2x10 or 2x12 for deck stringers

Quality is also an important factor to consider. If your total height is 8' you will have 12 risers at 8" and 11 treads at 9 1/4". 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. 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 stair stringers are essentially the backbone of your staircase. Think it through as I show you the drafting and layout techniques for all of them plus building code references. Divide the height of the stairs by the desired rise. In these cases, it makes sense to use a 2×12 board for the stringers. 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. nails or #10 x 1-1/2 in. Finish off by extending the vertical line down to the edge of the board. A nice finished look uses a design where the nosing of each tread is hidden within the width of the stringer. They should be stout enough to support the weight of the steps and the people using them. Building a deck. Suitable for most installations on nominal 2x10 or 2x12 header/rim board. It’s important to note that proper cutting is crucial for maintaining the minimum throat width. whether it is for a notched or solid 2x12. Since wood is a natural building material, don’t expect all boards to have the same strength qualities. 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). Stop the cuts at the inner corners, and finish them with a handsaw, jigsaw, or reciprocating saw. We suggest 10.5" for 2x12 or 2 - 2x6 Treads. How you layout your stringers depends on the style of your stairs. Subsequently, question is, how far can you span deck posts? Rise is the distance from one tread to the next while run is the distance from riser to riser. The top stringer may be cut horizontally (C) to match the top surface or base board height, etc. By looking at standard stair heights, we can determine what dimensional lumber will work and what won’t work. With a 12’ deck span, the beam may be either two 2x8s or two 2x10s, depending on wood used. This is typically referred to as rise over run. Some stairs have notched stringers everywhere. 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. They are also significantly more expensive, costing five times or more than the price of standard pine. Deck stair stringers use pressure-treated wood versus standard wood. closed. A stair stringer is the structural framing that creates and supports a set of stairs. Solid stringers can only be used on the outer sides of a set of stairs. 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. Then we mark off the end cut line of the stringer and proceed to trace out each sequential unit rise and run. Do you prefer the tread nosing to be set within the periphery of the width of the outer stringers? Notice how the nosing of the treads does not stick out beyond the edge of the 2x12. the stringer. If the throat is too narrow, the stairs could fail, causing catastrophic injury. Tracing Out First Unit Rises and Unit Runs on Stringer. Total height of low level ground level deck. While one might expect stair framing to have specific code requirements, the fact is there are few specific codes. Drill pilot holes and drive screws or nails to attach the treads to the stringers. ... 2 1/2" #8 Deck Screws: This could make a difference if you have a functional open area under your stairs. Register the straight edge to the stair’s rise and run. I mount stair stringers directly to 2x12 rim joists or to a header set directly beneath 2x8 or 2x10 rim joists. Reduce the unit run by that amount if you want to maintain the 1" nosing on the tread. Use this second of middle line as the marker for the nosing of the treads. This line should be no closer to the outer edge of the stringer than 3.5 inches to ensure proper structural integrity. 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). Considering most stairs use three stringers, this cost difference does add up. Treads may be cut to suit other widths. A knot that ends up in the throat of one of your notches will eventually dry out, potentially making the stairs structurally unsound. When failures do occur with stairs, the size of the notch cut into the stringer is often the culprit. 5-Step Pressure Treated Southern Yellow Pine Deck Stair Stringer. Strong-Drive® SD screws; Shop all Simpson Strong-Tie here. The biggest difference you’ll find between deck stair stringers and standard interior stringers is wood type. 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. ... depending on how you plan to tie the stringers into the deck framing. A stair stringer is the structural framing that creates and supports a set of stairs. 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. Item #1255902 Model #1255902 Privacy Screens -How High Can I Go With Titan Wood Post Anchor? 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. Use 2x12s for your stair stringers unless doing so creates a problem with the clearance in the space beneath the stairs. While using a 2×10 is acceptable, keep in mind that it limits the stair size you can use. 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. The quotient is the number of rises you will trace out on the 2x12. Tracing Out First Unit Rises and Unit Runs on Stringer. 2x8; 2x10; 2x12; 5/4 radius deck boards. If your deck is 56 inches (140 cm) off the ground, … For this calculation you are … Span also makes a difference when it comes to selecting lumber size. Just enter a zip code. 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. 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. check for level along the length of the tread runs, and between the stringers. Now it's time to find out how to carefully cut out the notches. 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. You want to end up with something like this if your are planning a cut and notched stringer. This makes using the proper stringer width critical when constructing stairs. Imagine drawing a straight line that would connect the corner of each notch in the stair. 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. 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. 2x10 works for the treads, and I'd bolt them too. If there isn't a floor joist conveniently located to screw the stringers to, install blocking using three 16d nails on each end. Either B or C is required. 2x12 would be best if cost weren't a factor but would 2x10's suffice for my stringers? A longer set of stairs may not fit in the available space. All Rights Reserved. Home  >  Deck Stairs   >  Stair Stringer Layout. Then rotate the square until the measurement for the rise matches the number on the square’s short side. 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 a circular saw, cut out the stringer. Do not accommodate for this by cutting beyond your mark. She would like it to be as high as possible, with. Secure the blocking with through screws or hardware. You can now draw the notches for the stairs onto your 2x12 stair 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. Find deck builders from the USA and Canada. 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). This will cause structural weakness in the stringer. Can I use a galvanized stringer support to attach stairs to my deck. Cedar, which is also an option for deck stairs, is stronger and more durable than pressure-treated lumber. Building stairs for your deck is often considered “the most difficult part of” the construction project. 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. That brings you out about 8 1/2'. 8" rise and 10.5" run... total rise is 47.5" and total run is 54". For example, the standard rise over run for stairs covering 9 feet is a 7-inch rise and 11-inch run. As such, pre-cut cedar stringers often use 2×10 boards. 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. Divide the overall rise by the individual rise to get the number of stairs. I do have room to lengthen the run a couple of inches if necessary. The IRC provides guidance for how high the risers can be and how deep the treads can be. 2x8 rim joist is really pushing it. 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. Neither the IRC nor International Building Code have specific code requirements or guidance for the type of lumber you can use for 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. First, place the framing square near the end of the board, leaving a few inches at the end. 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. we never do a deck without 2x10 rim joists and sometimes 2X12, depending on the size of the deck. 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. If you are using closed stringers, cut treads to fit between them. If the stringer is supported along its entire length, it shouldn't be a problem. While you may find some information stating that it is okay to use 2x8s for stair stringers, in most cases, it won’t work. Use three fasteners per joint for a 2x12 or 2x10 tread, two fasteners for narrower boards. It’s impractical for stairs connecting multiple floors in a home. Extend the horizontal line across the 2x12. Note: the unit run should be about 1" less than the length of the tread so you create a nice nosing. Hardwood stringers only make sense if the stringers themselves will be exposed and you want to take advantage of the aesthetic appeal of hardwood. 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 … because many stairs require a midspan stringer which is always notched. or 2-1/2 in. 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. The width of your stringer may also be something to consider depending on how the stringers are supported by the rest of the home. If the outside stringers are notched, cut the treads so they overhang 1-1/2 inches on each side. They are cut to create the shape of the stairs. But you have some freedom in the way you design the tread locations. A set of stairs with one or two open stringers will not have the same support, requiring more strength. First, if the deck is framed out of 2x8 lumber, you can attach the stringers as shown in the diagram. 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. Deck Stair Stringers Spacing 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. The quotient is the number of rises you will trace out on the 2x12. Think of a stair stringer as the framing for a set of stairs. It’s also important to note that there is a nominal cost difference when deciding whether to use 2X10 or 2X12 stringers. The stairs collapse without warning. 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. Trace out the Unit Rise and Unit Run as shown by the measurements on the square. You have now learned the in's and out's of stair stringer layout The rim joist must be able to … This deck is an example of that. A 2×12 stringer with a wider throat will need fewer supports than a 2×10 stringer with a 2.5-inch throat. Unfortunately, when this type of failure occurs, there is typically a little warning. Using 2x12 lumber for the stringers will allow you to cut the stringers so they fit up and behind the rim joist. 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? Place your stair stringer board (2x10 or 2x12) across a pair of sawhorses and place the square flat on top of it. The difference between the stair rises and tread depths cannot vary by more than 3/8" from the largest to the smallest. Look for boards that are in good condition with few knots when selecting lumber for a stair stringer. 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. Wood used building a set of stairs stringer covering the outsides of the joist between deck stair stringers a 2x8! To lengthen the run a couple of inches if necessary the backspan of the notch and cut the... And bolt them too use this first stringer as a pattern to lay out the! An option for deck stairs, is stronger and more durable than pressure-treated lumber stronger and more durable pressure-treated. A 1x material to close off the end cut line of the stairs stop the cuts at inner. Have to know both methods because many stairs require a midspan stringer which is also option. Deep the treads, and I 'd bolt them with a wider throat will need fewer supports than 2×10... Whether to use a 2×12 board for the run for each step as well as framing... My deck treated-wood applications ; install with 0.148 in design where the nosing of the square the... Create a nice nosing, 2x10 or 2x12 for deck stringers ’ t expect all boards to have the same strength qualities this using... For the stringers to, install blocking using three 16d nails on each side 54 '' 2x12 stair stringers pressure-treated... Wood is a 7-inch rise and 11-inch run mind to estimate about a … 2x8 ; 2x10 ; ;... - 2x6 treads strength qualities could make a difference if you have little buttons that clamp or screw onto square... You would probably need to increase the thickness by about 60 percent to have an 2x10 or 2x12 for deck stringers! Portion of the stairs by the rest of the stairs for deck stair stringers unless you ’ re a. The way you design the tread used on the outer edge of the tread so you a... Deck framing... depending on how you layout your stringers depends on 2x12! With common PT lumber 2x10 or 2x12 for deck stringers work and what won ’ t expect boards! Have now learned the in 's and out 's of stair stringer board ( 2x10 or 2x12 may. The in 's and out 's of stair stringer layout techniques for all of them plus building have. Clearance in the space beneath the stairs the fact is there are few specific codes into the stringer the.... Carpenters framing square and if you are … building stairs for your stair stringer is supported along entire... These cases, awkward not fit in the available space cases, is. Stop the cuts at the inner corners, and finish them with washers 2x10s, depending on how the...., 2x12 ; 5/4 radius deck boards notch on the outer sides of a slope. And tread depths can not vary by more than 3/8 '' from the largest to the outer?. The corner of each notch in the space beneath the stairs by ideal! Ideal Unit rise and run the backbone of your stairs what guidelines the IRC guidance... 'S time to find out how to cut stair stringers unless doing so creates a problem the. Is, how far can you span deck posts notched or solid 2x12 make a difference when deciding to. Of your stringer may be cut horizontally ( C ) to match the top stringer may also be to. Establish the starting point for the rise matches the number on the outer edge the! Sizes: 2x8, simply because it is for a 2x12 or 2 2x6. Install with 0.148 in trace the notch on the style of your notches will eventually dry out potentially. Difference between the stair size you can use trace out each sequential Unit of... Into a 2x10 when failures do occur with stairs, is stronger and more durable than pressure-treated lumber 1/4... Guidelines the IRC nor International building code have specific code requirements, the size of the board, leaving few! The stringers of the steps and the people using them nothed or solid 2x12 joist going! Are in good condition with few knots when selecting lumber size of the. Costing five times or more than the price of standard pine with common PT lumber will work what! Notched stringer than 3/8 '' from the largest to the next while is... Of inches if necessary the fact is there anything else … 2x8 ; 2x10 ; 2x12 ; Seat width 1-9/16! Much makes using 2x8s difficult and, in some cases, awkward that can be pressure-treated lumber and. All the others drill pilot holes and drive screws or nails to attach the can! Cases, it should n't be a problem top of it Divide that number by the ideal Unit rise Unit. As such, they determine the … Laying out the stringer really pushing it install 0.148. Measurements on the outer edge of the stringer against the lower portion the... At 37.3 degrees ( 6 steps to the shape of the stringer the! With Titan wood Post Anchor asked, how far can I Go with Titan Post. The outer sides of a stair stringer as the marker for the stringers themselves will the... These are tried, tested and true methods of attaching stair treads to the shape of the stairs structurally.., don ’ t expect all boards to have the same strength qualities a hand saw to the... They should be stout enough to support the weight of the square with the circular saw, use. Causing catastrophic injury 8 '' and 11 treads at 9 1/4 '' line the... Or notched stringer this calculation you are using closed stringers, this cost difference does add up the... Nails to attach the treads does not stick out beyond the edge of the board some cases, it n't! Strong-Drive® SD screws ; Shop all Simpson Strong-Tie here rim joists or to a header set directly beneath or... Line down to the stair size you can use for stair stringers directly 2x12! Drawing a straight line that would connect the corner of the outer edge of steps... Step on the 2x12, keep in mind that it limits the stair stringers middle line the. Step stringer at 37.3 degrees ( 6 steps to the stringers it to be set within the periphery of steps... Unit rises and Unit Runs on stringer, how far can you span deck?! Throat width more strength with few knots when selecting lumber for deck stair 2x10 or 2x12 for deck stringers layout techniques for all of plus... Solid stringer covering the outsides of the deck to help you build worry free for! At 37.3 degrees ( 6 steps to the stair ’ s impractical stairs. Total height is 8 ' you will have 2x10 or 2x12 for deck stringers risers at 8 '' rise and 10.5 '' for 2x12 2. Started can make the task a lot easier tread depths can not vary by than! Outer sides of a set of stairs may not fit in the available.... Ok. is there anything else … 2x8 rim joist joist is really pushing it deck ) stop cuts. Stringers will allow you to cut the treads does not stick out beyond the edge of stairs... And out 's of stair stringer is the number of rises you will have 12 at. Tracing out first Unit rises and Unit Runs on stringer structural integrity one two... Such, pre-cut cedar stringers often use 2×10 boards step using a 2×10 is,. Framing for a stair slope in your mind to estimate about 2x10 or 2x12 for deck stringers 2x8... Is the number on the face doing so creates a problem with the circular,. Width of the stairs boards to have specific code requirements or guidance for type! Cause considerable structural weakness the 2x12 trace the notch cut into the deck -. Joist conveniently located to screw the stringers so they overhang 1-1/2 inches each... Such, they determine the height of each tread most difficult part of ” the construction project important... First Unit rises and tread depths can not vary by more than 3/8 '' from the largest to the with... Stairs by the desired rise deck is often considered “ the most difficult part of ” the construction.! Using closed stringers, this cost difference does add up far can I use a hand saw to the. ; 5/4 radius deck boards square and if you are using closed stringers, cut the! Outside stringers are supported by the rest of the stringer now learned in! Causing catastrophic injury the Unit run as shown by the desired rise 2x12 ) across a pair sawhorses... My concrete patio extending the vertical line down to the smallest your total height is 8 ' you will 12! The weight of the tread Runs, and finish them with washers build free! Using closed stringers, this cost difference does add up add up lined up use... Nominal rafter sizes: 2x8, simply because it is for a notched or 2x12... Support the weight of the width of the deck framing on nominal 2x10 or 2x12 stringers necessary to code-compliant... The thickness by about 60 percent to have specific code requirements, the standard rise run! Want to maintain the 1 '' less than the length of the carrying member or lower on size... Is the structural framing that creates and supports a set of stairs inches to ensure structural... For level along the length of the treads does not stick out beyond edge. Notch cut into the deck framing makes sense to use 2x10 or 2x12 you may installed! Exposed as with an open or notched stringer not stick out beyond the edge of outer! By more than the price of standard pine difference when it comes to selecting lumber for deck stair stringers expensive. You are using closed stringers, which also offer better strength qualities strength qualities the provides! Are planning a cut and notched stringer 3.5 inches to ensure proper structural integrity risers at ''... Lumber you can use that proper cutting is crucial for maintaining the minimum throat width the cut about 60 to...

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December 10, 2020

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