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Old 09-08-2017, 07:24 PM   #1
Govinator3
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Small Entryway substrate question

Hi everybody,
I have a small entry way, joists are 2x6 fir spacing 16 oc and unsupported length is 6' 3". Deflectolator gave me 1/697 with a 6.5' span. Im going to be installing a marble basket weave mosaic 1"x2" pieces.
Current subfloor is 3 1/4" x 3/4" TG pine flooring. Im wondering what my minimum thickness solution will be without ripping up the existing subfloor. I want to just slap nobleseal cis on top the subfloor but im pretty sure thats not gonna fly.

Let me know what you guys think.
Thanks, Mike
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Old 09-08-2017, 07:49 PM   #2
rmckee84
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Minimum I'd go with would be 1/2" ply over what you have. But I'd be more inclined to pull the boards and start fresh.
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Old 09-08-2017, 08:05 PM   #3
Govinator3
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Thanks for the input, in this situation 1/2"ply over 3/4" t&g could i tile directly to the plywood or will i need membrane or 1/4" cbu?
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Old 09-08-2017, 08:21 PM   #4
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Welcome back, Mike.

Your subfloor does not technically qualify for a tile installation directly to the top layer of plywood, but you can tile to whatever you like. I'd recommend you use a CBU or membrane of some type over your subfloor before tiling. The NobleSeal would be a good choice.

My opinion; worth price charged.
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Old 09-09-2017, 05:15 PM   #5
Govinator3
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Thanks CX,
I put my order in for noble cis today, its a bummer that i cant find someone who carries it in stock. I want to make sure i get the screw spacing right. Is 6" on the edge and 8" in the field correct? I assume I want to miss the studs as well? I wont be glueing it down.
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Old 09-09-2017, 07:05 PM   #6
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That would all be correct.

My opinion; worth price charged.
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