# Insert Roof/Floor Truss By Selected Model Lines

* Draw Model line in the plan view from one wall core to another wall core (or from-to support elements)
* Start and end points must be in correct positions: middle points (center line) of the heel webs• Select Model line
* Select **Insert Roof/Floor Truss by Selected Model Line** from **Truss+** menu
* Select required truss type from the truss family browser

{% hint style="info" %}
**Note:** start and end points of Model line will also be the start and end points of truss
{% endhint %}

![](/files/Me1yj3MYG19EOvTSCO1z)

![](/files/dV8rAhNtvsAaU3jx7EVy)

{% hint style="info" %}
**Note:** all truss families have a special name and classification. Truss families are classified by type and position in roof layout like Common truss, Gable end truss, Scissors truss etc.
{% endhint %}

All names have a special end like “\_1L+1R” or “\_2L+2R”. Numbers show how many slopes a truss can have in the left “\_XL” “+” and the right “XR” sides of the truss. Inserting a truss by Model line, you must know how many slopes a roof has and use the correct truss family.

![](/files/4flQ2fiAbkAtRnlXDZCg)

{% hint style="info" %}
**Note:** there is no need to draw model lines in every truss location.
{% endhint %}

Use **Copy/Array**… function for truss distribution along the roof;

![](/files/AJKjuViwGZ7CRqk6kF8Q)

* If the roof has more slopes than can be generated by the selected truss family, software shows an error message
* If all trusses that come with software installation don’t have enough panels or you want to distribute truss webs in otherway - use **T4R Truss Builder** (more about **Truss Builder** - refer to the corresponding e-Help section - Create Truss Type by Model Lines)

![](/files/OGcWZDlPQ9MXCE5JuJZU)

![](/files/XiQhlOGpOLrfSYfWLqjp)


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