Content Updated on: October 11, 2019 by Carpenter
When designing Straight staircase, Quarter Landing Stairs, or Half Landing Stairs we cope with directly flights and generally speaking it’s not tough to create a calculation of setup, as well as of the arrangement of measures in the flight.
Example Calculation for Stairs with a Straight Flight
Let’s describe the calculation procedure for the staircase with a straight flight for instance.
Suppose we construct a staircase from the floor to the second floor. Floor to Floor Height is equivalent to 2600 millimeter . Consequently we would like to obtain the staircase with significance of the riser height and moving 17/29 (you may read how pick a correlation of the riser height and moving from the area How to build stairs). To estimate the amount of risers, we should split the Floor to Floor Height from the riser height, that we take from the significance of the riser height and moving 2600 millimeter ÷ 170 mm = 15.29. Since the amount of risers will be a lot, we round down the value obtained and get 15 risers. Now to find out the precise value of the riser height, we will split the Floor to Floor Height from the amount of risers, that’s 2,600 millimeter ÷ 15 = 173.33 millimeter . We must round down the value received to 173 millimeter , as it’s not possible to measure out the value of 173.33 millimeter by hand marking.
But today if we multiple 173 millimeter by 15 risers we get the value of 2,595 mm. As you’ve already understood, the precision in dimension is of crucial significance . Ignoring even tenths following the decimal point at the same step leads from the aggregate to the gap between the Floor to Floor Height and the staircase elevation. In the case set above the value of 5 millimeter can be paid if you marginally level up the stairs, or when you increase the height of the last riser. However, the best thing is to avoid these situations.
When laying out the steps and picking the significance of the riser height and heading to your staircase, you will always take into account the dimensions of the present aperture and recall about the headroom of stairs and its minimum dimensions.
With this purpose, the measurements of the present aperture are plotted on the design of the staircase. Then we decide on which measure the edge of the aperture and the staircase overlap. Then subtract the complete height of steps up to the overlapping out of the floor-to-ceiling height.
As you see, it rarely occurs to obtain the specific match of values of significance of the riser height and moving given in the section How to build stairs. You can only get them if the floor-to-floor elevation is even divisible from the riser height. Therefore we must round the obtained values in favor of those correlations.
You mark the obtained values on the closed string or open series upward and sidewards, and remember to stick to parallel and vertical alignment of the measures.
When designing Single Winder Stairs or Dual Winder Stairs, to compute and determine the form of treads from the flight is quite tough. The form of winder treads cannot be chosen randomly. To provide for security, convenience of usage and to be given a harmonic bend of the flight, particular care must be used to evenly increase the thickness of the treads in the tread with the narrowest up and going to another square tread in the flight. At the going of the most significant winder tread in the distance of 305 mm from the border will not exceed the moving of the tiniest winder tread for over 10 mm. The centre winder tread, that’s the tread with the narrowest going, shall be positioned symmetrically to the axis extending from the vertex of the flip angle of the flight to the stage constituting the middle of rounding of the interior area of the flight. The minimum going for any tread in the narrowest point will make 152 mm based on American standards, and 120 mm based on European standards.
To be given a harmonic bend and to adhere to the minimum sizes mentioned previously, the amount of winder treads from the flight shall be from 7 to 9.