I am building an addition to my house can i use 2x8 boards for floor joists or should it be 2x12?

Question

I am building an addition to my house can i use 2x8 boards for floor joists or should it be 2x12?

Answer 1

2x10 should be fine

Answer 2

It depends on the span the boards need to cover. The 2x8 boards should be fine but get a book about building and look up the different spans on a chart. If you need to get a permit I am sure they won't allow you to build something that isn't up to code.