2nd October 2019

deckmagazine
18

How far can a deck be cantilevered?

A southern pine (2) 2x12 beam can span 8 feet when supporting joists spanning a maximum of 14 feet, and it can cantilever 2 feet beyond the posts on each side. With the allowable cantilever of the joists, this beam would support a deck 12 feet by 17 1/2 feet.

What size header is needed for a 6 foot span?

Figure B: Example of Calculating Header Size
Header SizeMaximum SpanNumber of Trimmers
Double 2×64 ft., 0 in.One
Double 2×85 ft., 0 in.Two
Double 2×106 ft., 2 in.Two
Double 2×127 ft., 1 in.Two
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