Acadia stairs can use a variety of materials to create a curved stair. We can use an open riser single stringer or double stringer. Stringers can also be on the outside of the treads like a traditional stair.
We define a curved stair as any stair that a helical or spiral geometery, but does not have a center pole. A Curved Stair can have a very tight inner radius, as small as just a few inches. Inner handrails are provided on these stairs because they have no center pole. A typical inner radius is 24" to 36". A typical tread run at the narrow edge is 6". We recommend a consistant inner curve for the best traffic pattern.
Curved Stairs can have a 10 foot or wider outer radius. If the outer radius is up against a wall, a rail on the outer radius may not be required. If the treads are 48" or wider, an outer handrail is recommended.
The walk line of a curved stair is measured near the center of the tread.