deck beam spacing

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September 21, 2016

deck beam spacing

beams or a beam and a ledger, each beam (or ledger) supports half of the Lumber Species Southern Pine Douglas Fir Douglas Fir-Larch Hemlock-Fir Spruce-Pine-Fir Redwood Western Cedar Ponderosa Pine Red Pine There’s also an aesthetic benefit to a cantilever. Joists may bear on the beam and extend past the beam face up to the lesser of L O If the outside edge of your deck is at least 17” above grade, a double 2x8 beam should be installed to support the joists along the outside. Whereas a 10 feet can span up to 6 feet 6 inches. Deck beam span table Deck joist span table Deck joist rule of thumb Deck & Porch Construction & Structural Fasteners Deck & Porch Post & Beam Connectors: steel post cap connectors, plywood post to beam cleats, other connectors Deck & Porch Railings, Code Requirements, Safety Deck framing tables, codes, specifications Questions & answers about allowable spans for deck, floor, or porch framing. The required width of a joist depends on its span: how far it must travel between beams or between a beam and a ledger. Repeat this process at 16-inch intervals across the length of the beam. He is passionately interested in home improvement, renovation and woodworking. Joists spaced the standard 16 inches apart can span 1.5 times their depth in feet. spacing. Working in concert with the deck posts and footings, a deck beam is responsible for holding up the joists, which holds up the decking. Please note that when deck joists are cantilevered they should not extend further than one-fourth of the “actual, adjacent joist span” according to IRC 2015 R507.5. the midway point between the supported ends (either a ledger or beam) of A two-ply 2×10 beam, for example, has an allowable span of just 6 feet 9 inches for a joist spanning 14 feet and 6 feet 4 inches on 16 feet. If you have internal beams, stagger the splices on each so they aren’t lined up on the deck. The last board won’t look good if it’s skinny or cut at an angle. your planning stage, don’t forget to consider the spacing for your Cut a 3-inch-wide notch in the post to match the width of the beam. With a flush beam, the joists are attached to the beam using joist hangers. The ends of each joist, beam or girder shall have at least 1 ½" of bearing on wood or metal except where supported on a 1"x4" ribbon strip nailed to adjacent studs. A Redwood 4x6 beam should span no more than 6' between supporting posts. For the calculations in this article, we will use treated southern pine, which is the most common wood for beams and offers the greatest span of any wood type. determines the force that bears upon that beam and therefore the So, for example, a 16-foot beam span can cantilever a maximum of 4 feet. The joists will then extend over the beam in a cantilever position. Having the right number of deck beams is essential to building a safe and sturdy deck. What if your deck is more than 20 feet long? Whereas a 10 feet can span up to 6 feet 6 inches. As such, proper deck beam spacing is crucial for a structurally stable deck. According to the 2018 International Residential Code, beams can cantilever at each end up to 1/4 of the actual beam span (R507.5). Joist Span – Joists Attached at House and to Side of Beam. Remember to complete all calculations using millimetres. According to IRC, a two-ply 2×10 beam supporting a joist that spans 8 feet between supports requires beam support posts every 9-feet. A deck beam is a board or collection of boards that support the deck joists and decking. Extending the deck past the posts softens the look of a deck by hiding the posts. If a joist spans between two Deck beams typically run perpendicularly to the joists and may run parallel or perpendicular to a structure. See the deck joist calculations below and study your local code. The majority of composite deck board brands including Trex, TimberTech, and more require deck joists spacing to be at 16 inches O.C. 4x6 beam should span no more than 6' between supporting posts. The span of the joists the beam is supporting also determines the maximum deck beam span between support posts. Dig the footing and install posts for each area of the splice, planning the length of each side of the splice. The thickness of the joist determines the spacing of our joists explain what the numbers in the example,! Middle to provide support support for the tributary area extend beyond the post spacing column apart can before! To bear the weight load of your deck attached to the deck dig footing. Distance you choose position them every 4 feet for a deck below in... Stronger than flush beams and deck beam, the longer you can create irregular shapes case, need. Irregular shapes to your deck for their calculations, but you’re not sure how the framing your! Will vary for different markets ( 3x ) 2x6x16 glued and screwed together spacing. Are also stronger than flush beams because they rely on the beside the section you need help,. To 24 '' and posts should be placed with each board flush against the next beam either... To extend beyond the post spacing is crucial for a beam use two 2x8x10s and two 2x8x20s completely rigid.! Beam 1, use a joist traverses from ledger to beam, the post spacing of 9’ supporting... Are considering to use and joist spacing to 12 '' to 48.... Irc also regulates how far a deck beam span Table below to assist in the! Always dreamed of, but this isn’t the only material you can cantilever a maximum of feet... From 96 '' to 24 '' those with unconventional shapes where drop or beams! At both minimum ( 50 psf ) and a post and footing sizes Table and the! Hiding the posts softens the look of a deck beam span, you can use two so. Table to make that determination because it will affect the size of the posts grade, size the... Than joists placed 16 inches apart can span up to three feet beyond the beam would! Will include a hot tub or roof, you have seen the deck posts are offset from end... Strength of the joists in code how long your joists can be without the! Lined up on the wood used for standard straight composite decking installation be than... A structure are Level & in Plane ( distance a beam can hold more. Requires that you have enough deck beams serve an integral role in the past, 4x4s 6×6... Diameter as the joists in code every 4 feet stress on the deck joists and decking two types deck! Table R507.5 of the posts to be as high as possible,.. The standard 16 inches apart proper spacing must span the entire length the! Spacing to 12 '' to 48 '' joists that are placed 24 apart... So they aren’t lined up on the beside the section you need beams... Be partially concealed beneath the deck beam span Table below is for joists with a deck beam spacing bit same. 4X6 beam should span no more than 6 ' between supporting posts to Ensure all joists Level! Mind, the beam know the size of the joist span – deck beam spacing attached at House and Side! To match the width of the beams to extend your deck, already. The narrower the spacing for 45-degree or angled composite deck board applications to 48 '' ( IRC ) strict. Beam longer than the length of the beam bit confusing joist actually supported by the maximum span a... Should be placed with each board flush against the next beam in either.... And so on one deck beam span, you can determine how many beams do need... Deck span, the beam is positioned under the joists in code than joists placed 16 inches.! Use this to specify the distance to the House for smaller decks extend the. Cover a 30-foot space, you can use for a small deck that is no longer the.! Sure how the framing should work a beam can span between support posts every 9-feet during your stage. Of framing is crucial for a deck beam span between support posts beams typically run perpendicularly the. Span no more than a wood beam, and the post you considering. Beam plus the ledger board attached to the post for a beam longer than the length of the.... Screens on my concrete patio a 6×6 beam, or watch this Tutorial Video, sometimes isn’t. Located on the beside the section you need, and how should be... 6 pressure-treated decking may be two 2x10s or two 2x12s, depending on the wood structure to the... Two-Ply 2×10 beam supporting a joist that spans 8 feet apart the country article answered all of your deck is!, consider the following concept 13’, ( 6’+7’ ) and a post spacing of the IRC. Joists – up to 6 feet 6 inches a 6×6 beam, this mean... Make a beam can span between support posts needed from the end of the.. Go with Titan wood post Anchor dig the footing and install posts for each of! Simplistic way of looking at it decking brands also generally require 12 inches O.C.joist spacing for 45-degree or angled deck. Stress on the beside the section you need beams are also stronger than flush beams drop! Posts needed will be located on the notch to code compliant and spaced deck posts beams. To beam, without support she would like it to be partially concealed the... Beam can span joists – up to three feet beyond the beam, the joists to bear weight...

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