sound insulation materials and constructions tsvetan nedkov, ivaylo hristev uacg 2014 г

Sound insulation materials and constructions

Tsvetan Nedkov, Ivaylo HristevUACG 2014 г.

Content

1. Sound insulation vs. Sound absorbing/Airborne sound and impact sound2. System for sound insulation of partition wall3. System for sound insulation of ceiling4. System for sound insulation of floor5. Soundproofing doors6. Sound insulation of windows7. A little theory ....


Sound insulation vs. Sound absorbing

The sound insulation reduces the amount of passed through the barrier sound energy “Wt”

The sound absorbing reduces the amount of the reflected back in the premises sound energy “Wr”

Airborne sound and impact sound


Basic principles of the sound insulations

The effective sound reduction is achieved through the combination of sound absorbing and sound insulation

Sound reduction

Sound insulation(Wo-WT)

Sound absorbingWa


Basic principles of the sound insulation

The combination of light boards with air volume between them increases the sound insulation between two premises

Double wallRw = 36 dB

Single wallRw = 30 dB

Two separate wallsRw = 50 dB


System for sound insulation of partition wall

1.Sound absorbing material;

2.Sandwich panels with elastic membrane between them;

3. Rubber spacer;

4. Vibro hanger;


инж. Цветан Недков , Технически университет София 2014 г.

The sound absorbing material can be from mineral wool, polyester wool or foamed polyurethane

Mineral woolThickness 30 – 100 kg. /m3Coefficient of air flow resistivity 10 000 – 40 000 Rayl/m

Polyester woolThickness 10 – 60 kg./m3Coefficient of air flow resistivity 2000 – 10 000 Rayl/m

Foamed polyurethaneThickness 18 – 100 kg./m3Coefficient of air flow resistivity 10 000 – 20 000 Rayl/m


The panels which are used for partition can be gypsum, gypsum faser, cement faser board or wooden boards

GypsumDensity 600 – 700 kg. /m3Thickness: 9.5, 12.5 , 15 мм

Gypsum faserDensity 1130 – 1180 kg. /m3Thickness: 10, 12.5 , 15, 18 мм

Cement fdaser boardDensity1300 kg. /m3Thickness: 10, 12.5 , 15 мм

Wooden boardsDensity 500-800 kg. /m3Thickness: 8, 10 ,15,20 мм



The elastic membrane can be bitumen membrane with supplements or heavy vinyl

Bitumen membraneDensity 1200 – 1800 kg. /m3Thickness: 2, 4 , 5 mm

Heavy vinyl:Density1800 – 2000 кг. /м3Thickness: 1, 2 , 3, 4 mm



The rubber spacer separate the hanging construction by the perimeter of the wall



The separation of the two boards of the elastic connection improves the efficiency of the sound reduction constructions

Vibro hangersThe metal part with rubber pad of SBR or EPDM rubber



The index of sound insulation Rw of the partition wall with or without insulation

Rw of brick wall = 37 dBRw of brick wall with sound insulation= 58 dB



Curve describing the index of sound insulation of partition Rw


Resonance frequency

Nat

ural

freq

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y of

os

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Bend

ing

stiffn

es

Volu

me

/ w

eigh

t /

Inde

x of

sou

nd in

sula

tion

(dB)

Frequencies of coincidenceFrequency(Hz)

Breakthroughs in the efficiency of the sound insulation Eff

ect o

f the

co

inci

denc

e

Influence of the properties of the materials over the sound insulation

①

②

③

④


Index of sound insulation Rw of partition wall without sound absorbing in the air gap

Rw without sound absorbing = 45 dBRw with sound absorbing = 58 dB



Index of sound insulation Rw of partition wall with rigid connection and with vibro hanger

Rw rigid connection = 55 dBRw vibro hanger = 58 dB



Index of sound insulation Rw of partition wall with one layer gypsum

Rw one layer gypsum = 50 dBRw two layers of gypsum borads = 58 dB



Index of sound insulation Rw of partition wall with air gap 150 мм

Rw with air gap 50 мм = 58 dBRw with air gap 150 мм = 63 dB


Sound absorbing 50 мм /rock wool/


1.Concrete slab;

2.Sound absorbing layer;

3.Hanging construction;

4,5,6.Boards with elastic material between them;

7. Vibro hanger;

System for sound insulation of ceiling


System for sound insulation of ceilingUsed materials and hanging constructions in ceiling sound insulation systems

Boards

Sound absorbing materials

Elastic layers


Index of sound insulation Rw of suspended ceiling

Rw of concrete slab 140 мм = 54 dBRw of the sound insulation system with air gap 50 mm = 73 dB



Index of sound insulation against impact noise Ln,w of suspended ceiling

Ln,w concrete slab 140 мм = 80 dBLn,w of sound insulation system with air gap 50 mm = 53 dB



System for sound insulation of floor from impact noise

1.Concrete slab;

2.Elastic membrane, mineral wool, elastomeric with high density;

3,4,5 Floor coating, laminate, carpet;

6.Baseboard;



Elastic membraneDensity 600 – 1800 kg. /m3Thickness: 2,3, 4 to 10 mm

Mineral woolDensity 150 – 180 kg./m3Thickness: 20 to 100 mm

ElastomericDensity 80 – 150 kg./m3Thickness: 5 to 30 mm


Index of sound insulation of impact noise Ln,w of floor

Ln,w of concrete floor 140 мм = 80 dBLn,w with elastic pad 6 mm = 55 dB



Index of sound insulation of impact noise Ln,w of floor

Ln,w of concrete floor 140 мм = 80 dBLn,w with mineral wool 50 mm = 59 dB



Index of sound insulation of noise Ln,w of floor

Ln,w of concrete floor 140 мм = 80 dBLn,w with elastomer 30 mm = 49 dB



Sound insulating doors

1.Metal plate;2.Elastic membrane layer;3.Heavy thick layer;4. Sound absorbing layer;5.Door case;6.Seals;7.Lock;8.External hinges;


Sound insulation of windows

Basic principals during selection of sound insulating windows:

- The windows should be with different thickness when are combined – for exmp. 4 + 6 mm or 4 + 8 mm;-The usage of wider spacers increase the index of sound insulation;- In glued together windows the adding of PVB membrane increases the index of sound insulation;-The frame and the connection to the wall have significant meaning;-The sizes of the frames – in increasing sizes of the window without extra framing the index of sound insulation is decreasing;- If it’s possible to be added sound absorbing to the internal perimeter of the frame;


Sound insulation windows

Index of sound insulation Rw of single window 4 mm



Index of sound insulation Rw of double window 4 + 12 mm air + 4mm



Index of sound insulation Rw of double window 4 + 12 mm air + 6 mm



Index of sound insulation Rw of double window 4 + 24 mm air + 6mm



Index of sound insulation Rw of double window 4 + 24 mm air + 2х4mm glued with PVBmembrane


Model of Sharp for calculation of sound insulation of double partition


Thank you for your attention!


sound insulation materials and constructions tsvetan nedkov, ivaylo hristev uacg 2014 г

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