PROWAG (36 CFR 1190)
R408 — Stairs
PROWAG · Chapter 4: Supplemental Technical Requirements. Full current text with cross-references on BuildSpec.
R408 Stairs R408.1 General. Stairs shall comply with R408. R408.2 Treads and Risers. All steps on a flight of stairs shall have uniform riser heights and uniform tread depths. Risers shall be 4 inches (100 mm) high minimum and 7 inches (180 mm) high maximum. Treads shall be 11 inches (280 mm) deep minimum. R408.3 Open Risers. Open risers are not permitted. R408.4 Tread Surface. Stair treads shall comply with R302.6, except that changes in level are not permitted. Exception: Treads shall be permitted to have a slope not steeper than 1:48 (2.1%). R408.5 Nosings. The radius of curvature at the…
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