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TABLE 1
If you have a and you have then you and the and they can and the footings"D"
beam"B"that is: posts"C" can only minimum size be spaced a supporting the posts
supporting the span the joist you can maximum of: must be a minimum size
beam spaced: joists: use is: of (WxWxH):
4x8 or (2) 2x8 6'-0" apart 6'-0" 2x6* 24" apart 13"x13"x24" deep or
14" diameter x 24" deep
4x10 or (2) 2x10 8'--6" apart 6' 0" 2x6* 24" apart 15x15"x24" or
17" diameter x 24" deep
4x12 or (2) 2x12 10'-6" apart 6' 0" 2x6* 24" apart 16"x16"x24" or
18" diameter x 24" deep
4x12 11'-9" apart 6'-0" 2x6* 24" apart 18"x18"x24" or
20" diameter x 24" deep
4x8 or (2) 2x8 6'-0" apart 8'-0" 2x6* or 2x8 16" apart or 24" 14x14"x24" or
apart 16" diameter x 24" deep
4x10 or (2) 2x10 8'-0" apart 8'-0" 2x6* or 2x8 16" apart or 24" 16"x16"x24" or
apart 18" diameter x 24" deep
4x12 or (2) 2x12 9'-6" apart 8'-0" 2x6* or 2x8 16" apart or 24" 18"x18"x24" or
apart 20" diameter x 24" deep
4x12 10'-9" apart 8'-0" 2x6* or 2x8 16" apart or 24" 18"x18"x24" or
apart 20" diameter x 24" deep
4x8 or (2) 2x8 5'-6" apart 10'-0" 2x8 or 2x10 16" apart or 24" 14"x14"x24" or
apart 16" diameter x 24" deep
4x10 or 12) 2x10 7'-6" apart 10'-0" 2x8 or 2x10 16" apart or 24" 16"x16"x24" or
apart 18" diameter x 24" deep
4x12 or (2) 2x12 9'-0" apart 10'-0" 2x8 or 2x10 16" apart or 24" 18"x18"x24" or
apart 20" diameter x 24" deep
4x12 10'-3" apart 10'-0" 2x8 or 2x10 16" apart or 24" 20"x20"x24" or
apart 23" diameter x 24" deep
4x6 or (2) 2x8 5'-0" 12'-0" 2x10 or 2x12 16" apart or 24" 14"x14"x24" or
apart 16" diameter x 24" deep
4x8 or (2) 2x10 6'-6" 12'-0" 2x10 or 2x12 16" apart or 24" 16"x16"x24" or
apart 18" diameter x 24" deep
4x12 or (2) 2x12 8'-6" 12'-0" 2x10 or 2x12 16" apart or 24" 18"x18"x24" or
apart 20" diameter x 24" deep
G� . __._.____._,,_� 12'-0" 2xT or 2x12 16" apart or 2d" 2 'x 1Yx24" or ;k,
T ... ._ apart 2 diameter x 24„ dee
4x6 or (2) 2x8 4'-6" 16'-0" 2x12 16" apart 15"x15"x24" or
17" diameter x 24" deep
4x8 or (2) 2x10 6`-0" 16"-0" 2X12 16" apart 18"x18"x24" or
20" diameter x 24" deep
4x10 or (2) 2x12 7"-6" 16'-0" 2X12 16" apart 20"x20"x24" or
23" diameter x 24" deep
4x12 9'-0" 16'-0" 2x12 16" apart 22"x22"x24" or
25" diameter x 24" deep
2x6 joists cannot be used where a guardrail is required.
6 • DECK DESIGN GUIDE