How Many Posts For Deck Beam
While code typically allows 3 8 inch diameter bolts for fastening braces to posts beams or joists i use 1 2 inch diameter bolts instead.
How many posts for deck beam. Obviously the larger the beam the greater the distance it can span between posts. Deck beams and joists go hand in hand as the framing materials for your deck. To cut the beams to the right length start by setting the end of a straight joist against the house at the edge of the deck layout. Beams are an essential part of a deck s support system so if you re building your own deck you want to make sure these elements are as sturdy and long lasting as possible many older decks were built using massive timbers such as 4x6s or 4x8s for beams which support the underside of the deck horizontally.
Code for nailing they will still check may warp and will shrink at the splices which allows moisture to get trapped with dirt promoting the compromise of the beams over time. Mark and cut the beams. The bigger you make your deck the more you ask of the framing timbers that hold up the deck s structure and the joists and beams that support the. The numbers in gray indicate the distance between the support posts.
Numbers in blue are joist spans beam to beam or house to beam. A redwood 4x6 beam should span no more than 6 between supporting posts. Unfortunately raised decks add more material and time to build. A double 2x12 beam can span 12 feet.
Maximum cantilever of a double 2x8 beam past a support post is. There s no penalty for exceeding code and it s easier to keep a single bolt size on hand 1 2 inch bolts are required for many other deck connections. The decks mentioned above assume you re building an attached deck. Your beams will need to bear the load of not only your decking materials but additional components of the frame itself.
If installing you ll need all materials for a ground level deck plus boards for your stairs the stair treads joist hangers and joist support posts that raise the actual deck. Square it by marking the house 6 feet from the deck corner and marking the joist 8 feet from the corner. While joists provide a horizontal support system for deck boards beams provide support for the joists. Recommended beam joist spans for deck framing.
A 2 2x10 can span 10 feet and so on. Dimensional lumber deck beam span chart. Refer to the deck beam span table below to assist in determining the maximum span of a given beam between posts. Adjust the joist until the diagonal between the marks measures 10 feet.
A cantilever is the unsupported end of a joist that extends past the last support post at the edge of your deck. Maximum cantilever of a 2x8 is 24 at 16 o c.