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Unread 01-26-2006, 10:53 AM   #1
grisby
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I know--another plywood ???

Have not been on here for a while and I did a search and I even know what I did in the past that works but now I am confused.

I was told by someone (and even found info on another forum)that when you add the 2nd sheet of plywood to an already existing layer that you should lay the plywood perpendicular to the first layer of plywood(not to the joists) which of course would be parallel to the joists and of course the cbu would then be perpendicular to the original layer.

I dont see the purpose in this being that the CBU has no structural strength.

Now I did 2 rooms where I added a 2nd sheet perpendicular to the joists(staggered of course over the first layer) and have no problems. I usually nail the 2nd layer to the joists being that the CBU is not nailed/screwed to the joist just to the 2nd layer for the decoupling effect just to the 2nd layer of ply.

Am I correct in doing it this way--never had a problem in past, or should I do it the "new" way.

Sorry to be so long winded.

bill g
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Unread 01-26-2006, 11:03 AM   #2
Dave Taylor
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Hi Bill.....

Continue with your fine floor prep work in the way that you've already proven to yourself works on your own home :---).
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Unread 01-26-2006, 05:53 PM   #3
jadnashua
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Avoid nailing the second layer to the joists, but other than that, you should be okay. Do a seach here, CX posted a link to a good technical discussion on this.
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Unread 01-26-2006, 06:15 PM   #4
grisby
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Thanks guys.
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Unread 01-26-2006, 07:37 PM   #5
Jaz
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Bill,

I think you have done it perfectly the way it should be done. The underlayment should also run across the joists but staggered both ways from the subfloor. In addition, the warning not to fasten the 2nd layer into the joists is not really accurate. The original thought was not to fasten into the joists IF this 2nd layer of plywood is the actual surface the tiles are bonded onto. Same for the backerboard. I've noticed some have changed it's intent the last few years, which doesn't really hurt anything though.

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Unread 01-27-2006, 05:54 AM   #6
grisby
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Thanks Jaz, thats what I figured. The CBU is actually the decoupler, its just that I get dangerous when I read, plus the fact I am doing an area bigger than I usually do(remodlelling my house again)
thanks
bill g
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