. So you kind of want to make it
somewhat loose. But for filling that tub deck, we’re going to make it a little bit thicker.
I’m not going to use too much because I don’t need to fill
in that much. So I kind of want to make it
like pancake batter where it’s pretty thick and doesn’t really just fall off the trowel.
That’s kind of the consistency that I want just to fill in that tub deck. And then we’ll
add a little bit water to make this a little bit looser so then we can embed the KERDI
everywhere else. But you don’t want this stuff to sag out of that joint. We don’t
want that. I always like to start with my bottom band
and then do the corners going up the side of the wall. I guess it kind of just makes
sense where that corner wall—where the water hits the wall coming down—kind of flashes
over the bottom stuff, not that it really matters all that much.
I guess I should mention this is actually a KERDI trowel. Basically it’s an 1/8”
x 1/8” notch square notch trowel. But the Schluter brand they do sell the trowels for
their products. So 1/8” isn’t very much. It’s just really enough to embed that membrane.
So I’m just using a drywall knife to smoothen things out. You know I like to use just a
full piece for the whole corners so there’s no gap here in the corner. Make sure you’re
not bulging out of the corner. You want to make sure when you put your trowel in there,
that sits nice and tight. It’s not a bad idea for your first time, just pull this back
and make sure you’re getting good coverage on it. You want to make sure that you can
see that this is actually getting embedded into the thinset. Just re-notched it because
I pulled it back. But it’s not a bad idea just to double-check yourself. And you’ll
see it’s kind of just like drywall tape. You don’t have the seams that pop. But when
you coat with mud it’ll start to lift off. Take a sponge and wipe off your excess thinset.
In our video, Steve shows you how to fill in the gap between the tub and Schluter KERDI-BOARD
using unmodified thinsets. Now Schluter recommends filling in this gap between the tub and the
Schluter KERDI-BOARD using KERDI-FIX. So you would apply KERDI-FIX in that gap. Then you
would apply unmodified thinset on the KERDI-BOARD. And you would fill in that gap using your
KERDI-BAND. So that’s how Schluter recommends doing that instead of what Steve showed you.
Now we showed you Steve’s method because that’s what he prefers. But if you want
your warranty to be upheld by Schluter, you use their method.
The other thing that I wanted to show you is instead of poking a hole into the KERDI-BAND,
you can actually use a pipe seal that Schluter has. So you would slide this over the pipe—this
is a ½” pipe—you would put your unmodified thinset over the KERDI-BOARD, and you would
embed this into that, like so. Now alternatively, what you could do is apply Schluter KERDI-FIX
in this gap here. So you would just fill this in with Schluter KERDI-FIX, and that’s another
alternative way to fill in the gap between the pipe and the KERDI-BOARD.
So basically you trowel the corners like you would apply on mud with the trowel basically
and embed that in the corner. Now don’t overlap that bottom KERDI transition. This
is where it’s just kind of nice. You just fold this in half. It’s kind of nice having
this pre-cut so you’re not messing around with having to cut this in place.
See if you have a little gap like that. It’s not going to be any good. You got to make
sure that that gets filled in. It’s kind of easy doing it in the corner.
So the sponge is really just wiping off that excess to make everything smooth. You want
to make this as flat as possible for when you tile. I guess we have the corner seams
up. Now we’ll do the butt seams. So when you trowel this, have everything go
in the same direction. It’s a little longer, so I’ll have to cut this out. Make sure
you’re not cutting on the board. You need to keep it away. Once you puncture any of
this, it’s not water-proof any longer. So I need to get more in this corner here. So
overlap everything, too, by 2”. So wherever the KERDI is filling over, you want to go
over 2” over. Looks like I didn’t get that corner very well.
Okay then on all your screw holes apply some mud. I like just to putty knife it in. Doesn’t
matter which way you set them. You can set them however you want it. Just make sure those
are embedded. I’m just going to use smaller patches for up here at the top and seal it.
Okay, so now we’re going to do the seam against the drywall and the KERDI. I like
to have my tiles to come out to the side of the tub area just enough so that you don’t
have drywall meeting up against your tub. So 1 ½”, 2”. And if your using a bull
nose tile that’s usually the width that I go outside the tub. So anything that’s
sticking outside of that I usually put a piece of drywall tape. You can pretty much mud over
this, too, on the outside. So this seals around that tub pretty good. Definitely I want to
get the thinset off the drywall area to make it a little bit easier to fit your drywall.
Okay, let’s do the same thing to the other side.
It’s a good idea to cover this corner made with the KERDI just in case any moisture got
behind there. If you just troweled over the corner, and if moisture were to get behind
that tile in any way, it would just rot out that corner pretty quickly. It’s a cheap
steel constructed. So by water-proofing it, it ensures it doesn’t happen.
So I got a
little tear here at the bottom. It’s no big deal. It’s not like I have to get a
new piece. I can just KERDI over it. I got a little rip seam, so I’m just going to
patch it with the KERDI. And that’s what you could do with any instance that you screw
something up or say you got your utility knife in there, you can always just patch it up
with another piece. Now I wanted to show you that here’s our
mixing valve. If you want to completely seal this to make it water-proof, you can put in
a mixing valve seal in the space here. Now Schluter provides this. So what you would
do is place this over your KERDI-BOARD like so and then fill in behind it with the unmodified
thinset. Embed that into the thinset and then you’re good to go. Use a 1/8” x 1/8”
square notch trowel to embed the KERDI-BAND into the KERDI-BAORD. You can also a ¼”
x 3/16” v-notch trowel to do the exact same thing.
So Schulter makes both a ½” pipe seal and a ¾” pipe seal. So whether you’re using
½” or ¾” pipe, you’ve got two different kinds of seals for the pipes coming out of
the KERDI-BOARD. Again you can use Schluter KERDI-FIX to fill in this gap here, or you
can use the pipe seal. So once again, we’re just going to use the
flat side of the trowel to embed the pipe seal.
It’s 100% water-proof. There you go. So really only a couple of hours. I’m ready
to tile tomorrow. So this is a really fantastic way to water-proof your tub surround, and
it’s really kind of fool-proof. Anything you screw up, you don’t make a very nice
cut for any reason, just put a piece of KERDI over it. It’s not a big deal. So don’t
think if you didn’t cut straight or something’s off, it allows you to fix your goofs. Good
to go, thanks! All right, so that’s how you install Schluter
KERDI-BOARD in a bathtub or a shower. We hope that you like this video. If you did, give
us a thumbs up over on YouTube. That way somebody else can find the video, and it can help them
out. We come out with a brand new tutorial every single week on Friday, so you can subscribe
to our YouTube channel. And the other thing I wanted to tell you about
–and this is really cool—Steve and I work together to put Bathroom Repair Tutor up on
the Interweb. So why is Bathroom Repair Tutor so cool, and why would it help you out versus
watching videos here on YouTube? Well here’s the deal, when you subscribe to Bathroom Repair
Tutor, where you join, you get access to Steve and myself. So you could ask us questions
about your specific bathroom renovation. So not only do you get access to us, you also
get all the video tutorials that we collaborated on so you can watch those at your own pace.
And when you’re a lifetime member, you always have the ability to ask us some questions—anytime,
anywhere. So we really would love to have you as a member
of Bathroom Repair Tutor. It’s our passion to help inspire you to begin and complete
your bathroom remodeling project. So check out BathroomRepairTutor.com.
Thanks again for watching this video. We’ll see you soon.