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Old 11-10-2013, 08:29 PM   #1
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Subfloor installation for tile floor


After installing 1/2" plywood, should I install a layer of felt paper or construction adhesive before attaching the 3/4" upper layer of the subfloor? We intend to tile over the subfloor. What are the advantages or disadvantages to each?
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Old 11-11-2013, 05:51 AM   #2
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Sounds like your trying to do this backwards.
It should be at least 3/4" T&G plywood or better yet Advantech subflooring with construction adhesive on top of the joist, nailed ever 6" with 8D ring shanked nails.
The 1/2" underlayment rated plywood that goes over it needs no glue, no vapor barrier.
You make sure the seams do not like up with the seams below, it's nailed between the joist not to the joist.
It needs to be nailed with 8D ring shanks every 4" on the edges and from 6 to 8" in the field.
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Old 11-20-2013, 02:07 PM   #3
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I'm doing something very similar.

Are there any advantages to using screws over 8d ringshank nails to bind the 2 layers of subfloor?
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Old 11-20-2013, 05:11 PM   #4
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pankaek you need to go back and add your own post. To confusing trying to answer two different peoples questions.
The first layer is subfloor the second layer is underlayment.
Screws will take far longer to install, they will leave raised dimples, there going to try and raise the subflooring as there screwed in, cost far more then nails.
I have a stand up screw gun and use it for the subflooring sometimes but never for the underlayment.
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Old 11-20-2013, 09:41 PM   #5
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i always put down 3/4 plywood or goldedge osb first to the joists glued and nailed with hte framing gun. underlay then gets glue and nailed down with 1 -1/2" ring nails
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