Water damage to subfloor.

Submitted by CaptainPotato-Head t3_10k8e5p in DIY

I am replacing the old 1970’s carpet with LVP flooring and when I ripped up the old carpet I found 3/4” particle board underlay with water damage under the window. After removing the underlay I found the same damage to the subfloor. The water damage was caused by a leaking window which was replaced long before I bought the house. The wood has been dry, but some damage has been done. I cut out as much subfloor as I could and replaced with approved OSB, but there’s still some damaged wood in the areas I couldn’t get to. Any advice?

https://imgur.com/a/5UqtU9o

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Hasz t1_j5pwp29 wrote

Cut out all the damaged subfloor, add blocking if needed, and bring the new floor up to match existing floor. I would glue down the new ply to the joists. For LVP, consider flattening out any inevitable height differences with planing/sanding, and fill gaps or divots with floor patch.

If there’s water damage under the sole plate, you might be able to remove it and replace, but as this is an exterior wall, it will be a PITA. Just add blocking and tie the new subfloor in there.

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CaptainPotato-Head OP t1_j5rcclx wrote

Thank you.

I have cut out the damaged subfloor (as close to the wall as my saw would allow), added blocking where needed, the floor height matches perfectly. I didn’t glue down, but I used screws every 4” down joists. My next step is to lay thin set before the new 1/4” underlay.

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Still_Willow2252 t1_j5p83ys wrote

Might be better to post some photos so others can see the damage

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