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Hello. I can help
Southern pine? grade no. 2?
Great. Assuming a 10 psf DL, the floor is good for a 40 psf LL.
There is no table, but I can develop one for you as a premium service.
I will submit an offer for you to consider. I will include 2x4 southern pine no. 2 with spacings 12", 16", and 24" and spans of 4', 5', 6', 7', and 8'