can i build a 10x16 shed with a 4x16 porch with overhang supported by 1 4x4 beam? i'll use 3 4x4 posts positioned at the corners and center meaning a span of less than 8' between posts. the overhang is 2x4 16"oc, using 1/2" osb sheathing and asphalt shingles. will this roof sag? and what extra support can i add to prevent it from happening? thanks.
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