2x10 or 2x12 for deck stringers

8 feet . 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? This deck is an example of that. Think it through as I show you the drafting and layout techniques for all of them plus building code references. Note: the unit run should be about 1" less than the length of the tread so you create a nice nosing. If you are using closed stringers, cut treads to fit between them. Learn deck stair stringer layout techniques for nothed or solid stringers. Tracing Out First Unit Rises and Unit Runs on Stringer. Trace out the Unit Rise and Unit Run as shown by the measurements on the square. Divide the overall rise by the individual rise to get the number of stairs. You would probably need to increase the thickness by about 60 percent to have an equivalent unsupported stringer. While one might expect stair framing to have specific code requirements, the fact is there are few specific codes. In these cases, it makes sense to use a 2×12 board for the stringers. Drill pilot holes and drive screws or nails to attach the treads to the stringers. Extend the horizontal line across the 2x12. Solid stringers can only be used on the outer sides of a set of stairs. Secure the blocking with through screws or hardware. 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. A set of stairs with one or two open stringers will not have the same support, requiring more strength. It’s also important to note that there is a nominal cost difference when deciding whether to use 2X10 or 2X12 stringers. A 2×10 board may not be wide enough to handle the larger notch while still maintaining a 3.5-inch throat. Reduce the unit run by that amount if you want to maintain the 1" nosing on the tread. The quotient is the number of rises you will trace out on the 2x12. Simpson Strong-Tie 2-Step Steel Deck Stair Stringer. Replaces additional framing and toe-nailing. 2x10 works for the treads, and I'd bolt them too. The top stringer may be cut horizontally (C) to match the top surface or base board height, etc. Creating this kind of layout requires a few simple tricks. Then slide the square down the board and continue to trace the shape of the stairs until you reach the other end of the board. Aside from making sure you have at least 5" from the bottom edge of the 2x12 to the inside corner of the throat or notch, you just have to do the cuts nicely. While it is possible to reach the minimum stair depth tread of 10 inches (again using the 1.25-inch maximum tread nose depth) while still maintaining the minimum throat width of 3.5 inches, you would have to go with an awkward stair rise of just 4 inches. Although 2×12 stringers are a bit more expensive than 2×10 stringers, the cost savings is not enough to warrant using the smaller dimensional lumber. Should a stair stringer be 2×10 or 2×12? Strong-Drive® SD screws; Shop all Simpson Strong-Tie here. Attaching Stairs to A Deck - Methods and Tips To attach notched stringers to a deck requires attaching some kind of backer board to the rim joist, increasing the width of the rim joist so the stringer has more material to contact. A stair stringer is the structural framing that creates and supports a set of stairs. They would be deck screwed into a 2x10 joist. It’s important to note that proper cutting is crucial for maintaining the minimum throat width. The stairs collapse without warning. Where homeowners and builders connect with each other! Home  >  Deck Stairs   >  Stair Stringer Layout. These are tried, tested and true methods of attaching stair treads to stringers. Just enter a zip code. Imagine drawing a straight line that would connect the corner of each notch in the stair. 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! My plan was to pour concrete footings, then run doubled up 2x8 beams setting on the footings, My wife is a stroke victim, and she wants this deck to be as easy as possible for her to walk out on. By looking at standard stair heights, we can determine what dimensional lumber will work and what won’t work. Instead, cut to the line with the circular saw, then use a hand saw to finish the cut. But you have some freedom in the way you design the tread locations. 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. As such, pre-cut cedar stringers often use 2×10 boards. Privacy Screens -How High Can I Go With Titan Wood Post Anchor? we never do a deck without 2x10 rim joists and sometimes 2X12, depending on the size of the deck. 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. Joist Cantilevers According to the new span tables and IRC provisions, cantilevers can extend up to one-fourth the backspan of the joist. For example, the standard rise over run for stairs covering 9 feet is a 7-inch rise and 11-inch run. nails or #10 x 1-1/2 in. Look for boards that are in good condition with few knots when selecting lumber for a stair stringer. 8-Step Pressure-Treated Cedar-Tone Pine Stair Stringer Get head starts building outdoor stairs with Get head starts building outdoor stairs with this durable, cedar-tone stair stringer. whether it is for a notched or solid 2x12. With a 12’ deck span, the beam may be either two 2x8s or two 2x10s, depending on wood used. Similarly, it is asked, how far can I cantilever a 2x10? 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. It’s important to understand that while this treatment makes the wood more resistant to weather and pests, it does not make the lumber structurally stronger. Place your stair stringer board (2x10 or 2x12) across a pair of sawhorses and place the square flat on top of it. While it’s possible to increase the tread depth by decreasing the riser height to make the notch small enough to maintain a 3.5-inch throat in a 2×10 board, it will take a longer run to reach the second level. Once you know the rise and run that you want your stairs to be, you can go ahead and draw out the cut lines on the 2×10 or 2×12. When failures do occur with stairs, the size of the notch cut into the stringer is often the culprit. Subsequently, question is, how far can you span deck posts? You can change this value as many times as you like and hit the calculate button to get the new result. There is no solid stringer covering the outsides of the steps. That said, what guidelines the IRC and IBC do narrow the field for what dimensional lumber you can use. Will your treads be fully exposed as with an open or notched stringer? There are other ways to build and other materials but cleated stringers with common PT lumber will be the least expensive and easiest. Use this second of middle line as the marker for the nosing of the treads. Having the right calculations before getting started can make the task a lot easier. Plywood may be more stable than 2x12 lumber, but it won't have near the bending strength. ... (typically suitable for 2x10 or 2x12 header / rim board) or lower on the face (typically suitable for a 2x12 header / rim board). A stair stringer is the structural framing that creates and supports a set of stairs. Once you know the rise and run of each step and you have calculated how long the stringer needs to be, you can determine how this will affect the throat width of each stringer. Then measure from the width of the throat, which is the shortest point between the corner of the step and the outer edge of the board. Find deck builders from the USA and Canada. This could make a difference if you have a functional open area under your stairs. Draw the first step using a square to mark the profile of the stairs. Using the measurements, line up the measurement for the run for each step on the longer side of the square. Span also makes a difference when it comes to selecting lumber size. 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. I do have room to lengthen the run a couple of inches if necessary. Unfortunately, when this type of failure occurs, there is typically a little warning. Do not accommodate for this by cutting beyond your mark. If you are using a 1x material to close off the riser space, consider it's thickness. Finish off by extending the vertical line down to the edge of the board. A knot that ends up in the throat of one of your notches will eventually dry out, potentially making the stairs structurally unsound. I just want to put up two 6x6 posts with Titan Wood Post Anchors, either 35 or 70 apart, I am building a 10'x12'deck (not attached to a ledger board). 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. Tracing Out First Unit Rises and Unit Runs on Stringer. You have to know both methods A longer set of stairs may not fit in the available space. Notice how this "baseline" is inset from the edge of the stringer - very different from how we could layout a notched stringer. Lay a straight piece of 2x12 on sawhorses. Use three fasteners per joint for a 2x12 or 2x10 tread, two fasteners for narrower boards. Rise is the distance from one tread to the next while run is the distance from riser to riser. 2x12 would be best if cost weren't a factor but would 2x10's suffice for my stringers? To simplify the process, we’ve created this deck stair calculator to help you determine the … The difference between the stair rises and tread depths cannot vary by more than 3/8" from the largest to the smallest. This may work in cases where you’re using just a few stairs for a single room with multiple levels, such as a sunken living room. 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. Since wood is a natural building material, don’t expect all boards to have the same strength qualities. Tutor's Assistant: OK. Is there anything else … They are cut to create the shape of the stairs. Deck stair stringers use pressure-treated wood versus standard wood. 2x8; 2x10; 2x12; 5/4 radius deck boards. A double 2x12 beam can span 12 feet; a (2) 2x10 can span 10 feet and so on. x 3-1/2 in. Treads may be cut to suit other widths. 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. 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. In the case of a stairwell that is supported on both sides by walls, 2×20 stringers are adequate as they gain the additional support of the wall studs. Can I use a galvanized stringer support to attach stairs to my deck. As such, they determine the height of each step as well as the depth of each tread. 2x8 rim joist is really pushing it. This will establish the starting point for the stringer. The International Building Code stipulates that a set of stairs must be able to handle a minimum concentrated load of about 40 pounds per square foot live, which refers to the temporary load placed upon the steps when someone is using them, or about 10 pounds per square foot dead, which is the amount of constant weight applied to the stairs. Stop the cuts at the inner corners, and finish them with a handsaw, jigsaw, or reciprocating saw. If your deck is 56 inches (140 cm) off the ground, … The biggest difference you’ll find between deck stair stringers and standard interior stringers is wood type. Simple illustrations and explanations to help you build worry free stairs for your beautiful deck. If there isn't a floor joist conveniently located to screw the stringers to, install blocking using three 16d nails on each end. Suitable for most installations on nominal 2x10 or 2x12 header/rim board. For the throat to be strong enough to support this load, it should be at least 3.5 inches wide, the same width as a 2×4. With a circular saw, cut out the stringer. 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. Think of a stair stringer as the framing for a set of stairs. First, if the deck is framed out of 2x8 lumber, you can attach the stringers as shown in the diagram. The treads overhang the stringer on the sides. 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. because many stairs require a midspan stringer which is always notched. For decks, use 2×12 stringers unless you’re building a cedar deck. Use some 2x4 cleats and bolt them with washers. Some stairs have two interior walls on either side, which means the stringer will have a significant amount of support from the house framing. The width of your stringer may also be something to consider depending on how the stringers are supported by the rest of the home. She would like it to be as high as possible, with. Cedar, which is also an option for deck stairs, is stronger and more durable than pressure-treated lumber. We use this little line with the two dots as the "baseline" or the line from which we will reference each unit rise and run. I am looking to install privacy screens on my concrete patio. Scabbing something to the 2x8's isn't going to yield a good set of stairs, even if you somehow overcome their dimensional limitations. Get the Tools You'll Need to Layout the Deck Stairs + Stair Gauges, also referred to as Stair Lugs, … If the outside stringers are notched, cut the treads so they overhang 1-1/2 inches on each side. or 2-1/2 in. Neither the IRC nor International Building Code have specific code requirements or guidance for the type of lumber you can use for stair stringers. This works out to a 5 step stringer at 37.3 degrees (6 steps to the deck). ... depending on how you plan to tie the stringers into the deck framing. 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. All Rights Reserved. The rim joist must be able to … Total height of low level ground level deck. If the throat is too narrow, the stairs could fail, causing catastrophic injury. The stair stringers are essentially the backbone of your staircase. 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. They are also significantly more expensive, costing five times or more than the price of standard pine. (Circle One) {#1} Stair Stringers—2x10; 2x12; Other (Circle One) {#5} Treated; Redwood, Cedar; Other (Circle One) {#6} Deck Balustrade—Wood, Metal, Composite, Other (When using tapered or decorative balusters, Remember the maximum Made from 18-gauge steel; ZMAX galvanization offers extra corrosion resistance for exterior and treated-wood applications; Install with 0.148 in. The 3.5-inch rule pretty much makes using 2x8s difficult and, in some cases, awkward. Picture a stair slope in your mind to estimate about a … © 2004-2019 Decksgo.com. 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. How to Cut Stair Stringers With a Framing Square, What Size Lumber for Deck Stair Stringers. A notch that is too deep for the board creates a throat (the space between the corner of the notch and the opposing edge of the board) that is too narrow to hold an adequate load. While you may find some information stating that it is okay to use 2x8s for stair stringers, in most cases, it won’t work. In some cases in which there is living space under the stairs, it may make sense to use 1 x10 stringer, which will give you an additional couple of inches of clearance for the headroom. While using a 2×10 is acceptable, keep in mind that it limits the stair size you can use. Bracket systems normally use material wider than 2x8, simply because it is necessary to get code-compliant tread dimensions. A 2×12 stringer with a wider throat will need fewer supports than a 2×10 stringer with a 2.5-inch throat. 8" rise and 10.5" run... total rise is 47.5" and total run is 54". Measure the Total Rise to the Deck Landing. x 3 in. Use 2x12s for your stair stringers unless doing so creates a problem with the clearance in the space beneath the stairs. This line should be no closer to the outer edge of the stringer than 3.5 inches to ensure proper structural integrity. A nice finished look uses a design where the nosing of each tread is hidden within the width of the stringer. We suggest 10.5" for 2x12 or 2 - 2x6 Treads. Given how critical the structural integrity of stair stringers is, it almost always makes sense to err on the side of caution and go with 2×12 lumber. the stringer. Do you prefer the tread nosing to be set within the periphery of the width of the outer stringers? check for level along the length of the tread runs, and between the stringers. Stairs are cut from 2x12's. Overcut can remove an additional 3/4 of an inch of material, which can cause considerable structural weakness. This makes using the proper stringer width critical when constructing stairs. This is typically referred to as rise over run. 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. Some companies also offer engineered wood that can be used for stringers, which also offer better strength qualities. 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). On 2019-07-31 - by (mod) - Steve I'd like to see a photo, but yes it's quite possible that someone felt that the stairs were not adequately supported by the stringers so added a post at mid-span. Using the inside measurements on the square adjust the placement of the square so that it aligns exactly with the edge of the board corresponding to your rise and run (6-13/16" of rise and 9-3/4" run from the example above). Align the rise and run measurements on the square with the edge of Use the long-lasting stringer to build stairs on decks, gazebos, terraces and porches anywhere stairs will … First, place the framing square near the end of the board, leaving a few inches at the end. Deck Stair Stringers Spacing Divide the height of the stairs by the desired rise. At the last rise, draw the bottom cut off line. Get a carpenters framing square and if you have little buttons that clamp or screw onto the square even better. If the joist are 2x10 or 2x12 you may be able to secure the stairs against the lower portion of the rim joist. Laying out the stringer. For nominal rafter sizes: 2x8, 2x10, 2x12; Seat width: 1-9/16 in. Some stairs have notched stringers everywhere. Using 2x12 lumber for the stringers will allow you to cut the stringers so they fit up and behind the rim joist. Register the straight edge to the stair’s rise and run. The stringer is a 6 step. How you layout your stringers depends on the style of your stairs. Hardwood stringers only make sense if the stringers themselves will be exposed and you want to take advantage of the aesthetic appeal of hardwood. 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. 5-Step Pressure Treated Southern Yellow Pine Deck Stair Stringer. Item #130008 Model #LSCZ. The stringers are typically made from dimensional lumber that is cut to the shape of the stairs. I mount stair stringers directly to 2x12 rim joists or to a header set directly beneath 2x8 or 2x10 rim joists. Building a deck. Once both measurements are lined up, use a pencil to trace the notch on the outer edge of the square. That brings you out about 8 1/2'. I am building a set of stairs that is going to a platform that is only about 4 ft high. It’s impractical for stairs connecting multiple floors in a home. Since the Tread Depth [B] is a constant, when using the Automatic Stair Calculator, the Total Run [G] will vary when you toggle between the two mount options. They should be stout enough to support the weight of the steps and the people using them. A better option is to drill a 1/4-inch hole at the corner of the notch and cut to the hole. Divide that number by the ideal Unit rise of 7-3/4". Any rim joist thats going to hold a staircase gets doubled. nails, 0.162 in. Building stairs for your deck is often considered “the most difficult part of” the construction project. You have now learned the in's and out's of stair stringer layout 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).

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