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Old 03-24-2018, 11:22 PM   #1
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Plywood underpayment over original wood plank


Iím going to install Mannington vinyl floor snap together panels and Iím starting with a half inch ACX plywood subfloor over the original 1940s wood plank. I have a couple of questions. Do I need to glue the underlayment down? And do I need to switch up the grain between the subfloor and the original floor i.e. running in opposite directions? Thanks in advance for your answers and input


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Old 03-25-2018, 01:27 AM   #2
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Ok..
A little more info. It's AC plywood not ACX and it's in a kitchen and dining room.
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Old 03-25-2018, 06:39 AM   #3
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Re: Plywood underpayment over original wood plank


Good plan. Don't glue the second layer, and install your fasteners intentionally missing the joist system. I would first secure the planks to the joists to prevent movement and possible squeaks later on. You still run the grain of the plywood across the joist system, perpendicular to the joists.
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Old 03-25-2018, 08:45 AM   #4
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Ok.. that leads to two questions I was planning on running across the grain of the original planks but that would be with the floor joists. So wondering what the reasoning is there? And I have seen several posts here and elsewhere saying to avoid the joists when screwing down. Why is this?

E..
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Old 03-25-2018, 08:51 AM   #5
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Re: Plywood underpayment over original wood plank


Don't worry about the old subflooring. You want your second layer to go across the joists, with the grain of the planks.

Even though it is minimal all things move. If you stiffen the two layers of subflooring by attaching them both to the joists, you prevent this natural movement. That is why no glue, also. Let things move and you'll have less squeaks, too.
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Old 03-25-2018, 10:39 AM   #6
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Re: Plywood underpayment over original wood plank


Ok I understand. Thank you!
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Old 03-26-2018, 07:13 AM   #7
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Ok one more question popped up. When I get the new underlayment down (19/32 a.c. external) should I take the extra step and seal it? It is in the kitchen and the snap vinyl is listed as water resistant not waterproof.


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Old 03-26-2018, 03:58 PM   #8
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Re: Plywood underpayment over original wood plank


You can, but I don't know what you have in mind for a sealer. What is "external"?
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Old 03-26-2018, 08:39 PM   #9
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My bad exterior...Lol no idea what I would use as a sealer. Just thought about some floor sealer from the local box store
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Old 03-27-2018, 04:34 AM   #10
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Re: Plywood underpayment over original wood plank


Don't use pressure treated plywood on the interior of a house, if that is what you mean by "exterior".
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Old 03-27-2018, 04:36 AM   #11
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Not at all. It just says exterior. Anyway I'm thinking of something like redguard
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Old 03-27-2018, 05:22 AM   #12
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Re: Plywood underpayment over original wood plank


$54 a gallon , think Zinsser Bin Primer oil base.
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Old 03-27-2018, 08:03 AM   #13
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Re: Plywood underpayment over original wood plank


Quote:
Originally Posted by Eric99223 View Post
Ok.. that leads to two questions I was planning on running across the grain of the original planks but that would be with the floor joists. So wondering what the reasoning is there? And I have seen several posts here and elsewhere saying to avoid the joists when screwing down. Why is this?

E..
All wood contracts and expands. If you glue it down or fasten it to the joists, it may split when it expands or contracts. That could lead to a lot of problems.
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Old 04-02-2018, 08:18 PM   #14
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Re: Plywood underpayment over original wood plank


if the wood floor under the ply is solid the you can screw to that make sre the screws are at least 1 inch longer then the ply I put them about every 6 inches and ply really doesn't have a grain . Have done quit afew and have never had a problem
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