Project Description

Glazing cost was reduced by increasing U value from 1.5 to 3.7. This was achieved by adding 115% more insulation to the floor and 53% more insulation to the ceilings.

Proposed residential (class 1a) is located in the city of Bittern. It consists of 1 level with a net area of ?m2.

Through VURB method we managed to reduce overall glazing U-value by more than 30%.

Here are some more details on the degree of insulation and glazing thermal performance for the Bittern project:

Item NCC 2016 Reference Building Proposal Building
Floor  R1.9 added to the suspended floor R6.0 added to all suspended floors.
Total R-Value: R6.35
Internal and common walls For internal walls, no insulation is required.
Solar absorbance for all plaster/gypsum finishes: 0.4
As per reference case.
External walls R2.32 added to the external walls
Solar absorbance: 0.6
R5.0 Insulation added to all new weatherboard walls,
Total R-Value: R5.48R4.0 Insulation added to all existing
Roof/Ceiling R4.56 added to the ceiling and roof
Total R-Value: R5.1
Solar absorbance: 0.6
R7.0 insulation added to all ceilings to have Total roof/ceiling R-Value: R7.54
Solar absorbance: 0.6
External shading Shading from other buildings and external eaves have been implemented into the analysis based on available drawings. New awning added with P=0.8m & H=0.65
Glazing All Doors:
U-Value: 1.94, SHGC:0.66South-facing window:
U-Value: 1.0, SHGC: 0.1East-facing window:
U-Value: 1.46, SHGC: 0.73
Door opening to Sitting room:
U-Value: 3.7, SHGC: 0.56Door opening to Bedroom:
U-Value: 3.7, SHGC: 0.81All windows:
U-Value: 3.7, SHGC: 0.56


If you would like to save on your building construction costs, contact our team at Energy Compliance and one of our friendly staff will discuss the opportunities to save in your costs. Energy Compliance offers a unique service guarantee:
If we can’t reduce your construction costs by more than twice the value of our service fee, and you decide not to use our report, then you won’t have to pay the remainder of our invoice.