By specifying COLORBOND® Coolmax® steel roofing

Project Details:

Conditioned Floor Area (m2)

Note: For multi storey construction use the upper storey air-conditioned area only.

Comparison to

Guiding Factors on High End vs Low End of Savings:

Insulation Low insulation tends to higher potential savings
HVAC air delivery Air delivery near roof tends to higher potential savings
Location Location tends to higher potential savings

Guide to possible 10 year cooling savings†:

Saving Public Domain BlueScope Steel Building Study
10 years 5 years 10 years 5 years
Low $18,225 $11,962  
Average $30,750 $18,225 $47,891 $28,036
High $68,325 $37,012  

† Assumptions

  • Based on simple addition of potential upfront HVAC cooling equipment saving and potential annual cooling energy savings.
  • The roofing area is comprised entirely from COLORBOND® Coolmax® steel.

Public domain savings

  • Light to dark roof (solar reflectance change of 60%) provides cooling savings ranging from 10 to 50% (20% average).
  • Annual cooling cost of $8.35 / m2 (42 kWh/m2/year @ 20 c/kWh).
  • Includes HVAC cooling equipment saving valued at $300 / kWh.

BSL building study savings

  • Insulated to medium insulation level (R3) and has no air delivery system in the roof space or near the roof.
  • Electricity costs at 20 c/kWh.
  • Includes HVAC cooling equipment saving valued at $300 / kW.

Note: Cooling energy savings will vary considerably as each building is unique in its construction and operation. Factors such as the amount, quality and installation of roof insulation; the type and efficiency of HVAC equipment; and the presence of ducting within or near the roofspace will also influence potential savings. No savings are possible for buildings without mechanical cooling, however the building will be cooler in hot weather.