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Do you have a rough sketch or plan sheet you can share with me? I want to make sure I have your configuration correct.
The Chat Window has a button on it that allows you to attach files.
I did not give you an answer yet? This is a Chat process where we Chat back and forth until I get the information I need to work out your answer, then once I do, you ask any questions you might have and then when you are happy with your answer, you accept it.
If you do not have any sketches, I will need to ask a few questions:
1. What city and state do you live in for possible snow load.
2. Are you looking for conventional lumber or engineered lumber rafters?
3. Is this for a residential occupancy or commercial occupancy?
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I’d like to point out that a Professional Engineer’s standard of care typically includes a site visit to assess field conditions and get an overall understanding of the structure. This can obviously not be accomplished through the internet. The information provided here is meant for planning purposes only (general sizing and budgeting) and is based on the information provided by you. All loading cases considered are for vertical loads only, no lateral analysis has been completed. The information should be verified by a professional engineer who can visit the site to ensure that potentially important information has not been overlooked or omitted.
You can use 2"x12" Southern Pine (#2 grade or better) spaced at 12" o.c. for your 20' span roof rafters.
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