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4 Cards in this Set
- Front
- Back
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Code requirements specific to spiral stairs |
- min. unit run inside stringer 150+ - avg. Unit run at centerline at least 200mm - if closed risers are used, must be vertical |
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Why must a secon layout point be established for curved stairs? |
Since the nosing must be equal, a parallel line must be drawn to mark back of tread. The back edge radiates from the second layout point. |
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What are the main differences between circular and spiral stairs? |
- spiral stairs converge to a center point - spiral stairs are required to have a min. tread width of 150 rather than min. unit run of 150. |
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Why are spiral stairs not allowed as the only means of egress? |
Because of the steepness. |
