drywall aocustic insulation analysis 2015

8/18/2019 Drywall Aocustic Insulation Analysis 2015

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TWIGA

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A Technical Licensee of-

Twiga Insul- overview

U.P.Twiga Fiberglass Ltd.


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Dry wall acoustic Insulation Analysis


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How Insulation works

Inorganic glass fibers 100% pure and free from un-fiberised shots,

slags and corrosive elements like sulphur, cloride.

Long resilient Glass

fibers Air

pockets-

inter

connected

Laminar structure to

resist Air flow, create

friction and convert

sound to heat energy

hence reducetransmission and

facilitate absorption.


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Acoustic Isolation : The Concept

• ‘MASS’ – ‘SPRING’ – ‘MASS’

• Mass – To isolate: High density board – gypsum or cement orgypsum and cement in combination

• Spring – To absorb energy / dampening effect: Low density, resilientand flexible insulation – Glass wool at 12,16, 20, 24,32 or 48Kg/cu.m density.

Cement+ Gypsum boards (‘MASS’)

Cement+ Gypsum boards (‘MASS’)

Glass Wool

(‘SPRING’)


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Mass-Spring-Mass concept for double leaf

wall : How Glass wool helps -

• The resonance frequency at which maximum

transmission occur shifts to improve dB loss.

• Absorptive Glass wool (e.g α=0.91) createsenough friction, so that it helps to convert soundto heat energy and reduces transmission.

• Lateral standing sound waves is also reduced

due to the same reason as above.


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Density as a non critical factor: European study

(Acoustic Working Group- Saint Gobain)• Air flow resistivity (r) linked with density of insulation has a

positive impact on sound isolation, but if it is more than r =5 K.Pa.s/sq.m, with higher density it produce negativeresults.

Insulation [ system:

12.5 mm gyp+45mm

Ins+12.5 mm gyp]

Amount of filling Rw(dB)

Lightweight Glass wool:

12.5-26 Kg/cu.m: r =

approx.5 K.Pa.s/sq.m

Fully filled, 45 mm

Overfilled , 70 mm

47

48

Stone wool 35 Kg/cu.m

r > 5 K.Pa.s/sq.m

Fully filled, 45 mm

Overfilled , 70 mm

46

44


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Cont.

Insulation [ system:

12.5 mm gyp+70mm

stud x2 filled with

Ins+12.5 mm gyp]

Amount of filling Rw(dB)

Lightweight Glass wool:

12.5-26 Kg/cu.m: r =

approx.5 K.Pa.s/sq.m

Fully filled, 150 mm

Overfilled , 170 mm

62

62

Stone wool 35 Kg/cu.m

r > 5 K.Pa.s/sq.m

Fully filled, 150 mm

Overfilled , 170 mm

61

58

Overfilling the cavity increasing coupling between the leaves and hence

deteriorate damping effect.

Density is not critical criteria for acoustic absorption


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Lighter is better

Glass wool: 12

Kg/cu.m,

50mm

(1)

Glass wool: 16

Kg/cu.m,

50mm

(2)

Glass wool: 20

Kg/cu.m,

50mm

(3)

Glass wool: 32

Kg/cu.m,

50mm

(4)

Stone wool:60

Kg/cu.m,

50mm

(5)

STC-43, Rw-45(Gypsum

Board)

Rw-44(Gypsum

Board)

STC-49,Rw-49

(Gypsum)

STC- 51

Rw-50(Cement board)

STC-41Rw-46

Rw-50

Same/betterthan (4); 62%

Lightweight

Similar to (1) Similar to (5),33%

Lightweight

Noimprovement

in STC, 3

Times heavy

in weight

Drywall system: 70 mm stud+ single layer on both side of stud+ 50mm Insulation


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Resonating Frequency

Duraline-13mm

(1)

Std. Gypboard-12.5 mm

(2)

Fireline-15 mm

(3)

Cement board-8mm

(4)

1600 -3150 Hz 3150 2000-2500 4000-5000 Hz

Avg. loss : 7dB Avg.Loss: 4dB Avg.Loss: 5dB

(double board)

Avg. Loss: 2dB

Negatively

impacted STC

result

Better than (1) Least Impacted


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High Acoustic Absorption


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High Acoustic absroption


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Lightweight Glass wool – Well acceptedInternationally

• British Gypsum: Glass wool:18 Kg/cu.m• Kanuf: Glass wool 10, 16, 19.5 Kg/cu.m

• Boral: Glass wool 16 Kg/cu.m

• Gyprock: Glass wool 11, 14 Kg/cu.m


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Glass wool fibers

• Pure, long resilient

• Not broken/settlement of fibers

• Long performing fibers

• Available in flexible roll andrigid/ semi-rigid board


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Microscopic view

Inorganic glass fibers 100% pure and free from un-fiberised shots,

slags and corrosive elements like sulphur, cloride.

Long resilient Glass

fibers Air

pockets-

inter

connected

Laminar structure to

resist Air flow, create

friction and convert

sound to heat energy

hence reducetransmission and

facilitate absorption.


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Twiga roll and boards products

Product Description

Twiga Fiberglass wool

flexible blanket/Roll

form

Density: 10-48 Kg/cu.m

Thickness*: 25 – 100 mm

Roll length*: 7.5 m – 30 m

Facing: One or both faces as required

Flanges: 50 mm (on one or both side)

Facing material: Aluminum based FSK, Polypropylene based

– WMPVR, WMP-50, PSK.Glass cloth based-Aluglass cloth.

Twiga Fiberglass wool

semi-rigid or rigid

board

Density**: 32 – 64 Kg/cu.m

Thickness*: 15 mm – 75mm

Facing: One or both faces as required

Facing material: Aluminum based FSK, Polypropylene based

– WMPVR, WMP-50, PSK.Glass cloth based-Aluglass cloth.


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Thermal and acoustic properties

Product Code Unit TI-750/50 TI-1000/50 TI-1250/50 TI-1500/50 TI-2000/50 TI-3000/50

Density (D) Kg/m3 12 16 20 24 32 48

Thickness (L) mm 50 50 50 50 50 50

Thermal

conductivity(K) at 25

degC

W/mK 0.041 0.039 0.036 0.033 0.033 0.03

Thermal

resistance

(R=L/K) at 25

deg C

m2.K/W 1.22 1.28 1.39 1.52 1.52 1.67

Noise

reduction

Coeff. (NRC)

0.71 (25mm) 0.9 0.9 1 1.05 1.2

Sound

Transmission

Class ( STC)*

dB

(Transmissio

n Loss)

43 44-46* 49 No data 41

Not

suggested for

drywall

*for drywall system with single layer Glass wool and 12.5 mm Gypsum boards on both side


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Fire parameters of glass wool

476 4

476 5

,


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Environment, Health & SafetyAssessment parameter by SGBC Type of criteria Test Result/ Conformance Test Lab

Emission parameter- Total Volatile Content (TVOC) Mandatory Pass/Conform PSB Singapore

Emission parameter-Phthalates

Mandatory Pass/Conform PSB Singapore

Emission parameter-Formaldehyde Mandatory Pass/Conform PSB Singapore

Emission parameter-4-Phynylecyclohexen

Mandatory Pass/Conform PSB Singapore

Hazardous substance –Halogenated solvent, Aromatic solvent

Mandatory Not detected / Conform PSB Singapore

Hazardous substance –Mercury, Lead, Cadmium Mandatory Not detected / Conform PSB Singapore

Hazardous substance –Hexvalent Chromium Mandatory Not detected / Conform PSB Singapore

Hazardous substance-Tin Mandatory Not detected / Conform PSB Singapore

Hazardous substance- Phthalates Mandatory Not detected / Conform PSB Singapore

Hazardous substance- Halogenated binding agent

and Halogenated flame retardant, Ozone Depleting

substances, Polybrominated Biphenyls,

Polybrominated Diphenyl Ethers and Short ChainParaffins

Mandatory Not detected / Conform PSB Singapore

Hazardous substance- Asbestos Mandatory Not detected / Conform PSB Singapore


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Other general parameters

General parameters and features Details Complying Standards

BiologicalInorganic. Does not encourage growth

of fungi and verminIS 8183/IS 3144

Recovery after compression >95% IS 8183

Moisture content, absorption < 2%, Hydrophobic in nature IS 8183/IS 3144

Vibration and jolting Does not settle in vertical cavity IS 8183/IS 3144

Non corrosiveFree from sulphur and chloride

contentIS 8183

Twiga Insul – Time tested and proven brand in Insulation


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Twiga Ambernath facility


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Fiberglass wool insulation products

• Blanket/Roll• Boards/Panels

• Preformed Pipesection/Lamella Mat

• Flexible duct

• Fiberglass Tissue


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• A leading manufacturer fiberglass Wool Insulation in India.

• A Technical licensee of ISOVER-Saint Gobain

• International certification: ISO 9001, ISO 14001, OHSAS 18001.

• Product Approval- FM Approval (HVAC, building), Singapore Green product certification

GRIHA, IMO, Indian Navy etc.

• Approved supplier of Central Public Works Dept., Engineers India Ltd., National Thermal Power

Corporation, Metro Rail Corporation, Military Engineering Services, Indian Rail

• Total Capacity : 18000 MT per annum.

• Three manufacturing units- Ambernath (MH) Sikandrabad (U.P), Ghaziabad (U.P)

• Supplying to domestic (India) and international market (SEA-countries -Singapore, Hong Kong,

Vietnam, Sri-Lanka, Taiwan etc.

• Product diversification (Flexible ducts, Pre-formed Pipe section, Acoustic boards)

TWIGA Overview of Twiga


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Glass Wool vs. Rock Wool

U.P TWIGA FIBERGLASS LTD.

Mineral WoolBasic Product Difference

Thermal Properties

Acoustic Properties

Physical stability / Product Life

Ease of Application


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Mineral Wool !! What it is -

Mineral Wool (IS 8183) : Def- “ Mineral wool made from rock, slag or glassprocessed from molten state into fiber form”

Glass wool

(IS 8183 Gr-1): Density-

12 – 50 Kg/cu.m

Rock Wool/Slag wool

(IS 8183 Gr-2,3,4) Density: 51-

160

Slag wool ( with high slagcontent from steel

industry)- Available in India

Pure Rock based stone wool

is not available in India

Due to lack of awareness Mineral wool in India is perceived only as Slag wool

irrespective of brand or technical specification. So in tender specifically Glass wool

should be mentioned to avoid any other type of Mineral wool. Whenever Mineral wool

wool is mentioned contractors go for slag based cheap products only to reduce cost

and hence dilute the specification.


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Basic Material DifferenceMicroscopic Image of Glass Wool at 100X

Long Fibers, No Shots, No unfiberizedlump,100% Pure Fibers


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Basic Material difference: Rock Wool

Microscopic Image of Rock Wool at 100X

Short-thick Fibers, Shots presents, Unfiberized lump, Impure Fibers


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Thermal Properties

Thermal Parameters Glass Wool(GW) Rock Wool(RW)

Thermal Conductivity

(W/m.K), K-value at 25C

mean

GW-16Kg/cu.m : 0.039

GW-24Kg/cu.m : 0.033

RW-48 Kg/cu.m: 0.039

RW-64 Kg/cu.m: 0.034

Thermal Resistance, R-

value in SI (sq.mK./W)

GW-16Kg/cu.m-100 mm :

R(SI)-2.56 sq.m.K/W


R(SI)-3.03 sq.m.K/W

RW-48 Kg/cu.m-100mm:

R(SI)-2.56 sq.m.K/W

RW-64 Kg/cu.m:

R(SI)-2.9 sq.m.K/W

Thermal Transmittance,

U-value in SI (W/sq.mK)

Insulation alone


U(SI)-0.36 W/sq.m.K


U(SI)-0.31 W/sq.m.K

RW-48 Kg/cu.m-100mm:

U(SI)-0.36 W/sq.m.K

RW-64 Kg/cu.m:

U(SI)-0.32 W/sq.m.K

Inference: (1) To have same thermal property Rock wool require at least 3X more density

than Glass wool. (2) 18% higher thermal resistance than Rockwool with 50% less

density/mass with Glass wool


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Acoustic ParametersAcoustic Glass Wool (GW) Rock Wool (RW)

NRC GW-24 Kg/cu.m-50mm: 1.00

GW-32 Kg/cu.m-50mm: 1.05

GW-64 Kg/cu.m-50mm: 0.76

STC Glass wool being high absorptive,soft and resilient material have

better sound isolation.

Example -

Glass Wool-20Kg/cu.m-50 mm

with both side 12 mm gypsumboards Or. 8 mm Cement board :

STC: 49 - 50

Rock wool being less absorptiveand having short, rough, and

brittle fibers don’t have efficient

sound isolation at densities less

than 60.

Example-

Rock wool* -60 Kg/cu.m 50 mm

thickness with both side 12 to

18 mm thick Gypsum board –

STC: 50 (Ref: PROMAT- high

standard european stone wool),

Indian make rock/slag woolcannot match this performance).

For similar STC value Glass wool requires only 1/3rd of the density of Rockwool.


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Physical stability / Product Life

Stbility,

Corrosion,Product Life

Glass Wool (GW) Rock Wool (RW)

Performance

under Vibration /

Jolting

No settlement of fibers, the

resilient fibers acts as ‘spring’s

to absorb the vibration. Popular

use- Bus, Trains, metro railcoaches.

RW fibers settles in when applied

vertical cavity. The unfiberised

part plays as sand paper and

make dust out of the fiber

Corrosion No slag, sulphur, cloride. Pure

inorganic Glass fibers. Don’t

have any corrosive element

20-30% slag with impurities like

sulphur, cloride makes the

product corrosive in nature

Reusability High reusability as the producthave long and efficient Life

cycle.

Usability ends fast with physicaldeterioration.

Moisture

management

Hydrophobic. Vapour barrier like

Aluminum based FSK,

Polypropylene based WMPVR,

WMP-10, Ultimate White,

Aluglass etc are applied

Mainly wrapped in Plastic bags.

Limited use of Aluglass and FSK.

E f A li i


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Ease of ApplicationParameter Glass Wool (GW) Rock Wool (RW)

Physical form Flexible long blanket 15 m to 30 m long. Or.

Panel form- 0.9m x 0.6m; 1.2mx 1.2m , 0.6mx

1.2m

Roll length max. 7.5m, only

available in panel form

Facing Tabs 50 mm facing extension on single or bothside of

the blanket or 100 mm tab on single side tostaple over the purlin (PEB application)

Normally used with

combustible polythylene.Rarely FSK is used. Need

highstrength covering to

reduce sagging effect.

Bending

around the

corners

Easy to bend and wrap as GW is flexible. Non flexible cannot be bend

efficiently without damaging

the materials at corner

Weight As low as 0.6 Kg/sq.m with 12 Kg/cu.m density

products.

Heavy weight – at least 2.4

Kg/sq.m. (4 X higher than

GW)

Cutting and joining

Easy to cut with knife and compatible withvarious adhesives, self adhesive aluminum

tapes, and industrial staple pins, polyamide

fasteners etc.

Brittle fibers create morewastage and dust during

cutting. Never applied with

adhesive.


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TWIGA Twiga Insul - Application

Duct Insulation-

Thermal

Duct Acoustic

Underdeck Wall Insulation

Partitions insulation False Ceiling

Pre Engineered

Building

Façade/ Spandrel

Insulation

Rail/Metro rail Coach-

wall/roof/HVAC

Bus body

insulation

Shipbuilding-

MFMB/MFRB insulation

Prefab/ non metallic

ducting


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drywall aocustic insulation analysis 2015

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