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Replace rotting OSB: whole board or rotted portion?

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Posted by: from Coquitlam
7/13/2016 at 1:18:41 AM

Some of our OSB board walls (unfinished/non-insulated) in our garage have some mold/rot at the bottom due to some previous water ingress. Are we best to cut out the mold/rot portion (approx 18" high) or are we better to replace the entire 4x8 boards?

The challenge is to access anything higher than 18" from the outside involves removing 28 year old vinyl siding, that may crack and break, opening up a bigger can of worms (and cost). But we want it done right and for the long-term.

Also of note, we had a carpenter ant issue nearby that was treated professionally, but they don't appear to have eaten the OSB itself. We are unsure where the nest was.

Thanks,

Rob

Replace rotting OSB: whole board or rotted portion?
Replace rotting OSB: whole board or rotted portion?
Replace rotting OSB: whole board or rotted portion?
Replace rotting OSB: whole board or rotted portion?
Replace rotting OSB: whole board or rotted portion?
REPLIES (2)
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Date/Time7/13/2016 at 7:27:12 PM

Hi Rob,

Replacing 18 inch of board is fine. Make sure that if there is house wrap on the outside you replace that as well. If you are going to cut yourself use a battery power skill saw. The are light weight. Adjust the blade width accordingly so you don't cut the studs.

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Rob in Coquitlam
Date/Time7/13/2016 at 8:49:23 PM

Thanks Lorne. I appreciate the quick reply.

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