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Old 06-29-2017, 03:57 PM   #1
mekman
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Default Installing new hardwoods on plank subfloor

Hello - we've recently purchased a home and have begun renovating. We've decided to replace the engineered floors from a previously added-on room with 2-1/4" white oak unfinished hardwoods.

We removed the engineered hardwoods and discovered a layer of MDF. We then removed the MDF and discovered ~6" plank subfloor. The plank subfloor is in good condition with little/no gaps. The house is on a crawlspace, which has a vapor barrier laid down (but does seem like it can get fairly damp).

The plank subfloor runs diagonally across the room. I've read that you need to install hardwoods perpendicular to the planks, and if that's not possible you need to lay a sheet of plywood over those planks. With these planks running diagonally, does anyone think it would be an issue to lay the new hardwoods straight across (without a new plywood layer), creating a ~45 deg angle from the plank subfloor? FWIW, the joists supporting the plank subfloor do run perpendicular to how we plan to run the new hardwoods.

We'd prefer not to add a layer of plywood so that we can keep this room level with the rest of the house. The current plan (assuming this won't be an issue), is to lay Aquabar underlayment over the plank subfloor and nail down the new white oak hardwoods directly over that.

Any thoughts / comments are appreciated. I'm new to all of this, so if anyone has any additional tips/words of wisdom given what we're planning to do, those are also very much appreciated. Thank you!

I've attached a picture for reference which should help give a better idea.


hardwoods1.jpg  

Last edited by mekman; 06-29-2017 at 04:03 PM.
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Old 06-29-2017, 05:28 PM   #2
DarisMulkin
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Those planks are the subfloor. I have the same in my house built in the 50's. You want to lay the wood perpendicular to the floor JOIST. If you cover the subfloor you want to put down 15lb roofing felt or the like. But I would add a layer of ply down first. My house had hardwood shorts and they squeeked to beat heck. I don't know why as they only had 1 finish nail in each board. I put hardwood back with the plyqwood and no squeeks.

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Old 06-29-2017, 05:41 PM   #3
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We're trying to avoid laying down a layer of plywood so that we can keep this new floor (which will be the new kitchen) even with the rest of the house.

Outside of that, though - it sounds like you're saying it doesn't matter at what angle the new floors sit on top of the plank subfloor, it only matters that the new floors run perpendicular to the joists that support the subfloor. If that's the case, it sounds like we're fine to just lay the hardwoods directly over this plank subfloor (with an underlayment in between).

Any other thoughts/comments? Again like I said I'm new to the flooring game so if it sounds like I may be leaving out any important details or steps, your input is much appreciated!
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Old 06-29-2017, 07:39 PM   #4
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You can't run the new floor in the same direction as the substrate .
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Old 06-29-2017, 09:23 PM   #5
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Quote:
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You can't run the new floor in the same direction as the substrate .
This is a very generic answer and doesn't really address my question.
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Old 06-30-2017, 12:06 AM   #6
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What he is saying is you can't run your wood the same angle as those pine boards are going. they have to cross over the joints in the boards or you may end up with a joint over a joint. Also it would be a very weak floor.

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Old 06-30-2017, 01:44 AM   #7
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What Nick and Daris said, you can run it straight, left to right but not at the 45 degree. angle as the subfloor. Perfect explanation if you know wood lingo.
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Old 06-30-2017, 01:51 PM   #8
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What Nick and Daris said, you can run it straight, left to right but not at the 45 degree. angle as the subfloor. Perfect explanation if you know wood lingo.
Maybe I was unclear in my initial post. We aren't trying to run our hardwoods parallel with that subfloor, we're trying to run them straight, which would mean they're running across those subfloor planks at a ~45 deg angle (I've added arrows in the picture below to reflect this). I was only questioning if this was feasible because I had read that you need to run your hardwoods perpendicular (90 deg angle) to a plank subfloor...but from what I can gather based on these responses, your hardwoods just can't run parallel to the subfloor planks, but if they're at a 45 deg angle (as pictured), this should be okay.

Am I interpreting this right? Again we do not plan to lay any plywood over this plank subfloor, so I want to make sure we're going about this appropriately. Thank you all for your help!
hardwoods with arrows.jpg  
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Old 06-30-2017, 04:32 PM   #9
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Take the plank subfloor out of the picture and think floor Joists. Hardwood is to go perpendicular to the Joist-that is what holds up the subfloor. Reason for perpendicular to the JOISTS is because of the weight issue, It would possibly sag between the Joists if run parallel to the joists.

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Old 07-01-2017, 04:31 AM   #10
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Keep this in mind , installing wood flooring over the subfloor you have now , is subject to do what ever, any kind of movement from any or all of those planks , could in time , pull , push , the new wood floor apart , nails or staples working its way lose, rolling felt paper , over the subfloor , installing flooring creates a moisture barrier for the hard wood floor , ,still not going to help against what the subfloor , does


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