Deck designer
Size
Size the deck.
16 by 12 ft, 3'-0" high, 192 sq ft
2x8 joists at 16 in span 9'-11"; 3 posts on one beam. Depth is the distance out from the house and stays at or under the width.
Attachment
Attach it, or let it stand alone.
Ledger on the house, wood band joist
2x8 ledger, 12 fasteners at 16-3/4 in o.c. as dimensioned (4 spaces at 16-11/16 in), max 18 in, flashed.
Stairs
Add stairs.
5 risers, 3'-0" wide, center
5 risers of 7.2 in, 4 treads of 10 in, 3 stringers, handrail on one side.
Guards
Guards and railings.
36 in guard, 96 balusters
This deck is over 30 in above the ground, so a guard is required. Guard posts are 4x4 on 2x8 or deeper joists.
Lumber
Pick the lumber.
Southern Pine, joists at 16 in, 2x8
2x8 joists, 2-ply 2x10 beam, 6x6 posts. Sizes come from DCA6 Tables 2, 3A and 4 at 40 psf live and 10 psf dead.
Decking
Pick the decking.
5/4x6 wood
Pressure-treated 5/4x6 boards, joists at 16 in or closer.
Footings
Footings and frost depth.
5 footings, 36 in down
Please confirm with your building department. Frost depth is set county by county, and 36 in is only a starting point until you check it.
5 footings, up to 20 in round and 8 in thick, bottom at least 12 in below grade. DCA6 does not cover snow over 40 psf.
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