Thank you for this Helen,
I have found the following information on this subject through various
sources:
1. Taken from the draft 2008 revision of the British Standard BS8300.
D.4 Ramps and sloping surfaces
On a sloping surface, the lateral component of the force in contact with
the surface increases as the gradient of that surface increases. To
compensate for this, a sloping surface needs to have a higher coefficient
of friction that an equivalent level surface to maintain the same degree of
traction.
The additional slip resistance can be approximated by expressing the
gradient as a percentage and adding this to the slip resistance value for
an equivalent level surface. For example, for a 1:20 slope, the gradient is
5% and the required SRV is increased by 5. For a 1:12 slope, the gradient
is 8.3% and the SRV needs to be increased by 8.3. Where a ramp is likely to
become wet, the recommended PTVs for ramps of different gradients are 41
for shallow ramps of 1:20 and 45 for the steepest recommended gradient of
1:12.
2. From http://www.building.co.uk/story.asp?storycode=1028196
For public and commercial areas, [the German Standard] DIN 51130 defines
five slip-resistant classes – from R9, the lowest, to R13, the highest slip
resistance. For instance, for entrance areas, R11 is recommended. For
sloping ramps which are used for wheelchair access, R12 is recommended.
3. From http://www.slipandfall.com/Other_Slip_and_Fall_Related.htm
The Occupational Safety and Health Administration recommends that walking
surfaces have a static coefficient of friction of 0.5. A research project
sponsored by the Architectural and Transportation Barriers Compliance Board
(Access Board) conducted tests with persons with disabilities and concluded
that a higher coefficient of friction was needed by such persons. A static
coefficient of friction of 0.6 is recommended for accessible routes and 0.8
for ramps.
It is recognized that the coefficient of friction varies considerably due
to the presence of contaminants, water, floor finishes, and other factors
not under the control of the designer or builder and not subject to design
and construction guidelines and that compliance would be difficult to
measure on the building site. Nevertheless, many common building materials
suitable for flooring are now labeled with information on the static
coefficient of friction. While it may not be possible to compare one
product directly with another, or to guarantee a constant measure, builders
and designers are encouraged to specify materials with appropriate values.
As more products include information on slip resistance, improved
uniformity in measurement and specification is likely. The Access Board's
advisory guidelines on Slip Resistant Surfaces provides additional
information on this subject.
4. From http://www.safety-engineer.com/adasurfaces.htm
What materials may satisfy ADAAG requirements?
In new construction and alterations, surface materials must be specified to
be slip-resistant. If there is a choice between flooring materials
otherwise suitable for a particular application, we recommend choosing the
material with the higher coefficient of friction, particularly for ramps.
Materials that might be appropriate for ramps and level surfaces include
concrete wood float surfaces, asphalt, and some types of carpets and
resilient tiles. Materials which might be expected to be satisfactory for
level surfaces, but which might not be appropriate for ramps, include
concrete metal trowelled surfaces, ceramic tile, hardwood and flagstone.
These finishes, tested during the Access Board research project, yielded
coefficients of friction that fell within the recommended ranges for
accessible routes.
However, not all products of the type mentioned may provide the desired
slip resistance and many other materials can be expected to be suitable
even though they are not included here. For example, some types of
materials for which the coefficient of friction is low, are available--or
can be treated--with finishes that increase slip resistance.
Kindest regards,
Antoinette
Dr Antoinette Fennell
Project Manager
Centre for Excellence in Universal Design (CEUD)
National Disability Authority
25 Clyde Rd
Dublin 4
Tel: +353 (0)1 6080 478
Fax: +353 (0)1 6609 935
Web address www.universaldesign.ie
CEUD Vision: “The Centre is dedicated to the principle of universal access
for people in Ireland to participate in a society that takes account of
human difference, enabling everyone to interact with their environment to
the best of their ability”
"Access and the City- universally designed communications for ease of
visiting and effective living in cities and towns"
20 November 2008
more details on www.universaldesign.ie
in conjunction with Dublin City Council and the European Observatory Towns
and Cities for All
"Bryant, Helen"
<Helen.Bryant@REA
DING.GOV.UK> To
Sent by: [log in to unmask]
Accessibuilt list cc
<ACCESSIBUILT@JIS
CMAIL.AC.UK> Subject
Re: SRV (Slip Resistance Value) for
an external ramp
10/11/2008 16:49
Please respond to
Accessibuilt list
<ACCESSIBUILT@JIS
CMAIL.AC.UK>
http://www.prospectiles.com/resources/resources1.htm - this website appears
to have the answer.
Regards,
Helen
-----Original Message-----
From: Antoinette M. Fennell [mailto:[log in to unmask]]
Sent: 10 November 2008 16:31
To: [log in to unmask]
Subject: SRV (Slip Resistance Value) for an external ramp
A second query if you don't mind!
Does anyone have any reference (threshold or range) for SRV (Slip
Resistance Value) for an external ramp?
A concrete and flagstone manufacturer is wondering if untextured flags can
be used on ramps.
Thanks,
Antoinette
Dr Antoinette Fennell
Project Manager
Centre for Excellence in Universal Design (CEUD)
National Disability Authority
25 Clyde Rd
Dublin 4
Tel: +353 (0)1 6080 478
Fax: +353 (0)1 6609 935
Web address www.universaldesign.ie
CEUD Vision: “The Centre is dedicated to the principle of universal access
for people in Ireland to participate in a society that takes account of
human difference, enabling everyone to interact with their environment to
the best of their ability”
"Access and the City- universally designed communications for ease of
visiting and effective living in cities and towns"
20 November 2008
more details on www.universaldesign.ie
in conjunction with Dublin City Council and the European Observatory Towns
and Cities for All
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