Roofing Calculator

Do you want to determine the minimum NCC Deemed-to-Satisfy (DTS) performance for your project?
Select Building Class Building class info.
Select State or Territory
Select Nearest Location
Select Roof
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Please refer to the energy assessment for your project for thermal performance requirement targets.
Roof Pitch Roof Pitch must be between 1 and 30.
What is your ceiling Type?
Do you have Vents on the roof?
What is your Roof Structure?
Is the roof being built in a Cyclonic Zone?
What is the average spacing of your purlins in mm?
Are you Building with Timber Frame or Metal Frame?
What is your timber truss spacing in millimeters?
What is your truss spacing in mm?
What is your rafter spacing in millimeters?
What are your Rafter Width?
What are your Rafter Depth?
Add roof elements:
Input Material R-Value
Summer Winter
Outdoor Air Film {{result.OutsideAirFilm.Summer}} {{result.OutsideAirFilm.Winter}}
Metal Roof {{result.RoofType.Summer| number:2}} {{result.RoofType.Winter|number:2}}
Air Cavity {{result.FirstAirSpace.Summer| number:2}} {{result.FirstAirSpace.Winter| number:2}}
Roof Insulation or Sarking {{result.RoofInsulationType.Summer| number:2}} {{result.RoofInsulationType.Winter|number:2}}
Roof Cavity Roof Cavity must be greater than or equal to 20mm. {{result.SecondAirSpace.Summer| number:2}} {{result.SecondAirSpace.Winter| number:2}}
Ceiling Insulation {{result.CeilingInsulationType.Summer | number:2}} {{result.CeilingInsulationType.Winter | number:2}}
Ceiling Lining {{result.CeilingLiningType.Summer | number:2}} {{result.CeilingLiningType.Winter | number:2}}
Indoor Air Film {{result.InsideAirFilm.Summer | number:2}} {{result.InsideAirFilm.Winter | number:2}}
Total R-Value {{result.SystemThermalPerformance.Summer | number:1}} {{result.SystemThermalPerformance.Winter | number:1 }}
DTS System Requirement {{formData.DTSSummerValue}} {{formData.DTSWinterValue}}
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Compiled roof