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Old 02-27-2019, 09:43 AM   #1
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underlayment for 5" engineered click flooring


I'm building a room in our attic space for my son to use as a bedroom. the house is a colonial with a standup attic. the current floor is the old tongue and groove pine which is still in OK shape, but it is a little uneven. I'm working to flatten it as much as possible. I already own the flooring, it's a well known brand that was on clearance for 75% off, so I couldn't pass it up. Its 3/8 engineered click 5" wide planks of varying length. I won't be able to get the subfloor perfect, I know that, but my question is what type of underlayment might mitigate that. I was thinking 6mm cork, but there are a myriad of underlayment types out there. anyone have experience good or bad with this type of project.


Thanks


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Old 02-27-2019, 02:48 PM   #2
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Re: underlayment for 5" engineered click flooring


IF you have substantial aberrations in the subflooring, no underlayment will help. It needs to be reasonably flat. I use Roberts red with white vermiculite type dots on it. Not too much squish but not a "clacky" feeling either. I laid 5" hand scraped bamboo on it and it is working well, after 5 or 6 years.
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Old 02-27-2019, 03:48 PM   #3
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Re: underlayment for 5" engineered click flooring


Quote:
Originally Posted by chandler48 View Post
...I use Roberts red with white vermiculite type dots on it...
Googling that resulted in a bunch of polka-dot dresses.

I have a similar situation and was wondering what product you're referring to.
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Old 02-27-2019, 05:40 PM   #4
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Re: underlayment for 5" engineered click flooring


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Originally Posted by CaptTom View Post
Googling that resulted in a bunch of polka-dot dresses.

I have a similar situation and was wondering what product you're referring to.
But were they pretty and in your size? Or, your wife's size?

Try this https://www.homedepot.com/p/Roberts-...-105/202299502

I am in the process of installing 5" 9/16" tongue and groove engineered wood flooring throughout my 1st floor. The subfloor is 5/8' OSB. I wanted to stiffen it up some so I was going to put down 5mm Luan and was advised against it by a lot of people. Not to mention the instructions.

The instructions suggested 3/8" plywood at the minimum. So I went with 3/8" CDX. And I glued it down with PL400 floor adhesive. Squeezed the glue around and stapled it down. Waited overnight and started the flooring.

I have done hardwood flooring and I loved doing it. I have tiled floor before and I loved doing it. I have done click lock laminate before and I didn't love it, but it wasn't bad. I am quite close to saying that I hate staple down engineered flooring. It is hard, it warps, it is not too consistent. But it looks damn good when done.

Last edited by ktownskier; 03-10-2020 at 12:35 PM.
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Old 02-27-2019, 06:06 PM   #5
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Re: underlayment for 5" engineered click flooring


#1, CDX should never be used as an underlayment!
It's full of voids in the plys.
#2, Underlayment should never be glued down!
As soon as I hear about someone trying to "convert" an attic into living space all kinds of red flags come up.
Just to name a few:
Getting permits for this?
What size are the floor joist and what's the spans?
Does it have legal egress sized windows?
Do the stairs meet local codes to get up there?
What's the plans for running power up there?
What's the plans for building out the rafters for ventalation and enough room for insulation?
https://www.energystar.gov/index.cfm...sulation_table
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Old 02-27-2019, 06:55 PM   #6
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Re: underlayment for 5" engineered click flooring


OK JoeCaption,

You are the first person who said that you shouldn't glue underlayment down. Why shouldn't you? I have found several sources recommending that you should glue and screw (or nail or staple) down when used as a subfloor.

The same applies for using CDX.

Others have recommended it. The big box stores recommend it. The local lumber yard recommends it. The plywood websites recommend. Flooring websites recommend it. And, last, but most importantly, from the flooring manufacturer: "minimum of 3/8˝CDX plywood when gluing to the subfloor."

Please, Joe, enlighten me.
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Old 02-27-2019, 08:27 PM   #7
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Re: underlayment for 5" engineered click flooring


Joe will have his own answers, but gluing the top layer to the subflooring prevents the independent movement of the two layers. Even your fasteners should miss the joists intentionally.

CDX has voids in it and can affect the top layer of flooring, but if you have already installed it, then the cards are dealt.
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