The UNDERSIDE OF LEVEL 1 CAR PARK CONCRETE SLAB* will be sprayed with Envirospray 300 available from;
Enviro-Acoustics Pty Ltd
The nominal thickness will be "50mm" in Colour "STEEL GREY" to achieve the following minimum absorption coefficients
| 125Hz | 250Hz | 500Hz | 1k Hz | 2k Hz | 4k Hz |
| 0.26 | 0.68 | 1.0 | 1.0 | 1.0 | 0.98 |
All unsprayed adjacent surfaces will be protected with masking and adequate time will be allowed for proper curing and adhesion. ENVIROSPRAY 300 will be installed by an approved applicator who will certify the application for the following:
- Compliance with the Building Code in respect to Fire Indices
- Compliance with the Acoustic Specification as noted above
Adhesion and performance warranties will be provided for a minimum of "10 YEARS" from the date of practical completion of the project.
- Adjust Specification according to actual requirements and conditions.
- If specifying THERMOSPRAY 800, add the following wording "Thermal conductivity of the installation will achieve 0.0384 W/moK or lower and certification of the same will be provided."
Noise Reduction Coefficients
Envirospray 300 Sprayed Acoustic & Thermal Insulation applied on to solid backing
| Thickness | 125Hz | 250Hz | 500Hz | 1k Hz | 2k Hz | 4k Hz | NRC |
| 16mm | 0.05 | 0.16 | 0.44 | 0.79 | 0.90 | 0.91 | 0.55 |
| 25mm | 0.08 | 0.29 | 0.75 | 0.98 | 0.93 | 0.96 | 0.75 |
| 38mm | 0.15 | 0.51 | 0.95 | 1.00 | 0.99 | 0.98 | 0.90 |
| 50mm | 0.26 | 0.68 | 1.00 | 1.00 | 1.00 | 0.98 | 0.95 |
| 63mm | 0.41 | 0.84 | 1.00 | 1.00 | 1.00 | 0.99 | 1.00 |
| 75mm | 0.57 | 0.99 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 |