Backerboard over 2x6 decking?

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Old 06-08-08, 03:58 PM
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Backerboard over 2x6 decking?

I have layed a fair amount of tile but am not sure if this is an accepted method. My main problem here is matching the current carpet elevation.

The floor is post and beam construction. What I see when I lift the register in the floor 2x6 tounge and groove decking, with 1/2" particle board over that, then carpet.

My questions is, can I remove the 1/2" particle board, and mortar hardibacker right on the 2x6 decking?

Or do I need to have plywood between the decking and hardibacker?


Thanks in advance.
 
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Old 06-08-08, 04:32 PM
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westnlas

I think you could put the backer board on the 2x6 without a problem. The backer board should absorb any flex the 2x6 sub-flooring may have.
 
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Old 06-08-08, 07:01 PM
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WRONG!!

All CBU manufacturers tell us not to install their board over any type of planks, you will need to install a plywood underlayment first. With 2x6" subfloor you should use min. 1/2" b/c plywood.

Now in this case because of post and beam, it is not recommended that tiles be used at all. Mainly because your joists spacing is probably 4'. You can consult with pros that have experience in this method in your area, however I know of no written spec for this type of installation.

Jaz
 
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Old 06-09-08, 01:48 PM
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Thank you for the quick replies... Any other thoughts out there
 
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Old 06-09-08, 02:26 PM
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JazzMan is correct.

You CAN NOT apply cement backerboard directly over 2X6. You will have nothing but problems. Cement board WILL NOT absorb any flex, that's rediculous. In fact, you can't have any flex at all or the installation will certainly fail.
 
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Old 06-09-08, 02:52 PM
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JazzMan is correct.
Yes he is.

The dimensional lumber has way to much movement in it for a tile installation. You need at least 1/2" of plywood over the 2x6's as has been mentioned by jazman. Also you will have other issues with the post and beam construction.
 
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Old 06-09-08, 05:08 PM
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Also you will have other issues with the post and beam construction.

Will these problems be solved by the 1/2" plywood. I will have transition issues to deal with if I need 1/2" plywood, and still 1/4" backerboard. I would suppose it wouldn't be adviseable to set the tile diretcly to the 1/2" plywood with no backer?
 
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Old 06-09-08, 05:15 PM
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Will these problems be solved by the 1/2" plywood.
As Jazman indicated you likely have 4' spacing between joists. You'll need to do something to fill that in too something more acceptable.

After you have resolved your floor framing issues, if you cant go with the cement board for height issues consider using an isolation membrane. The added height will be 1/8" or less depending on which one you choose.
 
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