Needing to reinforce the structure of my garage attic to support increased load, I'm trying to figure out what kind of member it needs to be and how big to support the relatively long span with minimal deflection. Since the span needs to be about 20 feet, I'm thinking it has to be a box beam, since that would allow for the use of shorter lumber in its construction.
Wikipedia has an entry for deflection so that this can be calculated, but I need to figure out the modulus of elasticity (E) and the area moment of inertia (I). I'd better do some more studying.
For regular joists, I found a calculator for maximum span as well.
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