How big of header lumber do I need for a 13'-0" SPAN?

Question

How big of header lumber do I need for a 13'-0" SPAN?

Answer 1

Try the american wood council site for beam/header for given length

Answer 2

I would contact the local building inspector for a answer

Answer 3

Concrete about 4" x 6"

Wood 6"x 8"

Answer 4

Depends on the load on the header. 2- 2x10 with a 1/2" plywood spacer between would do