Maximum 4-1/2 inch handrail projection into stairway width, on either side. The minimum width of the handrail above the recess shall be 1.25" to a maximum of 2.75". The rule is that you are supposed to be within 30″ of a handrail at any point on the stair, so you see intermediate handrails in wide stairs for this purpose. AND if one exit stairway is “lost” (i.e. The minimum clearance shall be maintained the full width of the stairway and landing. Phone Pear Stairs on 01938 553311. “The requirement is based on the required capacity of the stair established by Section 1005.3.1, not the actual width, and mandates that at no point shall the required capacity or minimum width be more than 30 inches from a handrail. The IRC stairs code states that the minimum width for stairs be no less than 36 inches. 1009.7.2 Riser height and tread depth. However the recommended minimal with should be between 800mm and 1000 mm, to allow not only to only climb that staircase with comfort but you can actually bring something up on it. All treads in any one flight between landings shall have identical dimensions within a three-eighths inch tolerance. So what is the required minimum stair width required in an apartment block? Instead, you would go to 1009 and find that the minimum per stair is 44". to a maximum of 1-¼-in. Nosing. For other stairs, a minimum width of 1,200 mm, and 1,000 mm between handrails. (Title 24, Part 2, Section 2-3326(f).) In design compliance for buildings, the minimum stair width will be the minimum to satisfy Building Regulations B (or BS9991), M and K, all at the same time.

There are also codes in place for standard stair tread dimensions. Because of the sprinklers, you don't need to abide by the 48" minimum of 1007. (f) Stairway platforms shall be no less than the width of a stairway and minimum of 30 inches in length measured in the direction of travel. Also assuming a non-accessible stair where the required minimum egress width per table 1105.1 controls, the horizontal exception for handrails would still be applicable. Stair Width (1) Except as provided in Sentence (2), required exit stairs and public stairs serving buildings of residential occupancy shall have a width, measured between wall faces or guards, of not less than 900 mm. Exception #2: Clear width of 48” not required in building sprinkled throughout. (1) Stair railings shall be provided on the open sides of all exposed stairways. To guarantee compliance with Building Regulations (Part K: Protection from falling, collision and impact), all staircases must be designed, constructed and installed safely. The International Residential Code dictates stair code requirements specific to residential buildings. Section 1009.3 Accessible egress stair minimum 48” between rails. But, this rule includes a phrase that states that its only for the required width. Nosings are required to overhang a minimum of ¾-in. Nosings are required to overhang a minimum of ¾-in. These stair regulations stipulate that all staircase steps should be level. 2.33 A stair of acceptable width for everyday use will be suf cient for escape purposes, but if it is also a fire-fighting stair, it should be at least 1100mm wide (see Appendix C for measurement of width). occupants cannot access it due to a fire) the remaining stairway width(s) cannot be reduced to less than half the required combined width. The combined width calculation performed above must be distributed between the minimum number of required exits while still meeting the minimum width requirement. For code requirements, the minimum staircase width is the horizontal dimension between the sidewalls of a staircase, measured above the handrail(s).

tallest portion of the profile. You should also consider how furniture will be transported upstairs. ErectaStep commercial stairs with winders will be custom orders. When it comes to the width, there is no regulated minimum. Maximum 12′-3″ vertical height (rise) for a flight of stairs. Therefore, you would need 3 stairs at 44" wide each (3 * 44 = 132). to a maximum of 1-¼-in. Stairs with winders need to be at least 11″ deep and when 12″ in from the narrow edge and the minimum depth must be 10″. If the stairs are more than 2 m wide, then they should be divided into flights of no less than 1,000 mm. Stair riser heights shall be 7 inches (178mm) maximum and 4 inches (102mm) minimum . Edges shall have a minimum radius of 0.01". Instead, you would go to 1009 and find that the minimum per stair is 44". From the top flight of stairs to the bottom of the stairs, each individual riser cannot exceed a difference of 3/8 of an inch. Section 1011.2 Minimum width shall be not less than 44”.