Stringers

Interior · Stairs · printed page 359 (PDF page 360)

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Book index entries

Stair – Stringers Stringers for Stairs Interior Stairs Stair – Interior

Text in the illustration

unsupported
1"
front of tread is supported by continuous riser
tread
riser
wall
47" maximum
1" (supported by wall)
1-1/2"
front of tread is unsupported
stringer
3-1/2" minimum
9-1/2" minimum (ie. 2x10)
35" maximum
1-1/2" (not supported by wall)

Generated explanation

The illustration compares wood stair assemblies with closed risers and open risers, showing tread spans and stringer dimensions. On the left, continuous risers support the fronts of 1-inch-thick treads, with a 47-inch maximum span and a 1-inch-thick stringer supported by a wall. On the right, the open-riser assembly leaves the tread fronts unsupported and specifies 1-1/2-inch-thick treads with a 35-inch maximum span. The unsupported stringer is shown as 1-1/2 inches thick, with a 9-1/2-inch minimum overall depth and at least 3-1/2 inches of wood remaining beneath the tread-and-riser notches.

Components

stair treads stair risers notched stair stringers supporting wall

Materials

wood dimensional lumber

Related illustrations

1832

Designing steps that aren't springy

· p. 331

The illustration compares wood stairs with continuous risers to open-riser stairs, showing construction dimensions intended to limit springiness. On the left, continuous risers support the fronts of the treads, which are