| Lumber | Southern pine, No. 2 or better, treated or naturally durable |
|---|---|
| Joist span (ledger to beam) | 10' 6" (2×8 allows up to 11' 10" at 16") |
| Joist overhang past the beam | 1' 6" (2×8 allows up to 2' 5") |
| Beam | Double 2×10, 16' long (allows 8' 3" between posts) |
| Posts | 3 × 4x4, about 2' 7" tall (table allows up to 11') |
| Load on each inside post | 54 sq ft of deck |
| Footings | 19" round or 17" square, 6" thick, on 1,500 psf soil |
| Ledger fasteners (staggered) | ½" lag screws every 15", or ½" bolts every 29" (for up to ½" sheathing) |
The deck is more than 30 inches above the ground, so it needs guards (railings) at least 36 inches high on the open sides (IRC R312.1).
Footings go at least 12 inches into undisturbed soil and below your local frost depth. Ledgers can't be fastened to brick or stone veneer. This plan follows the code's prescriptive tables; your building department has the final say, and most decks need a permit.