2. What is Noise?
A sound which has unpleasant effects and discomfort to
ears is called as noise.
Generally sound generated by vehicles, horns,
loudspeakers, planes, construction etc. are reasons of
noise pollution.
Noise is an unwanted Sound
3. What are effects of Noise Pollution?
1) Constant exposure to loud noises can
damage ear drums and loss of hearing. It
also reduces sensitivity of ear drums to
pick up small sounds.
2) It can affect health and shows signs of
aggressive behaviour, sleep disturbance,
increase in stress level, fatigue
3) It can create hamper sleeping pattern (it
is recommended to take sound sleep and
not noise sleep :p)
4) It can increase blood pressure, heart
beat, headache
5) It affects not only on humans but also on
pets. They can behave more
aggressively if exposed to loud noises for
longer duration
6) Interference or disturbance in
conversions and it can create
misunderstanding
5. What are Noise Compliance Levels?
Acceptabl
e
Complaints
expected
Unacceptable
Day (7 am – 7 pm) 50 – 55 55 – 60 60+
Evening (7 pm – 11
pm)
45 – 50 50 – 55 55+
Night (11 pm – 7 am) 40 – 45 45 – 50 50+
Range of noise levels in dB(A) from industry – as measured outside nearby
houses. Levels are average (Leq) levels
8. What is a Noise Barrier?
Noise barriers deflect sound and protect residents
from Road & Rail noise
Expressw
ay
9. How does the Noise Barrier Works?
1. The barrier blocks the direct path from the noise source to the
receiver.
2. A shadow zone is crated behind the barrier, in which listeners are
protected from the noise.
3. However sound can still reach the receiver by diffraction at the top
10. Design of a Noise Barriers
1. As tall as possible, to stop highway noise escaping
over the top of the barrier.
2. As dense as possible, to stop road noise passing
through the barrier.
3. Have no gaps or holes in or under the barrier, that
allow road noise to pass through.
4. Have an irregular surface to diffuse the sound when
it hits the acoustic barrier.
5. Wide enough, so that traffic noise does not get
around the sides of the barrier walls.
6. Constructed to create the most effective acoustic
sound shadow possible.
All Traffic Noise Barriers Must Be...
12. Noise Barrier Panels & Sound Insulation
Single Panels
Weight
kg/m2
Sound
Insulation*
10 mm plywood / chipboard 5 15 dB
12 mm plasterboard / 1.2 mm steel / 4 mm glass 10 20 dB
3 mm lead 35 35 dB
100 mm lightweight concrete 100 40 dB
115 mm brick 200 45 dB
200 mm concrete 400 50 dB
Double Skin Panels
0.9 + 0.55 mm steel. 150mm spacing. mineral wool
infill
20 35 dB
Double glazed window, 6 mm glass. 100 mm
airspace
30 40 dB
13. Technical Specifications of a Noise Barrier
1. Noise insulation values depend on thickness of panes and
materials according to DIN EN 1793-2; RW ≥ 30 dB, DLR ≥
29 dB
2. Wind load 1.0 kN/m2 and more
3. Fire resistance class 1-3 pursuant to DIN EN 1794-2, Appendix
A
4. Load bending tested pursuant to DIN EN 1794-1, Appendix 4
14. Types of Noise Barrier System
Metal Noise BarrierConcert Noise Barrier
Transparent Noise Barrier Solar Noise Barrier
15. Why Transparent Noise Barrier?
Transparent Noise barriers are more pleasant
than conventional noise barriers
Transparent Sheet are Thermoplastic
material (PC, PMMA) and recyclable
Lighter than glass and resistant to stone
impact
Excellent resistance to weathering, UV rays
and chemicals
Excellent sound insulation up to 32 dB
Very easy maintenance: since they are not
porous, sheets can be easily washed with
water
Good fire resistance
A wide range of colours
More
Pleasant
and No
blocked
views
17. 1) Thickness :10 /12/15 mm
2) STC Rating : 32 / 34/36
3) Both side UV coated
4) Light Transmittance : 90% for clear and 80: for Colored ones
5) Tensile Strength : At least 60 N/m2
6) Modulus of Elasticity: At least 2000 N/mm2
7) Fire Retardant: As per EN 1794-2, Annex. A Class 2
8) Stone Impact Resistance: As per EN 1794-1 Annex. C
9) Fire Spread of Frame: BS 476, Part 7 , Class 1 or 2
10) Yellowing index shall be less than 10 as per ASTM D 1925 or equivalent
11) No mottling
12) The above properties shall not vary by about 5-10% of the original values over a 10-year period
Technical Specification of Polycarbonate
Sheet
20. Panel Installation System
Transparent noise barrier
panels can be installed as
1) Standalone units or
2) In combination with
aluminium noise barrier
panels.
“O” EPDM sealing rubber
profiles prevent water retention
in the metal HEA/HEB columns
and reduce the transmission of
vibrations onto the transparent
panel.
The transparent panels are
fixed on steel or aluminium
frames whose design depends
on the mechanical needs of
each particular project.
