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Old 05-09-2012, 01:08 PM   #1
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Determining floor flex for tile project


I am hoping to replace a linoleum floor with a tile one. However, our house has POST & BEAM construction with 2" x 6" TONGUE & GROOVE subfloor spanning the beams and I am wondering if we may have too much flex in the floor for tile.

The floor SEEMS very solid, but the 2" x 6" tongue & groove car decking subfloor spans 4" x 10" beams (supported by 4" x 6" posts on good concrete foundation) with a 60 inch span between the 4" x 10" beams (face to face). There is currently particle board on top of the car decking, which I understand I'll have to cut out and replace with 3/4" plywood (or thicker???), and I'm planning on using thinset and 1/4" Hardibacker on top of that. Will this be rigid enough? Should I use thicker plywood and/or 1/2" Hardibacker? Will I still have too much flex from the 60" spans? How can I tell?

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Old 05-09-2012, 07:01 PM   #2
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Determining floor flex for tile project


This is almost exactly my situation, except that I'm working with 2x6 TnG over 4x8 on 4'.

How pertinent. :D

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Old 05-10-2012, 06:01 AM   #3
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Determining floor flex for tile project


Might try:
http://www.johnbridge.com/vbulletin/deflecto.pl
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Old 05-10-2012, 04:15 PM   #4
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Determining floor flex for tile project


Quote:
Originally Posted by bob22 View Post

Thanks for sharing that.
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Old 05-10-2012, 07:29 PM   #5
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Determining floor flex for tile project


Quote:
Originally Posted by george779
I am hoping to replace a linoleum floor with a tile one. However, our house has POST & BEAM construction with 2" x 6" TONGUE & GROOVE subfloor spanning the beams and I am wondering if we may have too much flex in the floor for tile.

The floor SEEMS very solid, but the 2" x 6" tongue & groove car decking subfloor spans 4" x 10" beams (supported by 4" x 6" posts on good concrete foundation) with a 60 inch span between the 4" x 10" beams (face to face). There is currently particle board on top of the car decking, which I understand I'll have to cut out and replace with 3/4" plywood (or thicker???), and I'm planning on using thinset and 1/4" Hardibacker on top of that. Will this be rigid enough? Should I use thicker plywood and/or 1/2" Hardibacker? Will I still have too much flex from the 60" spans? How can I tell?
The only thing you can put over your 2x6 T&G is hardwood flooring, tile is a hole nother animal when it comes subfloor strength.
Cement board holds no strength it's just a filler for your tile and a preventative for water damage if tile fails.

When I install tile I use 1" of ply if I have the hight for it but no less then 3/4" if not from joists up.

You might get away with 1/2" if staggered ply correctly.
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