Staircase Pitch Line
Staircase pitch line The maximum pitch for domestic stairs is 42 semi public stairs eg factories offices and common stairs serving more than one dwelling.
Staircase pitch line. Volute the detail like a scroll at the entry of a handrail sometimes called a monkey s tail new ascending volute wall string. Pitch line the notional line connecting the nosings of all treads in a flight of stairs. When working with stairs the only information we have to start with is the total rise or finished floor level ffl to ffl. For this reason we start the stair design with the total rise or distance between ffl s.
Homebuilding renovating there are no restrictions when it comes to width but standard flights measure 860mm and for a main staircase it is agreed that a width of between 800mm and 900mm works best. Tread the top or horizontal surface of a step. A stairway staircase stairwell flight of stairs or simply stairs is a construction designed to bridge a large vertical distance by dividing it into smaller vertical distances called steps. To comply with the regulations the minimum going should be 220mm whilst the pitch of the staircase should not exceed 42.
Usually the stairs are pretty much determined by the floors the stairs run between and the floor plans of the floors they span. And the pitch line measured at 90 to the pitch line. The maximum pitch for domestic stairs is 42 semi public stairs eg factories offices and common stairs serving more than one dwelling 38 and public stairs eg places of public assembly 33. Rake the pitch of the stairs.
Special types of stairs include escalators and. The step length must be between 56 and 67 cm. I have usually found my pitch not started with it. The step and the pitch line the step length can be solved using blondel s formula.
Stairs may be straight round or may consist of two or more straight pieces connected at angles. Yes in all buildings a handrail must be provided and positioned between 900mm and 1100mm from the pitch line or floor. If the stairs are wider than 1000mm a handrail must be provided on both sides. Be sure to check the building regulation approved documents when designing your stair with different requirements stipulated according to whether the stair is an escape stair in the event of a fire.
Pitch the angle between the pitch line notional line connecting nosings and the horizontal.