Specify a Roof



The layout of a roof refers to the arrangement or configuration of its components, including the Roof Type and Roof Offset. The Roof Type determines the type of surface generated for your Roof. Additional options are presented for each type. The Roof Offset enables the Roof Line to be directly offset.


The pitch of a roof, also known as the roof slope or roof angle, refers to the steepness or inclination of the roof surface. The Slope Method, Heading, Roof Height and Ridge Offset can all be set. The Slope Method determines how the pitch(es) are calculated for the Roof, while the Heading nominates the degrees from true North for the slope of the Roof surface. Roof Height nominates the height of the roof at its apex, while the Ridge Offset nominates the position of the ridge for Double-pitched roofs.


In the context of a roof, a cavity refers to an empty or void space between different layers or components of the roof structure. Currently, the only input that can be adjusted that impacts the performance of the building is air changes within the roof space, measured in Air Changes / Hour.


The eaves of a roof are the horizontal, projecting edges of a roof that overhang the exterior walls of a building. They extend beyond the walls and protect from rainwater, directing it away from the building. Eaves can be set as typical projects in meters. Where custom eaves are required, eaves are also drawn on Aspects.


All roofs default to the assumption that they are insulated at the ceiling line, with an unconditioned zone representing the roof. The following Envelope options are available that allow a flexible consideration for the nomination of Total R-value and Solar Absorptance.

Insulated Surface: Refers to a roof surface that is specifically designated for insulation purposes. By default, it utilises the settings specified for the overall roof envelope.

Enclosure Surface: This surface is used to enclose any cavities that may exist within the roof structure. In the case of cold roofs with a cavity, the enclosure surface represents the outer shell of the roof. Warm roofs represent the surface of the ceiling.

External Ceiling: This surface is an optional element that can be defined to represent external ceilings. If not explicitly defined, the insulated surface is used for this purpose.

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