Q: Do stamped concrete detectable warning surfaces meet ADA
From my experience, the process doesn't produce the level of quality
specified in Public Rights of Way Accessibility Guidelines (PROWAG) developed by
the U.S. Access Board - the federal agency that developed ADA Accessibility
Guidelines, which serve as a baseline for the standards used to enforce the ADA
and Architectural Barriers Act. Other factors to consider:
Image: United States Access Board
All domes must achieve the specified dimensions of the ADA guidelines: a
base diameter of 0.9 to 1.4 inches (23 to 36 mm), a top diameter of 50% of the
base diameter minimum to 65% of the maximum, and a height of 0.2 inch (5 mm).
Stamping weakens domes. The material that ends up in the dome areas of the
form is the most fragile part of the pour; the thin liquid without the aggregate
mix pushes up into the small stamp mold area, creating an irregular dome.
Weaker domes are less resistant to wear and tear from wheelchairs,
strollers, and delivery carts. They chip and break down, requiring more
I strongly suggest you check out Detectable Warnings: Synthesis of U.S. and International
Practice at the U.S.
Access Board's Web site This free, downloadable research publication
provides a thorough study of the many different detectable warning surface
processes used, and includes user comments about the viability of processes and
According to chapter 7, page 121, second paragraph, "A high-quality surface
can only be obtained with a skillful installer. Quality control is necessary to
prevent premature dome wear."
And as stated in the case studies section (chapter 5, page 78, second
paragraph): "A number of negative reports involved the process of stamping the
truncated dome surface in concrete, with very few successful experiences.
Stamping the dome texture on sloping concrete and getting an acceptable
consistency of surface, dome height, and concrete hardness seemed to be an
extremely difficult process, requiring expert contractors. One public works
official in Minnesota stated that the dome surface had worn better than he
expected, but he would not install it again as stamped concrete because the
process was too difficult."
At this point, I leave it up to you.