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Purlins are the carriers that carry rafters on the roofs and are placed perpendicular to the rafters of at least 10x10 cm dimensions. Purlin roof detail is created with the purlin command.

Location of Purlin Command

In the Architectural Program

You can access it under the ribbon menu Home tab Roof title.

In Structural Program

You can access it under the ribbon menu Objects tab Roof title.

Purlin Settings Dialog



The width of the purlin section is entered.


The height of the purlin section is entered.


The distance of the purlin from the roof eaves is entered.


Purlin's elevation is entered. The elevation of the purlin is automatically adjusted to be tangent under the rafters according to the entered distance. The value entered here is used to raise the purlin up or down from this automatically calculated elevation. If the elevation is zero, the purlin will touch the lower surface of the rafters. If a positive value is entered, the purlin will move up, if a negative value is entered, the purlin will move down.

Apply to all edges

If apply to all edges option is marked, purlins will be created on all roof surfaces according to the entered parameters.

Usage Steps

To draw a purlin:

  • Click the Purlin icon in the ribbon menu .

  • Click with the left mouse button on the roof eaves you want to create a purlin.

  • The purlin dialog will be displayed. Make the necessary settings here and press the OK button.

  • The purlin drawing will be completed.

  • Create the purlins for all roof surfaces with the above process order..

Usage step

Selecting roof eaves while on purlin command

Purlin previews occur

Making settings in the purlin settings dialog - entering the purlin distance 50

Preview changes according to distance entered

The formation of purlins

Next Topic

Fascia Board

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