Wondering if I need a permit to replace an old existing subfloor with new tongue and groove flooring the joists are 24 inch OC and still in good shape I'm wondering if I need a permit to re sheet with two layers of 19/32 subfloor and then underneath on crawl space put a 4x4 post under each joist one on each end of the room to help bear weight! Not replacing it sistering any joist just new subfloor and help with additional support
As far as I'm aware you do not need a building permit for what you have just described you are only upgrading existing you are not moving or adding walls or floors you're just sistering in which is fine and flooring is called finish so there's no permits for finished flooring Etc
Yes you need a permit and consult an engineer if you are doing any type of work that pertains to structure integrity.
I didn't think I did, otherwise your saying I can lay a subfloor on an existing 24oc joist knowing it will hold but just for extra precaution I brace each joist with 2 4x4 post one on each end of the span, your saying I need a permit for that? But if I just put new subfloor down and left the joist the way they are then I don't need a permit how does that makes sense
It's arguable whether or not you require a permit and it depends somewhat on your municipality. Some municipalities require a permit whenever you're modifying structure in any way.
It's unclear from your description why you're wanting to provide additional support to the ends of the joists.
The Code & permit regulations allow for certain minor projects without a permit however the work still needs to fully comply with Code.
As an example: you will need to make sure those additional posts have suitable bearing top and bottom and that the ends are protected so as not to be in direct contact with concrete below grade and also suitably fastened top and bottom.
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