A reader's Stairs question: Stair riser gap?
Peter B. from Gold Coast, Australia had this Stair riser gap question.As I understand stair design, the BCA requires that the vertical gap between the top of one tread and the underside of the tread above (in an open stair) must not permit a 125mm ball to pass between the treads.
What type of obstacle would you recommend to comply with this requirement?
Hi Peter, This is a real pain, you would have to say that 99% of stairs of this type already built, don't comply with this rule. A typical 40 thick tread and a fairly average rise of 175 gives a gap of 135. Just 10mm too much.
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