High density mineral wool has good sound deadening properties and can be encased in either high specification pre-galvanised and painted steel or aluminium panels to produce a light weight sound absorbing barrier. For more info, please visit following link: http://www.grammbarriers.com/downloads/gramm_aluminium_ml.pdf
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Gap Gramm (steel) 27/2/03 10:13 pm Page 1
GRAMM BARRIER SYSTEMS LTD
ENVIRONMENTAL AND SECURITY BARRIER SPECIALIST
High density mineral wool has
good sound deadening
properties and can be encased
in either high specification pre-
galvanised and painted steel or
aluminium panels to produce a
light weight sound absorbing
barrier. These are used
extensively throughout Europe
within urban areas and on
Steel galvanised and painted absorptive noise barriers designed for heavy traffic
on main roads and motorways.
Each panel is made of
corrosion- resistant aluminium
steel, and perforated for
The size and pattern of the
perforations are designed to
protect and maintain the
sound-absorptive capability of
the acoustic fill inside the
panels. The reverse side away
from the road, is made of non-
perforated galvanised steel,
Metal structures cut the build
up of reverberant sound
between parallel barriers,
resulting in noise reduction
higher than that provided by
the hard-surface alternates.
A unique design feature of
the aluminium and steel barrier
construction is that individual
panels can be removed and
replaced. Panels are not bolted,
welded, or otherwise
permanently fastened to each
other or to the support posts.
Should replacement be called
for as a result of structural
damage, no more than three
workmen using ordinary hand
tools will be able to do the job.
The light weight – 6lb/sq ft
(29.3 kg/m2) of the noise shield
panels also make them the
prime choice for barrier
construction atop existing
bridges, overpasses, or other
elevated transit structures
which cannot support concrete
panels of the same thickness –
4in. (102mm) weighing in at a
heavy 37 lb/sq ft (180.6 kgm2).
Aluminium modular system designed for easy
installations on roads and railways.
Lightweight aluminium panel system suitable for
bridges and underpasses.
Combined aluminium absorpative and acrylic barrier system allowing bespoke architectural designs.
All components are
Gap Gramm (steel) 27/2/03 10:13 pm Page 2
Octive Band, Hz
Sound Transmission Loss, dB
Sound Absorbption Coefficients
Caption to come
A Perfected System
meet all requirements:
The acoustic performance meets all the current UK and
European regulations for roadside applications.
• exceeding the noise
• guarantee a large measure of
• are steady and dimensionally stable
• they are resistant to ageing and corrosion
• they are dimensionally accurate
• they are colourfast and resistant to fire
• they are resist impacts from stones and are largely
Random Incidence Sound Absorption:
• Tested to BS 3638 (BS EN 20345: 1993)
• Noise reduction coefficient (250-2000Hz): a=0.98
• Tested to proposed CEN standard, pr EN 1793:1
• DLa= 16 dB, Class: A4
• Tested to BS 2750: Part 3 (BS EN20140: Part 3)
• Weighted Sound Reduction Index, Rw,= 30dB
(BS 5821: 1984)
• Tested to proposed CEN standard, pr EN 1793:2
• DLR= 24.6 dB, Class: B3
Effective Panel Height:
* Other dimensions to special order.
** Nominal dimensions and to special order only.
Structural Steel Universal Columns from low
carbon steel to BSEN 10025, 152mm x 152mm
for standard systems.
75mm Thick mineral wool with black glass
tissue face. Density 60kg/cubic meter.
Top and bottom Aluminium profiles in natural finish.**
Panels in a choice of Polyester powder coated, semi gloss
Posts in a hot dip galvanised finish to BS 729.**
* Can be powder coated to special order.
Tel:01323 872243 • Fax:01323 872244