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Discussion Starter · #1 · (Edited)
I am having a contractor pour a patio on the rear of my 2-story home, that goes from the rear foundation of my home out 12' , and spans the entire back of the home - 39'6". After the concrete cures, I will build a free-standing cover (I have brick veneer) that is supported by 6X6X8 PT posts on the distant corners. I would like to have only two posts equidistant from each other and the end posts (on both long-sides of the patio - one 8' high, the other 10')). That configuration would create three spans a little over 13' each. I am putting up 2X8 roof rafters (16" O.C.) to go the 12+' distance. Would a double-header 2X10 do the job at both ends of the rafters? I live in the Dallas area, so there is no snow load to consider. I have been looking for a table that takes into consideration doubling up the headers, but I have been unsuccessful. I can go to a 2X12 if necessary, but I want to do it right. I will try to upload a drawing to better illustrate my plan...

I realize my drawing indicates 5 posts across the "front" off the patio, but the same spans cause a post to do right down the middle of an existing window. I'd rather do the front (shorter) header arrangement like the rear and use only 4 posts.
 

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Discussion Starter · #4 ·
The concrete pour has not happened yet. The footers around the outside will be 10" wide and 8-10" deep. The HOA requires it to look like the home, so I am putting up 1/2" plywood, tar paper and 20-yr shingles. I want to get a 3" drop every 12" for adequate slope of the roof. Will doubling up on the header with a double 2X12 add any span length? I am unsure of the dead-load or live-load calculation.
 
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