Adding underlayment for ceramic tile install

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Old 12-25-08, 07:27 AM
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Adding underlayment for ceramic tile install

I currently have a subfloor of 19/32 on 16 inch OC 2x10 joists. I want to install a tile floor and need to increase the hight of the floor a little. I was thinking of adding another 19/32 and a 1/4 inch Hardiebacker. Does that sound reasonable? I assume I need to glue and nail the new plywood to the old.

Thanks.
 
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Old 12-25-08, 08:00 AM
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Sounds good. It's always good to have additional subflooring. Just make sure you lay the plywood opposite of the current ply. Screw into the existing subfloor, but try not to screw into the joists with the second layer. No adhesive required.

They also have 1/2" hardibacker if you need additional height. The backerboard gets laid in a bed of thinset and screwed down.
 
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Old 12-25-08, 08:22 AM
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Are you saying I should lay the new plywood perpendicular to the way the old plywood is laid or do you mean just to stagger the joints?
 
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Old 12-25-08, 09:23 AM
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Yes, stagger the seams....................
 
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Old 12-26-08, 08:16 AM
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Originally Posted by HotinOKC View Post
Just make sure you lay the plywood opposite of the current ply.



screw into the existing subfloor, but try not to screw into the joists with the second layer.
Mark

to me, this implies to turn the seems 90deg of the first layer.
is this what your saying ?

and why not screw into the joists ? i would think this is the thing to do.
 
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Old 12-26-08, 10:18 AM
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Take a look at this:

http://www.tile-assn.com/tileletter/...oeste-0604.pdf

It's a good article.

It has been talked about that screwing the second layer into the first layer only limits the amount of movement being transfered from the joists.
 
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