| Exterior stairways
that are used for buildings that are two stories or less can be built
from building materials no less than 2 inches nominal thickness.
Remember that nominal thickness applies to the width of construction
standard building materials. Most 2 x 4's aren't 2 inches thick, even
though they're referred to as 2 x 4's. The nominal thickness of a 2 x 4
used in Southern California is one inch and a half.
Example: The picture above is a set of exterior stairs built using 2 x
12 stringers and 2 x 12 stair treads. It's not uncommon to find a heavy
duty exterior stairway built using 4 x 12 stringers and 3 x 12 treads.
I've seen exterior stairs built using 2 x 12 stair stringers, along with
plywood treads and risers, so make sure that you check with your local
building department to verify this particular building code.
Attention: Don't forget to check with your local
building department to verify any building codes on this website. This
information could be incorrect or outdated. Building codes are updated
regularly and to some building departments have different
interpretations for certain building codes.
Exterior Stairways - 3
Stories or More
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