Originally Posted by
Charlie Velasquez
Wouldn't all the force on the interior part of the sisters be going upwards?
I don't know the condition of the interior part of the current joists wrt supporting the actual house structure. If they are affected it may entail temporary support and replacing the entire joists system. As mentioned, a structural engineer should be consulted. It looks to present enough problems that safety should not be compromised to save money. It may cost a lot more in the end.
Typically the "moment" forces from weight on the cantilevered portion would want to raise the joists inside the house, but the more significant weight of the floor above this counteracts.
If the joists within the house are rotted, or headed that way, then you are correct in that the entire system needs to be addressed by a professional qualified in home construction, typically an engineer.
However, the pictures don't really show the condition of the interior joists. They have to be "probed" to determine this in addition to visual appearance.
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