External staircases are usually built to a closed string design with open risers.
They are normally manufactured in a durable hardwood such as Iroko or European oak, but treated softwood can be used for cost efficiency.

Anti-slip treads are created by either incorporating anti-slip inserts or by fluting the tops of the treads, similar to a decking profile.

The balustrade is normally kept simple by using either chamfered or square balusters and matching newel posts; this is to avoid water traps.

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