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My deck and patio door were improperly flashed. I've discovered that the osb sheathing between the ledger and the rim joist is rotten. Assuming the rim joist is still sound (I've not yet confirmed this to be the case), it's it all right to have a space between the ledger and the rim joist? Does that put to much tension on the upper ledger boards? Should I drive home sort of plywood spacers to fill some of the space the sheathing used to occupy?

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