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rotted exposed outdoor floor joists

Posted by seventhfish (My Page) on
Tue, Apr 8, 14 at 18:52

porch on front of house is held up by floor joists coming from the house(Raised ranch). Several are rotted about an inch or two down. Is it feasible to cut the top inch or two inches off these 2x8 boards,and then put a treated piece of lumber on top? I could then epoxy the new top piece to the rest of each joist,then put new wolmanized wood deck on top? I would also put water seal on existing joists,as they were installed in 1962 and they are not treated. Question: Are the joists still safe? Porch is only 4 feet wide,and 26 feet long, on 16 inch joists. Thanks!!!


Follow-Up Postings:

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RE: rotted exposed outdoor floor joists

Does ANYBODY read this site at all??


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RE: rotted exposed outdoor floor joists

Getting nasty is a good way to get advice..............


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RE: rotted exposed outdoor floor joists

I wasn't trying to be nasty. I was serious. It seems like low traffic.


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RE: rotted exposed outdoor floor joists

This is one of the slower forums.

I don't think gluing PT wood to non-treated wood is a great permanent solution. I'd lean toward something like cutting all the joists off and re-framing the whole porch with a PT structure.

How high is it off the ground? Do you have a photo you can post?


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RE: rotted exposed outdoor floor joists

I have no photo, but it is a narrow porch and is supported by itself, as the joists support the porch deck. There are no beams holding it up.


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RE: rotted exposed outdoor floor joists

I understand the current structure is cantilevered. My thought would be to put a few posts in the ground, a ledger board against the house, and new joists, all out of PT.

Another alternative, if you've got access inside the house below the porch level, would be to sister new joists to the rotting ones, securing them well inside the house.

OTOH, if it's been 50 years, the joists still feel very stable structurally, and you're just dealing with 1-2" of rotted joists that make the porch floor springy, then you could probably extend the life cheaply by sistering PT 2x8s to the exposed portion of the existing joists, after cutting out the rotted portion.


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RE: rotted exposed outdoor floor joists

Just determine what's going to show and what's not. Go with what weedyacres said. It's a choice between patching and R&R.


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RE: rotted exposed outdoor floor joists

If I sister on each side of rotted joists, is there an epoxy, or something I can put between the sisters,and on top of the original joist? Also, is there a membrane,or something I could put over the joist and the sistered 2x8s?


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RE: rotted exposed outdoor floor joists

You don't need to sister on both sides; one side is sufficient. No epoxy needed, just nail or screw them together. You could put a waterproof membrane (like window flashing or something) over top of the joists to prevent future water damage. But keep in mind that PT wood is treated to withstand water and insects, so it shouldn't have the same rotting tendency of the original non-treated wood.


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