![]() Rise x tread, both in cm = 400 to 410 cm2.Otherwise work out the sizes of rise and tread by using any one of the following proportions: Stair Formula 2R T.Industrial buildings, Railway station, etc: Tread = not less then 250 mm (250 to 300 mm), Riser = not less then 150 mm (150 to 190 mm).Public buildings: Tread=300 mm, Riser= 150mm.Residential buildings: Tread=250 mm, Riser = 160mm. ![]() Generally: Riser (150 mm to 200 mm), Tread (250 mm to 300 mm).Headroom:Minimum of 2000mm of clear headroom is required above the pitch line.Step proportions:The size of rise and tread in a stair should be kept uniform through out the whole stair.Han-rails:It should be 750 to 850 mm in height from the top of respective step or landing.These should be provided at the start of a stair. Winders or kite steps: Odd shaped steps should be avoided and incase found necessary.Length of Step: The length of the step should be at least 600 mm.Width of landing: It should be 150mm, more than the width of stair.Pitch of the stair:It should be between 25 to 40.Length of flight: The number of steps in a single flight should not be more than 12.Width of Stair: It should not be less than 1 m.Thumb Rules for Staircase Design Calculation: Important points to consider when planning the staircase design calculation | Thumb Rules for Stircase Thumb Rules for Staircase Design Calculations | Staircase Concrete Calculations
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