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Unread 12-31-2009, 01:58 AM   #1
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introduction... question... whatevs

hey guys, been round here searching for a while but i've been doing more tile jobs lately so i'd like to hang with the pros. my first question is... i was laying 1/4 backer over 3/4 ply in a 160' bathroom thinsetting under the cbu of course. we kept saying "bomb proof" all day. guy i was working with was talking about how it "used" to be done. tile right over ply... and it was fine. can ya'll give me the details on this assembly vs ply...? does this add 5, 10 years to the lifespan?

anyhow. my name is Dave, 24yo builder on the big ilsand of hawaii...
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Unread 12-31-2009, 05:41 AM   #2
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There's specs for it in the TCA handbook.
Add? He said add life?
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Unread 12-31-2009, 08:45 AM   #3
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Welcome, Dave. Or do you go by Dub?

As Royce points out, the requirements for using the direct-to-plywood method are set out in the TCNA Handbook. Pretty specific requirements. Did you axe your friend how he did his subfloor and underlayment back when he tiled directly over plywood?

It's still an industry accepted method when done correctly, but we generally discourage the use of that method entirely for DIYers and almost entirely for pros. There are better ways to set floor tile these days, including the one you were using.

My opinion; worth price charged.

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Unread 01-01-2010, 05:14 AM   #4
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What they said.

And with the high cost of shipping heavy cement board to Hawaii, consider using Ditra instead. A roll that covers 323 sq/ft only weighs 45 pounds. You'll consume more thinset, but I think the savings is worth looking into.
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