This document discusses various methods for noise reduction in architectural design. It covers sound isolation techniques like using solid doors, double pane windows, and sealing openings. It discusses reducing sound transmission between rooms by following construction standards. Specific techniques are mentioned like using mass barriers, resilient channels, and soundproof drywall. Landscape elements can absorb sound through plants' leaves, branches and bark. Built forms like balconies and screen walls can reflect or block noise. Land use planning allocates noisy and quiet uses to different zones to prevent noise exposure. The document recommends identifying the noise source, measuring sound levels, and using appropriate absorbing materials to solve noise control problems.

1. ARCHITECTURAL ACOUSTICS
TOPIC : NOISE REDUCTION
SUBMITTED BY
Y13AP0179

2. CONTENT
• SOUND ISOLATION
• SOUND LEAKS
• NOISE REDUCTION BETWEEN ROOMS
• CONSTRUCTION DETAILS OF NOISE REDUCTION
• NOISE REDUCTION WITH LANDSCAPE ELEMENTS
• NOISE REDUCTION WITH BUILT FORMS
• LAND USING PLANNING FOR NOISE CONTROL

3. SOUND ISOLATION

9. SOUND LEAKS
• Doors: Hollow core doors are poor sound blockers. When privacy is a key
consideration, doors should be solid wood or have insulated cores, and
should be gasketed to prevent sound from passing between the door and
the jamb or sill.
• Windows: Double pane and/or storm windows reduce sound
transmission. Weather stripping helps. Windows facing exterior noise
sources should be small and as few as possible. Double-hung windows
should be able to be tightly closed.
• Wiring and piping: Holes through which wiring or conduit passes should
be sealed or caulked. Cutouts for electrical outlet boxes should be made
precisely so boxes will fit snugly. Do not install electrical outlet boxes
opposite each other on each side of a wall; these should be staggered. In
bathrooms on opposite sides of a wall, medicine cabinets should be
staggered. Holes cut out for piping should be sealed with caulking. Just
stuffing the holes with insulation is not sufficient. Sound can easily pass
through porous insulation. One can stuff the holes with insulation and
then caulk over the insulation.

11. NOISE REDUCTION BETWEEN ROOMS
• Every building, must be designed and constructed in such a way to
limit the transmission of source noise from normal domestic type
activities, through a wall or floor, between a room and internal
space where noise is likely to occur, to a level that will not cause
inconvenience to the building occupants.
Limitation:
• This standard only applies to a wall or floor forming an apartment in
a dwelling and a room in a residential building which is capable of
being used for sleeping; other than:
• a wall between an en-suite bathroom and the apartment or room it
serves
• a hospital
• a place of lawful detention.

12. NOISE REDUCTION BETWEEN ROOMS

14. CONSTRUCTION DETAILS OF NOISE
REDUCTION

15. NOISE REDUCTION WITH LANDSCPE
ELEMENTS
• This method uses plants to entrap or absorb sound vibrations. It is the most
commonly used, particularly for large scale applications.
• Sound is absorbed by all parts of the plant such as leaves, branches, twigs and
wood. The rougher the bark the better it absorbs sound. Experts say the best
species for this will have many branches and thick, fleshy leaves with thin petioles
(leaf stem).
• These broadleaf species lose their effectiveness in the winter when deciduous.
Fortunately they leaf out for maximum advantage during the months when
windows are open and you're spending time outdoors. In warm climates many
more broadleaf evergreens can be used for sound absorption benefits all year
around.
• A sound attenuation barrier is most effective when located closest to the source
of the sound.
• Large shrubby trees can also be effective at scattering sound waves. The deeper
and more dense the barrier the greater its scattering potential. This illustrates the
biggest problem: your designer needs space for an effective solution.

18. NOISE REDUCTION AND BUILT FORMS
Noise from outside a building is reflected
around a balcony space.
A screen wall is built between a noise source
and a house

19. LAND USE PLANNING FOR NOISE CONTROL
• Noise planning controls may operate at either of two
scales. At a larger planning scale are general land use
allocation noise controls.
• These are primarily allocations of various types of
development within a larger landscape context (such as a
town) to appropriate noise-environment zones.
• In other words, noise-sensitive land uses are allocated to
quieter zones and noisier land uses are allocated to noisier
zones.
• Noise control is for the most part a matter of isolating or
aggregating land uses to prevent the undesirable exposure
of noise-sensitive areas. At this scale, specific types of noise
buffers between uses are not considered.

20. THREE STEPS TO NOISE CONTROL
SOLUTIONS
• 1. Locate the source of noise The first step in noise control is to investigate the real noise
source. It has been mentioned that noise control problems may involve merely moving the
source farther from the receiver, adjusting or repairing the source if it is a piece of noisy
equipment, or replacing it. If none of these work, an acoustically efficient enclosure will have to
be designed. Once the true source has been identified, the next step is to measure the noise.
• 2. Measure the noise A sound level meter is used to measure the noise level at several
locations — at its source, along its path, and at the receiver or listener’s location — using the A-
weighted scale and also measuring the sound level in octave or third-octave bands. Sound level
meter readings will not only provide sound pressure (loudness) levels at various locations, but
will also show which frequencies are most offensive to the listener. This data will be helpful in
selecting acoustical materials with sound absorption and/or sound reduction properties best
suited to the particular application.
• 3.Noise from central equipment: When operating heating and air-conditioning equipment,
a good guideline is “lower and slower”: lower volumes of air moved through the system with
fans and blowers operating at a slower speed. Central air equipment should also be acoustically
isolated from spaces where airborne noise would be objectionable. Equipment should be
mounted on vibration isolators to avoid transmission of structure borne noise. Sound traps or
baffles will help to attenuate equipment noise in adjacent ductwork.

21. THANK YOU