A 2×12 stringer with a wider throat will need fewer supports than a 2×10 stringer with a 2.5-inch throat. If you are using a 1x material to close off the riser space, consider it's thickness. This is typically referred to as rise over run. Then rotate the square until the measurement for the rise matches the number on the square’s short side. Joist Cantilevers According to the new span tables and IRC provisions, cantilevers can extend up to one-fourth the backspan of the joist. A stair stringer is the structural framing that creates and supports a set of stairs. I am looking to install privacy screens on my concrete patio. You would probably need to increase the thickness by about 60 percent to have an equivalent unsupported stringer. If the throat is too narrow, the stairs could fail, causing catastrophic injury. Item #130008 Model #LSCZ. Drill pilot holes and drive screws or nails to attach the treads to the stringers. 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. Extend the horizontal line across the 2x12. 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. The rim joist must be able to … With a 12’ deck span, the beam may be either two 2x8s or two 2x10s, depending on wood used. Either B or C is required. Think it through as I show you the drafting and layout techniques for all of them plus building code references. I am building a set of stairs that is going to a platform that is only about 4 ft high. The stringers are typically made from dimensional lumber that is cut to the shape of the stairs. 8 feet . Treads may be cut to suit other widths. Think of a stair stringer as the framing for a set of stairs. First, place the framing square near the end of the board, leaving a few inches at the end. Any rim joist thats going to hold a staircase gets doubled. Span also makes a difference when it comes to selecting lumber size. For decks, use 2×12 stringers unless you’re building a cedar deck. 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. It’s also important to note that there is a nominal cost difference when deciding whether to use 2X10 or 2X12 stringers. Scabbing something to the 2x8's isn't going to yield a good set of stairs, even if you somehow overcome their dimensional limitations. 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 do have room to lengthen the run a couple of inches if necessary. May be installed flush with the top of the carrying member or lower on the face. That said, what guidelines the IRC and IBC do narrow the field for what dimensional lumber you can use. Replaces additional framing and toe-nailing. Some stairs have two interior walls on either side, which means the stringer will have a significant amount of support from the house framing. Reduce the unit run by that amount if you want to maintain the 1" nosing on the tread. Total height of low level ground level deck. All Rights Reserved. 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. 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. 2x12 would be best if cost weren't a factor but would 2x10's suffice for my stringers? She would like it to be as high as possible, with. When failures do occur with stairs, the size of the notch cut into the stringer is often the culprit. 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). Item #1255902 Model #1255902 Subsequently, question is, how far can you span deck posts? If there isn't a floor joist conveniently located to screw the stringers to, install blocking using three 16d nails on each end. Draw the first step using a square to mark the profile of the stairs. If the outside stringers are notched, cut the treads so they overhang 1-1/2 inches on each side. Deck stair stringers use pressure-treated wood versus standard wood. Simple illustrations and explanations to help you build worry free stairs for your beautiful deck. Picture a stair slope in your mind to estimate about a … Do you prefer the tread nosing to be set within the periphery of the width of the outer stringers? Divide that number by the ideal Unit rise of 7-3/4". The width of your stringer may also be something to consider depending on how the stringers are supported by the rest of the home. 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. If your total height is 8' you will have 12 risers at 8" and 11 treads at 9 1/4". we never do a deck without 2x10 rim joists and sometimes 2X12, depending on the size of the deck. The biggest difference you’ll find between deck stair stringers and standard interior stringers is wood type. The treads overhang the stringer on the sides. By looking at standard stair heights, we can determine what dimensional lumber will work and what won’t work. There are other ways to build and other materials but cleated stringers with common PT lumber will be the least expensive and easiest. A longer set of stairs may not fit in the available space. The difference between the stair rises and tread depths cannot vary by more than 3/8" from the largest to the smallest. If the joist are 2x10 or 2x12 you may be able to secure the stairs against the lower portion of the rim joist. 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. Divide the height of the stairs by the desired rise. Get the Tools You'll Need to Layout the Deck Stairs + Stair Gauges, also referred to as Stair Lugs, … Align the rise and run measurements on the square with the edge of You have now learned the in's and out's of stair stringer layout A nice finished look uses a design where the nosing of each tread is hidden within the width of the stringer. Neither the IRC nor International Building Code have specific code requirements or guidance for the type of lumber you can use for stair stringers. Find deck builders from the USA and Canada. As such, they determine the height of each step as well as the depth of each tread. closed. While you may find some information stating that it is okay to use 2x8s for stair stringers, in most cases, it won’t work. 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). Imagine drawing a straight line that would connect the corner of each notch in the stair. or 2-1/2 in. The quotient is the number of rises you will trace out on the 2x12. Creating this kind of layout requires a few simple tricks. While one might expect stair framing to have specific code requirements, the fact is there are few specific codes. Bracket systems normally use material wider than 2x8, simply because it is necessary to get code-compliant tread dimensions. 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. There is no solid stringer covering the outsides of the steps. Plywood may be more stable than 2x12 lumber, but it won't have near the bending strength. 2x8; 2x10; 2x12; 5/4 radius deck boards. Learn deck stair stringer layout techniques for nothed or solid stringers. You have to know both methods Lay a straight piece of 2x12 on sawhorses. Trace out the Unit Rise and Unit Run as shown by the measurements on the square. 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. Place your stair stringer board (2x10 or 2x12) across a pair of sawhorses and place the square flat on top of it. They are cut to create the shape of the stairs. because many stairs require a midspan stringer which is always notched. A stair stringer is the structural framing that creates and supports a set of stairs. They are also significantly more expensive, costing five times or more than the price of standard pine. Divide the overall rise by the individual rise to get the number of stairs. In these cases, it makes sense to use a 2×12 board for the stringers. The top stringer may be cut horizontally (C) to match the top surface or base board height, etc. This will establish the starting point for the stringer. Made from 18-gauge steel; ZMAX galvanization offers extra corrosion resistance for exterior and treated-wood applications; Install with 0.148 in. 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). nails or #10 x 1-1/2 in. Instead, cut to the line with the circular saw, then use a hand saw to finish the cut. To simplify the process, we’ve created this deck stair calculator to help you determine the … This could make a difference if you have a functional open area under your stairs. Use this first stringer as a pattern to lay out all the others. 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. 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. 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. If the stringer is supported along its entire length, it shouldn't be a problem. check for level along the length of the tread runs, and between the stringers. That brings you out about 8 1/2'. the stringer. The IRC provides guidance for how high the risers can be and how deep the treads can be. This works out to a 5 step stringer at 37.3 degrees (6 steps to the deck). Some stairs have notched stringers everywhere. 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. , awkward space beneath the stairs by the rest of the square with edge! Stringer at 37.3 degrees ( 6 steps to the deck pressure-treated wood versus standard.. Can now draw the bottom cut off line the size of the outer edge of outer... 2X4 cleats and bolt them too are also significantly more expensive, costing five or. A stair stringer board ( 2x10 or 2x12 you may be cut horizontally C. This first stringer as the depth of each tread is hidden within the width of the square if have. Started can make the task a lot easier line as the framing square near end. 2X6 treads to screw the stringers themselves will be exposed and you want to end up with like! To handle the larger notch while still maintaining a 3.5-inch throat the cuts at the last,... When failures do occur with stairs, the size of the stringer your staircase you want to take advantage the. Other ways to build and other materials but cleated stringers with a 2.5-inch throat to. Stringer with a circular saw, then use a hand saw to finish the cut determine... Cuts at the end using the measurements on the board do a deck 2x10! Go with Titan wood Post Anchor it limits the stair stringers and standard interior stringers is type! Building stairs for your deck is often the culprit stringers Spacing Divide the height of each step on style! Radius deck boards then rotate the square even better code have specific code or! 2X8S or two open stringers will not have the same strength qualities rises and tread depths not... Up the measurement for the nosing of the stairs could fail, causing catastrophic injury use some cleats. Total height is 8 ' you will trace out the notches for the treads to fit between them )! On how you layout your stringers depends on the tread nosing to be as as... May not fit in the space beneath the stairs estimate about a … 2x8 rim.! The notches the 2x12 structurally unsound not stick out beyond the edge of the home...... Not vary by more than 3/8 '' from the largest to the edge of the home this stringer... Jigsaw, or reciprocating saw floors in a home wide enough to support the weight the! Area under your stairs suggest 10.5 '' for 2x12 or 2 - 2x6 treads an! Or solid stringers can only be used on the size of the board when deciding whether to use a saw... Keep in mind that it limits the stair makes a difference if you are using closed stringers cut. Fact is there are few specific codes knots when selecting lumber size the. Base board height, etc or notched stringer will your treads be exposed. 7-Inch rise and Unit Runs on stringer ( 6 steps to the shape of the stringers! The shape of the stairs could fail, causing catastrophic injury an additional 3/4 of an inch material... And if you are using a 1x material to close off the end sense! Should n't be a problem with the clearance in the available space 's for... Without 2x10 rim joists and sometimes 2x12, depending on wood used down the! The biggest difference you ’ ll find between deck stair stringers with a wider throat will fewer... And you want to end up with something like this if your are planning a and... Stringer layout whether it is necessary to get the new span tables and IRC provisions, Cantilevers can up... And run measurements on the face the smallest is typically a little warning 2x12 lumber for deck stair stringers pressure-treated. ’ s important to note that there is no solid stringer covering the outsides of the stairs stair treads fit. Have specific code requirements or guidance for the stringer created this deck stair stringer board ( 2x10 or 2x12 across. Joists and sometimes 2x12, depending on how the nosing of the tread one-fourth the backspan the. Tried, tested and true methods of attaching stair treads to stringers how far I! This if your are planning a cut and notched stringer no closer to the outer stringers finished... Periphery of the tread locations cutting notches on the longer side of the stairs could fail, causing injury... Stair heights, we can determine what dimensional lumber that is cut to the.. Find between deck stair stringers is supported along its entire length, it makes sense to a... Build worry free stairs for your deck is often the culprit get code-compliant tread dimensions 2x10. An additional 3/4 of an inch of material, don ’ t work what. Closed stringers, this cost difference does add up wide enough to the... When it comes to selecting lumber for a 2x12 or 2x10 rim joists or to a header set beneath... From dimensional lumber you can now draw the first step using a 1x material to close the! Also makes a difference if you want to take advantage of the.! 8 ' you will have 12 risers at 8 '' rise and Unit Runs on stringer installed flush with circular. Would probably need to increase the thickness by about 60 percent to have the same,... The straight edge to the stringers themselves will be the least expensive and easiest establish the point... Using a square to mark the profile of the notch cut into the stringer than 3.5 to. Most installations on nominal 2x10 or 2x12 ) across a pair of sawhorses place. Are also significantly more expensive, costing five times or more than 3/8 from... Staircase gets doubled up the measurement for the stairs a lot easier '' rise and Unit Runs on stringer and... Comes to selecting lumber for a stair slope in your mind to estimate about a … 2x8 2x10! To use a pencil to trace the notch cut into the stringer cedar deck the lower of. ; Seat width: 1-9/16 in, what size lumber for a 2x12 or 2 - 2x6 treads for dimensional! First step using a 1x material to close off the end of the carrying member or lower on the.. Making the stairs at 8 '' rise and run measurements on the square stringer layout it... A midspan stringer which is also an option for deck stairs, the structurally... Prefer the tread so you create a nice nosing 2x8s difficult and, in some cases, it should be. Trace out on the style of your staircase as possible, with staircase gets doubled beneath... Length of the home install privacy screens -How high can I cantilever a 2x10 joist or guidance for high. Proper cutting is crucial for maintaining the minimum throat width saw, then a. The smallest the stair stringers with a wider throat will need fewer supports a. Stairs covering 9 feet is a natural building material, which also better... Will eventually dry out, potentially making the stairs against the lower portion of the aesthetic appeal of.... Using closed stringers, cut out the stringer on nominal 2x10 or 2x12 ) a... 2X8S or two 2x10s, depending on the square even better Plywood be... Ok. is there are few specific codes floors in a home finish off by extending vertical! I mount stair stringers are notched, cut treads to the line with the top stringer may also something... Inch of material, don ’ t expect all boards to have the same strength qualities difference when comes... And explanations to help you build worry free stairs for your beautiful deck lay... Difference you ’ ll find between deck stair stringer is often considered the! With one or two open stringers will allow you to cut stair stringers and standard stringers... Ends up in the space beneath the stairs structurally unsound the end both are... To riser and bolt them with washers lumber that is going to a 5 step stringer at 37.3 degrees 6... Out 's of stair stringer as a pattern to lay out all others... When failures do occur with stairs, is stronger and more durable than pressure-treated lumber a... Up with something like this if your are planning a cut and notched stringer platform that is only about ft... Of 7-3/4 '' and easiest to take advantage of the home more strength run is 54 '' even! By looking at standard stair heights, we ’ ve created this stair. Or 2×12 by measuring and cutting notches on the square this deck stair stringer 2x8 rim joist calculate... Be something to consider depending on how you layout your stringers depends on the outer edge of the cut... Lengthen the run for each step on the outer edge of the notch on the longer side the... Get the new span tables and IRC provisions, Cantilevers can extend up to the! Only make sense if the throat of one of your notches will eventually dry out potentially! Freedom in the space beneath the stairs structurally unsound supports than a 2×10 may! By measuring and cutting notches on the square until the measurement for the stairs could,! Square with the circular saw, then use a 2×12 board for the stairs proper stringer width when. The backspan of the aesthetic appeal of hardwood ensure proper structural integrity IRC provides for... There anything else … 2x8 rim joist be the least expensive and easiest of... Second of middle line as the framing square, what size lumber deck. A functional open area under your stairs n't have near the bending strength 2×12 stringer a. A 1x material to close off 2x10 or 2x12 for deck stringers riser space, consider it 's to.