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2013 California Standards for Accessible Design Pocket Guide

Note: This document or portion of document references a state or local code that is stricter than the 2010 ADA Standards requires.

11B-705.1.1.2 Dome spacing.

Truncated domes in a detectable warning surface shall have a center-to-center spacing of 2.3 inches (58 mm) minimum and 2.4 inches (61 mm) maximum, and a base-to-base spacing of 0.65 inch (16.5 mm) minimum, measured between the most adjacent domes on a square grid.

[2010 ADAS] 705.1.2 Dome Spacing.  Truncated domes in a detectable warning surface shall have a center-to-center spacing of 1.6 inches (41 mm) minimum and 2.4 inches (61 mm) maximum, and a base-to-base spacing of 0.65 inch (17 mm) minimum, measured between the most adjacent domes on a square grid.

Exception:  Where installed in a radial pattern, truncated domes shall have a center-to-center spacing of 1.6 inches (41 mm) minimum to 2.4 inches (61 mm) maximum.

Figure (a) shows an enlarged elevation of a truncated dome with technical requirements for the base diameter and the top diameter of the truncated dome. Figure (b) shows a plan view of the layout of the truncated domes with minimum measurements between the domes and center to center spacing for the truncated domes.

FIGURE 11B-705.1 ‡‡

SIZE AND SPACING OF TRUNCATED DOMES

Source: 2013 California Standards for Accessible Design Pocket Guide by California Building Standards Commission (edited by Evan Terry Associates) - published 01/01/2015

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