Rim Joist Repair


Old 02-16-04, 04:37 PM
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Rim Joist Repair

I have a rim joist that has some water damage and a few small areas of rot (which lead to some carpanter ants) due to a previous owner attaching a deck ledge without flashing. The rim joist is still in good enough to brace the ends of joists.

I have added flashing to the ledger to stop water infiltration.

What would be considered an acceptable fix for the rotten areas?

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Old 02-17-04, 06:26 PM
awesomedell's Avatar
Join Date: Mar 2003
Location: USA
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Couldn't say without seeing how extensive the damage is.
Old 02-27-04, 09:11 PM
Join Date: Sep 2003
Posts: 344
A lot depends on your nit-pickiness and the accessibility of the rim joist.

I am picky enough to seriously consider the following IF the access was adequate:

Go under the joists and set blocking/bridging to hold the joists in place.

Get a SawzAll with a 12" rough-in blade and cut off the rim joist nails.

Attach a new rim joist, perhaps using screws and plenty of caulk. Keep your sledge hammers nearby.


Temporarily attach scrap blocking to cover each side of the damaged areas.

Drill a hole in one block of each pair, I can't say if top or bottom is the better location for the hole. Inject Great Stuff foam.

Remove the blocks in a few days.

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