Sub floor thickness for new hard wood floor


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Old 06-26-17, 07:15 AM
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Sub floor thickness for new hard wood floor

Hi everyone,

I have ripped out old oak hard wood flooring with an intent to replace it with new hard wood. My house is 1960s, so the original sub floor is made of 5 inch wide and around 3/4 of an inch thick planks installed on 45% (picture attached). I would like to flatten and reinforce the floor prior to laying new 3/4" hard wood, as in some areas the floor joist have warped or sagged. I also have a basement apartment, so I would like to add an extra layer in order to reduce sound transference. I spoke to some flooring guys at HD and some opinions were as follows:
1) 1/2 plywood is sufficient
2) 5/8 tounge and groove
3) One guy said that the plywood needs to be 3/4 " to really provide that stable and levelled base.

The price difference is about 6$ between each thickness and I am talking around 950 square feet of flooring.

Advice would be greatly appreciated.

Thanks.
 
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Old 06-26-17, 08:43 AM
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Minimum standards for nail holding power are as follows:

5/8" plywood
3/4" OSB or Advantech

They can be found in this publication by the National Wood Flooring Association

http://tinytimbers.com/pdf/nwfa-install-guidelines.pdf
 
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Old 06-26-17, 08:46 AM
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Thank you for replying. But I see that OSB doesnt hold nails well in terms of nailing hardwood to an OSB board? As far as the price goes, OSB would definitely be a much cheaper option.
 
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Old 06-26-17, 03:51 PM
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That is why the required thickness is greater than plywood. Advantech (big blue stores) or Home Advantage (same stuff at big orange stores) are top of the line OSB brands that you should consider.
 
 

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