Cost saving analysis

The following provides an explaination for the cost savings that can be achieved with Earthwool OmniFit.

Earthwool OmniFit v Rock mineral wool

Rock Mineral Wool Earthwool OmniFit
Thickness (mm) Density (kg/m³) R-Value (m² K/W) Weight per Area (kg/m²) Thickness (mm) Density (kg/m³) R-Value (m² K/W) Weight per Area (kg/m²)
50 60 1.5 3.0 50 16 1.4 0.8
50 80 1.5 4.0 50 24 1.5 1.2
50 100 1.5 5.0 50 32 1.5 1.6
75 60 2.2 4.5 75 16 2.0 1.2
75 80 2.2 6.0 75 24 2.2 1.8
75 100 2.2 7.5 75 32 2.3 2.4

Highlighted Example:

To achieve an R-1.5 with Rock mineral wool you require 4.0kg/m²
To achieve an R-1.5 with Earthwool OmniFit you require 1.2kg/m²

Based on the fact that raw material is traditionally* the same price per kilogram for either rock or glass mineral wool, substituting Earthwool OmniFit for rock mineral wool represents a saving of ~70% in this case.

 
Earthwool OmniFit v Rock mineral wool

System Insulation options Sound Reduction Saving
(%)
Plasterboard thickness (mm) Number of layers Stud size (mm) Overall partition width (mm) Rock mineral wool 40kg/m³ 50mm Earthwool OmniFit 50mm Earthwool OmniFit 75mm STC rating Approximate saving by using Earthwool OmniFit
12.5 1 50 75 • •   42 ~35%
15 1 50 80 • •   42 ~35%
12.5 2 50 100 • •   50 ~35%
15 2 50 110 • •   52 ~35%
12.5 1 75 100 •   • 44 ~25%
15 1 75 105 •   • 44 ~25%
12.5 2 75 125 •   • 52 ~25%
15 2 75 135 •   • 55 ~25%

Highlighted Example:

To achieve a an acoustic performance of STC 42 you require:
2.0kg Rock mineral wool per m²
1.2kg Earthwool OmniFit per m²

Based on the fact that raw material is traditionally* the same price per kilogram for either rock or glass mineral wool, substituting Earthwool OmniFit for rock mineral wool represents a saving of ~35% in this case.

*Price comparisons based on Singapore’s average retail rock mineral wool selling prices in August 2014 (exc. GST).