Questions tagged [thinset]

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Is it acceptable to remove freshly (1 day old) installed porcelain tile and reuse it to correct a bad layout?

With one day of installation work completed I checked the layout and realized it would result in sliver cuts along some of the main walls. This morning I stopped them from continuing work and their ...
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1 vote
1 answer
26 views

Could Regular thinset be used on Large format tiles

I have a full bag of regular thinset and want to use it for 1 foot by 2 feet tiles on floor. Could I use regular thinset or shall buy a bag of Large format tile thinset? Is there huge difference in ...
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2 answers
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Can Mapei type 1 thinset be used over RedGard waterproof membrane?

I used Mapei type 1 thinset in a shower area over a waterproof membrane (red guard) . The ceramic tile job is about done. I trusted a friend knew what he was doing that was helping me and after ...
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6 votes
3 answers
2k views

Why can't you install larger floor tiles without thinset/adhesive?

I can understand the need for adhesive for wall tiles. But if you have a flat floor, and medium to large tiles, why can't you just lay your floor tiles on the floor without any thinset and grout it. ...
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0 answers
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Thinset too dry before laying tile? Not dry enough?

Yesterday I laid 6x36 wood-look porcelain tile in my bedroom using a mapei ultraflex LFT thinset directly to the concrete slab. It's been 24 hours, and I am now pulling off the top tab of the spacers ...
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1 answer
290 views

Should one use modified thinset when using a waterproof membrane like Redguard?

As far as I understand they require us to use unmodified thin set when using Kerdi™ boards or the like. Because they are waterproof, in case you would use modified thinset this will trap the moisture ...
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Is non-sag mortar appropriate for large tile on walls?

I am learning about thinsets and their use. As far as I can understand when it says large tiles it basically means no sag. Now in my understanding a tile wont sag on the wall unless some horizontal ...
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5 votes
3 answers
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What do you use to mud the joins between cement boards on walls?

I am seeing contradictory informations.. .some use drywall mud others say use exactly the same thin set you plan to use for your tiles.
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118 views

Am I calculating the trowel size correctly here?

I am trying to calculate what trowel size (fast set thickness) I need in order to obtain a flush level between the tiles and the green marked area in the diagram below. Here is some context first: I ...
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perimeter/barrier/dam on thinset for self leveling compound

What product or methods can I use to create a perimeter/barrier/dam on thinset for self leveling compound in a doorway? I'm pouring 300sf in sections as the SLC has limited working time. Thermostrips ...
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Self Leveler Over Thinset Over Concrete

In the kitchen, I've removed the tile and would like to install new tile. The floor still has much thinset over concrete. The concrete has hydronic lines for heated floors, has metal mesh on the ...
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waterproof shower: waterproof pan or not?

I have a question about waterproofing our shower. We have a pre-slope, then the PVC liner, then the final mud bed. We are going to use the Aquadefense liquid waterproof membrane. We installed our ...
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My diamond cup wheel keeps spinning off when slowing down

I've run into a problem, I need to to remove some very stubborn thinset in my basement bathroom and also level some uneven concrete. I decided to try out the angle grinder method, I have a Bosch 1375A ...
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1 vote
1 answer
475 views

How should I transition between cement board floor and alcove tub?

Remodeling a bathroom and about to put in the floor. I have a plywood subfloor, and I'm about to install 1/2-in cement board on top, bedded in modified thinset spread with a quarter inch notched ...
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What is this under the backerboard?

I am currently working on demoing our kitchen and am not sure how to proceed. I recently did our bathroom and for the floor I left the old backerboard, chiseled remaining thinset, applied a self-...
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1 answer
58 views

Laying tile over small section

I have a small section in my house that acts as "utility closet" that does not have tile like the rest of the adjacent environment (sorry for the junk laying around): My plan is to use some ...
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1 vote
1 answer
550 views

Can I tape cement board with mastic instead of mortar?

In the past, I have mesh taped cement board with thinset. Is it okay to do it with mastic instead? The reason I would prefer it is to avoid mixing thinset in my own tub, as opposed to the container ...
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Is there anyway to prevent rust stains or staining of color on a house that has been German schmeared? (Thinset mortar applied to brick)

We applied thinset white mortar on the brick of our house using the German schmear technique. After a very very hard rain, we had some rust stains show up down the brick in areas around older gutter ...
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1 vote
1 answer
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Can I use liquid floor leveler on a previously tiled wood bathroom floor where I could not get up all of the thin set

This is a 8 x 5 bathroom floor on the second level. The wood subfloor seems to be in good condition, no movement, solid. One section all of the old thin set that came up very nicely. The rest of it ...
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1 vote
2 answers
520 views

How do I attach natural stone to backerboard in a shower

I am making a custom shower, planning to cut my own stone slabs from stones found in my area. They will be granite, quartz, some others, that I cut with my own saw. I'm wondering how to attach the ...
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0 votes
3 answers
5k views

Removing thinset from durarock backer board

My husband and I have a huge issue right now. Some guy messed up our tile job completely, so we are removing it all and replacing it ourselves (should have done it ourselves in the first place). The ...
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2 votes
2 answers
4k views

Is it better to use thin-set or self-leveling concrete on top of a shower pan, mud-bed to improve the slope and make it smoother for final tile layer?

Issue: I am looking to improve the smoothness of my my concrete mud-bed before I lay my thin-set and tile. The mud-bed has dried, but there are some dips and divots that make it difficult for me to ...
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2 answers
113 views

What to do about a tile floor that with globs of thinset

8 months after my general contractors had laid out the new tile on the bathroom floor, I noticed one of my large format tiles starting to wobble. It got progressively worse so I removed it and ...
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-2 votes
1 answer
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Is unmodified thinset ok for radiant heating under hardwood flooring?

So me and my dad are renovating and decided to add electric radiant heating in out living room/kitchen. We are following this video as a guide https://youtu.be/sXhT1fYVPps. They said to use latex ...
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2 votes
3 answers
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Concrete or mud pad below two layers of tile in bathroom. Not sure what it is and whether to demo it?

I recently started renovating one of our bathrooms. After removing a few tiles there was a second layer of tile beneath. Below the second set was a concrete/mortar base that is ~1.5 inches thick and ...
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3 votes
2 answers
558 views

When stopping and starting a tile job, what to do with the extra thinset from previous row's cleanup?

When stopping and starting a tile job, you are left with the cleanup of the thinset that extends past the tiles that have been set. This thinset can be scraped up with a trowel, but leaves a light ...
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2 answers
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Tile on the side of shower base

I saw this at a hotel where they tile on the side of the shower base which is fiberglass: My question is: Do I just tile directly on the side of the pan? How do I make the thinset to stick? Thanks.
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0 votes
2 answers
185 views

Tiling when some old vinyl sheet flooring is impossible to remove

When I remodel my basement bathroom and remove the old vinyl sheet flooring, I realized the current one was on top of another old one. And between the two sheet flooring layers, there is a thin layer ...
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1 vote
1 answer
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Can I use more sand topping mortar to level the slope of a shower pan?

I'm building a shower pan the traditional way using a pre-slope, then waterproof membrane, then a mortar bed using sand topping mix. I laid my mortar bed and curb and it has dried but I've noticed ...
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1 vote
1 answer
189 views

Do i need to worry about leveling the floor if there are dips no more then 1/8 "

I have a small bathroom ( 5' x 6' ) that i want to lay ceramic tile. I layed down the backer board and screwed down as recommended. I checked for level and i see that in some spots there are dips but ...
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1 answer
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Detaching large ceramic tile without breaking it

Do I have any chance of lifting the tiles you see in the pictures without breaking them? You can tell from the picture what I tried and how it went!
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Reduce Tiling Dry/Wait Times

I am tiling my kitchen floor and unfortunately it is the major walkway in and out of the house. Is there anything that I can do to reduce the drying and waiting times for the thinset (both for taping ...
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1 vote
1 answer
2k views

Should I remove old thinset to install backsplash in kitchen?

I've recently had new kitchen cabinets installed in my kietchen. I'd like to install a new backsplash as well, the old one has been removed as shown in the picture below: My question is - should i ...
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0 votes
3 answers
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can I install cement backer board over plank subfloor

I have old plank subfloor installed at a 45 degree angle to the floor joists. How should I install cbu(cement backer board) on top of this for a tile installation? The entire area is approximately ...
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1 answer
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broken cement board corner

i installed a cement board with a badly crushed corner. how should i proceed? This is for a shower it will be waterproofed with redguard (or equivalent). There is studs behind the screws on the ...
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1 vote
2 answers
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Can I use Kerdi Board instead of Cement Board to thinset natural stone tile?

I've got these split face natural stones that come in 24 x 6 panels, and I was going to install them onto Cement Board using thinset. Checking the boards out (Permabase Plus), they contain silicates ...
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1 vote
3 answers
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Fix uneven tile

My first tile job has not gone according to plan. This was my previous post on preparing the underlayment for the small mosaic tile. I pulled up the OSB and replaced, re-secured the subfloor, ...
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1 vote
1 answer
933 views

Can I use cement accelerator to decrease setup time of modified thinset

I am installing larger format Porcelain Tile (18"x18") over ditra on a plywood subfloor. I do not want to use unmodified thinset like they recommend. The TCNA says modified in their installation ...
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0 votes
2 answers
3k views

Remove tile adhesive to get to screws on cement board

Looking to remove thinset / tile adhesive from the backer cement board in the tub area. I want to replace the cement board as it got damaged while removing the tiles. The problem is, the tile ...
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1 vote
2 answers
4k views

How can I remove or level grooves in thinset mortar from a concrete slab?

I'm redoing my bonus room, it's close to 300 sq ft and the floor is all concrete. Most of the room had carpet which came off easy but about 130 sq ft had ceramic tile that left a lot of thinset ...
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3 votes
2 answers
2k views

Mixing or blending diverse tile thinsets together

I would like to know if it is ever an acceptable practice to mix or blend two diverse thinsets together, and under what circumstances one may resort to this practice (outside of desperation to finish ...
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1 vote
2 answers
3k views

What should I use to raise the height of floor tiles in a shower?

Initially, the wall tiles were installed too high off the shower floor so if floor tiles were installed, there would be a gap at the bottom of the wall tiles to top of the floor tiles. I hired a ...
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2 votes
2 answers
5k views

Do I also need to apply thinset to my Subway tiles or is it enough to just put it on the wall?

Subway tile question regarding a bathtub surround. Do I need to apply thinset on the back of the tile? Subway tiles are small, can I just put thinset on the wall and apply the tiles? Thank you
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1 vote
1 answer
271 views

Gaps created by cement-board being further that the bathtub-lip when tiling?

My installation: Cement-board = over the bathtup lip. There's one-two spots where the cement-board is not not flush with the bathtub lip creating gaps behind few tiles are supposed to be. Can i just ...
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0 votes
0 answers
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Sound insulation for tile floor: Laticrete or NobleSeal SIS? Do I need backerboard

This will be the first time I do tiling myself. The bathroom subfloor is concrete I believe. I am on a condo top floor so will need some sound insulation. I am leaning toward Laticrete 125, but it ...
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1 vote
1 answer
706 views

What is the Best mixture ratio of Portland cement Quartz sand and bonding agent for under water application

I'm installing a ceramic mosaic in the bottom of my concrete pool and wondering what is the best mixture of white Portland cement Quartz sand and a bonding agent to apply this mosaic. Can I just use ...
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2 votes
1 answer
2k views

Does all wood glue need to be removed from a cement floor to use thinset to seat ceramic tile?

Does all wood glue need to be removed from a cement floor to use thinset to seat ceramic tile? We've chiseled it smooth with an air tool. If the old wood cement was water-based will thinset set?
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1 vote
1 answer
259 views

How long should thinset dry before gluing up tub surround?

I replaced the walls in my bathroom and used concrete board around the shower. I plan on finishing the concrete board joints with the proper mesh tape and (premixed) thin-set as recommended but ... I ...
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2 votes
1 answer
363 views

Do I need to use a waterproof sealant in my entryway?

Do I need to use a waterproof sealant in my entryway, over the backerboard and under the porcelain tile or is the thinset adequate? Sub floor is above grade, 3/4" plywood. thanks!
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2 votes
2 answers
8k views

Mosaic installation: thinset excess spilling between the gaps

I'm currently placing mosaic on a concrete staircase. When I push the tiles into the thinset often the thinset is spilling through the gap. I'm removing the excess with a brush which is annoying ...
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