Exterior Stairs Tread and Riser Ratio Place a level straight out from the deck and measure to the ground or landing using a tape measure. Should we get to that point, we'd first have to deal with the full flight of stairs up to the bedrooms and bathrooms! Alexandria Moulding 3/4-inch x 10 1/8-inch x 42-inch Oak Stair Tread Cap & Riser Kit (11)-Compare. Opens Easy with One Flip. 4.9.2 Treads and Risers. 6 ½ in. Connelly had thought about getting a ramp, but decided the steps would better suit her needs. They’re absolutely terrific!” she told InMotion. 127" of additional run distance / 3 platforms = 42.3 inches in length (or "depth) in the direction of travel on the stairs. There are a few calculations that can help determine whether a stairway's rise and run will feel comfortable during use. Well, if youre lacking out on this brilliant gift of nature, it is virtually your terrible luck. Watch out: in reducing the step riser height if you produce a tread depth distance that makes walking awkward or "halting" the result may be an increase risk of stair falls. I'd like to propose an alternative design that increases the number of stair steps, uses a smaller rise, and adds some longer walking platforms to avoid what I call those "halting walk stairs" that we often see. Then to obtain the tread depth, in this sample calculation, use the formula for the recommended riser-tread proportioning, 2(4.875) + T = 26” to 27”, T (tread depth) would equal 16.25” to 17.25”. Besides having a uniform riser height and comfortable proportioning, there are other things you can do to help increase the safety of your steps. Alternative … In our photo you can see an implementation of a stairway on a very low slope rise at the Mohammed V. Mosque in Casablanca, Morocco. This staircase of mine is built outdoors at grade and being at a low-angle the usual staircase design rules don’t fit here. For example if we eliminate three of our 4" rise steps then that (3 x 4"=12) 12-inches of rise has to be spread over the remaining (19 - 3 = 16) sixteen steps. It is not the physical height of the riser because this excludes the thickness of the tread. a1Jim. 62. There are many possible ways to cut this up into individual steps; the question is what tread dimensions will allow me to use normal footsteps and avoid the awkward half-steps, especially after the rise is put into the mix. Or you could change the number of steps and platforms around to suit the terrain by making new calculations using my example.There are two approaches I've seen to the low rise step problem. Stairs have uniform riser heights and tread depths between landings; 1910.25(b)(4) Stairway landings and platforms are at least the width of the stair and at least 30 inches (76 cm) in depth, as measured in the direction of travel; 1910.25(b)(5) When a door or a gate opens directly on a stairway, a platform is provided, and the swing of the door or gate does not reduce the platform's effective usable depth to: … Step tread + (2 × riser) = 26 or 27. 4 ½ in. Please see the accompanying drawing and comment. In the absence of a better term, we've coined halting walk stairs to describe a (usually low slope or shallow angle) stairway whose individual tread depth is deeper than common, too deep for passage by a single stride or step, but too shallow to provide a comfortable two or more stride or step progress up or down the stairway. The large level step tread allows easy walker use, and the risers short height makes stepping up and down easier than standard steps. - PDF Document from NIS, [12] Slips, Trips, Missteps and Their Consequences, Second Edition, Gary M. Bakken, H. Harvey Cohen,A. There are other ways to solve this problem depending on terrain, I've just picked this one. Love is inside the air and butterflies are resting at the freshly bloomed flowers. 78" total rise / 16 steps = 4.875" riser height or if we eliminate 5 steps (19-5 = 14) we are back at 78" / 14 = 5/57" rise per step - which was your proposal. The building process for these steps is very similar to the process to build ramps, described on pages 29 through 34 of this manual. 5 ½ in. (if the stairs are properly designed and built this extra risk is probably too small to quantify.). Encountering a step that is significantly different in height, width or depth than other steps on a stairway may upset the user’s balance, causing a fall. It is not the physical height of the riser because this excludes the thickness of the tread. Sep 25, 2017 - ARTICLE: Long-tread, Low-riser steps instead of ramps - For many legs on each tread. ), [39] "How Slippery Is It", retrieved 8/29/12, original source http://www.icebike.org/Articles/howslippery.htm, [41] Frictional Coefficients of some Common Materials and Materials Combinations, The Engineering Toolbox, retrieved 8/29/2012, original source: http://www.engineeringtoolbox.com/friction-coefficients-d_778.html [copy on file as Friction and Coefficients of Friction.pdf ], [43] 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], [44] 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. Set a long level or straight 2 x 4 on top of the decking, and measure the height at the point where you want your steps to end. I put it in the lowest set of steps in the plan (see sketch above) on the (OPINION) theory that longer runs of steps present a greater risk of falling - so let's put the greater risk of a fall closest to the end of the stairwell where the extent of a fall would be minimized. How do we get there while keeping stair riser height within standard recommendations? Each stair tread is 11 inches (280 mm) deep minimum with a sloped riser. 160 posts in 4104 days . tread and that the intended user will be able to use this type of step. For this illustration we'll take the easy way out and make the platforms long enough (they are allowed to be longer than 36") to use up that missing 127" by simply dividing 127 by 3. for pricing and availability. We have to solve this problem by finding a balance between the number of individual steps (at some width for which we started with 11" depth). Find treads & risers at Lowe's today. Item #1417908. For example, a 6" riser and 12" tread would be comfortable, according to the above math. Find the right tread and riser for your situation by pluging your measurements into this formula: Step tread + (2 × riser) = 26 or 27 Or use the handy chart below with the ratios already figured for you. You may also be interested in: Precast Concrete 4 Ft Step $65.00. Model #7103005016. STEP: – It is a portion of the stair which provides upward or downloads movement.A stair is composed of a set of steps. International Code Council, 500 New Jersey Avenue, NW, 6th Floor, Washington, DC 20001, Tel: 800-786-4452, [45] "Right Triangle Angle And Side Calculator", csgnetwork, retrieved 9/29/12, original source: http://www.csgnetwork.com/righttricalc.html - ... subtract the thickness of a tread from the rise and mark a line … LONG TREAD, LOW-RISER STEPS ARE NOT APPROPRIATE FOR INDEPENDENT USE BY A 15 in. Include the nosing of the tread in your measurement. Treads - the Tread Depth [B] should not be less than 10 inches (254 mm). AS CLOSE TO EQUAL IN HEIGHT AS POSSIBLE. Low rise stairs are very expensive in terms of the space consumed. Open Riser Stair Tread with cast-in textured non-skid finish. Simpson Strong-Tie 2-Step Steel Deck Stair Stringer. Divide the vertical drop by the riser height you need. called for in the engineering documents for the long-tread low-riser steps. Either of these strides can result in an awkward placement of the foot, possibly not securely behind the tread nose, and in our opinion these stairways have an increased risk of trips and falls. Greater variations in riser height are serious trip and fall hazards. To meet the rise and run specified in this example, in one option we can build a stair that includes. Once we make low slope (low angle) stairway treads deep enough (longer in your parlance) to avoid the halting walk problem I'm not sure there is a perfect tread depth for the reason you noted as well - horizontal stride varies enormously among individuals, especially when we add consideration for children, disabled or elderly (CDE my term) users. 7/26/90 is very often cited by other sources for good design of stairs and ramps etc. One can therefore build a stairway with multiple successive deep (long, multiple-stride) steps and treads (your thought-out design) or if it fits the required run distance, some may like my design of a stair with multiple runs of more standard individual treads (of more typical rise and depth) separated by one or more long (deep) platforms to add the total run length needed for a low slope stairway. Continue reading at STAIR RISER SPECIFICATIONS or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. Add the Risers and DIY Stair Treads. PERSON USING A WHEELCHAIR AND ARE NO INTENDED TO REPLACE PROPERLY DESIGNED RAMPS. Available Options: SIZE: Matrix dimension. The nosing is not a separate piece of wood; it is the short extension of the tread that hangs over the riser. At the site you have chosen measure the vertical drop from the top landing by the door to ground level. High Riser Step with Handle for Easy Transport. The calculations for the example staircase result in a 7 7/8-inch riser with 13 risers, 12 treads, a tread depth of 9 inches and a staircase that is 110 1/4 inches long. The steps above look like 4 or 4/12 to 11. Stair Design Tip: Actually if I were building these outdoor stairs I'd probably change the topmost step in our sketch below also a 4th platform, not adding any more rise but set into the ground at grade level to provide a stair entry platform - it really depends on what the stairs are rising "to" - grass, existing sidewalk, or what?