Contact Information

If you would like to have your detectable warning product evaluated, please contact sales@detectablewarningtile.com If you wish to help us serve the visually impaired community by being a sponsor, please contact mark@detectablewarningtile.com If you are seeking consultation on detectable warning products, please contact eng@detectablewarningtile.com

About Detectable Warning

We review Detectable Warning products!

We at Detectable Warning Review are proud to have the opportunity to serve the visually impair community.  Because of the various types of detectable warning products available on the market, the need exist to evaluate the different truncated domes types and rank them based on a set of characteristics.  Within detectablewarningtile.com one can find various detectable warning products ranked based on a proprietary algorithmic equation.

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What is a detectable warning?

A detectable warning is “A standardized surface feature built in or applied to walking surfaces or other elements to warn of hazards on a circulation path.” (F106.5, Draft Final ADA Final Accessibility Guidelines, April 2, 2002) Detectable warning are truncated domes tile which serve as a warning stop sign to the visually impaired alerting them of a cross road, platform edge or other dangerous situations.

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Surface Applied detectable warning

Detectable warning products that are installed on a dry curb ramp are said to be surface applied.  These detectable warning products were designed so that there would be no need to rebuild a ramp in order to install an ADA required detectable warning.  The key benefit from surface applied is the cost savings from avoided construction work. 

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Cast in Place – Wet Set detectable warning

Detectable warning products that are installed during the pouring of a curb ramp are said to be cast in place or wet set.  These detectable warning products have a reputation for becoming part of the ramp.  The key benefit from having a wet set detectable warning product is that they often have strong anchoring systems which are deeply imbedded within the dried concrete sidewalk.

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Plastic detectable warning

Some truncated domes are made from plastics (Polymer based).  Detectable warning made from plastic was designed for great affordability and easy installation.  Some ADA detectable warning tile made from plastic often fade, crack and decompose under UV light.

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Composites detectable warning

Some truncated domes are made of composites of various types.  Detectable warning made of composites was designed for maximum overall quality and appearance.  Some ADA detectable warning tile made from composites are often expensive, heavy and have installation issues.

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Brick detectable warning

Some truncated domes are made of brick or brick like material.  These detectable warnings are usually pavers because of the inherent physical properties of brick.  Detectable warning made of brick was designed for maximum affordability and familiar installation.  Some ADA detectable warning tile made from brick can have poor water absorption, get damaged during shipping and are prone to weeds growing within the ramp.

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Metal detectable warning

Some truncated domes are made of metal, either cast iron or stainless steel.  Detectable warning made of metal was designed for maximum durability and snow plow resistance.  Some ADA detectable warning tile made from metal cost more, rust (except stainless) and may be heavy.

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Why are truncated domes necessary?

As a result of curb ramps becoming common in response to the requirements of the Americans with Disabilities Act (1990), an unintended consequence has been that blind pedestrians have found it more difficult to locate the boundary between the street and sidewalk. The solution to this problem was finding a surface that was both detectable either under the foot or by the cane.  It was demonstrated that truncated domes warning surfaces filled this requirement.  These truncated domes are now commonly referred to as detectable warning surfaces.  Detectable warning helps millions of visually impaired individuals by guiding them safely during their travels. 

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Specifications for ADA Detectable Warning Truncated Domes

 Verbatim from the United States Access Board – ADAAG Specifies:

705 Detectable Warnings

705.1 General.  Detectable Warnings shall consist of a surface of truncated domes and shall comply with 705.

705.1.1 Dome Size.  Truncated domes in a detectable warning surface shall have a base diameter of 0.9 inch (23 mm) minimum and 1.4 inch (36 mm) maximum, a top diameter of 50 percent of the base diameter minimum to 65 percent of the base diameter maximum, and a height of 0.2 inch (5.1 mm).

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 (17mm) minimum, measured between the most adjacent domes on a square grid.

705.1.3 Contrast.  Detectable Warning Surfaces shall contrast visually with adjacent walking surfaces either light-on-dark, or dark-on-light.

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