Standard Stair Rise And Tread Dimensions

All risers and all goings in the same flight of stairs shall be of uniform dimensions within a tolerance of 5 mm. Standard stair tread dimensions. These dimensions may be useful when laying out a staircase or if you have general questions about the size and shape of a traditional tread or a retro tread.

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A stairway in which there is a noticeable variation between the risers is a safety hazard.

Standard stair rise and tread dimensions.

Regulated by building codes stair details specify the sizes of risers and treads stair widths the placement of handrails and guardrails and construction methods for fabricating stairs. The greatest riser height within a flight of stairs cannot exceed the smallest by more than 3 8 inch. Minimum 10 inch stair tread depth with nosing or minimum 11 inches with no nosing. Maximum 12 3 vertical height rise for a flight of stairs.

If the stairs have open risers the open space between the steps cannot be large enough to allow a 4 inch sphere to pass through. Handrail graspability to be either type i or ii with a minimum 1 1 2 inch clearance from a wall. Handrail height to be placed a minimum 34 inches to 38 inches. Here is a drawing detailing our standard stair tread and riser dimensions.

Maximum 7 3 4 inch stair riser height. Application this section covers all stairways including standard spiral ship and alternating tread type stairs except for articulated stairs stairs that change pitch due to change in height at the point of attachment such as those serving floating roof tanks stairs on scaffolds stairs designed into machines or equipment and stairs on self propelled motorized equipment. The tread depth td is to be 185mm and it should not be more than 30mm shorter than the going g. Stair details refer to the standard requirements for each of the various components of a flight of stairs.

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