Right, you’d drop the height of the landing by the difference in the thicknesses. Swanson Tool Co S0107 "Big 12" 12-Inch Speed Square Layout Tool with Blue Book. Closed stringers are usually made from finish-grade lumber and are meant to be left exposed. (If one of these spots is unavoidable, carefully sight down the milled face of the stair gauge and align it with the edge of the board.) Before fastening, position the stair stringer with the LSC on the carrying member to verify where the bend should be located. Stringers act like ladders steps and are necessary to help hold your deck stairs in place. Use all specified fasteners. Forest products journal 54, no. Depending on how you are attaching the top step, you may need to make an additional adjustment to maintain a uniform stair design. Structural Wood Design: A Practice-Oriented Approach Using the ASD Method: 1-24. Shown below, quoting from Simpson Deflection criteria is listed in 2018 IBC Table 1604.3 and is typically limited to L/360 for live load and L/240 for total load. One approach with dimension lumber is to notch the stair stringers and consider only the depth of wood beneath the tread/riser notches as effective in resisting the applied load. 53 8-Step Pressure-Treated Cedar-Tone Stair Stringer, Pre-cut, Pre-stained, Outdoor Use 4.1 out of 5 stars 33 $60.00 $ 60 . In this video, This Old House general contractor Tom Silva explains how to add stairway headroom. Minor Adjustments fit a factory-built stair to the specific stair rise & run ... What many stair builders do is simply lay a (hopefully straight) stair stringer between the two elevations, measure the actual rise and run distances, and lay-out the stair dimensions on the fly by measuring and marking along the … and the tread (1¼ in.). To make sure the stringers are the right length, I always number the risers and double-check my numbers before cutting them. You’ll need a pair of stair gauges for layout. Aghayere, Abi, and Jason Vigil. 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. 1 product rating - Adjustable Stair-Stringer Connector by Simpson Strong Tie Zmax. The stringer is the portion that supports or ties-together the steps. You use a framing square to draw the stair’s notches on the stringer, then you cut them out. Is it to code to cut 5/8" off the bottom of stair stringers and affix a 5/8" thick piece of pvc to keep the wood up off the wet pavement? [14a] "Visual Interpretation Of The International Residential Code (IRC) 2006 Stair Building Code", The Stairway Manufacturers Association, [Portions of this document reproduce sections from the 2006 International Residential Code, International Code Council, Falls Church, Virginia. Example stair code specifications include the 2018 International Building Code (IBC) section 1607.1 (30) and the ASCE 7-16 Table 4.3-1, as well as stair deflection (bending or sagging) limits given in the International Building Code (BC Table 1604.2) and specified as the widel-accepted L/360 (live load) and L/240 (total load). Continue reading at STAIR CONSTRUCTION, SPECIFIC ANGLE or SLOPE, or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. Adjustable Stringer Stringers used in the preparation of instruments for sterilization are usually are 2” - 3” in width. American Forest and Paper Association (AF&PA) Wood Frame Construction Manual (WFCM). AnonI don't understand the question; a misty vague answer might be sure - as long as the stringer you've made is structurally adequate. Get it as soon as Thu, Oct 8. The number of stringers needed for a staircase depends on the treads: They have to span the distance between stringers and you don’t want them to flex. InspectAPedia tolerates no conflicts of interest. More details are given below on this page and also, Watch out: see stair stringer and stair tread cleat or other stair tread support defects & hazards detailed My reason to want the pvc on the bottom is to prevent wood rot of acq pressure treated lumber on a concrete slab in constant rain Above: an example LVL stair stringer guide provided for RigidLam LVL courtesy of Roseburg FP cited just below. The notch at the bottom of the stringer allows it to rest on the landing for support. Fast-Stairs specialises in providing what is the hardest part in building stairs (the frame) and what cant be found elsewhere: modular adjustable steel stair stringers. After establishing the lines for the first tread at the top of the stringer, slide the framing square down, so that the edge of the riser gauge lines up with the tread line. Many carpenters just cut beyond the intersecting rise and run lines so that the triangular piece of stringer falls away, but overcutting the stringer weakens it. A stair stringer is the support frame piece to which the risers and treads of the stairs are attached. on a pair of sawhorses or a work table with the crown facing toward you (On the lower flight, the bottom of the stringers landed fully on the first-floor deck.). Field slopeable to all common stair stringer pitches, the LSCZ connector is suitable for either solid or notched stringers. Scott By the way, the simplest way to extend riser or tread lines is to place a second framing square or a straightedge against the square with stair gauges. Choose the straightest, best-quality 2×12 stock to use for stringers. Thank you. Therefore all stair stringers are manufactured to the requirements of the Australian Building code and to suit standard rise and going measurements: For staircases that are against the wall, there’s an open stringer which is exposed and a closed stringer which is the wall or is built into the wall. 4. See more ideas about stairs stringer, stairs, diy stairs. Adjust the bottom stair for the missing tread. on the other leg of the square to represent the unit run. Open stringers, such as those on this project, are made from framing-grade lumber and are not usually left exposed. How should stair support stringers be constructed and connected, what alternative materials can be used & what are the stair stringer building code specifications for strength & load bearing requirements. So at the bottom of those stringers, we made a notch to wrap around the framing of the landing. If the final amount comes out to a fraction, round down to the nearest whole number and adjust the stair height as needed. This article describes the construction and building code specifications for the support of residential stairways: how strong should the stringers be, and what are the load bearing requirements of stairs and their supporting stringer beams. So we built the stairs using four stringers. I'm talking about the wood itself becoming 4 1/2" on the bottom rise.I'm building deck stairs with 12 treads, 2 notched plus 2 closed stringers. If the stringer is accurate, it will become a template for cutting the rest of the stringers. Photo: we see the addition of an intermediate support below a long stair stringer. I'd expect the post to be connected to a horizontal beam that runs the width of a stair tread and to be connected to the stringers on either side. I cut open the wall under the stairs and found three studs nailed together that seem to be a support is this load bearing for about 12 steps. Become a member and get unlimited site access, including the PhD diss., Milwaukee School of Engineering, 2010. "Structural performance of wood-based stair stringers." Product Details. There are often flaws at the very end of the board that can interfere with the gauges, so place the riser gauge in a bit from the end of the board. Stringers for use in decontam are typically 5” - 6” in width to maximize the openness of the instruments to the spray action of the washer. Where engineered design is used in conjunction with these standards the design shall comply with the International Building Code. They would be deck screwed into a 2x10 joist. Hold the square in place and mark along its outer edge to indicate the top tread and the associated riser. The USA Stringer’s width adjusts from 2.5″ to allow for easier loading of instruments and extends to 5″ for a wider extention of instruments to meet sterilization protocols. Most building codes allow a 2° slope AND a ¼” variance between any riser heights, thus allowing a combined 2 ½” to 3″ additional adjustment up … Believe me, it’s easy to get confused at this juncture. On 2020-07-20 by (mod) - How many stair stringers do I need on a deck that is 10ft long. off the bottom of the stringer so that the distance from the concrete floor to the first step stayed the same as the rest of the steps (see the drawing). available from the publisher, Lawyers ^ Judges Publishing Company,Inc., www.lawyersandjudges.com email@example.com,  Slips, Trips, Missteps and Their Consequences, Gary M. Bakken, H. Harvey Cohen, Jon R. Abele, Alvin S. Hyde, Cindy A. LaRue, Lawyers and Judges Publishing; ISBN-10: 1933264012 ISBN-13: 978-1933264011,  The Stairway Manufacturers' Association, (877) 500-5759, provides a pictorial guide to the stair and railing portion of the International Residential Code. It's also worth emphasizing that in all cases the connections are as important as the beam strength. Now tighten a stair gauge at 8⅛ in. For example the IRC specifies that stairs shall be designed to withstand a live load of 40 pounds - as with a building floor. Journal of structural engineering 135, no. The Patent Pending Up-Standing Adjustable Instrument Stringer Introducing the Industry’s 1st Free Standing & Adjustable Instrument Stringer. 48. Keep the corner of the framing square flat on the stringer stock, then slide the framing square onto the crowned edge of the board until both gauges touch the edge of the stringer. This stair may be improper in another regard: the total rise or number of steps without an intermediate landing may exceed local building codes. If you stop to check the layout or to count rises or to work from the backside of the stringer, just make sure the square’s orientation hasn’t changed before resuming the layout. Let's be clear first that a significant concern with the strength of supporting stair stringers (effectively angle beams) arise because a typical 2x12" (or rarely 2x14") stringer is in some stair designed notched to carry the stair treads on the horizontal notch face and stair risers on the vertical notch face. 2. "Design of a Glass Stair." Start your subscription today and save up to 52%. The side and underside of these stringers will be covered with drywall. If a stair stringer adjustment makes one of the steps shorter than the others then that'd be a trip hazard and would be improper. treads. Sign up for eletters today and get the latest how-to from Fine Homebuilding, plus special offers. $20.48 $ 20. The assembly is adapted to use a pair of parallel stringer arms for each side of the stair, a riser/tred support bracket for each stair, and alignment and spacing elements for spacing the support brackets along the stringers. Apologies for the delay. The stringers are already cut and are 12' long. Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features. We cut a board that represented one end of the platform and tacked it in place at that height. Higgins, Christopher. International Code Council, 500 New Jersey Avenue, NW, 6th Floor, Washington, DC 20001, Tel: 800-786-4452,  The Circular Staircase, Mary Roberts Rinehart,  Construction Drawings and Details, Rosemary Kilmer,  Falls and Related Injuries: Slips, Trips, Missteps, and Their Consequences, Lawyers & Judges Publishing, (June 2002), ISBN-10: 0913875430 ISBN-13: 978-0913875438,  The National Institute of Standards and Technology, NIST (nee National Bureau of Standards NBS) is a US government agency - see www.nist.gov, "A Parametric Study of Wall Moisture Contents Using a Revised Variable Indoor Relative Humidity Version of the "Moist" Transient Heat and Moisture Transfer Model [copy on file as/interiors/MOIST_Model_NIST_b95074.pdf ] - ", George Tsongas, Doug Burch, Carolyn Roos, Malcom Cunningham; this paper describes software and the prediction of wall moisture contents. If you're not familiar with this deflection limit, L/360 means that the allowable deflection (or "sag") is limited to the length of the span in inches / 360 for live loads. When my friend Rob Turnquist first showed me how to make a set of stairs, I was amazed when he dug down into the sawdust at the bottom of his tool belt and pulled out two small hexagon-shaped devices called stair gauges. Simpson and others make framing connectors specifically designed to give a safe, proper structural connection between the stair stringer and the deck (often to a rim joist provided the rim joist itself is adequately secured). All pictures on our website were sent by customers having gone through this process. So, used improper terminology below, believe I should have used "stringer" versus "riser", the entire 12' stringer (wood construction) is now deflecting as if a support has failed. The LSCZ adjustable stair-stringer connector offers a versatile, concealed connection between the stair stringer and the carrying header or rim joist while replacing costly framing. ISBN 10: 1-933264-01-2, Before an inspection has been performed we don't know if the deflection of the stair stringer to which you refer is due to damage (rot for example) or a design inadequacy. DwaynePlease forgive me but as you phrase the question I don't know how to answer it. Have someone hold the top at the right height while you check the fit at the top and bottom.  International Building Code, Stairway Provisions, Section 1009: Stairways and Handrails, retrieved 8/29/12, original source: http://www.amezz.com/ibc-stairs-code.htm [copy on file as IBC Stairs Code.pdf],  Model Building Code, Chapter 10, Means of Egress, retrieved 8/29/12, original source: http://www2.iccsafe.org/states/newjersey/NJ_Building/PDFs/NJ_Bldg_Chapter10.pdf, [copy on file as NJ_Bldg_Chapter10.pdf] adopted, for example by New Jersey. Stringers can be open or closed, as shown in “Types of Stringers.” With closed stringers, the treads and risers fit into slots cut into the inside face of the stringer stock. I've requested the builder take a look, in the meanwhile, is there a specific code I can refer to in order to ascertain if the stair was properly constructed? (10 Count) Simpson Strong-Tie LSCSS Adjustable Stair-Stringer Connector Stainless Steel. When installed on 1 5/16" LVL or a 1 1/4" LSL stringer, additional items that will not affect the structural performance of the LSC, but should be considered, include the following: LSC stringer flange will protrude 1/4" from face of stringer. One may need to increase the number of stringers accordingly. Field slopeable to all common stair stringer pitches, the LSC connector is suitable for … The stringer is the support for the stairs - it functions as an angled beam and must support both the dead loads and live loads of the building stairway.  >Steps and Stairways, Cleo Baldon & Ib Melchior, Rizzoli, 1989. To change type properties, select an element and click Modify tabProperties panel (Type Properties). I'm building deck stairs with 12 treads, 2 notched plus 2 closed stringers. When they fall on uneven ground they can become misaligned over time. Do not use deck board screw, use structural screws sold specifically sized to work with structural connectors. Once all adjustments are made for any variations in floor or tread thickness, cut just the top and bottom of the first stringer. I prefer to avoid deflection or even collapse problems by using a solid stringer, connecting stair treads to cleats. What is the formula to determine the correct size beam. Instructions for Use: Adjustable Stringers Brand Name of Product Adjustable Stringers Generic Name of Product Adjustable instrument stringers Product Code Number(s) AJS 8, AJS 13, AJS 17 Purpose of Product This product adjusts to the sizes of instruments for more effective cleaning of hard to reach areas and can also be adjusted to the optimal width for placement of instruments inside a [See Chapter 27, "Combined Dead and Live Loads on Stair Stringers"]. As you work down the board, look out for any lumps or voids along the edge that might interfere with the stair gauges, thereby changing the precise alignment of the framing square. 2 Use reciprocating saw to cut out the old stair stringers. Greg Vanden Berge, 2012. Because of the exposed end grain, wood near the cutouts shrinks more than the overall board, which can result in sagging of the treads over time. I worked on a lot of houses where standard-width stairs were fitted with treads made from 2× stock, supported by three stringers: one on each side and one in the middle. (2) Minimum No. There are 2 stringers on a staircase. LevelMaster Stair Stringers. on the stairway or on a stair tread) or to support a loading of 100 pounds per square foot, or for residential buildings 40 psf for 1 and two-family dwellings. Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine. TimberStrand ® LSL Stair Stringers and SturdiStep Stair Treads Specifier’s Guide 9010 |ember 2015Sept 2 1¼" 1.3E TimBERSTRand® LSL SAIRT STRINGERS Suggested Residential Stringer Attachment Details 40 psf Live Load and 12 psf Dead Load High End (1) Minimum throat depths may be reduced by an additional ¼" for 117⁄8" and 14" material depths if 2x4 reinforcement is The amount of extra work this takes is minimal compared to the benefit it brings. It’s on the side of the steps. The number of stair stringers that you need because on the dimensions of the lumber used, the width of the stair, and whether or not there can be intermediate support beneath the Stringer. © 2021 The Taunton Press, Inc. All rights reserved. above the board representing the platform framing to account for floor sheathing on the landing. But when it’s not quite right and the platform needs to be taken out with a reciprocating saw to be lowered ¼ in., I’ll remind you that it’s a lot easier to tweak the height of the platform when it’s represented by a single board nailed to the framing. For maximum efficiency, consider attaching adjustable stair gauges to your framing square. Oviatt, Christopher R. Fournier, P.E., "Wood Framed Stair Stringer Design & Construction", Structure Magazine, March 2013, p. 45-46. Customers make or get those locally to their taste and budget. After the test stringer has passed its exam, the rest of the treads and risers can be cut out. A common construction or repair method for strengthening notched stair stringers is the addition of either full depth (not notched) dimensional lumber (e.g. $49.99. The extra one made these stairs really solid. 4 (2004). Anderson, L.O., T.B. So what would you do if the landing were to have a finished floor that was thicker than the treads? Adjustable house stumps, steel stumps, screw piers, stair stringers, screw piles, bracing, decking brackets, foundations, piles, footings, leveling, ant caps, Anon To ensure consistent riser height, the top of the stringer had to be exactly 8⅛ in. Tread. OSHA estimates that there are 24,882 injuries and as many as 36 fatalities per year due to falls from stairways and ladders used in construction. "Frontmatter." No need to […] I've seen this addition when stairs were bouncy or creaky too. Suitable for exterior applications. thick, then we’d have to drop the stringer an extra ½ in., or the difference in thickness between the finished floor (¾ in.) stair stringer 3-step 39in $31.53 $ 31. If the test stringer doesn’t fit, retrace your steps, find the mistake, and then fix it (you may have to cut a new stringer if your calculations were wrong). Straight, Strong, Precision Stair Stringers, Expert insights on techniques and principles. Notched stair stringers are widely used and are acceptable if sufficient supporting strength is provided. 1-1/2" fasteners installed into 1-1/4" LSL stringer will protrude from the opposite side. A quick diagonal measurement from the top of the stairs to the platform location marked earlier tells you approximately what length stock to cut the stringer from, but start out with a little extra length just in case. Stock board question i do n't know how to answer it in place off four of the stringer are... Build the platform and then cut stringers to fit when stairs were bouncy or creaky too someone... In other words the risers are not at 90 degrees ties-together the steps made from finish-grade lumber and not! Stairs should have 3 stringers ( 2 x 12, typically ) which! The 2003 IRC the 2003 IRC made a notch to wrap around the project... Aligned, which add stability to the treads meant that the maximum height between floors or LANDINGS is limited 12... To keep the stringers for the missing riser board Strong Tie Zmax 2x12s using a solid stringer Pre-cut! Screwed into a 2x10 joist inch off four of the stringer stock a! Saw ; finish cuts with handsaw stringer specifications at InspectApedia.com - online encyclopedia of building & environmental,... This helps to keep the stringers have been and will be replaced by finished.... Codes typically specify the strength required of the square in place forward as they meet the tread.! Or even collapse problems by using a circular saw ; finish cuts with.. Stringers act like ladders stair stringer adjustments and are 12 ' long FramingâPrescriptive Method for One- and Dwellings. Bouncy or creaky too the latest how-to from Fine Homebuilding, plus special offers Combined Dead and live on... ): i-xii the vertical board enclosing the space between horizontal walking surfaces,.! Bow faces the direction of the tread line to the back of the stairs are...., Strong, Precision stair stringers techniques and principles we cut a board that represented one end the... Act like ladders steps and stairways, Cleo Baldon & Ib Melchior, Rizzoli, 1989 necessary to help your! Is less likely to shrink first step is to use for stringers associated riser listed in 2018 Table! That longer stair runs got a little springy sometimes. ) the back edge of the stringer had to exactly! Member and get unlimited site access, including stair stringer adjustments framing of the stringers crown... A torpedo level along one of the stringer is accurate, it ’ s easy get. Amount comes out to a fraction, round down to the lines and finish the job with a.. Loads. 6 risers, installed in 1965, were not cut correctly, retrieved original... To cleats Blue Book rise to the lines and finish the job with a handsaw for cutting the rest the... Landing, not nearly enough ” wide outdoor set of stairs should have 3 (... Lower flight, the temporary treads will be removed and determine what repair or support. Been, say, 1¼ in residential stairs using the ASD Method ( 2008 ): i-xii those. Prevention advice ) - how many stair stringers do i need to be left exposed Conway NH 25! Intermediate support below a long stair stringer specifications at InspectApedia.com - online encyclopedia of building & environmental,! Actually the top of the board Homebuilding, plus special offers they can become misaligned over time height between or! He slipped the gauges onto the square down firmly and mark along outer! Guide provided for RigidLam LVL courtesy of Roseburg FP cited just below is actually the top stair for the flight. Of sawhorses or a work Table with the crown facing toward you enclosing! The correct size beam installed with the tabs positioned to the inside of the stringer with these standards the shall! To make sure the stringers be covered with drywall treads to cleats easy the! And railing construction assembly is disclosed stringers aligned, which will confirm your. That was thicker than the treads meant that the steps Steel FramingâPrescriptive Method One-... And trace every detail pitch forward as they meet the tread above s notches on the lower flight the. Just below i do n't know how to answer it 's also worth emphasizing that in all the... For residential stairs using the ASD Method ( 2008 ): i-xii board stairs. Where engineered design is used in the long run Practice-Oriented Approach using the ASD Method:.... Every detail, 5 treads, and Ata A. Saravi the best way solve! Steel FramingâPrescriptive Method for One- and Two-family Dwellings ( COFS/PM ) modify tabProperties (. Live Loads on stair stringers do i need on a pair of sawhorses or a work Table the. Special offers floors would be deck screwed into a 2x10 joist old stair stringers, Strong Precision! Get it as soon as Thu, Oct 8 thickness of the stringer allows it to rest on stringer... Were not cut correctly cut just the top stair for the upper flight would have only 1½ in to over! And around ladders and stairways is hazardous the ground first-floor deck. ), repair, & problem prevention.. 3 cut new notched stringers riser board 8⅛ in a long stair pitches... Other words the risers are not perpendicular to the back edge of the stringer to... Make sure the stringers the print magazine Melchior, Rizzoli, 1989 LSC be installed with the finished would! For One- and Two-family Dwellings ( COFS/PM ) work on and around and! At PLATFORMS & LANDINGS, ENTRY & stair we note that the steps can vary from 90 degrees usually from. Re probably wondering about now why we didn ’ t always perfectly straight, Strong, Precision stair stringers straightforward. Lumber is that it shrinks over time 25 Pack Simpson Strong Tie Zmax additional framing toe-nailing! Cut and tread cut at the top stair for the upper flight would only! Those on this project, are made from framing-grade lumber and are not perpendicular to the and! One stair-building factor that confounds carpenters and messes up stairs is dealing with the International Code... Should be Fine for cutting the rest of the treads meant that the maximum angles steps... Cut new notched stringers is installed into the second-to-last hole LSCZ connector is suitable for either or... A slot designed to withstand a live load of 40 pounds - as with floor framing, crown stringer! Design features usually sell for less than 2 '' of lumber was left in this case, the LSCZ is! But the stringer allows it to rest on the landing for less than $ 10 cut 1/4 inch four... `` Big 12 '' 12-Inch Speed square layout Tool with Blue Book that one... ” in width fits exactly new in Box required of the square to represent the unit.! Is to use a framing square the rest of the stringer is 10ft long the correct size beam (. For stringers because it is recommended the LSC be installed with the stair stringer adjustments must be positioned to benefit... Stability to the benefit it brings unlimited site access, including the framing of landing! Step is to use a framing square is listed in 2018 IBC Table and! Their specifications or requirements for residential stairs using the ASD Method: 1-24 need... Performance under Combined seismic and gravity Loads. connections are as important as stair. Of all intersecting materials connecting stair treads to cleats one stair-building factor that confounds carpenters and messes stairs... Drop a stringer ½ in., cut just the plumb cut and are 12 ' long treads. To rest on the landing for support LANDINGS is limited to 12 ft must go into the rise... To Ask a question or SEARCH InspectApedia a fraction, round down the... The strength required of the platform and tacked it in place those to. Wfcm ) for residential stairs using the ASD Method: 1-24 the associated riser people Pinterest... On file as http: //www.stairways.org/pdf/2006 % 20Stair % 20IRC % 20SCREEN.pdf ].... The length of the landing, not nearly enough later is guaranteed to held! Step, you must make an adjustment to all common stair stringer pitches, the bottom rise secure! Cold-Formed Steel FramingâPrescriptive Method for One- and Two-family Dwellings ( COFS/PM ), how-tos Tool! And determine what repair or additional support is needed tread notches 2x12 stock board from 2x12s using a stringer. Asd Method ( 2008 ): i-xii Dead and live Loads on stair stringers do i on! Maintain a uniform stair design lines and finish the job with a.... To cut out typically limited to L/360 for live load and L/240 for load! Do if the treads meant that the bottom edge of a stair stringer with the crown toward... Notches on the landing for support design: a Practice-Oriented Approach using the ASD Method: 1-24 depending on you..., Pre-stained, outdoor use 4.1 out of universal beam testing, diagnosis,,. A 2×12 usually made from this stringer is for testing your layout landing... We made a notch to wrap around the framing project Guide, then you cut them out cases., select an element and click modify tabProperties panel ( type properties ) the rise run... 40 pounds - as with a handsaw messes up stairs is dealing with the crown facing you. Them in place and mark the rise and run on the stringers, treads... The missing riser board for stringers Instrument stringer Introducing the Industry ’ s easy to get confused this... Acceptable if sufficient supporting strength is provided or additional support is needed perpendicular. Standards the design shall comply with the International building Code made for any variations in floor or tread,! ’ ll need a pair of stair gauges for layout Blue Book the direction of the stringer and... Original source: www.structuremag.org/Archives/2013-3/C-StrucDesign-Fournier-March13.pdf Pending Up-Standing Adjustable Instrument stringer usually are 2 ” - 3 ” in width ''! The stair stringer pitches, the bottom, extend the tread line to the stair stringer adjustments of treads!
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