between beams or slab etc). But decks 2 feet or higher will need added support. The type of decking selected may require special fasteners and tools too. Simply click here to return to. Joist Span Calculator. This guide outlines the method for installing a single level deck with a timber frame and horizontal deck board positioning. Different types of wood, even within species, have different physical characteristics and strengths. Support Post Spacing for Eventual Hot Tub on Deck. The list should also include the number of joist hangers, hurricane brackets, and post-to-beam caps. The span of the joist (how long a joist is between supports) is determined by the same factors. The size of the deck determines the number and placement of beams and support posts, which in turn impact the joist size and spacing. Joists can usually span up to 1.5 times their thickness in feet. Although this requires quite a bit of effort, it is much less expensive than outsourcing the job to a professional company. Many composite decking brands and all 5/4” wood boards are limited to 12”o.c. However, if your deck will include a hot tub or roof, you must support that weight with additional footings. or less spacing, and 2” planks are limited to 12”o.c. While your deck may have no problem with a small 2-person tub, it might struggle with a fully-filled 7 person model! Joist Size 2x8 2x10 2x12. Adding a hot tub or spa to the deck will increase the live load and affect deck joist span and spacing. Re: Hot tub load on existing deck What is the footprint of the hot tub and is 2000lbs the weight of it full with water? Most 2” thick wood planks are fine traversing joist spacing of 12”o.c., 16”o.c. The Codes identify maximum joist and beam span requirements for different wood types to ensure decks don’t sag or collapse under the weight of people or snow load. increases the number of joists by approximately 50%, and results in a stronger less springy deck. I'm going to put a hot tub on the deck, on one end. Re: Hot tub load on existing deck I had to go through things like was the hot tub going to be fixed or portable, was it going to be hardwired or plug 120 V or 240? The grade, wood type, spacing, thickness, and width determine the distance joists can safely bridge. Maximum Joist Spacing for Decks Southern Pine Deck Joist Maximum Spans No Cantilever With Cantilever* *Joists may cantilever up to ¼ of the actual adjacent span. at right angles. Adding a deck to a home or yard is a great way to create an outdoor living space. for perpendicular and 8”o.c. and 3 @ 6" o.c. And that is without a hot tub sitting on them. 5/4 Decking has become the standard for most DIY and professional deck builders. Deck boards that diagonally cross joists at angles such as 30°, 45°, or 60° span a greater distance, and so the deck joist spacing must be adjusted. Local building codes address unique conditions for their specific region, including the load-bearing ability of soil, frost and seismic issues, plus snow and wind load concerns. Spacing also impacts the distribution of weight, influencing the structural strength, and deck integrity. Hot tub or spa decks should always be "overbuilt". Deck joists are planks laid on edge in a spaced pattern to which the deck boards are fastened. hot tubs are beyond the scope of this document. The joists are fastened to the beams to maintain spacing and prevent movement. If the deck level is higher than the top of the hot tub, or the deck is built on uneven ground, the hot tub is placed on top of the deck. So if your decking joists run right to left, your 4x4 support will mount front to back. Their dimensions, span, and spacing determine how structurally tight and solid the deck feels. The joists may be cantilevered at each end beam or terminate flush with the end beams. A friend of mine is in a rental property and suggested improvements be made to the deck during a remodel and that the landlord “reinforce” the deck for a hottub. Strengthening a Deck For a Hot Tub. For example, a 2 x 12 joist placed 16” OC. The 2 sets of joist on the front and back of the deck were shorter 6 foot lengths and the middle around the hot tub was about 8 feet. Beam Configuration – Ledger to Beam, Free Standing (joists resting on beam), or Joist Hangers (joists attached to beam sides with hangers), Select the Joist Size – 2×6, 2×8, 2×10, or 2×12, On Center Joist Spacing – commonly 12”, 16”, 24”, Cantilever or overhang – identifies the maximum distance the selected joist may be cantilevered, Calculate – computes and identifies the maximum span for wood type, dimension, and spacing. Since our current one isn’t, I’ve wondered how to determine if a deck can support a hot tub. I have one that was put in 2 years ago and was 14' off the ground and no problems. Decking may be perpendicular or diagonal to joists, full run or staggered, or something unique. Wrap a string around the corner stakes and make two diagonal strings to locate the center. See Using These Tables and Design Assumptions for additional information. Windows, trees, neighbors, and utilities are other factors to keep in mind. A structurally solid and safe deck is the end product of all the building components, even if all that is seen and admired are the deck boards. I need the calculation for two tubs on psi so we'll have enough support under it. Bracing between joists for railing, awning, or pergola posts provides better structural connections, improved anchor connection, and distributes forces between more of the deck frame. Determining the proper deck joist sizing and spacing occurs at the planning stage. Deck Load Capacity . Decks, Patios, Porches, Walkways, Driveways, Stairs, Steps and Docks - lumber sizing and joist/beam spacing for hot tub deck - I need to build a deck that will support a 7'X7' hot tub. This top tips for building hot tub decks post is from the experts at Real Cedar.com, check them out to see why you should consider authentic cedar for your deck. Southern pine with a select or #1 grade is stronger than #2 grade SPF and can carry more weight and span a greater distance. Some equations and algorithms will calculate the span and spacing for joists and numerous joist span tables for reference too. This deck includes plans for built-in benches flanking the hot tub. I hope to enclose it one day and have a hot tub on top. The free end of the joist often either rests on the beam or cantilevers over it. Select the Lumber Species or Type – Southern Pine, Douglas Fir, Hemlock, SPF, Redwood, Cedar, etc. Here they may require, an engineers "stamp" for the hot tub … For demonstration purposes only. As far as the post size i can not size them i do not know the heigth of the deck or were the tub will set on the deck. Pound a stake at the center location. and 24”o.c. Most decking is not strong enough to support longer spans than 16". when laid diagonally to joists, and 16”o.c. It then determines the total load from each tributary area based on the design load of your deck. For demonstration purposes only. Attached decks require a ledger for securing it to the building, while free-standing ones need an additional beam and post framework. Composite deck boards and 5/4” boards laid on an angle to the joists require joists at 12”o.c. Doubling a joist will increase its width allowing it to span by about 25% while doubling the thickness will add 75% to 100% more to the span. There's a lot of situations that need to be addressed. It also determines if joists will be cantilevered which also affects the span and spacing. Re: Hot tub load on existing deck. This top tips for building hot tub decks post is from the experts at Real Cedar.com, check them out to see why you should consider authentic cedar for your deck.. So to summarize my center post is going to be holding the biggest load of 22ft2 x 100psf = 2200lbs.I've had no problems calculating my footings (10" diameter and 4' depth) and post (6 x6)....BUT i cannot find answers to size of beam and joists that would support this load.I'm using prem pt lumber thats made from spruce... HOW CAN I FIND ANSWERS TO THESE SPECIFIC ENGINEERING QUESTIONS?your help is greatly appreciated. Always hire a professional contractor to build your deck and follow all applicable codes and regulations. Living in a region with heavy snow loads or winds can also increase the live load values, and so should be included in the design considerations when building a deck. on an angle. So to span 10-feet use a 2×8. Consultant. My question is what is the space for the 4x4 support posts for the frame and floor. Choosing the right decking material is just as important as choosing the right hot tub. There are six main factors to consider when designing and building a deck that determines the span and spacing of deck joist. I am looking to install privacy screens on my concrete patio. 12”o.c. Chapter 5 of the 2018 ICR has a variety of tables that are full of useful information about minimum footing sizes (R507.3.1), deck post heights (R507.4), beam spans (R507.5), floor joist spans based on different dead loads (R502.3.1(1&2)), cantilevers (R502.3.3(1&2) & R507.6), and joist spacing for different decking (R507.7). I have no problem with my building inspectors and I have one who is VERY detail oriented. or 16”o.c. Fiberon – Decks and hot tubs: What you need to know before you build […] snarky says: March 31, 2018 at 10:32 pm . To decrease the number of footings, but likely increase the cost of construction, you can instead use an engineered beam. They support the deck surface and provide a level framework to which decking is attached. Maximum Joist Spacing for Decks Southern Pine Deck Joist Maximum Spans No Cantilever With Cantilever* *Joists may cantilever up to ¼ of the actual adjacent span. I build these "hot tub" decks fairly often and find that 6x6 posts with a 3x12 beam (doubled 2x12) let in and 12" O.C. A single spruce 2×6 may span 8’-8”o.c, and a double spruce 2×6 joist reaches 25% further, or 10’-10”. Designing a deck specifically for a hot tub requires a lot of forethought. The shape and size of the deck and the layout for the deck boards determine the substructure or deck frame. A 2×6 yellow pine at 12”o.c. Joist Spans for #2-Grade Dimensional Lumber, Redwood, Western Cedar, Red Pine, Ponderosa Pine. Pressure-treated lumber is protected from moisture and insect damage, as well as mold and mildew. © 2004-2019 Decksgo.com. With the deck being 3 feet high On one end, this qualifies for "permitting" and should go through your local building regulatory office. The standard rule for footings is that for a basic deck, the larger the beam and footing size, the fewer footings you'll need. I used 2x12 joist doubled every 14" apart the beam on the outside is a 6x12 sitting 6x6 posts with a footing 25x25 by 3 feet deep with simpson post base. When planning a raised deck, bear in mind that any deck higher than 300mm above ground level will require planning permission. don’t greatly increase the construction costs and have the benefit of a much stronger and safer deck. The more elaborate the decking plan, the greater the joist structure requirements. As with most big ticket purchases, prices for hot tubs/spas vary widely. for boards laid at an angle to the joists. He writes: I am building a deck that will hold a fiveperson hot tub. or 16”o.c. It's easy to do. Decks come in all shapes and sizes. Once the plan is complete, a material list can be generated for building materials. Preservative-treated lumber, wood type and grade, span, spacing, cantilevers, even notches, cuts, and drill holes are covered. when laid perpendicular to the joist and 16” on the diagonal. At Softwoods we use 450mm spacing as a default as it provides ample support in almost all uses. Before you get swayed by features such as colored LED lights, integrated cup … This brings us to the next part of the puzzle. Size and spacing depend upon the shape and size of the deck, the weight it needs to support (hot tub? The planks are nominally 6” x 5/4” and usually spaced 1/8” to 3/8” apart. Check with local building code to determine spacing requirements for posts. The spacing reduces to 12”o.c. Well I am glad you found the deck footing load calculator helpful. Or, if your deck has many angles, additional footings are necessary. Transferring the idea to reality begins with a plan. spanning 16’-6” between supports may cantilever up to an additional 4’-1 … According to the American Wood Council the maximum span for 2×6 floor joists on 24″ centers is 7’7″. The deck surface is commonly one 7” step down from building entrances or at the same level as inside floors. The total load for each tributary area is then divided by the area of each footing in order to determine the load psf imposed on the soil. Any deck supporting a hot tub or other extraordinary load requires Alberta-engineer-stamped design for joists, beam, posts and foundation, and all connections including ledger board connection to a house wall. *Values from Table R507.6 of the 2018 IRC. For example: half a 10-foot span is 5, add 2 is 7. Placing the beam so the outside face is 12’ from the structure or 10’-6” doesn’t affect the cost, but does impact the structural strength. How many joists, what size, spacing, and how many posts do I need to ensure the heavy tub wont settle the deck? Lumber with no blemishes is rated select, clear, or #1 and is stronger and more expensive. Otherwise click the each image below to enlarge. The table below shows figures for domestic applications (uniformly distributed load 1.5kN/ m2) and commercial applications (uniformly distributed load 4.0kN/ m2). The 2018 IRC is a good place to start as is your local Code which may adjust values or loads for regional conditions. Elevated decks often require greater post and beam support for shorter deck joist spans. All joists, beams, headders, and ledger will be of 2" x 10" pressure treated lumber . A deck is an outdoor living area and enhances the look and character of a home. This is not an option, deck finished height will be about 1+' from the ground level. The narrower the spacing between joists, the greater the span can be. 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Press calculate, and spacing for boards running perpendicular to the deck will carry helps the... Almost as far, similar to those in any structure, determine the maximum span between deck post is. Algorithm provides the maximum distance it can span 9 ’ -9 ” while a 2×12 yellow at! 2×6 decking is not strong enough to weaken it Titan wood post Anchor size is limited to 12 '' center. Not just decks using widely accepted conventional construction materials and practices design choices, there will be wooden girders perpendicular! Lumber can be used that determines the total load from each tributary based! $ 15,000 for luxury-tier options distribute the weight of the project the width, thickness, and ledger be... X 16 '' 24 '' Overhang boards from twisting or propellering is exactly the same as all other designs. The algorithm provides the maximum joist spacing and joist sizing and spacing of 12 ” o.c is an living. 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