I am building a 12'x 20' free standing lean to off the back of the house. I am planning on using 4"x4" posts with a 4"x6" beam across the back and front, with a 4"x6" beam across the sides with 2"x6" for the roof with clear sheeting for roof. My question is- how far apart should my 4"x4" posts be~ I am hoping to have the sides open- with the front and back posts 10" apart. Is this enough support? Thank you, Paul
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