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Stair Geometry - Top Tread Under Upper Floor

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Total Rise
Ideal Rise
Possible Rises




Stair Width

Tread Thickness
Riser Thickness
Nosing

Floor Thickness

Head-room


Stair Calculator rise run stringer and head-room plan diagram with full dimensions



Stair Calculator - housed stringer diagram with full dimensions


Stair Calculator - notched Stringer diagram with full dimensions




Running Measurements Vertically - Lower Floor to top of each tread
(Possible landing heights - Blue = middle)





To calculate and display upper floor opening and stair head-room, enter upper floor thickness, check the Show Head-room check-box and drag the Head slider to calculate and animate diagram head-room and floor opening.

For concrete stairs, select Concrete Thickness and enter the throat thickness (see diagram) and Stair Width to calculate formwork dimensions and concrete volume. For wooden stairs, select Stringer Width and enter the width of the stringer.





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Don't cut it, or cut it wet so there's NO DUST - Silicosis Sucks
And if you're cutting wet, wear a mask - theres dust in the spray too!

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