plan in advance by knowing the correct deck beam span to use. during your planning stage, dont forget to consider the spacing for your beams. you should also know the size of the post you are considering to use. see the deck post size table to make that determination because it will affect the size of beam you choose.
sizing deck beams got a lot easier with the publication of the 2015 international residential code. deck builders can now refer to section r507.6 deck beams and table r507.6 deck beam span lengths to determine the size of 2-ply and 3-ply built-up beams made from 2×6 through 2×12 lumber.
how to compute the spans for a deck how to compute the spans for a deck. building a deck? 4x4 lumber is strong enough for structural posts. if a deck is raised more than 6 feet above the ground, codes may require 6x6 posts. it also depends on the joist spacing; for instance, joists that are placed 24 inches apart must be wider than
the structural integrity of the railing depends heavily on the posts that support the rail structure. these posts should be no farther apart than six feet on the flat deck and no farther apart
a great number of variations can be used on deck railings, which use vertical balusters. depending on the size of the deck you may only need a railing post at each corner and on either side of the stairs top and bottom . the maximum distance between posts will be the length of your top rail.
joist layout ideas for stronger decks consider span, spacing, and depth to build beyond code for a small upcharge most deck builders would typically support the free end of a deck this size on a beam made from two 2x12s supported on three posts set 7 feet 6 inches apart. professional deck builder provides deck builders with news and
outdoor deck support post spacing. deck layout and footing position spacing diy deck plans . layout your deck outline on the ground by pushing spikes into the ground at the the house, or another structure, start with that and measure out to establish the outside edge. here is a list of some common joist sizes and maximum spans.
while the outdoor environment and the range of design options have remained relatively directions to deck builders to bolt deck beams to the sides of support posts. the average backyard deck has relatively few posts. fewer posts result in greater loads at beam connections. be sure floor joists are installed at the correct spacing. in
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 less than 8 feet apart. however, if your deck will include a hot tub or roof, you must support that weight with additional footings.
determine what size deck beam you need based on your support post spacing, as well as the proper concrete footing diameter, with our beam span calculator at decks.com.
however, if the spacing is too wide, the patio cover's beams will bow under the weight of the joists and roof covering materials. the determining factor of post spacing is the allowable span of your beams: in other words, the maximum distance it can cover without support from posts.
for most situations, you will want to place footings and posts less than 8' apart. if you are planning on installing a hot tub or porch on top of your deck, you will usually need more footings and posts to support the additional loads. decks with a lot of angles may also require additional footings.