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. Now it's time to find out how to carefully cut out the notches. Treads may be cut to suit other widths. Look for boards that are in good condition with few knots when selecting lumber for a stair stringer. 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. Deck Stair Stringers Spacing 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. closed. The top stringer may be cut horizontally (C) to match the top surface or base board height, etc. Item #130008 Model #LSCZ. because many stairs require a midspan stringer which is always notched. Any rim joist thats going to hold a staircase gets doubled. 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. Reduce the unit run by that amount if you want to maintain the 1" nosing on the tread. I am building a set of stairs that is going to a platform that is only about 4 ft high. 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. Find deck builders from the USA and Canada. 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. If you are using closed stringers, cut treads to fit between them. Where homeowners and builders connect with each other! Similarly, it is asked, how far can I cantilever a 2x10? 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 stringer. nails, 0.162 in. Divide the overall rise by the individual rise to get the number of stairs. Once both measurements are lined up, use a pencil to trace the notch on the outer edge of the square. It’s important to note that proper cutting is crucial for maintaining the minimum throat width. I am looking to install privacy screens on my concrete patio. If you are using a 1x material to close off the riser space, consider it's thickness. I do have room to lengthen the run a couple of inches if necessary. Divide the height of the stairs by the desired rise. Extend the horizontal line across the 2x12. Stop the cuts at the inner corners, and finish them with a handsaw, jigsaw, or reciprocating saw. 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. Think of a stair stringer as the framing for a set of stairs. You have now learned the in's and out's of stair stringer layout We suggest 10.5" for 2x12 or 2 - 2x6 Treads. You want to end up with something like this if your are planning a cut and notched stringer. Home  >  Deck Stairs   >  Stair Stringer Layout. If the joist are 2x10 or 2x12 you may be able to secure the stairs against the lower portion of the rim joist. 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. Use this first stringer as a pattern to lay out all the others. Neither the IRC nor International Building Code have specific code requirements or guidance for the type of lumber you can use for stair stringers. Rise is the distance from one tread to the next while run is the distance from riser to riser. Made from 18-gauge steel; ZMAX galvanization offers extra corrosion resistance for exterior and treated-wood applications; Install with 0.148 in. Get a carpenters framing square and if you have little buttons that clamp or screw onto the square even better. 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. 5-Step Pressure Treated Southern Yellow Pine Deck Stair Stringer. Then rotate the square until the measurement for the rise matches the number on the square’s short side. Notice how the nosing of the treads does not stick out beyond the edge of the 2x12. Item #1255902 Model #1255902 Finish off by extending the vertical line down to the edge of the board. 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. Suitable for most installations on nominal 2x10 or 2x12 header/rim board. A 2×10 board may not be wide enough to handle the larger notch while still maintaining a 3.5-inch throat. You can now draw the notches for the stairs onto your 2x12 stair stringers. 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). 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. Will your treads be fully exposed as with an open or notched stringer? As such, pre-cut cedar stringers often use 2×10 boards. 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. A set of stairs with one or two open stringers will not have the same support, requiring more strength. The quotient is the number of rises you will trace out on the 2x12. 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. While you may find some information stating that it is okay to use 2x8s for stair stringers, in most cases, it won’t work. For nominal rafter sizes: 2x8, 2x10, 2x12; Seat width: 1-9/16 in. They are cut to create the shape of the stairs. 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. The difference between the stair rises and tread depths cannot vary by more than 3/8" from the largest to the smallest. A stair stringer is the structural framing that creates and supports a set of stairs. All Rights Reserved. A 2×12 stringer with a wider throat will need fewer supports than a 2×10 stringer with a 2.5-inch throat. You would probably need to increase the thickness by about 60 percent to have an equivalent unsupported stringer. Some companies also offer engineered wood that can be used for stringers, which also offer better strength qualities. Use 2x12s for your stair stringers unless doing so creates a problem with the clearance in the space beneath the stairs. When failures do occur with stairs, the size of the notch cut into the stringer is often the culprit. This could make a difference if you have a functional open area under your stairs. The stairs collapse without warning. These are tried, tested and true methods of attaching stair treads to stringers. A better option is to drill a 1/4-inch hole at the corner of the notch and cut to the hole. Use the long-lasting stringer to build stairs on decks, gazebos, terraces and porches anywhere stairs will … nails or #10 x 1-1/2 in. Use some 2x4 cleats and bolt them with washers. 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). At the last rise, draw the bottom cut off line. 2x8 rim joist is really pushing it. How you layout your stringers depends on the style of your stairs. ... depending on how you plan to tie the stringers into the deck framing. While one might expect stair framing to have specific code requirements, the fact is there are few specific codes. Simpson Strong-Tie 2-Step Steel Deck Stair Stringer. Think it through as I show you the drafting and layout techniques for all of them plus building code references. They are also significantly more expensive, costing five times or more than the price of standard pine. we never do a deck without 2x10 rim joists and sometimes 2X12, depending on the size of the deck. The stringer is a 6 step. 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. If the stringer is supported along its entire length, it shouldn't be a problem. If your deck is 56 inches (140 cm) off the ground, … Learn deck stair stringer layout techniques for nothed or solid stringers. Joist Cantilevers According to the new span tables and IRC provisions, cantilevers can extend up to one-fourth the backspan of the joist. The rim joist must be able to … 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. 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. 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! Tutor's Assistant: OK. Is there anything else … Creating this kind of layout requires a few simple tricks. The quotient is the number of rises you will trace out on the 2x12. Do not accommodate for this by cutting beyond your mark. Some stairs have notched stringers everywhere. Drill pilot holes and drive screws or nails to attach the treads to the stringers. The biggest difference you’ll find between deck stair stringers and standard interior stringers is wood type. Since wood is a natural building material, don’t expect all boards to have the same strength qualities. 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. Total height of low level ground level deck. 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. Use this second of middle line as the marker for the nosing of the treads. Replaces additional framing and toe-nailing. 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. ... 2 1/2" #8 Deck Screws: If your total height is 8' you will have 12 risers at 8" and 11 treads at 9 1/4". 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. 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. As such, they determine the height of each step as well as the depth of each tread. Simple illustrations and explanations to help you build worry free stairs for your beautiful deck. Cedar, which is also an option for deck stairs, is stronger and more durable than pressure-treated lumber. Either B or C is required. The stair stringers are essentially the backbone of your staircase. You have to know both methods To simplify the process, we’ve created this deck stair calculator to help you determine the … Get the Tools You'll Need to Layout the Deck Stairs + Stair Gauges, also referred to as Stair Lugs, … There are other ways to build and other materials but cleated stringers with common PT lumber will be the least expensive and easiest. 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. Building stairs for your deck is often considered “the most difficult part of” the construction project. Note: the unit run should be about 1" less than the length of the tread so you create a nice nosing. A wider throat will need fewer supports than a 2×10 is acceptable, keep mind. To support the weight of the joist are 2x10 or 2x12 you may be cut horizontally C. Stringer and proceed to trace the notch on the square ’ s side. 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