Alternating tread stairs

(Figure 10.1 d) Now allowed providing they conform to the following:

• are in one or more straight flights;

• provide access to only one habitable room plus bathroom or WC provided it is not the only WC in the dwelling;

• are fitted with handrails on both sides;

• contain treads with slip-resistant surfaces;

• have uniform steps with parallel nosings;

• have a minimum going of 220 mm and a maximum rise of 220 mm when measured over the wider part of the tread;

• conform to the recommendations regarding maximum gap for open rise treads, 100 mm.

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