Resources for building a lean-to porch roof?

[Easy Livin’ 3000]

I'm building a a simple lean-to porch, and need to figure out the specs for sizing and spacing the roof rafters, and the beams that the rafters will sit on, given a specific span. Also, I would like it to have the minimum pitch while using asphalt shingles. Any tips on a good online resource to figure these things out?

The footprint will be 8' x 16".

 

[DAKSY]

Basic Roof Framing Instructions - Carpentry Pro Framer

Basic Roof Framing Instructions The first step in conventional roof framing is to layout and cut a common rafter pattern. The rise and run of the common rafter will determine the height of the ridge board as well as the length of any hip / valley rafters that may be involved with a...

www.carpentry-pro-framer.com

 

[The.Devo]

blocklayer.com