how to size a stair stringer
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Designing Stairs And Laying Out Stair Stringers Draw a line to connect all the points on the stair stringers. Note that this is parallel to the nose line of the finished stairs, but is not the same as the nose line. Make another line parallel to the first line, 11.25 inches apart. This denotes the width of a 2x12, the standard material used for stair stringers.
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- 1 The stair width is recommended to be 35 inches (89cm) or longer. 2  The height of the handrail, measured from the nose of the tread, is recommended to be between 34 and 38 inches (86 to 97 cm). 3  The comfortable size of handrail diameter is between 1.25 and 2.68 inches (3.2 to 6.8 cm).
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How to Figure Stair Stringer Length There are the simple ways how to figure stair stringer length. Measure the height of the surface which will be used for the stair. Then, connect to the bottom surface of the stair will be placed. Give the note of the measuring result and calculate the stringer length and the step sizes.
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Materials Questions Can you use 2 x 12 stringers? You can use 2x12's for stringers. Mark out the stringer as you would for a cut stringer. Next, you must mark allowance lines for your tread thickness plus 3/4 and riser thickness plus 3/4 by marking lines, parallel to the cut stringer lines.ou'll need (4) 2x6's length will vary depending on your project. 2x8 risers and 2x12 treads can be used for exterior deck steps. Composite material can be used too-make sure you review our composite instructions. For interior stairs, many DIY'ers and Professionals will use _ plywood risers and treads up to 42 wide.
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Designing Stairs And Laying Out Stair Stringers Determine the thickness of stair tread material. On most decks this is simply one inch, the thickness of standard 5/4 x 6 deck boards. But... there are extra-thick deck boards available (I keep running into these darned things), and there are synthetic decking materials that can be any thickness the manufacturer wants.
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- 1 The stair width is recommended to be 35 inches (89cm) or longer. 2  The height of the handrail, measured from the nose of the tread, is recommended to be between 34 and 38 inches (86 to 97 cm).3  The comfortable size of handrail diameter is between 1.25 and 2.68 inches (3.2 to 6.8 cm). The comfortable size of handrail diameter is between 1.25 and 2.68 inches (3.2 to 6.8 cm). 2  Doors are normally not allowed to swing over steps. 3  The arc of doors should be on the landing or floor completely.
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- 1 Divide Total Rise By Maximum Riser Height-Before you can begin calculating your stair stringer layout, you'll need to measure the total rise. 2  For stairs that land on the ground, the total rise is the distance from the ground to the top of the finished floor. Divide Total Rise By Maximum Riser Height-Before you can begin calculating your stair stringer layout, you'll need to measure the total rise. 2  For stairs that land on the ground, the total rise is the distance from the ground to the top of the finished floor.
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How to Install a Precut Deck Stair Stringer 1 Socket and ratchet. 2  Stringers may be installed based on the width of the stairs or closer together where the stair treads overhand the edges of the stringers 2 or more inches.  As an added measure, install 1 1/2-inch by 36-inch framing straps at the lower edge of each stringer and the inner face of of the rim joist.
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- The first is to reduce the bottom riser height. The amount to remove from the bottom of the stringer is equal to the thickness of the treads minus the thickness of any finish flooring that is installed on the lower landing after the stringers are in place.
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- Install the treads. 1  Measure the stair treads and cut them one at a time. 2  Dry fit them first to make sure they fit precisely against both the stringers and the riser. 3  Just as in fitting the riser, you may have to scribe the tread and cut it to fit the stringers at both ends. 4  Drill holes for the nails and install them.
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How to Install a Staircase Handrail Measure the staircase from the nosing of the first stair to the floor at the bottom of the staircase. Add 12 inches to this measurement. Codes require that the railing follow the full length of stairs with either the top or bottom of the rail extending 12 inches or more beyond the staircase length.
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- 7. Determine how many stringers you will need. To prevent your steps from sagging or bowing as you step on them, a wide staircase will need plenty of stringers underneath to keep it evenly supported. For safety reasons, the stringers should be spaced between 16 inches (40.6 cm) and 4 feet (121.9 cm) apart. The rule of thumb for treads and risers is that the sum of each should equal between 16 and 18 inches (40 and 45 cm). 2  So, if your riser is 7 inches (17.8 cm) tall, your tread should be anywhere from 9 to 11 inches (23 to 28 cm) long.
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How to Measure for Stairs Use a calculator to calculate the stair riser length or the number of steps you'll need. Divide the height from the first floor to the top of the second floor by a predetermined height of your choice for the riser. The typical height of a riser is 6 or 7 inches (15 to 17.5 cm).
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- For the safety reasons and for the comfort of usage, stair measurements are recommended to follow some guidelines: 1  The run length should be 9 inches (23 cm) or longer for enough foot space. 2  The riser height should be 8.25 inches (21cm) or lower. The comfortable size of handrail diameter is between 1.25 and 2.68 inches (3.2 to 6.8 cm). 2  Doors are normally not allowed to swing over steps. 3  The arc of doors should be on the landing or floor completely.
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Laying Out Basic Stair Stringers Using 2×12 stringer stock and a 10-in. run barely leaves 5 in., and a bigger run would leave even less. After you’ve decided the rise and run, lay out the stringer with a framing square. Consistent layout is crucial. The IRC allows no more than a 3/8-in. variation in riser height or run depth over a stair.
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- Divide the total rise by the number of steps to get the actual rise per step. To continue with our example, divide 95 inches (241 cm) by 13 steps to get 7 and 5/16 inches (18.5 cm). On your stringer, each step will rise 7 and 5/16 inches.
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- 1 Adjust the height until the height and steps balance out (since you can't have a half or quarter of a step). 2  Take the number of steps and multiply that by 10.5 inches (266.7 mm). 3  That gives you the length of stair stringer necessary. 4  Take that length and project it out from the deck.d. 2. Measure the height of the stair from the bottom of the decking -- or top of the floor joist -- to the ground and then divide by the 7-to-8 inches (175-to- 200 mm). This will give you the number of steps you will need to make.
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- For the safety reasons and for the comfort of usage, stair measurements are recommended to follow some guidelines: 1  The run length should be 9 inches (23 cm) or longer for enough foot space. 2  The riser height should be 8.25 inches (21cm) or lower. The stair width is recommended to be 35 inches (89cm) or longer. 2  The height of the handrail, measured from the nose of the tread, is recommended to be between 34 and 38 inches (86 to 97 cm). 3  The comfortable size of handrail diameter is between 1.25 and 2.68 inches (3.2 to 6.8 cm).
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How to Calculate Stair Stringer Length Divide the height of the staircase in inches by the intended rise of each step, also in inches, to assist in determining the stair stringer length. The riser height is up to you, though most building codes will not allow a height larger than 7 3/4 inches.
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How to Plan Stairs Divide this by a typical riser height, such as 8 inches, to get an idea of a reasonable number of steps. For example, a total rise of 102 inches divided by 8 inches equals 12.75 stairs. All steps must have the same dimensions, so round up to the nearest whole number.ultiply the 12 treads by the minimum tread depth of 9 inches to arrive at 108 inches for the staircase run. Add nosing and riser thickness of 2 1/4 inches to achieve a total run of 110 1/4 inches.
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How to Build Deck or Porch Stairs 9 Steps show how to layout & cut the stair stringer, frame the landing, attach the stringer, attach risers & treads To cut good stair stringers, you need a pair of stair gauges (photo at left) and a framing square (photo below left) to which the stair gauges are attached to hold a constant rise and run dimension. You can find these standard tools at any well-stocked home improvement store or lumberyard.sing a pre-cut stringer or a pre-built set of stairs works well IF the total stair rise at your job is equal to or a bit greater than the total stair rise afforded by the stringer or stair set, IF you can correct the difference by the height or thickness of the stair bottom landing.
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How to Lay Out Stair Stringers for a Deck To make the most of your deck, avoid large steps up from the ground to the wood. Instead, add steps that the oldest and youngest can easily climb. Aim for steps with a rise -- the distance you step up -- of about 7 inches and a run -- the depth of the step, from toe to heel -- of around 10 inches.
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How wide do the stringers have to be, when building a staircase? Best Answer: the best thing u can do is contact city hall.they will be able to tell u what the minimum and the maximum depth of ur treads should be. where i live it is no less than 9 1/4 inches in depth,and no taller than 8 1/4 inches from top of tread to top of tread. it is hard to tell u on here how to make the cuts in order to make ur stringers. e-mail me and i will help u out as much as possible. Source(s): home builder for 12 years.
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- This measurement will determine how long the stair lift rail needs to be. Measure from the landing edge of the top stair to the floor at the bottom, in a diagonal line. Width. Measure this at several points along the staircase, as it might vary slightly. Use the narrowest width as your measurement.
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How to Install Wood Stairs Mark a line from bottom to top. With 1 person on the floor, and another on a ladder, use a pencil with a straight edge or chalk line to mark a diagonal line for the stringer. The stringer is the part of the stairs that the steps, or threads, and risers will be attached.