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06-04-2008, 01:51 PM
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#1
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Member
Join Date: Mar 2008
Posts: 42
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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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06-04-2008, 02:24 PM
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#2
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Tileguy
Join Date: Mar 2006
Posts: 9,104
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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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06-04-2008, 04:43 PM
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#3
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Not-So-Newbie
Join Date: Aug 2007
Location: Missouri
Posts: 52
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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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06-04-2008, 08:08 PM
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#4
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Tile Contractor
Join Date: Feb 2008
Location: Bridgton, Maine
Posts: 108
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Thinset under concrete backer board?
What Bud said. Use the thinset.
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06-05-2008, 12:25 PM
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#5
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Member
Join Date: Sep 2007
Posts: 60
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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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06-05-2008, 03:37 PM
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#6
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Moderator
Join Date: Apr 2008
Posts: 6,520
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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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06-05-2008, 03:45 PM
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#7
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Member
Join Date: Sep 2007
Posts: 60
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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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06-05-2008, 05:27 PM
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#8
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Tileguy
Join Date: Feb 2007
Location: Troy, Michigan
Posts: 3,264
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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. 
Jaz
__________________
Tile 4 You LLC Troy, MI
KERDI Shower Specialist ... DITRA Installs ... Product-Method suitability consultation. I have NEVER made a mistake, I thought I did once...........but I was wrong! - PRODUCTS ADVERTISED WITHIN MY POST ARE NOT ENDORSED BY ME!
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06-05-2008, 06:04 PM
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#9
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K&B Remodeler/Tile Guy
Join Date: Apr 2008
Location: Illinois
Posts: 887
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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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Angus
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06-05-2008, 06:23 PM
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#10
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Tile Contractor
Join Date: Feb 2008
Location: Bridgton, Maine
Posts: 108
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Thinset under concrete backer board?
Alkali resistant alloy screws or nails. 
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06-05-2008, 06:45 PM
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#11
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K&B Remodeler/Tile Guy
Join Date: Apr 2008
Location: Illinois
Posts: 887
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Thinset under concrete backer board?
Geez,
After all of this I hope Dank even reads this 
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Angus
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06-05-2008, 07:21 PM
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#12
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Tileguy
Join Date: Feb 2007
Location: Troy, Michigan
Posts: 3,264
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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. 
Jaz
__________________
Tile 4 You LLC Troy, MI
KERDI Shower Specialist ... DITRA Installs ... Product-Method suitability consultation. I have NEVER made a mistake, I thought I did once...........but I was wrong! - PRODUCTS ADVERTISED WITHIN MY POST ARE NOT ENDORSED BY ME!
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06-05-2008, 07:57 PM
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#13
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K&B Remodeler/Tile Guy
Join Date: Apr 2008
Location: Illinois
Posts: 887
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Thinset under concrete backer board?
Quote:
Originally Posted by JazMan
thinset over the fasteners is neither necessary nor recommended.
Jaz
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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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Angus
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06-06-2008, 04:22 PM
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#14
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Member
Join Date: Sep 2007
Posts: 60
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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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06-06-2008, 04:27 PM
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#15
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Tile Contractor
Join Date: Feb 2008
Location: Bridgton, Maine
Posts: 108
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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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