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AFig.3:Beam span
. Table 1 provides you with the information to determine the minimum sizes of the footings, beams, and joists.The sizes
will depend on how big the deck will be and how many footings and posts are going to be used; how far the beam(s)
will span from post to post, or post to ledger; and how far the joist will span from beam to beam,or beam to ledger.
Note:The sizes, spans and spacing of the joists inTable 1 are the minimum/maximum allowed by code. If you want
your deck to be stiffer, increase the size, reduce the span, or reduce the spacing of your joists.
Note:The footings must bear on native soil.The footing details require a footing that is a minimum of 24 inches in
height so the bottom can be located a minimum of 18 inches below the finished grade and extend six inches above the
finished grade. If you have fill material that is greater than 18 inches deep,your footing will need to extend through the
fill to native soil. Footings for freestanding decks (those not attached to the house) are not required to be located 18
inches below the finished grade and can have a minimum thickness of eight inches.
Post sizes are 4x4 minimum for decks six feet or less above the ground and 4x6 for decks over six feet above the
ground. Use a minimum 4x6 post under all beam splices.
Mark the sizes, spacing and spans for the footings, beams,joists, and posts from Table 1 in the space provided below:
A. Joist Size: 2 x , spaced /6 apart.
B. Beam Size: "7 x / 2_
C. Post Size: 41x u / /
/ , spaced / Q apart.
D. Footing Size: 30° x /6/ x 914(.1*zi /eh)14.5 s = 3 ,
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Transfer your footings, beams,joists, and posts information above into the Deck Framing Plan at the end of this Guide
6-31-/ .. it
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DECK DESIGN GUIDE • 5