How to repair subfloor rot

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Old 12-30-17, 08:58 AM
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How to repair subfloor rot

Hello,

My hardwood floor have sustained some water damage this year, now that its all dried up it looks like the subfloor is rotting - please refer to the picture. The rot hasnt spread very far as of yet.

Can anyone tell if this is wet or dry rot?

What is my best course of action here? I want to salvage this subfloor.

Thank you very much!
 
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Old 12-30-17, 09:03 AM
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Poke it with a screwdriver... if it's still fairly solid, it's no big deal. If it's a little soft in a small area directly above the joist, you could sister a couple short pieces of wood to each side of the joist to add support where the plywood is more solid. No big deal.

Things rot because they are or were wet, not because they are dry so there is really no such thing as dry rot.

The discoloration is just a stain.

Only way to replace it is to tear up your hardwood floor... even if there is a few inches of rot, i doubt it is worth all that.
 
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Old 12-30-17, 09:36 AM
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Thank you very much for your reply.

Is there any fungus i should be worried about and try and spray it with fungicide to avoid any spread?
 
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Old 12-30-17, 09:42 AM
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There is no visible staining on your floor joists. I would just monitor and move on to the next project. I've seen far worse and yours looks to be very minor.
 
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Old 12-30-17, 09:53 AM
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Doesn't matter. Fungus does not grow unless it's wet.
 
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Old 12-30-17, 10:34 AM
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Thanks again guys, much appreciate your help!
 
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Old 12-30-17, 05:00 PM
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I have to totally disagree, there's a reason that the sub floor is stained like that.
It most likely was caused from something outside that's going on.
Post some pictures of the outside in that area.
A deck attached to the side of the house with improper flashing, siding to close to grade, no gutters Ect.
 
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Old 12-30-17, 05:06 PM
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I would assume they know what caused the water damage and that that problem has been solved.
 
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Old 12-30-17, 07:14 PM
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Yes, this looks like water seeped through the joint where two subfloor panels met and did some wicking into the plywood. It will dry out in time and the stain is not structural. Lack of any staining on the joist says it was a one time event and there is nothing to worry bout.
 
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Old 01-05-18, 06:37 PM
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yes, it was a problem outside that was causing the issue but it was resolved. There is a door to the outside right above this that had a sill that was leaking. but we solved that issue. Thanks again!
 
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