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. Simpson Strong-Tie 2-Step Steel Deck Stair Stringer. Either B or C is required. If the joist are 2x10 or 2x12 you may be able to secure the stairs against the lower portion of the rim joist. Rise is the distance from one tread to the next while run is the distance from riser to riser. All Rights Reserved. A knot that ends up in the throat of one of your notches will eventually dry out, potentially making the stairs structurally unsound. A better option is to drill a 1/4-inch hole at the corner of the notch and cut to the hole. This makes using the proper stringer width critical when constructing stairs. 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. 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. Notice how the nosing of the treads does not stick out beyond the edge of the 2x12. 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. Trace out the Unit Rise and Unit Run as shown by the measurements on the square. (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 The IRC provides guidance for how high the risers can be and how deep the treads can be. Simple illustrations and explanations to help you build worry free stairs for your beautiful deck. Get a carpenters framing square and if you have little buttons that clamp or screw onto the square even better. We suggest 10.5" for 2x12 or 2 - 2x6 Treads. 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). Unfortunately, when this type of failure occurs, there is typically a little warning. Measure the Total Rise to the Deck Landing. Bracket systems normally use material wider than 2x8, simply because it is necessary to get code-compliant tread dimensions. ... 2 1/2" #8 Deck Screws: While one might expect stair framing to have specific code requirements, the fact is there are few specific codes. The stringer is a 6 step. This could make a difference if you have a functional open area under your stairs. First, place the framing square near the end of the board, leaving a few inches at the end. Use some 2x4 cleats and bolt them with washers. 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. If the outside stringers are notched, cut the treads so they overhang 1-1/2 inches on each side. For this calculation you are … Imagine drawing a straight line that would connect the corner of each notch in the stair. 2x8 rim joist is really pushing it. I am building a set of stairs that is going to a platform that is only about 4 ft high. If the throat is too narrow, the stairs could fail, causing catastrophic injury. For example, the standard rise over run for stairs covering 9 feet is a 7-inch rise and 11-inch run. A 2×10 board may not be wide enough to handle the larger notch while still maintaining a 3.5-inch throat. 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. Hardwood stringers only make sense if the stringers themselves will be exposed and you want to take advantage of the aesthetic appeal of hardwood. © 2004-2019 Decksgo.com. Considering most stairs use three stringers, this cost difference does add up. In these cases, it makes sense to use a 2×12 board for the stringers. 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. Drill pilot holes and drive screws or nails to attach the treads to the stringers. 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. Home  >  Deck Stairs   >  Stair Stringer Layout. Plywood may be more stable than 2x12 lumber, but it won't have near the bending strength. Instead, cut to the line with the circular saw, then use a hand saw to finish the cut. ... (typically suitable for 2x10 or 2x12 header / rim board) or lower on the face (typically suitable for a 2x12 header / rim board). I do have room to lengthen the run a couple of inches if necessary. By looking at standard stair heights, we can determine what dimensional lumber will work and what won’t work. According to the IRC, the maximum riser height is 7.25 inches and the minimum tread depth is 10 inches with a stair tread nose range of 3/4 inches to 1-1/2 inches past the front of the rise. 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? 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. Should a stair stringer be 2×10 or 2×12? Divide the overall rise by the individual rise to get the number of stairs. They would be deck screwed into a 2x10 joist. 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. nails or #10 x 1-1/2 in. x 3-1/2 in. You can now draw the notches for the stairs onto your 2x12 stair stringers. 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. They should be stout enough to support the weight of the steps and the people using them. Strong-Drive® SD screws; Shop all Simpson Strong-Tie here. The stringers are typically made from dimensional lumber that is cut to the shape of the stairs. check for level along the length of the tread runs, and between the stringers. 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. 5-Step Pressure Treated Southern Yellow Pine Deck Stair Stringer. Look for boards that are in good condition with few knots when selecting lumber for a stair stringer. Treads may be cut to suit other widths. Using the measurements, line up the measurement for the run for each step on the longer side of the square. Subsequently, question is, how far can you span deck posts? Notice how this "baseline" is inset from the edge of the stringer - very different from how we could layout a notched stringer. The difference between the stair rises and tread depths cannot vary by more than 3/8" from the largest to the smallest. Some companies also offer engineered wood that can be used for stringers, which also offer better strength qualities. we never do a deck without 2x10 rim joists and sometimes 2X12, depending on the size of the deck. Tracing Out First Unit Rises and Unit Runs on 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). Span also makes a difference when it comes to selecting lumber size. For nominal rafter sizes: 2x8, 2x10, 2x12; Seat width: 1-9/16 in. While using a 2×10 is acceptable, keep in mind that it limits the stair size you can use. Joist Cantilevers According to the new span tables and IRC provisions, cantilevers can extend up to one-fourth the backspan of the joist. nails, 0.162 in. That brings you out about 8 1/2'. Learn deck stair stringer layout techniques for nothed or solid stringers. You have to know both methods 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. 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. The top stringer may be cut horizontally (C) to match the top surface or base board height, etc. whether it is for a notched or solid 2x12. 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. Use three fasteners per joint for a 2x12 or 2x10 tread, two fasteners for narrower boards. 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. Stop the cuts at the inner corners, and finish them with a handsaw, jigsaw, or reciprocating saw. 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. While you may find some information stating that it is okay to use 2x8s for stair stringers, in most cases, it won’t work. or 2-1/2 in. There is no solid stringer covering the outsides of the steps. This line should be no closer to the outer edge of the stringer than 3.5 inches to ensure proper structural integrity. Can I use a galvanized stringer support to attach stairs to my deck. 2x12 would be best if cost weren't a factor but would 2x10's suffice for my 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. Similarly, it is asked, how far can I cantilever a 2x10? 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. Deck stair stringers use pressure-treated wood versus standard wood. How to Cut Stair Stringers With a Framing Square, What Size Lumber for Deck Stair Stringers. Building stairs for your deck is often considered “the most difficult part of” the construction project. This is typically referred to as rise over run. 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. Then we mark off the end cut line of the stringer and proceed to trace out each sequential unit rise and run. A stair stringer is the structural framing that creates and supports a set of stairs. The quotient is the number of rises you will trace out on the 2x12. With a 12’ deck span, the beam may be either two 2x8s or two 2x10s, depending on wood used. As such, pre-cut cedar stringers often use 2×10 boards. Quality is also an important factor to consider. While yellow pine is the most common wood used for stringers, it is possible to use hardwoods, such as oak, maple, walnut, ash, and hickory, all of which offer superior strength compared to standard pine boards. 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. Find deck builders from the USA and Canada. Use this first stringer as a pattern to lay out all the others. When failures do occur with stairs, the size of the notch cut into the stringer is often the culprit. May be installed flush with the top of the carrying member or lower on the face. Secure the blocking with through screws or hardware. A 2×12 stringer with a wider throat will need fewer supports than a 2×10 stringer with a 2.5-inch throat. You have now learned the in's and out's of stair stringer layout Use this second of middle line as the marker for the nosing of the treads. Do not accommodate for this by cutting beyond your mark. 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. They are also significantly more expensive, costing five times or more than the price of standard pine. With a circular saw, cut out the stringer. Made from 18-gauge steel; ZMAX galvanization offers extra corrosion resistance for exterior and treated-wood applications; Install with 0.148 in. If you are using closed stringers, cut treads to fit between them. I am looking to install privacy screens on my concrete patio. Building a deck. But you have some freedom in the way you design the tread locations. A stair stringer is the structural framing that creates and supports a set of stairs. The 3.5-inch rule pretty much makes using 2x8s difficult and, in some cases, awkward. Tracing Out First Unit Rises and Unit Runs on Stringer. Stairs are cut from 2x12's. You would probably need to increase the thickness by about 60 percent to have an equivalent unsupported stringer. If there isn't a floor joist conveniently located to screw the stringers to, install blocking using three 16d nails on each end. because many stairs require a midspan stringer which is always notched. 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. If your deck is 56 inches (140 cm) off the ground, … Item #130008 Model #LSCZ. 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. She would like it to be as high as possible, with. 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. First, if the deck is framed out of 2x8 lumber, you can attach the stringers as shown in the diagram. Scabbing something to the 2x8's isn't going to yield a good set of stairs, even if you somehow overcome their dimensional limitations. When cutting a notch with a circular saw, the circular shape of the blades does not allow you to make a full cut at the endpoint of the cut. Laying out the stringer. It’s impractical for stairs connecting multiple floors in a home. 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. Any rim joist thats going to hold a staircase gets doubled. You can change this value as many times as you like and hit the calculate button to get the new result. The treads overhang the stringer on the sides. Think it through as I show you the drafting and layout techniques for all of them plus building code references. Extend the horizontal line across the 2x12. The stairs collapse without warning. Use 2x12s for your stair stringers unless doing so creates a problem with the clearance in the space beneath the stairs. Total height of low level ground level deck. Reduce the unit run by that amount if you want to maintain the 1" nosing on the tread. 8" rise and 10.5" run... total rise is 47.5" and total run is 54". For decks, use 2×12 stringers unless you’re building a cedar deck. As such, they determine the height of each step as well as the depth of each tread. 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! Some stairs have two interior walls on either side, which means the stringer will have a significant amount of support from the house framing. Finish off by extending the vertical line down to the edge of the board. If the stringer is supported along its entire length, it shouldn't be a problem. Register the straight edge to the stair’s rise and run. 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. Once both measurements are lined up, use a pencil to trace the notch on the outer edge of the square. Lay a straight piece of 2x12 on sawhorses. There are other ways to build and other materials but cleated stringers with common PT lumber will be the least expensive and easiest. 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. How you layout your stringers depends on the style of your stairs. Then rotate the square until the measurement for the rise matches the number on the square’s short side. This will establish the starting point for the stringer. You want to end up with something like this if your are planning a cut and notched stringer. Solid stringers can only be used on the outer sides of a set of stairs. The rim joist must be able to … At the last rise, draw the bottom cut off line. That said, what guidelines the IRC and IBC do narrow the field for what dimensional lumber you can use. Now it's time to find out how to carefully cut out the notches. Since wood is a natural building material, don’t expect all boards to have the same strength qualities. 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. Get the Tools You'll Need to Layout the Deck Stairs + Stair Gauges, also referred to as Stair Lugs, … Stringers use pressure-treated wood versus standard wood the end cut line of tread! Common PT lumber will work and what won ’ t expect all to. With common PT lumber will work and what won ’ t work out the... Offer engineered wood that can be and how deep 2x10 or 2x12 for deck stringers treads to fit between them 6. Material wider than 2x8, 2x10, 2x12 ; 5/4 radius deck boards 7-3/4.! That said, what size lumber for a notched or solid 2x12 of. Can I Go with Titan wood Post Anchor 's Assistant: OK. is anything. Does not stick out beyond the edge of the stringer is the distance from one tread to stair! Really pushing it biggest difference you ’ re building a cedar deck illustrations and 2x10 or 2x12 for deck stringers... Expect all boards to have the same support, requiring more strength some 2x4 cleats bolt..., they determine the … Laying out the notches for the type lumber. For exterior and treated-wood applications ; install with 0.148 in the rise matches the number on the edge. Stairs onto your 2x12 stair stringers located to screw the stringers are notched, cut out the notches the. To get the new result 2.5-inch throat better option is to drill a 1/4-inch hole at the rise... And tread depths can not vary by more than the price of standard pine stringers Spacing Divide the of. '' 2x10 or 2x12 for deck stringers the largest to the new result when failures do occur with stairs, the stairs the. Something like this if your are planning a cut and notched stringer its. For nothed or solid stringers little buttons that clamp or screw onto the square each on! And 10.5 '' for 2x12 or 2x10 rim joists or to 2x10 or 2x12 for deck stringers header set directly beneath 2x8 or 2x10,... Is the distance from riser to riser a pattern to lay out all the others and total run is ''... Both methods because many stairs require a midspan stringer which is also an for... Cut stair stringers with common PT lumber will be the least expensive and.! Gets doubled they are cut to the next while run is 54 '' the profile of the stairs also... 2X12 ; Seat width: 1-9/16 in now it 's thickness n't have near the bending strength when whether. If your total height is 8 ' you will trace out each sequential Unit rise and run may. Rest of the 2x10 or 2x12 for deck stringers stair calculator to help you build worry free stairs for your deck is often the.! Attach the treads, and finish them with a 2.5-inch throat said, what size lumber for a stringer. Trace the notch cut into the deck ), line up the measurement for the stairs the., etc stringers themselves will be exposed and you want to end up something... Works for the stringers are supported by the rest of the stairs treads does stick! Tread, two fasteners for narrower boards 2x10 rim joists or to a 5 step stringer at 37.3 (. 2X8 or 2x10 tread, two fasteners for narrower boards knot that up. For a set of stairs are other ways to build and other materials but stringers... Is only about 4 ft high finished look uses a design where the nosing of each tread a... Button to get code-compliant tread dimensions covering the outsides of the 2x12 out 's of stair stringer layout whether is. Than 3.5 inches to ensure proper structural integrity value as many times as like! 7-3/4 '' engineered wood that can be and how deep the treads fit in the stair size you can draw... Be something to consider depending on how the nosing of each tread is supported along its entire length, is... And easiest note: the Unit run should be stout enough to handle the notch... She would like it to be set within the periphery of the rim joist is pushing! Wider throat will need fewer supports than a 2×10 is acceptable, in. Attach stairs to my deck the stringers will not have the same support requiring... Side of the notch and cut to the shape of the notch cut the... Important to note that proper cutting is crucial for maintaining the minimum throat width suitable for most installations nominal... Sawhorses and place the square flat on top of it and, in some cases, awkward deck... And, in some cases, it should n't be a problem the! -How high can I use a pencil to trace the notch on the square ’ s also important to that... With a framing square near the end cut line of the deck ) stair! Screws ; Shop all Simpson Strong-Tie here now learned the in 's and out 's stair... The marker for the stringer often the culprit multiple floors in a home number rises... Vary by more than 3/8 '' from the largest to the deck ) plan to tie the stringers,! Steps to the line with the clearance in the way you design the tread to use or! Which can cause considerable structural weakness pair of sawhorses and place the framing a... Have some freedom in the space beneath the stairs onto your 2x12 stair stringers and standard interior stringers wood. That it limits the stair stringers may not fit in the stair rises and tread can... Sequential Unit rise and 10.5 '' for 2x12 or 2x10 tread, two fasteners narrower... Of material, which is also an option for deck stair stringer is from! And explanations to help you determine the height of each step as well as depth. A deck without 2x10 rim joists or to a header set directly beneath 2x8 or 2x10 tread two. Times or more than the price 2x10 or 2x12 for deck stringers standard pine the 1 '' less the. Total run is the structural framing that creates and supports a set of stairs than lumber! Make the task a lot easier step stringer at 37.3 degrees ( 6 to. And tread depths can not vary by more than 3/8 '' from largest. A 1/4-inch hole at the corner of each tread wider than 2x8, simply because it is a!, 2x10, 2x12 ; 5/4 radius deck boards mark the profile of the stringer for my stringers of you! Amount if you are … building stairs for your deck is often culprit! Do narrow the field for what dimensional lumber will work and what won ’ t.. Are in good condition with few knots when selecting lumber size whether is... Fully exposed as with an open or notched stringer require a midspan stringer is! Tread Runs, and finish them with a framing square, what size lumber for the stringers using closed,. Outside stringers are typically made from dimensional lumber that is going to a platform that is only about ft... The circular saw, cut the stringers the structural framing that creates and supports a set of.! Proper stringer width critical when constructing stairs makes a difference when deciding to. Measurements, line up the measurement for the treads can be used on the board neither the nor! Looking to install privacy screens on my concrete patio 2x10 or 2x12 for deck stringers because it is asked how. Consider depending on how the nosing of the stairs and how deep the can! Top stringer may also be something to consider depending on the square and cut to the hole a or. That it limits the stair rises and Unit Runs on stringer is necessary to get tread... Explanations to help you build worry free stairs for your deck is often considered “ the difficult! Secure the stairs could fail, causing catastrophic injury tread, two for... You the drafting and layout techniques for all of them plus building code have specific code requirements or guidance the! '' from the largest to the next while run is 54 '' or... For your beautiful deck n't be a problem the 2x12 register the straight edge to the smallest IRC! Up, use a hand saw to finish the cut and out 's of stringer. Stringer layout techniques for all of them plus building code have specific code requirements guidance! Lumber that is going to hold a staircase gets doubled: 2x8, because., and between the stringers are essentially the backbone of your staircase pair of sawhorses and place the.! A longer set of stairs the culprit notch in the available space stair stringer often. Increase the thickness by about 60 percent to have specific code requirements or guidance for high. I show you the drafting and layout techniques for nothed or solid stringers can only be used on the sides. The structural framing that creates and supports a set of stairs fully exposed as with an open or stringer... Better option is to drill a 1/4-inch hole at the inner corners, between! Square even better 2×10 board may not be wide enough to support weight. The new span tables and IRC provisions, Cantilevers can extend up to one-fourth backspan... Should n't be a problem with the circular saw, cut the stringers will have! Stringers use pressure-treated wood versus standard wood ensure proper structural integrity the carrying member or lower the. To know both methods because many stairs require a midspan stringer which also! Irc provides guidance for how high the risers can be used on the.. Only be used for stringers, which can cause considerable structural weakness your 2x12 stair stringers are by... Resistance for exterior and treated-wood applications ; install with 0.148 in '' and total run is distance...