BS 5395 Part 2 1984. This states that a spiral serving 1 habitable room should have a 600mm clear width, max rise of 220mm and centre going of more than 145mm. This would be our 1448mm diameter. For a main stair serving 2 or more habitable rooms you require a 800mm clear width (900mm in Scotland), max rise of 220mm and a centre. British Standard 5395 Part 3.pdf Free Download Here. Ladder is manufactured to comply with the relevant British Standard (BS 5395: Part 3).
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