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OSHA
and ADA Recommendations on COF
(Exerts from Public Law 101-336)
Occupational
Safety and Health Administration (OSHA)
OSHA
states that all walkway surfaces shall be
maintained in a non-slip condition. Steps with
non-slip surfaces shall be provided; floors,
footwalks, and passageways in the work area
around machines or other places where a person
is required to stand, or walk, shall be provided
with an effective means to minimize slipping. A
static coefficient of friction of .50 or above
is considered a safe walkway surface with a dry
condition. A reading below .50 is considered an
unsafe surface.
American
with Disabilities Act (ADA)
The
ADA states that ground and floor surfaces along
accessible routes and in accessible rooms and
spaces including floors, walks, stairs and curb
ramps, shall be firm, stable and slip resistant.
The ADA sponsored a research project to conduct
test with persons with disabilities and
concluded that such persons needed a higher
coefficient of friction. A static coefficient of
friction of .60 is recommended for floor
surfaces.
Coefficient
of Friction (COF)
COF
is the measurement of slipperiness on a surface.
When testing the surface, a rubber-soled shoe
with a weight is pulled across a surface while
measuring the amount of force required to pull
it across (Static Coefficient). As may be
expected, dry rubber soles on a dry surface have
the highest coefficient of friction. For
example, on a dry untreated Gloss Ceramic Tile,
dry rubber has a COF of approx. .90 - .95. When
the tile becomes wet from mopping or spills, the
COF drops to .40 - .45. This is below minimum
safety standards.
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