Timber Reflective Noise Barriers are HighwaysAgency approved and conform to the latest Tec Memo HA 65/94 (Part 1) and HA 66/95 (Part 2), as well as BS EN 1793 and BS EN 1794.@ https://www.grammbarriers.com/downloads/Gramm_Timber%20Reflective_Specification.pdf

1. Acoustic Barriers
TIMBER REFLECTIVE NOISE BARRIER - ACOUSTIC FENCING
Gramm Barrier Systems Registered in England and Wales No: 05836133

2. Timber Reflective Noise
Barrier - Acoustic Fencing
Technical specification:
Environmental Barrier of this specification has a density of 26.5 kg/m2 and achieves a
Weighted Sound Reduction in excess of 29Db A in Laboratory tests.
All timber materials sourced from a FSC, QA Sector Scheme 4a approved supplier.
We have also designed
our Noise Barriers to have
a life span of 30 Years!
We have put a lot of thought into
our noise barrier range and have
designed all our systems to be
maintenance free for the full life
span of the barrier.
30
Full Design, Supply and
Installation of Your Noise
Barriers
The key to a successful project using noise barriers,
acoustic fencing, acoustic barriers or sound barriers is
getting the right design in place at the very beginning.
Our expert engineers will:
- Assess your needs to ensure we fully meet both
your current and future requirements.
- Recommend the correct type of reflective and
absorptive noise barriers for your project.
- Take into account ALL your needs. This includes
not only how effectively your chosen noise barriers
and acoustic fencing absorb and reflect sound,
but whether they also look right for each particular
location, and how easy they are to maintain.
Having taken the time to make sure you have the best
possible acoustic barriers for your project, we will
supply and install them on time, and on budget.
Tried, Tested, Trusted
We have a reputation for providing the very best
products and service on every project we undertake.
We offer a full service, from the initial concept of any
noise & environmental barrier project right through to
commissioning and completion.
We will advise and guide you on the right acoustic
barrier product for your environment and produce
designs and drawings showing how the barriers
will be placed to be most effective. We will then
manage every aspect of the sound barrier supply and
installation, working closely with any other contractors
involved in the project to ensure we meet all the
agreed deadlines to have the noise barriers in place
and working just the way you require.
This commitment to providing only the highest levels
of service means you can rely on Gramm Barriers,
whatever your sound barrier & environmental barrier
needs.
Call now to find out just how we can work with you
and provide the best acoustic barrier installation
service you could wish for.
Timber Reflective Noise Barriers are Highways
Agency approved and conform to the latest Tec
Memo HA 65/94 (Part 1) and HA 66/95 (Part 2), as
well as BS EN 1793 and BS EN 1794.
Gramm Barriers systems have uniquely designed
there Acoustic Fencing systems to offer the highest
levels of sound reduction on the market!
Our Timber Reflective Noise Barriers can be installed
in any location with either concrete in or base plated
posts. All our installers have worked with us for over
15 Years and work to the high levels quality and
professionalism we demand!
Industry Leading Sound
& Environmental Barriers
Our Noise Barriers and Sound Fencing come in a full
range of materials, allowing us to supply and install
exactly the right product for you project. This includes
reflective & absorptive sound barriers manufactured
from:
Timber, Acrylic, Aluminium, Plastic (acrylic,
polycarbonate and recycled) and Concrete noise
barrier panels.
We also offer an additional product to enhance even
further the noise reducing characteristics of acoustic
screens.

3. page 1
Gramm Timber
Enviromental Reflective
Barriers
The above specification is the property of Gramm Barrier Systems Ltd.
Structural calculations may be required by
qualified persons, no responsibility can be
accepted by using this design without
professional advice.
Design in accordance with specification for
highway works clause 2504 treatment to
sector scheme 4.
Reflective sound screen fitted to timber posts
(for illustration purposes only). Steel posts can
be alternative.
Height of sound screen variable to suit specific
locations. Post centres at 3.0M unless otherwise
specified.
Conforms and tested to BS EN 1794-1 and BS
EN 1794-2.
Complies with highways sector scheme 2C for
the prefabrication of environmental barriers.
Average density 26.5KG/M2 (excluding posts).
1
2
3
4
5
6
7
Please note:
Comprising Gramms galvanized steel RSJ noise
barrier posts or C24 stress graded timber posts
dependent on height & location designed to take wind
loadings & turning moments with specially
manufactured galvanised steel rail cleats fixed to the
posts with stainless steel hex bolts. Foundation and
post size dependent on height and location.
ST5 concrete to be used for post foundations.
Timber panels to be constructed on site. Panels to
comprise horizontal structural rails, and 1 no. gravel
board, fixed to posts with galvanised mild steel cleats
and stainless steel bolts and coach screws. Barrier
clad face side only with vertical main noise barrier
boardw and cover boards and surmounted by once
weathered capping, all securely fixed to rails and
gravel board with stainless steel annular ring shank
nails.
Timber Species: Douglas Fir & Larch – pressure
treated Tanalith E preservative (Green) Ex Works.
All in accordance with the Specification for Highway
Works Technical Memorandum HA66/95, BS EN1793:
parts 1-5 and BS EN1794: parts 1 & 2.
Environmental Barrier of this specification has a
density of 26.5 kg/m2 and achieves a Weighted
Sound Reduction in excess of 29Db A in Laboratory
tests.
Note: Post lengths/sections, foundation sizes & post
spacings may vary subject to final site survey, design
calculations and safety barrier requirements.

4. Reflective
Sound screen
Size: 8.64m2
SOURCE ROOM
Volume: 136m2
Condition: Clean
Type: Small Reverberation room
Location: Acoustic transmission suite
RECEIVING ROOM
Volume: 220m2
Condition: Clean
Type: Small Reverberation room
Location: Acoustic transmission suite
FREQUENCY
HZ R
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
24.70
25.30
26.30
25.80
28.80
28.40
29.00
29.60
30.00
30.10
29.80
29.70
30.60
31.60
32.10
33.70
36.90
37.10
TEMPERTURE
HUMIDITY
DLR
Test Results for Gramm Barrier Systems Ltd. Issued by University of Salford (Acoustic Test
Laboratory) UKAS accredited test laboratory No. 1262
17.8 C
58.60%
30 Category: B3
Technical specification:
Environmental Barrier of this specification has a density of 26.5 kg/m2 and achieves a
Weighted Sound Reduction in excess of 29Db A in Laboratory tests.
All timber materials sourced from a FSC, QA Sector Scheme 4a approved supplier.
10.00
20.00
30.00
40.00
SoundReductionIndexR(dB)
60.00

5. Natural timber movement is not prevented since
boards are free to expand and contract
naturally and therefore splitting and gaps do not
occur.
Special ring shank nails
(in stainless steel) prevent removal of cover strips
and boards by vandalism.
Lateral Timber Movement
The above specification is the property of Gramm Barrier Systems Ltd.
Standard
detail
drawing:
The design of the
panels should avoid
gaps occurring under
operational conditions,
such as shrinkage and
warping.
“If timber is used for panels,
the minimum design thickness
should be based on the
seasoned dry weight of the
timber.
A gravel board of durable
material will be needed if the
panels are made of material
likely to deteriorate when in
contact wit the ground.”
Technical specification:
Environmental Barrier of this specification has a density of 26.5 kg/m2 and achieves a
Weighted Sound Reduction in excess of 29Db A in Laboratory tests.
All timber materials sourced from a FSC, QA Sector Scheme 4a approved supplier.

6. Gramm Barrier Systems Ltd
Head Office
18 Clinton Place,
Seaford,
East Sussex,
BN25 1NP
Contact
-
Tel: 01323 872243
Fax: 01323 872244
National: 08442 259002
Email: info@grammbarriers.com