Tile and Stone Types – Honed, Rectified, Gauged

by Roger

We, meaning us evil, scheming people in the tile industry, have a bad habit of using words that are not easily understood or recognized by the general public – and that’s a bad thing. Well, I think it’s a bad thing anyway, since the general public are the ones buying the tile – Hello, McFly??? Take for instance those three ridiculously nondescript words up there: Honed, rectified, and gauged – as well as the word ‘nondescript’. Okay, we’ll leave the last one out of this discussion.

Taken alone they each have very distinct meanings – easy enough. However, when used next to the word tile or stone, they tend to confuse. So I’m gonna try to clear it up a little bit for you so you know what a gauged slate is when you see it, as well as help you find the word you need when you know what you’re looking for but don’t know what word you need. (Is anyone else dizzy right now? No? Just me? okay…)


Honed is used next to different types of natural stone – most commonly with slate – as in ‘honed slate’ (didn’t see that coming, did you?) Although most common with slate it is also used with any natural stone product available. Honed stone simply means that the surface of the stone, has been ground to a smooth, flat, consistent surface. It also means, in the case of normally shiny stones such as granite or marble, that the polish or shine has been removed leaving a matte (unpolished) surface.

Slate Kerdi walk-in Shower in Fort CollinsIf you think about a slate tile (and honestly, who besides me, does that?) with its rough, textured, uneven surface, that would be an example of regular slate – not honed. If that slate tile were ground down with a smooth, consistent, flat surface it would be honed. Just like the tile installed in this Full Kerdi Walk-in Slate Shower with a Mountain Silhouette Relief  installed by Roger from Tile Art in Fort Collins, CO – TileArtCenter.com. 8)

That, by the way, was an absolutely shameless plug for a very excellent tile contractor – me. See, when I self-promote I don’t jack around. :D Unabashed self-promotion aside, that is a photo of honed slate installed on a shower wall. See how flat and unshiny it is – honed.

That was relatively painless, wasn’t it? Which brings us to our next obscure word…


Rectified is a term most often used with manufactured tiles such as porcelain as in, you guessed it, ‘rectified porcelain’. Natural stone tiles are rarely clarified as rectified because they normally are.

Rectified tile means that each tile is identical in size – length and width. As in each 12 inch tile is actually 12 inches – exactly. And each one is identically sized. Or, more accurately, if each 12 inch tile is exactly 11 7/8″ wide, they are all exactly 11 7/8″ wide. The ’12 inch’ part isn’t the important part – the ‘identical’ part is.

What is the difference between a rectified ceramic and porcelain and one that isn’t rectified, you ask? Glad you asked. A normal (non-rectified) ceramic or porcelain tile is formed and baked. This baking process will cause the tile to shrink ever-so-slightly and each tile may shrink a differing amount. This will lead to tiles that are not identically sized. Although the difference in tiles may be only 1/64″ or smaller, if you run a row 25 feet down a floor you may end up with a total 1/2″ difference overall.

Now this is not normally a problem and is dealt with as you are setting the tile by nudging each tile to where it needs to be to make up for this difference. If done correctly you’ll never know it’s there. It’s completely normal.

A rectified tile, on the other hand, is baked then cut to size. All the shrinking will take place during the baking process so after it is cut to size it will remain that size – forever. This makes it much easier, quicker and cleaner to work with and allows for a smaller grout line than may be required for a non-rectified tile. All rectified tiles are cut to an identical size. This is the reason that natural stone tiles are not referred to as rectified – they should all be cut to an identical size during the manufacturing process.

So, if you want really, really small grout lines and an absolutely straight, unvarying grout line, rectified tile or natural stone tiles are the way to go. They are so much easier to keep layouts consistent and lines exactly where you want them. Easier, in this respect, is relative since I prefer the smallest grout line possible with any given tile. The slate shower you see above has 1/16″ grout lines on the wall – this is nearly impossible to do with a tile that is not rectified. You simply have no room in the grout line to make up for inconsistencies in tile size.

*Note: not all slate tiles are rectified! Slate is the only (common) natural stone tile that is not normally rectified unless specifically stated.


Gauged stone is a bit more difficult to explain inasmuch as there are a number of things or descriptions of what constitutes a gauged stone. In the most common usage it simply means that each tile is an identical (or nearly so) thickness. This attribute, however, may also be referred to as ‘calibrated’ stone.

Technically gauged means that the backside of the stone has been ground down to a flat, or more accurately, consistent, rough finish. Going back to slate (since there are so many variations of slate stone it is the easiest example) it means the backside of the slate has been ground down to a flat, normally grooved, surface. This process makes each slate tile nearly (if it is calibrated) an identical thickness – usually within 1/16″ or so.

With most stone tiles this is not really a designation you need to look for – unless it is slate. Most all other natural stone tiles (granite, marble, etc.) are cut to an identical thickness. Slate is the exception because, for the most part, it is meant to have a natural, rough, uneven surface. If you want that – don’t be concerned with a gauged or calibrated designation. If you want tile like that shower wall – it needs to be gauged and calibrated.

So there you have it – the three obscure words badly explained in an effort to further confuse you. I do understand that for normal people – that is people that don’t stand in showers all day – there will still be a bit of confusion especially about the whole ‘gauged’ and ‘calibrated’ thing. If you have any questions about it at all please feel free to ask what the hell it is in the comment section below. If you are new to my blog I actually do answer every question around here. I’m just super-cool like that. 8)

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What brand and size of tile did you use in the above pictured shower installation? We have laid daltile slate that is uneven, but beautiful in a bathroom. My husband wants a more honed product, and your shower looks pretty similar to what we laid. Thanks



Hi Dolittlern,

I have no idea. I did that shower over seven years ago. I do know the slate was upwards of $20 per square foot. :D If you want an extremely consistent, honed and gauged slate like that it costs a shitload of money. And it will all be special order – no one is going to carry it in stock.



Hello Roger

Once upon a time, (yes, I’m that old) slate was an easy find. Go to any local flooring store, even the Walmart of home improvement, H.D., and the selection was overwhelming.
I don’t know if it’s my relocation to FL or marketing trends in general that have resulted in the dearth of choices available, whatever the cause, I’m frustrated by this situation.
I’m looking for gauged, rectified, multicolored tile for a bathroom renovation. I can find gauged multicolored but not rectified, unless I spend 8$ or so a square ft! Insane!
Can you suggest any reputable sources for slate? Additionally, I’ve read many horror stories of folks ordering slate from on-line resources and then they are stuck with 50% of their order cracked & broken & the cost of returning the product costs more than the original purchase price.
This isn’t my first rodeo, but at this point, it may be my last! Any advice would be helpful.
Andrea in FL



Hi Andrea,

I’m that old too! :D I you want slate like that you’ll pay out the ass for it – period. Look for a VERY reputable dealer and spend the money with them. Ask a lot of questions and make sure they know what you expect. Short of that I’m afraid I can’t be much help.



Thanks for confirming the depressing facts. The good news is the ax fell quickly, I’ll never miss my head as your reply was super fast & your aim true.
Stay well



So confused. Looking for mesh-backed mosaic-sized tile for floor of newly built shower. What level of waterproofing is necessary? Should it be porcelain or ceramic? PEI rating? Any other characteristics I should be looking for?



Hi Alex,

The waterproofing is beneath your tile, it has nothing to do with your tile. Several factors come into which tile to choose, they are listed here: Surface durability of tile.


Alyce Walsh

Re-modeling a small bathroom and kitchen and I want to use slate for the floors with white subway tile for shower and backsplash in kitchen. If the slate is gauged does it also have to be honed? I want to be sure of a proper fit as I have heard that there are differences in thickness in slate tile. Also, I don’t like to see grout lines. What do you suggest. Thanks.



Hi Alyce,

It can be gauged without being honed. Gauging it simply indicates that the overall thickness of the stone is nearly identical. Honed indicates that it is ground flat on the face. If it is both gauged and honed it will all be nearly identically sized.


maria wilkes

we are in the beginning stages of a major home reno. i want slate in my utility area, kitchen, falily room (rest of house is wood).

what can i go with in terms of being very very cost efficient and looking like real slate?



Hi Maria,

Florida tile has several porcelains that look, and some that even feel, like slate.


walter langsfors

We laid gaged 21X12 Vermont slate on our kitchen floor. It is all the same thickness but it is not flat. The slate was carefully laid but some of the corners are slightly raised above the adjacent piece. How should we specify our slate next time to get a flat floor. Walter L



Hi Walter,

Find a contractor who is familiar with the TCA handbook and the standards for setting tile. If you get a contractor who is a member of the ntca we are all familiar with what is acceptable.



Hi Roger,

Thanks for all of your help so far.

I am installing 10 x 20″ porcelain tile in a shower (3/8″ thick). When I put the long edge up against the rip fence on a bridge wet saw the tile it rocks back and forth. I checked the rip fence with a straight edge and the rip fence seems OK so I assume it’s the tile causing the problem.

Any tricks to making a square cut with a tile like this?

Thanks in advance. Matt



Hi Matt,

You would need to place it against the back fence of the wet saw and rip each side to make it square (assuming your back fence is square to the blade). Or, and the proper answer, return the tile and tell them you want SQUARE tile.


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