ICC Subscriptions
 
R502.2.2.1 Deck ledger connection to band joist. For decks supporting a total design load of 50 pounds per square foot (2394 Pa) [40 pounds per square foot (1915 Pa) live load plus 10 pounds per square foot (479 Pa) dead load], the connection between a deck ledger of pressure-preservative-treated Southern Pine, incised pressure-preservative-treated Hem-Fir or approved decay-resistant species, and a 2-inch (51 mm) nominal lumber band joist bearing on a sill plate or wall plate shall be constructed with 1/2-inch (12.7 m) lag screws or bolts with washers in accordance with Table R502.2.2.1. Lag screws, bolts and washers shall be hot-dipped galvanized or stainless steel.

TABLE R502.2.2.1
FASTENER SPACING FOR A SOUTHERN PINE OR HEM-FIR DECK LEDGER AND A 2-INCH NOMINAL SOLID-SAWN SPRUCE-PINE-FIR BAND JOISTc, f, g (Deck live load = 40 psf, deck dead load = 10 psf)

JOIST SPAN
6' and less
6'1" to 8'
8'1" to 10'
10'1" to 12'
12'1" to 14'
14'1" to 16'
16'1" to 18'
Connection details
On-center spacing of fastenersd, e
1/2 inch diameter lag screw with 15/32 inch maximum sheathinga
30
23
18
15
13
11
10
1/2 inch diameter bolt with 15/32 inch maximum sheathing
36
36
34
29
24
21
19
1/2 inch diameter bolt with 15/32 inch maximum sheathing and 1/2 inch stacked washersb, h
36
36
29
24
21
18
16


For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 1 pound per square foot = 0.0479kPa.
 
a. The tip of the lag screw shall fully extend beyond the inside face of the band joist.
 
b. The maximum gap between the face of the ledger board and face of the wall sheathing shall be 1/2.
 
c. Ledgers shall be flashed to prevent water from contacting the house band joist.
 
d. Lag screws and bolts shall be staggered in accordance with Section R502.2.2.1.1.
 
e. Deck ledger shall be minimum 2 × 8 pressure-preservative-treated No. 2 grade lumber, or other approved materials as established by standard engineering practice.
 
f. When solid-sawn pressure-preservative-treated deck ledgers are attached to a minimum 1 inch thick engineered wood product (structural composite lumber, laminated veneer lumber or wood structural panel band joist), the ledger attachment shall be designed in accordance with accepted engineering practice.
 
g. A minimum 1 × 91/2 Douglas Fir laminated veneer lumber rimboard shall be permitted in lieu of the 2-inch nominal band joist.
 
h. Wood structural panel sheathing, gypsum board sheathing or foam sheathing not exceeding 1 inch in thickness shall be permitted. The maximum distance between the face of the ledger board and the face of the band joist shall be 1 inch.