05/23/12 Georgia Amendments- Prescriptive Deck Details Sheet 4 of 22
JOISTS
Joists shall be designed in accordance with the requirements below.
• Joist span is measured between the centerline of bearing at each end of the joist and does not
include the overhangs.
• See FIGURE 2 through FIGURE 4 for joist span types.
• Use TABLE 1 to determine your joist size based on span length and spacing.
• The maximum overhang is equal to one-fourth of the length of the joist span (0.25 x joist span).
• Attach rim joist to end of joists as shown in FIGURE 2 and FIGURE 4.
post
joist hanger
optional overhang
existing house wall
ledger board
rim joist
joist
beam
joist spanoverhang
1
attached rim
joist to ends
of each joist
with (3) #10
x 3" wood
screws or (3)
10d nails
FIGURE 2: JOIST SPAN WITH OVERHANG - DECK ATTACHED AT HOUSE
beam
joist hanger
existing house wall
joist
joist hanger
post
beyond
ledger
board
joist span
FIGURE 3: JOIST SPAN - JOISTS ATTACHED TO SIDE OF BEAM
post
post
rim joist
joist
beam beam
joist spanoptional
optional
overhang
1
overhang
1
existing
house
wall
2x blocking between joists; attach
with (3) 10d toe nails each side
attach rim joist
to ends of each
joist with (3)
#10 x 3" wood
screws or (3)
10d nails
FIGURE 4: JOIST SPAN - FREE-STANDING DECK
2
1
The maximum length of the overhang is equal to one-fourth of the joist span length (0.25 x joist span).
2
For more information on Free-Standing Decks, see Sheet 14.
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