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Old 06-04-2008, 12:51 PM   #1
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Thinset under concrete backer board?


Hello All,

I'm going to be installing tile on my kitchen floor which right now has plywood. I'm going to be installing a 1/4" backer board over the plywood so I can tile. My question is should I set it with thinset and screws or is screwing it in enough? All suggestions and opinions would be appreciated.

Thanks,
Dank

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Old 06-04-2008, 01:24 PM   #2
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Thinset under concrete backer board?


Suggestions and opinios don't count. READ THE INSTRUCTIONS!

ALL backerboard makers want their product set into a fresh bed of thinset, in some cases unmodified thinset.

ALWAYS FOLLOW THE MANUFACTURERS SPECIFICATIONS!

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Old 06-04-2008, 03:43 PM   #3
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Thinset under concrete backer board?


TCNA handbook is a good idea too, if you have never read one! Lots of sound info.
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Old 06-04-2008, 07:08 PM   #4
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Thinset under concrete backer board?


What Bud said. Use the thinset.
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Old 06-05-2008, 11:25 AM   #5
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Thinset under concrete backer board?


I Used To Lay Tile And When Ever We Used Cement Board We Always Put Ir Down With Thinset And A Nail Gun
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Old 06-05-2008, 02:37 PM   #6
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Thinset under concrete backer board?


Also mud and tape the seams with fiberglass mesh tape and thinset.
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Old 06-05-2008, 02:45 PM   #7
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Thinset under concrete backer board?


Oh Yeah I Forgot About The Tape And The Seams. That Helps To Prevent Cracks Ans Other Things Over The Years
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Old 06-05-2008, 04:27 PM   #8
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Thinset under concrete backer board?


Just so to not confuse others, we do NOT "mud" and tape any seams with any CBU. The proper term for the product used is "thinset". Mud is something completely different in the tile business.

I only bring this up because there are many hacks out there that use the term "Mud" when they only spread thinset to set tiles. They are trying to deceive others to make them think they are actually doing a "real mud job" when they are not.

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Old 06-05-2008, 05:04 PM   #9
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Thinset under concrete backer board?


Since this has gotten technical.....
Make sure you use an alkaline resistant tape over the backer seams. Also, make sure you stagger the seams for each row. You then use thinset over the tape and screw/nail holes.

I think between all 6 of us, we covered everything now!
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Old 06-05-2008, 05:23 PM   #10
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Alkali resistant alloy screws or nails.
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Old 06-05-2008, 05:45 PM   #11
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Thinset under concrete backer board?


Geez,

After all of this I hope Dank even reads this
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Old 06-05-2008, 06:21 PM   #12
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Thinset under concrete backer board?


Hey....installing tiles correctly can be technical

I'm sure it doesn't hurt, but thinset over the fasteners is neither necessary nor recommended.

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Old 06-05-2008, 06:57 PM   #13
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Thinset under concrete backer board?


Quote:
Originally Posted by JazMan View Post
thinset over the fasteners is neither necessary nor recommended.
Jaz
OK, but as a precaution. What if a fastener blasts through the bottom of the CBU or if you get too close to the edge and crack the CBU?
Besides, doing that helps keep dust and debris out of the counter-sunk screw holes. I hate dusty CBU when trying to thinset!

So point taken but I don't see how it can hurt.
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Old 06-06-2008, 03:22 PM   #14
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Thinset under concrete backer board?


Yes Thinset Is Used. Oh I;m So Sorry The Word Mud Came Up Thinset All The Way.

Thinset/mud Most People Know What Ya Mean
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Old 06-06-2008, 03:27 PM   #15
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Thinset under concrete backer board?


Javaman-- keep in mind-- this is a DIY forum. Everyone who comes in here WON'T necessarily know what's meant.

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