Pulled up subfloor and...

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Old 12-25-17, 04:55 PM
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Question Pulled up subfloor and...

discovered this (see picture). I was expecting to see joists 16 inches apart or some other regular standard joist framing.

House was built in 1971. I haven't been able to find anything like it online. There's nothing wrong with it, but I'm just curious why it would have been done this way? Anyone have any idea?

Thank you and Merry Christmas!
 
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Old 12-25-17, 05:13 PM
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That's just sub floor. You have joist under it. Lift up one of those boards and take a look.

What's supporting those planks? Or are they on the ground?
 
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Old 12-25-17, 05:14 PM
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That's tongue and groove flooring or sub flooring. That tongue and groove runs perpendicular to where I've drawn the approximate floor joist locations.

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Old 12-25-17, 05:30 PM
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Yep, you're right. Between the joists, there is nothing supporting it. Just insulation there. I've got a 3.5 foot crawl space.
 
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Old 12-25-17, 05:33 PM
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Thanks, makes sense.

Is it unusual to see this type of subfloor underneath the subfloor I just yanked? Why would they have put these extra planks in?
 
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Old 12-25-17, 06:14 PM
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The tongue and groove is a very popular sub floor.
The actual wood flooring would be attached to the tongue and groove.
 
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Old 12-26-17, 12:02 AM
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Why would they have put these extra planks in?

My guess is that the original floor was pulled up for some reason, to repair the floor or maybe to move something down into the crawl space.
 
 

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