Project Description
Construction cost was reduced by keeping existing walls from new works (insulation). This was done by decreasing averaged U value from 3.8 to 2.4 and by adding 12% more insulation to the walls and 6% more insulation to the ceilings.
Existing dwelling (class 1a) is located in the city of St Kilda. With new extension to the existing building, it consists of 2 levels with net conditioned area of 259m2.
Through VURB method we managed to keep the existing walls from new works (adding insulation) and managed to keep the existing windows and roof lights as well.
Here are some more details on the degree of insulation and glazing thermal performance for the St Kilda project:
| Item | NCC 2016 Reference Building | Proposed Building |
| Floor | R1.35 added to the suspended timber floor above enclosed subfloor No insulation added to slab on ground (living) No insulation added to concrete slab on ground slab R1.0 added to the slab edges No insulation added to the intermediate floors |
R2.5 added to all existing ground level suspended timber floors above subfloor R1.8 added to slab on ground (living) R1.8 added to slab on ground (garage) No insulation added to the slab edges No insulation added to the intermediate floors |
| Internal and common walls | No insulation added to all new internal walls. No insulation added to the common wall. |
R2.5 added to the new internal walls. No insulation added to the common wall. |
| External walls | R2.23 added to the external rendered brick veneer walls, Solar absorbance: 0.4 R2.23 added to the external brick veneer walls, Solar absorbance: 0.9 R2.58 added to the external metal clad walls, Solar absorbance: 0.9 R2.23 added to the external weatherboard walls Solar absorbance: 0.4 |
R2.5 added to the external rendered brick veneer walls Solar absorbance: 0.4 R2.5 added to the external brick veneer walls, Solar absorbance: 0.9 R2.5 added to the external metal clad walls, Solar absorbance: 0.9 R1.0 added to the new external weatherboard walls Solar absorbance: 0.4 No insulation added to the existing external weatherboard walls Solar absorbance: 0.4 |
| Roof/Ceiling | R4.71 added to the plasterboard ceilings under retained pitched roof, Solar absorbance: 0.55 R4.71 added to the flat and cathedral plasterboard ceilings under new pitched roof Solar absorbance: 0.73 |
R5.0 added to the plasterboard ceilings under retained pitched roof, Solar absorbance: 0.55 R5.0 added to the flat and cathedral plasterboard ceilings under new pitched roofSolar absorbance: 0.73 |
| External shading | All external eaves and have been incorporated into the analysis based on available drawings. | No new shading proposed |
| Glazing | All ground level windows: U-Value: 3.95, SHGC: 0.77 All upper level windows: U-Value: 3.67, SHGC: 0.81 Existing skylight: U-Value: 4.3, SHGC: 0.54 New skylights: U-Value: 2.9, SHGC: 0.29 |
All existing timber DG windows: U-Value: 3.0, SHGC: 0.56 Existing timber SG skylight: U-Value: 5.4, SHGC: 0.56 All Res series 516 DG windows (Fixed): U-Value: 2.33, SHGC: 0.4 All UPVC DG windows (Awning): U-Value: 1.89, SHGC: 0.23 All Thermal heart DG windows (Awning): U-Value: 2.93, SHGC: 0.45 All Res series 616 DG windows (Fixed): U-Value: 2.72, SHGC: 0.51 All new Velux VS DG skylights: U-Value: 2.61, SHGC: 0.21 |
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.