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Old 02-12-2009, 12:18 AM   #16
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Repair Top of Rotted Floor Joist


nightsurfer: cool handle BTW.
If I understand you correctly, 50% of your 11' long joists cantilever outside the house.
It appears that you have a slightly different code requirement for cantilevers than we do here.
We are permitted 1/3 of the joist length to cantilever, so in the case of a 12' joist for example, only 4' could be outside.
Are the existing joists pressure treated or not? Doesn't sound like it.
I must wonder if two are gone, how far behind can the others be?
One other point, do you have an exit of some kind going from inside the house directly to the deck? I would guess you likely do.
We have a requirement here that the surface of any adjoining deck must be a nominal 2" below the inside floor. That means that when we cantilever a small deck, we must use a 2 x 10 joist. The top of the outside portion has 2" cut off the top. Thus leaving you a 2 x 8 outside.
I think if I were you to avoid any future problems, and I think I can see them arising, that I would remove the existing deck and use the proper footings and posts with appropriate beam to carry your new p.t. joists.
A deck up in the air is no place to mess with. You will be much happier when it is done right.

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Old 02-12-2009, 06:30 AM   #17
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Repair Top of Rotted Floor Joist


Quote:
Originally Posted by nightsurfer View Post
To clarify, the cantilevered portion of the 2 x 8 Joists go 11 feet through the exterior wall and into the house. 5 1/2 Feet are on the outside of the exterior wall.
Cheers
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Old 02-12-2009, 05:59 PM   #18
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Repair Top of Rotted Floor Joist


That certainly makes more sense.
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Old 02-27-2009, 12:11 AM   #19
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Repair Top of Rotted Floor Joist


if available where you are, you would be wise to use a couple pieces of "Paralam", one on each side of the rotted joist. they re very light and incredibly strong and rigid. you don't want to add much more weight to the rotted joist, and be sure to lap it onto solid part of joist at least 4" or more, each way from rotted section

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