OSB Underlayment for engineered hardwood insallation


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Old 09-28-20, 10:12 AM
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OSB Underlayment for engineered hardwood insallation

I searched the forums for using OSB as an underlayment but I think what I'm finding is OSB as a subfloor and I don't think it's the same situation. I'm looking to install engineered hardwood and the subfloor is a plank subfloor, the old hardwood was attached right to the planks but I need to raise the new hardwood to be level with the ceramic tile that was just installed.

The question is, can I use OSB on top of the plank floor to install the hardwood, or do I need to use plywood as an underlayment. It would need to be a 5/8th inch thick piece of OSB, and I'm assuming the installer will nail through the hardwood, through the OSB and into the plank subfloor? The picture shows what the OSB would be going on top of, the planks 3/4 inch thick


 
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Old 09-28-20, 10:54 AM
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Yes, OSB is suitable as a subflooring layer underneath wood flooring. If you can find it the tongue and grooved style OSB would be a good choice but you can also use the square edged as it's more commonly available.
 
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Old 09-28-20, 04:25 PM
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Thanks, that's good news. I need about 20 sheets and $15 less a board up where I am.
 
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Old 10-05-20, 06:10 AM
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Follow-up question. I'm beginning the installation of the OSB subfloor and the rules are screw every 4 inches on the ends and 6 inches in the middle. Is this overkill for HW floor installation? There are going to be a ton of nails hammered into the hardwood flooring and must help when it comes to subfloor being attached.
 
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Old 10-05-20, 09:26 AM
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That's more screws than I've used but I'm a painter not a carpenter.
Flooring nails go in at an angle and for the most part are just into the sub floor. They do very little if anything to secure the sub floor to the joists or underlying planks..
 
 

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