Building Utilities 3: Acoustical Design of Rooms PDF

BUILDING UTILITIES 3 Acoustical  Design of Rooms PLANNING for good acoustics  11 Steps / Measures 1. The selection of the Site 2. The making of a noise survey 3. The arrangement of the rooms 4. The selection of proper sound-insulation 5. The control of noise 6...

BUILDING UTILITIES 3 Acoustical  Design of Rooms PLANNING for good acoustics  11 Steps / Measures 1. The selection of the Site 2. The making of a noise survey 3. The arrangement of the rooms 4. The selection of proper sound-insulation 5. The control of noise 6. The size of the room PLANNING for good acoustics  11 Steps / Measures 7. The distribution of absorptive and reflective materials 8. The supervision during installation 9. The installation of sound-amplification equipment 10. The inspection 11. The maintenance instructions Requirements for good acoustics  1. All noises should be reduced Requirements for good acoustics  2. The room’s shape and size should be designed Requirements for good acoustics  3. The reverberation time should approach the optimum characteristics Requirements for good acoustics  4. Provision of appropriate acoustic materials Features that apply to both  speech and music rooms 1. Freedom from disturbing noise 2. Proper shape of the room 3. Sufficient sound level for the listeners Design of room shape  1. Floor Plan 2. Elevation of Seats 3. Ceilings 4. Side Walls 5. Rear Walls 6. Balcony Recess Acoustical materials  Categories 1. Pre-Fabricated Units 2. Acoustical Plaster and Sprayed 3. Acoustical Blankets Pre-fabricated units  ▪ Acoustical tile, ▪ Mechanically perforated units backed with absorbent material, ▪ Wall boards, tile boards and absorbent sheets Pre-fabricated units  Pre-fabricated units  Pre-fabricated units  Acoustical plaster and sprayed  ▪ Plastic and porous materials applied with trowel, ▪ Fibrous materials combined with binder agents which are applied with sprayed on an air gun of blower Acoustical plaster and sprayed  Acoustical blankets  ▪ Blankets made up of mineral or wood wool, glass fibers, kapok batts, and hair felt Acoustical blankets  Pre-fabricated acoustical units  Types and Sub-Classifications ▪ TYPE 1 – Cast Units having a pitted or granular- appearing surface. Class A – mineral units composed of small granular of finely divided particles with Portland cement binder. Pre-fabricated acoustical units  Types and Sub-Classifications Class B – mineral units composed of small granules or finely divided particles with lime or gypsum binder. Pre-fabricated acoustical units  Types and Sub-Classifications Class C –composed of small granules or finely divided particles of mineral or vegetable origin with incombustible mineral binder. Pre-fabricated acoustical units  Types and Sub-Classifications ▪ TYPE 1I – Units having perforated surface; the perforations to be arranged in a regular pattern. Class A – Units having a perforated surface which acts as a covering and support for the sound absorbent material to be strong and durable and substantially rigid. Pre-fabricated acoustical units  Types and Sub-Classifications Class B – Units having a circular perforations extending into the sound absorbent material. Class C – Units having slots or grooves extending into the sound absorbent material. Pre-fabricated acoustical units  Types and Sub-Classifications ▪ TYPE III – Units having a fissured surface Class A – Units composed of long wood fibers. Class B – Units composed of fine felted vegetable fiber or wood pulp. Pre-fabricated acoustical units  Types and Sub-Classifications Class C – Units composed of mineral fibers. Pre-fabricated acoustical units  Types and Sub-Classifications ▪ Type IV - ( Q-T Ductliner, Celotex, Corp.)