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Unread 01-18-2007, 09:28 AM   #1
satyr64
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Join Date: Jan 2007
Location: Broward , FL
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subfloor for tile

I am going to tile my foyer, kitchen, and laundry room (about 750sqft) in my newly built house (1 month old). The current flooring is ¾ OSB glued and nailed to 2x10 or 2x12 at 16 oc. ( Will check later which one it is). On top of that is a thin luan wood and vinyl flooring.
What underlayment and cement should I use to support 18in ceramic tile?
Should I rip up the luan and vinyl or add on top?
I will mostlikely be buying the products and the homedepot or lowes.

Thanks a bunch
Jason
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Unread 01-18-2007, 09:44 AM   #2
John Bridge
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Hi Jason, Welcome aboard.

I would remove the vinyl and luan, and replace it with 3/8 plywood and Schluter Ditra membrane.

http://www.schluter.com

Also, check the unsupported length of your joists and check them against our Deflotolator (link above).
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Unread 01-18-2007, 09:56 AM   #3
Trask
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Jason,

You should find out how far those floor joists span too.( so we know we're ok for deflection.) Yes I would rip up the luan and add a layer of ply or OSB..3/8" min. then start with the tile specific substraight...wonderboard, ditra ect.


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Unread 01-18-2007, 10:57 AM   #4
satyr64
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Thanks for the quick response.

My longest span on the 2x10 joist is 14 feet and then it rest on a steel beam and another 14 feet, so the length I am using 14 ft and my deflection calculated is 0.442 inches. So I guess I should be good for ceramic tile.

My plan sound like I will rip out the vinyl and luan and screw down 3/4 plywood. tile specific substraight on top and then tile.

Should I keep a 1/4 space from walls and cabinets with the plywood for expansion? Also with the ditra I watched the video on their site, do I have to use the wall pieces if I am not planing on tile a baseboard?

I found out the cost of ditra, seems to be a lot, what is it lower cost alternative or is ditra worth the extra cost?

jason

Last edited by satyr64; 01-18-2007 at 12:33 PM.
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