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Old 01-29-2014, 11:38 PM   #1
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Tile Size - 20" vs 13"?


We are getting ready to tile the family room....about 250 sq ft....

We have a tile we like...comes in 2 size 20"x20" and 13"x13"

The wife likes the 20" better.....I think it's going to be harder to install....

This is going on top of concrete....nice and clean....pretty flat.

So....how hard is the 20" to work with? What are the downsides? Gotcha's?

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Old 01-30-2014, 05:09 AM   #2
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Tile Size - 20" vs 13"?


In one word? Lippage---

That floor must be flat as a pool table---(well not really but close)

Use a leveling system like Lash by qep----those will cure the lippage---

You will need a bridge saw ----

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Old 01-30-2014, 08:54 AM   #3
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Tile Size - 20" vs 13"?


Yeah, "pretty flat" isn't flat enough for large format tile. You'll need to do a lot more leveling to get it ready. And you'll need to use medium bedding mortar instead of thinset. That's more forgiving for lippage, but it's more expensive per bag. The leveling systems are pretty much a must as well. Also, you'll need to account for a larger % of wastage, so you'll need to buy more tile to begin with. It's certainly DIYable, but to do it well, requires a lot more time, tools, and materials.
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Old 01-30-2014, 06:12 PM   #4
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Tile Size - 20" vs 13"?


Just how flat do you mean by flat?

I would say that I don't any variation more than 3/32".

The slab I'm going to do is about 17'x14'. It's pretty flat.

Btw...the tile store said to use latter modified thinset
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Old 01-30-2014, 06:47 PM   #5
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Tile Size - 20" vs 13"?


I use modified thinset---also back butter the tile---1/2" x1/2" trowel---

Your floor is flat enough---
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Old 01-30-2014, 06:55 PM   #6
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Tile Size - 20" vs 13"?


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Originally Posted by oh'mike View Post
I use modified thinset---also back butter the tile---1/2" x1/2" trowel---

Your floor is flat enough---
Back Butter? Yea...that makes sense....it means we can see the chalk line and have better control over the levelness.

What size grout line should we be using?
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Old 01-30-2014, 08:53 PM   #7
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Tile Size - 20" vs 13"?


Reply removed by author because an ad I did not authorize was inserted within my post.

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Old 01-31-2014, 12:40 AM   #8
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Tile Size - 20" vs 13"?


Here is the area in question....the concrete slab.

I think the specs need a bit more explanation. I have a hard time with the "1/8" over 10'". I think it should be a multiple of the tile width....i.e., "1/8" x 3x tile width"

In either case....I'm willing to bet I'm ok.....but I'll check back on Sunday after the tile is down.....if I'm in a good mood....it went well....if you don't hear from me.....well....there is always beer.

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Old 01-31-2014, 04:50 AM   #9
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Tile Size - 20" vs 13"?


Dawg--You still need to trowel down the floor---the 'back butter' is just a thin coat applied to the tile with the flat side of the trowel--

Youtube---'back butter buddy'----this is a member that has good videos and a neat gizmo to aid in buttering.
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Old 01-31-2014, 04:20 PM   #10
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Tile Size - 20" vs 13"?


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