7I

ACOUSTIC LABORAIORIES

Report ALA05-082-la

Unit 3/2 Hardy Sfeet

South Perth 6151

Telephone | 9474 4477

Facsimile: 9474 5977

ABN 34 092 729 550

Determination of the Wall lmpact Sound Rating

Formcraft Insulated Goncrete Wall

Tested to2004 BCA Specification F5.5

Formcraft Pty Ltd3/34 Truganina Road

Malaga 6090

10 March 2006

Client: FormcraftReport No.: 06{82-1

Date: 10-Mar-06Page 2 of 5

1 � TEST OBJECTIVE

Formcraft Pty Ltd commissioned the Acoustic Laboratories Australia to measure theImpact Sound transmission for an insulated concrete wall. The purpose of the testwas to determine the Weighted Normalised Impact Sound Pressure Level for theconstruction, ard compare the result with tests carried out in the same laboratory fora masoffy cavity wail that complies with the discontinuity requirements of the 2005Building Code of Australia.

The tests were carried out at the Heafod Laboratory facility in Bayswater, WesternAustralia. The sample under test was mounted in a vertical aperture between twoside-by-side reverberant rooms. The method of test is based on ISO 140-6(Laboratory Measurement for Impact Insulation of Floors) adapted for walls. Thetest was carried out in accordance with Building Code of Australia SpecificationF5.5 Impact Sound - Test ofEquivalence.

DESCRIPTION

2.I Test Sample

Sample Size: 3,730mm wide by 2,640mm high Total area: 9.85m2

Description:o 13mm plasterboard fixed with daubs ofglue, and screwed too 50mm polystyrene formwork at 26 Kg/m" densityo 120mm in-situ Concrete (25 mPa, 120mm slump, 10mm aggregate)o 50mm polystyrene formwork at 26 Kg/m" densityo 13mm plasterboard fixed with daubs ofglue, and screws

The sample concrete was installed on February 15, and tested on February 19,2006

2.2 Installation of the Sample:

The sample was tested by installing the polystyrene permanent formwork in theaperture between the two side-by-side reverberant rooms in the test facility. Thesample was installed on one side of the break in the structure between the tworeverberant test rooms. The concrete was poured into the polystyrene formwork towithin 80mm ofthe top of the laboratory opening. The opening between the top ofthe concrete and the top of the test opening was then filled with compressedfibreglass insulation.

The test wall was then clad on both sides of the wall with i3mm plasterboard fixedwith daubs of glue and screw fixed to the polystyrene formwork. An additionallayer of 13mm plasterboard was then installed at the top ofthe panel to the extent ofthe fibreglass fill. The edges of the panel were then sealed to the laboratory testopening.

06-082 Formcraft Impact test-1.doc

2.

ACOUSTIC LABORATORTES AUSTRALIA Fty Ltd

Client: FormoaftReport No.: 06-082-1

Date: l0-Mar-06Page 3 of 5

3. TEST FACILITIES

size of test Rooms: The test facilities are constructed of reinforced concrete andare structurally isolated from each other. The rooms are parallelepiped with areverberant source room volume 81m3 and a reverberant receiver room volume of208m3. An adequate number of room modes exist in accordance with clause A3.1.2above 726 Hz for the Source room and 92 Hz for the Receiver room.

Acoustic Diffusion: Sound difi.rsion is achieved by the location of large 19mmstructural ply panels randomly oriented and freely suspended.

Acoustic diffirsion is prwided in the Receiving Room by 6 panels of 1.44 m2 each,and 7 panels of 2.88m' each. Total area (two sided) of panels is 5l.gm2. being24 .3yo of the of the total surface area of the room.

The Source Room has additional acoustic diftrsion provided bv 6 panels of 1.44 r*.Total area (two sided) of panels is 17 3rrt; being 15.S% of the of the total surfacearea ofthe room.

Acoustic Absorption: The average absorption coefficients of the diffi:sersand the internal surfaces ofthe room is less than 0.06 in each test frequency band.

4. TESTPROCEDURE

Test Equipment:Norwegian electronic Tapping Machine Nor211A Serial No.25180B&K Analyser Type2260B&K Microphone Type 4189B&K Calibrator Tvoe 4230

Serial No 172181 - (Cal:25/1106)Serial No 17 83702 (Cal: 25/ 1/06)Serial No 724157 - (Cal:7/2/06)

Yamaha P3200 Stereo Amplifier Type 3600 - 400 watt / channelLorantz SpeakersVaisla HM34C Humidity & Temperature Meter Serial No: V2910014

Generation of Sound Field: The test procedure involves mounting astandard Tapping Machine on a horizontal steel platform with a 510mm long by10mm thick face resting up against the wall in the source room. Two legs at 600 tothe floor support the horizontal steel platform so that half the force imposed on theplate is transfened to the wall via the long edge ofthe plate. The legs rest on lOmmEmbelton Impacta-Mat to reduce transfer of impact energy into the concrete floor ofthe chamber and avoid slippage ofthe test platform.

Source and Measarement Positions: The horizontal steel platform waslocated against the wall specimen at three locations in the source room. The noiselevel in the receiver room was measured in one third octave bands at 4 microDhonepositions for each sound source position.

Frequency Range: Measurements were taken in 1/3 octave bands from 100 FIz to3.150 Hertz.

Meavrement of Equivalent Absorption: The equivalent absorption wasdetermined in accordance with ISO 140-6 from the measured Reverberation Times.

06-082 Formcrai ImDact test-1.doc

ACOUSTIC LABORATORIES AUSTRALIA ftv Ltd

Client: FormcraftReport No.: 06-082-1

Date: 10-Mar-06Page 4 of 5

The Reverberation Time in the receiving room was measured using two sourcepositions and 6 microphone positions, providing 12 independent source /microphone positions. 5 decays were measured at each microphone position.

Background Noise: The sound levels of the tapping machine in the receivingroom were at least 10 dB above the Backeround noise level in all relevant freouencvbands.

Air b orne No i se Transmi ss i on'. The noise source was measured in the sourceroom by means ofa sweep ofthe volume ofthe source room.

The airborne sound transmission of the noise of the tapping machine on the steelplatform through the wall was determined for each of the 1/3 octave frequencybands. The results ofthe airborne sound insulation test ofthe wall were used in thecalculation. The airbome sound transmission of the tapping machine noise sourcethrough the wa[[ was determined to be more than 10 dB below the measured noiselevel of the tapping machine in all frequencies except 250 Hertz where thedifference was calculated at 5.4 dB. An adjustment was made in this 1/3 octavefrequency band in accordance with Clause 6.4 ofISO 140-6.

5. RESULTS

The Normalised Impact Sound Level was determined in accordance with ISO 140-6.To rate the impact sound insulation of the wall the results of the measurements werecalculated as a single figure rating (L'.*) in accordance with ISO 717-2. The (L,"*)is the Weighted Normalised Impact Sound Pressure Level normalised using areference equivalent absorption area (A) of 10m'. The Formcraft insulated concretewall achieved a Ln,* of 51 dB.

In comparison a cavity brick wall consisting of 90mm bricks with 70mm cavity withMatrix resilient ties, rendered on both sides achieved a L^* of53 dB. This indicatesthat the Formcraft wall as described above achieves slightly improved impactisolation performance compared to the 90-70-90 cavity brick wall with resilient ties

l "Z"; , t \ . . . . . . , . Da'e . . . .?- . f . : . .E. . : d/- . . .Ifcopie4 this report must be reproduce-d in full

06-082 Formcraft Impact test-l.doc

ACOUSTIC LABORATORIES AUSTRALIA Pty Ltd

WALL IMPACT SOUND INSULATION - NORMALIZED

Unit 3/2 Hardy StreetSouth Perth 6151

'lel: 9474 4477Fax'.9474 5977

Project No: 06-082-1 DATA SHEETProject: Formcraft wall

Specimen: 120 concrete + polystyrene pemanent formworkDetails

Description of Specimen: Meas. Date: 2006 Feb 19Tapping Machine: NE Nor 211

13mm plasterboard fixed with daubs of glue, and screwed to sLM: B&K 2260 Invest50mm polystyrene @ 26 Kg/m3 Receiving Room

120mm concrete toO 40mm below top of test opening volume:50mm polystyrene @ 26 Kg/m3 No. of Source posn:

13mm plasterboard fixed with daubs of glue, and screwed "**", H;.;:::;

209 m3

1 212 positions

Weighted Normalized lmpact SPLResults normalised to a 10 mZ absorption

Ln,w 51 tso 140-7:1998 & 717-2:1996

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100't25

1602002503 1 5400500630800

1 k1 .25k1 .6k

?k2.5k

3 .15k

36.4 5340.5 5346.9 5345.6 5347 .3 5360.6 5359.0 5249.7 5146.8 5044.7 4941 .8 4840.1 4539.0 4240.1 3940.1 3644.5 33

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1 .'l4 . 11 1 . 5

NORMALIZED IMPACT SOUND PRESSURE LEVEL

.S {f .e "s .'f "& os oS oiF os .**f* ;9s r,\ "9\^f\

1/3 Octave Band Centre f.equency HZ

06-082 Formcraft impact test- 1.xls Page 5 of 5