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Rotten OSB behind siding-Window Replacment

We have an old farm house and LOVE it, but it has a new addition built between 2001-2002 that has nothing but problems. The addition has wonderful (seamless) steel siding, however the back wall is huge (2 stories and at least 80-100 feet in length. It will be impossible to take the siding off without damaging it. I know this as we already rebuilt an entryway which we had to tear down to the concrete foundation(differnt type of water damage)We reused the small sections of siding, however they tended to bend very easily and those sections weren't bigger than 10'.

All the seals on all the windows on the back side (east facing) have popped and so we are having them replaced. THE PROBLEM: once the exterior trim was taken off we discovered 1.) The ^%$* builder did not use flashing and 2.) as a result of one the corners (at least) are completly rotted out. The sill looks good, but we can't tell for sure how much of the OSB is rotten (ie what is still behind siding and not visible). How do we fix this (okay at least without having the entire back of the house resided which we really can't afford) Any thoughts would seriously be apprecited.

Timothy Miller
Re: Rotten OSB behind siding-Window Replacment

Howdy call your home owners insurance for a reference to a restoration contractor in yourt area explain you wish not to make any claim just want a referral to a contractor. When estimator out pick his or her brain about how to repair...... The normal repair is to remove siding and then tear out an repair the rott. Wet osb can dry an if it has not delaminated can be left in place.But rott is a goner .

Re: Rotten OSB behind siding-Window Replacment

Find out where the water is getting in and caulk it. And my advice about the sheathing is to just leave it as is... sheathing isn't structural, well it is to the extent that it keeps the framing from racking, but you only need 1-2 bays braced to accomplish that. Then when you're ready to replace the siding in the future take care of the rotted sheathing issue then.

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