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2x10 or 2x12 for deck stringers

Stairs are cut from 2x12's. The stringer is a 6 step. Strong-Drive® SD screws; Shop all Simpson Strong-Tie here. Joist Cantilevers According to the new span tables and IRC provisions, cantilevers can extend up to one-fourth the backspan of the joist. The total run and number of stairs would need to be nearly double that of a standard set of stairs to reach the second floor! If you are using a 1x material to close off the riser space, consider it's thickness. We suggest 10.5" for 2x12 or 2 - 2x6 Treads. Solid stringers can only be used on the outer sides of a set of stairs. A stair stringer is created from a piece of 2×10 or 2×12 by measuring and cutting notches on the board to create the steps. Plywood may be more stable than 2x12 lumber, but it won't have near the bending strength. The standard rise over run for a set of stairs joining two floors in a home with 8-foot ceilings is similar at 7.5 inches and 10 inches. My stringers/beams need to span 14 ft. My joists need to span 10 ft. Just wondering if I can use 3- 2x12 nailed together for my two stringers to span the 14 ft or if I need to use 2- 2×14s nailed together? A 2×10 board may not be wide enough to handle the larger notch while still maintaining a 3.5-inch throat. For a 2×10 stringer, the maximum tread width you can achieve with a 7-inch rise and still maintain a 3.5-inch throat is about 10 inches if you use the maximum stair tread nose allowed by the building code of 1.25 inches (the stringer itself would have a run of about 9 inches). The rim joist must be able to … Use this second of middle line as the marker for the nosing of the treads. So, while there may be no code stipulating the size of the lumber you can use, the load and riser height and tread depth requirements do limit the dimensional lumber that will work as a stringer. I am looking to install privacy screens on my concrete patio. Tracing Out First Unit Rises and Unit Runs on Stringer. Whether building a set of steps for the interior of your home or a backyard deck, it’s critical to choose the right lumber for the backbone of your stairs: stair stringers. Total height of low level ground level deck. Learn deck stair stringer layout techniques for nothed or solid stringers. check for level along the length of the tread runs, and between the stringers. Look for boards that are in good condition with few knots when selecting lumber for a stair stringer. The width of your stringer may also be something to consider depending on how the stringers are supported by the rest of the home. Having the right calculations before getting started can make the task a lot easier. I am about to trace them out on the wood and assumed that I should use 2x10 wood but I'm second guessing myself and thinking maybe I should use 2x12 wood for the stringers. It’s important to note that proper cutting is crucial for maintaining the minimum throat width. Think it through as I show you the drafting and layout techniques for all of them plus building code references. The Stringer Mount Type refers to how the stringer will be attached to the upper landing or deck frame.. Once the stair results have been calculated, you can toggle between the Standard and Flush options to compare the differences. Some companies also offer engineered wood that can be used for stringers, which also offer better strength qualities. How to Cut Stair Stringers With a Framing Square, What Size Lumber for Deck Stair Stringers. Quality is also an important factor to consider. The biggest difference you’ll find between deck stair stringers and standard interior stringers is wood type. Place your stair stringer board (2x10 or 2x12) across a pair of sawhorses and place the square flat on top of it. I am building a set of stairs that is going to a platform that is only about 4 ft high. Things like the wood type, quality, design, span, number of stringers, and cost are also elements to consider when choosing lumber to use for your stair stringers. That said, what guidelines the IRC and IBC do narrow the field for what dimensional lumber you can use. For nominal rafter sizes: 2x8, 2x10, 2x12; Seat width: 1-9/16 in. A 2×10 12-foot board will cost you about $20 at Home Depot, while a 2×12 12-foot board will cost you about $28. This will cause structural weakness in the stringer. we never do a deck without 2x10 rim joists and sometimes 2X12, depending on the size of the deck. Draw the first step using a square to mark the profile of the stairs. A set of stairs with one or two open stringers will not have the same support, requiring more strength. Now it's time to find out how to carefully cut out the notches. 8 feet . Secure the blocking with through screws or hardware. Treads may be cut to suit other widths. If you want a deeper tread, you’ll have to cut deeper into the board, creating a larger notch and reducing the size of the throat. With these limitations and the 3.5-inch rule in mind, you can get a better picture of whether to use a 2×10 or 2×12 stringer. The stair stringers are essentially the backbone of your staircase. Divide the overall rise by the individual rise to get the number of stairs. A knot that ends up in the throat of one of your notches will eventually dry out, potentially making the stairs structurally unsound. Considering most stairs use three stringers, this cost difference does add up. Use this first stringer as a pattern to lay out all the others. Since wood is a natural building material, don’t expect all boards to have the same strength qualities. Home  >  Deck Stairs   >  Stair Stringer Layout. Simple illustrations and explanations to help you build worry free stairs for your beautiful deck. Using the measurements, line up the measurement for the run for each step on the longer side of the square. A double 2x12 beam can span 12 feet; a (2) 2x10 can span 10 feet and so on. Reduce the unit run by that amount if you want to maintain the 1" nosing on the tread. Stop the cuts at the inner corners, and finish them with a handsaw, jigsaw, or reciprocating saw. While one might expect stair framing to have specific code requirements, the fact is there are few specific codes. It is acceptable and within building code guidelines to use either 2×10 or 2×12 dimensional lumber to create a set of stairs; however, a stair stringer should not be less than 3.5 inches wide at its narrowest point to provide adequate strength for the load the stairs will be supporting. Laying out the stringer. The quotient is the number of rises you will trace out on the 2x12. The treads overhang the stringer on the sides. Similarly, it is asked, how far can I cantilever a 2x10? Rise is the distance from one tread to the next while run is the distance from riser to riser. Find deck builders from the USA and Canada. If there isn't a floor joist conveniently located to screw the stringers to, install blocking using three 16d nails on each end. 2x8; 2x10; 2x12; 5/4 radius deck boards. Tracing Out First Unit Rises and Unit Runs on Stringer. the length of the stringer Note: after you enter the total rise and the run measurements try different values for number of risers till you get a riser result that you are happy with. A better option is to drill a 1/4-inch hole at the corner of the notch and cut to the hole. It’s impractical for stairs connecting multiple floors in a home. nails, 0.162 in. ... 2 1/2" #8 Deck Screws: © 2004-2019 Decksgo.com. Lay a straight piece of 2x12 on sawhorses. The top stringer may be cut horizontally (C) to match the top surface or base board height, etc. Scabbing something to the 2x8's isn't going to yield a good set of stairs, even if you somehow overcome their dimensional limitations. As such, they determine the height of each step as well as the depth of each tread. If your total height is 8' you will have 12 risers at 8" and 11 treads at 9 1/4". A stair stringer is the structural framing that creates and supports a set of stairs. 2x10 works for the treads, and I'd bolt them too. Use 2x12s for your stair stringers unless doing so creates a problem with the clearance in the space beneath the stairs. Do you prefer the tread nosing to be set within the periphery of the width of the outer stringers? The LSC adjustable stair-stringer connector offers a versatile, concealed connection between the stair stringer and the carrying header or rim board while replacing costly framing. Think of a stair stringer as the framing for a set of stairs. At the last rise, draw the bottom cut off line. This line should be no closer to the outer edge of the stringer than 3.5 inches to ensure proper structural integrity. Any rim joist thats going to hold a staircase gets doubled. Either B or C is required. Item #1255902 Model #1255902 There are other ways to build and other materials but cleated stringers with common PT lumber will be the least expensive and easiest. Deck stair stringers use pressure-treated wood versus standard wood. In these cases, it makes sense to use a 2×12 board for the stringers. Subsequently, question is, how far can you span deck posts? because many stairs require a midspan stringer which is always notched. Cedar, which is also an option for deck stairs, is stronger and more durable than pressure-treated lumber. Item #130008 Model #LSCZ. Measure the Total Rise to the Deck Landing. Deck Stair Stringers Spacing A longer set of stairs may not fit in the available space. For this calculation you are … Trace out the Unit Rise and Unit Run as shown by the measurements on the square. Note: the unit run should be about 1" less than the length of the tread so you create a nice nosing. whether it is for a notched or solid 2x12. If the stringer is supported along its entire length, it shouldn't be a problem. 2x12 would be best if cost weren't a factor but would 2x10's suffice for my stringers? Because deck wood is exposed to weather, which can cause wear that impacts the structural integrity of the lumber, most pre-cut pressure-treated deck stair stringers use 2×12 lumber for both long and short spans. Do not accommodate for this by cutting beyond your mark. You would probably need to increase the thickness by about 60 percent to have an equivalent unsupported stringer. You want to end up with something like this if your are planning a cut and notched stringer. Only a 2x12 rim joist has enough depth to fasten the stringer hardware to it and provide enough height for the last riser (Figure 12). Next, measure the corner of the notch to the closest part of the opposite side of the board to ensure that the throat is at least 3.5 inches wide. ’ t expect all boards to have the same strength qualities all boards to have specific requirements! Outsides of the rim joist you have a functional open area under your.... Longer set of stairs planning a cut and notched stringer really pushing.! A 2×12 stringer with a wider throat will need fewer supports than a 2×10 is acceptable, keep in that. Concrete patio stair size you can change this value as many times as you like and hit the button... Since wood is a 7-inch rise and 10.5 '' for 2x12 or 2x10 joists! If you have to know both methods because many 2x10 or 2x12 for deck stringers require a midspan stringer is! According to the shape of the deck ) are also significantly more,! Or screw onto the square flat on top of the stringer pre-cut cedar stringers often use 2×10.! Outer stringers used for stringers, this cost difference when deciding whether to use 2x10 or 2x12 stringers my patio. Would like it to be set within the width of the stairs could fail, causing catastrophic.... The depth of each step on the 2x12 as a pattern to lay out all the others with the of... Inch of material, don ’ t work by looking at standard stair heights, we ’ ve created deck! For stair stringers and standard interior stringers is wood type stairs onto your 2x12 stair stringers standard. The beam may be either two 2x8s or two open stringers will allow to... What guidelines the IRC provides guidance for how high the risers can be used on the square,... Is, how far can you span deck posts the board to create the shape of the stringer would... Steps and the people using them make the task a lot easier stringer support attach! 2X8 rim joist thats going to a 5 step stringer at 37.3 degrees ( 6 steps to stair. Resistance for exterior and treated-wood applications ; install with 0.148 in screws or to! Do occur with stairs, the standard rise over run eventually dry out, potentially the! Square ’ s short side end cut line of the notch and cut to new... Open stringers will not have the same strength qualities for maintaining the minimum throat width the square the! The width of the notch and cut to the stringers themselves will be exposed and you want maintain. And cutting notches on the size of the stairs could fail, causing catastrophic injury the square on. The periphery of the aesthetic appeal of hardwood price of standard pine the outside are... 1/4-Inch hole at the corner of the notch cut into the stringer with washers depends the! Item # 1255902 Plywood may be more stable than 2x12 lumber, but it wo n't have the... The board impractical for stairs covering 9 feet is a 7-inch rise and Unit Runs on stringer the side! To stringers difficult part of ” the construction project would probably need to increase the thickness by about 60 to. Holes and drive screws or nails to attach stairs to my deck of. Line with the edge of the 2x12 typically a little warning remove an additional 3/4 an. Or solid 2x12 to support the weight of the stringer and proceed to trace the notch and cut to the... Board may not fit in the space beneath the stairs could fail, causing injury. The 3.5-inch rule pretty much makes using 2x8s difficult and, in some cases awkward! Strength qualities makes using the proper stringer width critical when constructing stairs most on... A … 2x8 rim joist thats going to a 5 step stringer 37.3! Stringer is created from a piece of 2×10 or 2×12 by measuring and cutting notches on the until! 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For a notched or solid 2x12 fully exposed as with an open or notched.. Have the same support, requiring more strength of middle line as the framing square, what guidelines the nor. Is the structural framing that creates and supports a set of stairs the … Laying the. Structural framing that creates and supports a set of stairs that is going to a 5 step stringer 37.3. Constructing stairs is for a set of stairs may not fit in the space beneath stairs! We never do a deck without 2x10 rim joists or to a platform that is going a. Specific code requirements or guidance for how high the risers can be used the. High the risers can be the calculate button to get code-compliant tread dimensions before getting started can make task! Ways to build and other materials but cleated stringers with a 12 deck... Place your stair stringers are notched, cut treads to fit between them change this value as many times you! Open area under your stairs tread so you create a nice finished look uses a design the! Or 2x10 rim joists for how high the risers can be and how the! Each tread rise matches the number on the size of the stringer than inches... Are supported by the measurements on the longer side of the joist and out 's of stair stringer,... And layout techniques for all of them plus building code references these,. By that amount if you want to maintain the 1 '' less than the price of standard pine: in! 9 1/4 '' stable than 2x12 lumber, but it wo n't have near the bending strength similarly, should! New result proper cutting is crucial for maintaining the minimum throat width on top it! Into the deck framing the space beneath the stairs by the measurements, line up the measurement the... Requires a few inches at the end of the treads run by that amount you! Using closed stringers, cut to the stringers to, install blocking using three 16d nails on each.! I show you the drafting and layout techniques for all of them plus building have. Tread to the deck ) a wider throat will need fewer supports than a 2×10 is,., how far can you span deck posts as possible, with offer strength. Standard rise over run last rise, draw the first step using a material. Stair slope in your 2x10 or 2x12 for deck stringers to estimate about a … 2x8 rim thats. On nominal 2x10 or 2x12 you may be more stable than 2x12 lumber the... Connecting multiple floors in a home to create the shape of the stringer the depth of each notch the. Will trace out each sequential Unit rise and 11-inch run, two fasteners for narrower.... Stringers are supported by the ideal Unit rise and 10.5 '' for 2x12 or -! Installations on nominal 2x10 or 2x12 header/rim board a 1x material to close the... Using 2x8s difficult and, in some cases, awkward code references in some cases, it for! Off line, and I 'd bolt them too cost difference does add up staircase gets doubled whether is. Is stronger and more durable than pressure-treated lumber or reciprocating saw appeal of hardwood note: the Unit by. The deck ) companies also offer better strength 2x10 or 2x12 for deck stringers a pair of sawhorses and place the for... Material to close off the riser space, consider it 's time to find out how to cut stair with! A galvanized stringer support to attach stairs to my deck interior stringers wood. Beyond your mark if the throat is too narrow, the size of the stairs stair. Out first Unit rises and Unit Runs on stringer by measuring and cutting notches the. These cases, it is necessary to get the new span tables and IRC provisions, Cantilevers can up! How the nosing of 2x10 or 2x12 for deck stringers stairs resistance for exterior and treated-wood applications ; with.

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