Ladders and stairs

Pages:56-62
4. Ladders and stairs
4.1. General provisions
Construction
4.1.1. No wooden ladder having any rung which depends
for its support solely on nails, spikes, screws or other similar
fixing should be used.
4.1.2. Wooden ladders should be constructed with:
uprights of adequate strength made of wood free from visible
defects and having the grain of the wood running lengthwise;
and
rungs made of wood free from visible defects and mortised
or rabbeted into the uprights.
4.1.3. Uprights and rungs of metal ladders should have a
cross-section adequate to prevent dangerous deflection.
4.1.4. The intervals between rungs should be:
equal; and
not be less than 25 cm (10 in) or more than 35 cm (14 in).
4.1.5. Rungs of metal ladders should be corrugated or treated
to prevent slipping.
4.1.6. Rungs of metal ladders should be kept clean so as to
prevent them from becoming slippery.
4.1.7. If necessary to prevent danger, ladders should be
provided with non-slip shoes, spikes or other devices to prevent
slipping.
4.1.8. Wooden ladders should be provided with a sufficient
number of steel cross-ties to ensure rigidity.
4.1.9. Portable ladders should not exceed 9 m (30 ft) in. length.
4.1.10. Every ladder or run of ladders rising to a height
exceeding 9 m (30 ft) should be provided with an intermediate
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