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Old 01-06-2017, 01:18 PM   #1
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Flooring over MDF?


Hi
Iím planning to install some 2 1/2 inch prefinished red oak (tongue in groove) flooring. The room is 16x18; the sub floor is MDF. I thought I remembered reading MDF wasnít a great surface for attaching floors toóit doesnít have the holding power that plywood does. But my carpenter says because itís tongue in groove, as long as I make sure the MDF is screwed down really well to the joists, I donít have to worry about the floor install.

Does this sound right?
thx
tom

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Old 01-06-2017, 01:20 PM   #2
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Re: Flooring over MDF?


Never heard of T&G MDF flooring. Are you sure about this?

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Old 01-06-2017, 01:40 PM   #3
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Re: Flooring over MDF?


Quote:
Originally Posted by tomottoe
Does this sound right?
No it does not, especially for the reason he gave you. Carpenter huh? Ax him what t&g has to do with how well a fastener holds into the sheet?

MDF is not used for flooring, as far as I know, maybe you mean particle board. PT, was used in the '80's etc. by builders who wanted to cut corners, it's junk for floors.

I know of no flooring manufacturer that wants their flooring anywhere close to particle board, no matter as a subfloor or underlayment. A subfloor/underlayment should be either plywood or OSB of the proper grade for the purpose.

When was your house built, where is it?

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Old 01-06-2017, 02:03 PM   #4
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Re: Flooring over MDF?


Hi Jaz
I'm in southern CT. House was built in '67; yes, you're right, particle board is what I meant. Room originally had wall to wall carpet which we've pulled up.
Sounds like I'll need to swap in plywood for subfloor. Thanks for the advice.
tom
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Old 01-06-2017, 02:46 PM   #5
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Re: Flooring over MDF?


Particle board has to go.

*Microphone drop*
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Old 01-06-2017, 04:58 PM   #6
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Re: Flooring over MDF?


I'm going to make a guess, homes I've work on in that time period only had a 1/2" plywood subfloor then they laid 3/4 particle board over it.
Makes 0 since to me, but that's just how it was done long ago.
If it was mine I'd be removing what's there and installing Advantech T & G over it.
Lifetime warranty, no voids, great nail holding power, nothing to delaminate, cheaper.

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