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Old 02-08-2014, 08:00 PM   #1
builder brett
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Subfloor question

Hello, Im remodeling my first bathroom on my 1969 house. The bathroom is gutted and I'm about to install my new subfloor. My plan is to install 3/4 advantech with 1/2 inch OSB Board to beef up the floor. I will then install Schluter Ditra and finally tile. This should provide a smooth transition from my bedroom to bathroom.

I've know to glue and screw the first layer of plywood to the floor joist. I have read conflicting information on the next layer of plywood. Do I glue the sheets and screw the sheets together? Should I just screw them to each other? What is the recommended way? I'm worried about floor squeaks by just screwing them to each other.

Thanks for your expertise.
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Old 02-08-2014, 09:45 PM   #2
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Hi Brett and welcome,
This article in the JB Forum "Liberry" describes how the second layer is attached at the 1/4 and 3/4 points between the joists. The technique make a big difference in the floor by damping out sinusoidal vibrations in the structure before they get transmitted up to the tile layer.

For example, if you jump on a stiff single layer floor you'll feel high frequency vibrations that resonate for a few seconds. If you do the same thing on a double layer floor with the second layer attached at the 1/4 and 3/4 node points the floor will feel "dead".
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Old 02-08-2014, 09:49 PM   #3
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Quick follow up, did you run the joists size, span and spacing through the Deflecto tool to verify the floor meets the deflection rating for tile?
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Old 06-19-2018, 10:46 AM   #4
Steve C.
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Old Link

Hey...I'm very interested in the guide on attaching the 2nd layer sub floor at the 1/4 and 3/4 points....but the link is no longer valid. Is the guide still available?

Thank you.
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Old 06-19-2018, 06:07 PM   #5
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In our Liberry under Wood Framed Floors, post #11, Steve.
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