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17 votes

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

Let's assume your floor is really, totally, flat - to some absurd degree of precision. Guess what! Your tiles are not. They are nominally flat, but have slight deviations due to the realities of ...
  • 144k
11 votes

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

Thinset is required for several reasons: Thinset will fill any voids to provide an even support of the tile, regardless the tile's irregulariy or the floor's unevenness. Glue or thinset will ...
  • 11k
6 votes

What do you use to mud the joins between cement boards on walls?

The correct way to "mud the joints" is going to be to use tile thinset and a fiberglass tape made for cement board. It's similar to the sticky fiberglass tape made for drywall, but its ...
  • 26.8k
5 votes
Accepted

What do you use to mud the joins between cement boards on walls?

You have two situations: Cement board to cement board You use thinset with cement board tape (alkaline resistant)... not just "grey" drywall mesh tape. With a small gap I will push in the ...
  • 46.4k
4 votes

How do I attach natural stone to backerboard in a shower

Normally the stone is applied directly to the backer board once the pieces are set a grout is used between the stones (today I would recommend epoxy grout). After grout a sealer can be used , I have ...
  • 100k
3 votes

Mosaic installation: thinset excess spilling between the gaps

If you have a grout float a nice flat one that will work for pushing down Mosaic tiles into the thinset it because it's nice and flat and it'll leave your mosaics flat after you push down plus you can ...
3 votes

Can I use Kerdi Board instead of Cement Board to thinset natural stone tile?

All cement products contain silicates, from the sand use in the cement. It won't be breathable unless you create dust by cutting or breaking the panels. That being said, I don't see instructions for ...
  • 1,667
3 votes
Accepted

Reduce Tiling Dry/Wait Times

Some ideas: Use a faster mortar (or an admix designed to speed cure time). Finish the set in the evening to give it overnight to cure before foot traffic. Lay down blankets and then plywood/OSB after ...
  • 108k
3 votes
Accepted

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

Back-Buttering shouldn't be needed. But, the best determination is to set a tile & then pry it off. You should have a nice even smush of Thin-set that covers the whole back of the tile. If you don'...
  • 9,799
3 votes

What do you use to mud the joins between cement boards on walls?

You want to use thinset and tape designed for cement board. These materials are much stronger than their drywall counterparts.
  • 60.3k
2 votes
Accepted

Remove tile adhesive to get to screws on cement board

Finding and then using those screw heads is going to be a nightmare, so I would abandon the idea of removing the wall board semi-intact. Find the studs (with one of those cryptically-named stud ...
2 votes
Accepted

Detaching large ceramic tile without breaking it

I have had (some) success using the following technique: using a utility knife or grout saw, remove as much grout as you can using a narrow margin trowel (see pic) with a hammer, carefully tap the ...
  • 33.6k
2 votes

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

You will only need the backer board for your entry way. No other waterproofing needed. If it was your bathroom at the shower entrance, it would be a good idea, but since it will only be an occasional ...
  • 31.7k
2 votes

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

Bounce a golf ball all across your floor. You will hear the hollow spots. If your bad tile was not an exception, give the contractor a chance to fix it. He may have been screwed by a bad subcontractor....
  • 698
2 votes

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

I've never seen tile installed this way. I've seen installers glob it down, but then trowel it out. Tile needs to be installed on a flat, sound surface or it will "bend" and will break or loosen over ...
  • 60.3k
2 votes
Accepted

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

I think you have a good plan except do not fill the gap with thinset, leave a small gap between the cement board and the tub and fill with caulk. You could apply some of the Mapei on the first few ...
  • 13.3k
2 votes

Am I calculating the trowel size correctly here?

First you will for sure use a large notched trowel. But most importantly you will back butter each piece 100%. Also given your layout and diagram I would trust 2 out of the 7 guys who do tile work ...
  • 46.4k
2 votes

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

The manufacturers suggestions are what you should listen to. However... Their suggestions are often there for an "in case you messed up a little". Schluter (Kerdi) wants unmodified so ...
  • 46.4k
2 votes

Could Regular thinset be used on Large format tiles

The regular thinset (properly applied) will be fine on the tile side. Make the mix a bit stiffer to give more support to the heavier tile (don't mix it too thin). More of a concern would be on the ...
  • 3,702
2 votes

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

Generally the thinset has not developed full bond strength by that point, (take note, folks that like to walk on freshly tiled floors before they are done...) so reasonable to get it up off the floor ...
  • 144k
1 vote

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

It depends on the thickness of the thinset you are laying down. If you are doing a shower with large tiles and back butter in addition to setting I would do the following: Scrape off as good as ...
  • 46.4k
1 vote

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

I used a 3" scraper - nice flexible blade which left the minimum possible. When continuing the next day, just de-dust and fresh stuff straight on works a treat and did that for small tiles, big floor ...
  • 22.2k
1 vote

Tile on the side of shower base

The curb in this picture is about 3" wide. That is enough to put under the pan a piece of 2x4 (vertically) and screw a 1/2" thick hardie backer. Then you can use thinset to attach tiles to the hardie ...
  • 548
1 vote
Accepted

Tiling when some old vinyl sheet flooring is impossible to remove

I would rent a power chipper, these have a blade that vibrates back and forth that chips up tile or vinyl on concrete floors. Since a bathroom is small a hand held oscillating multi tool could also do ...
  • 100k
1 vote

Can I use more sand topping mortar to level the slope of a shower pan?

is adding mortar going to work? Yes, if you do it correctly. Rough up the existing surface where you intend to build up the pan height, then moisten well prior to adding some dry-pack to level off ...
  • 33.6k
1 vote

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

Ideally, you don’t rely on the thinset mortar to “float” tiles into level. You want to lay thinset down with the correct size notched trowel, and press each tile down firmly until the mortar stops ...
  • 1,099
1 vote

Should I remove old thinset to install backsplash in kitchen?

I installed subway tile with an accent strip around the top in a bathroom, and the drywall was severely damaged from removing the previous tile. I ended up doing a skim coat of drywall mud (there was ...
1 vote

can I install cement backer board over plank subfloor

Virtually all brands specify minimum 5/8" plywood or OSB as a base. I have to say, if it was my house and there were significant challenges related to plywood installation (plank removal difficult, ...
  • 33.6k
1 vote
Accepted

can I install cement backer board over plank subfloor

My experience is no, too much bounce. Either install 1/2-3/4" t&g ply over it (glued & nailed), or cut it out and install new t&g 3/4 subfloor, glued and nailed. Also consider your floor ...
  • 1,956
1 vote

broken cement board corner

Add mortar with either fiberglass or a kerdi membrane let set then add another layer of membrane to the corners as required for usual install.

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