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Old 01-25-2010, 01:40 PM   #1
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Subfloor Question


Hi all ... working on a putting a hardwood floor in our kitchen. Currently in the kitchen, there is a linoleum, the 1/4 luan plywood, then 1/2 MDF, then 1/4 luan, and then the joists.

My question is, how would you attack the subfloor on this job? My initial thought would be to take the laminate and the 1/4 luan up and nail to the MDF. But i have others tell me to take the sub floor up all the way to the first luan plywood and lay a new new subfloor ... im confused....

Also, do i need to put something between the subfloor and the hardwood?

thanks for your help .... sorry for the life story ....

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Old 01-25-2010, 02:55 PM   #2
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OK, I'm confised. Are you saying that this stuff is on top of your subfloor? Or are you saying that the two layers of Luaun and MDF are your subfloor?

I am not a professional, but I wouldn't put anything over MDF. It's not as bad as particle board, but it's still more susceptible to water damage than a quality plywood. And now is a good time to get the weak links removed.

If it were me fixing up my home, I'd tear down to sub-floor and go from there. If this stuff is your subfloor, I'd seriously consider installing a proper plywood subfloor.

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Old 01-25-2010, 03:09 PM   #3
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Ok, so in our house, we have a basement. In the kitchen, above the joists, i have 1/4 luan, 1/2 mdf, 1/4 luan then linoleum. So I would say that the subfloor is 1/4 luan, then there is the 1/2 mdf and another sheet of 1/4 in luan and then the linoleum ... that should be about as clear as mud. Thanks for the help, I was assuming that was what i needed to do
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Old 01-25-2010, 03:14 PM   #4
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Originally Posted by debo View Post
Ok, so in our house, we have a basement. In the kitchen, above the joists, i have 1/4 luan, 1/2 mdf, 1/4 luan then linoleum. So I would say that the subfloor is 1/4 luan, then there is the 1/2 mdf and another sheet of 1/4 in luan and then the linoleum ... that should be about as clear as mud. Thanks for the help, I was assuming that was what i needed to do
Are you sure the first layer of subfloor (next to the joists) is only 1/4"?
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Old 01-25-2010, 03:17 PM   #5
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Yes, I was able to look in a cold air return. It was also like this in our bathroom and I can only assume the rest of the house ....
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Old 01-25-2010, 03:29 PM   #6
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Wow I'd remove it all and install a proper 3/4" plywood t&g sub floor.
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Old 01-25-2010, 03:32 PM   #7
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If your description and terminology is correct--I would remove the flooring and get down to the joists .

3/4 plywood subfloor--that's the ticket--

I've never heard of a flooring system like you have described--1/4 inch luan over the joists------
Then medium density fiber board?? that mdf has no structural strength--Did you mean OSB(oriented strand board)?

Sounds like the job was done wrong long ago. Time to fix it right.--Have fun--MIKE--
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Old 01-25-2010, 04:16 PM   #8
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That floor would have to violate code.

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