How deep should a concrete footing be for a deck?

For most deck applications, in most jurisdictions, the width of a footing should be 20 inches round and a minimum of 24 inches deep. It is important that the base of the footings be solid, and in many cases you will need to keep digging until you reach undisturbed soil.

How far apart do deck footings need to be?

How Many Footings Will I Need? The standard rule for footings is that for a basic deck, the larger the beam and footing size, the fewer footings you’ll need. If you’re building a simple deck, footings and posts should be placed 8 feet apart on average.

Do I need concrete footings for a deck?

Decks and other permanent structures require deck supports and footings made from structural strength concrete mix. NOTE: it is important to check local building codes for construction requirements in your area; these requirements will include minimum diameter and minimum depth of the footings.

How many concrete footings do I need for a deck?

Once you’ve completed the new deck, you’ll enjoy it for many years. Before starting to build, the first question is: How many footings do I need for a deck? For an attached 12 x 12′ deck, you’ll need at least 3 footings, plus at least 2 more if you’re planning on building stairs with it.

How deep and wide do footings need to be?

The minimum depth of footings below the surface of undisturbed soil, compacted fill material or controlled low strength material (CLSM) shall be 12 inches (305 mm). Where applicable, the requirements of CBC Section 1809.5 shall also be satisfied. The minimum width of footings shall be 12 inches (305 mm).

What is the maximum distance between deck posts?

Starting with your perimeter, mark the location of each deck post to locate the fitting position. In general, posts should be spaced no more than 8 feet apart. Some builders position them every 4 feet for a completely rigid frame. The maximum distance between footings is determined by the size of your joist material.

Do deck post need to be notched?

Notching a post does not weaken the structural integrity of the wood support post because the load for the deck is transferred down through the post to the footings. The upright notched section of the post acts stabilizes the beam.

How to construct proper footings for your deck?

Your deck plans likely call for posts to be set on each post base to be bolted to the deck framing later.

  • If plans call for posts,cut them a few inches above the finished height of the deck framing.
  • Set the posts in the post base and attach with appropriate post-base hardware nails or screws.

    • What are the building codes for concrete deck footers?

    BEAM SPAN Plan in advance by knowing the correct deck beam span to use. During your planning stage,don’t forget to consider the spacing for your beams.

  • JOIST SPAN The deck joist span is distance between supporting beams below the joists.
  • DECK BOARD SPAN

    • How many footing do you need for your deck?

    Maximum joist span of a 2X8 is 10’ – 6” at 16” o.c.

  • Maximum cantilever of a 2X8 is 24” at 16” o.c.
  • Maximum cantilever of a double 2X8 beam past a support post is 12”
  • Maximum span of a double 2×8 beam is 6’.
  • The standard size of most cardboard footing forms is 8” in diameter. This may change depending on your locale.

    • What size footings are required for decks?

    – Not Incised, S-P-F Beam Material – Flush hangered beam material must match Joist Depth – *2×8 beam overhang 1’ – Meet or exceeds Canadian Wood Council Requirements