# 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 %}

![](https://239424168-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FqtUsszuAWXIZhQhrvjnb%2Fuploads%2Fvm4WYmRWlKI0qmqmToyp%2F0.jpeg?alt=media)

![](https://239424168-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FqtUsszuAWXIZhQhrvjnb%2Fuploads%2Fm8Aolj7t9JOn3Rj4xj1R%2F1.jpeg?alt=media)

{% 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.

![](https://239424168-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FqtUsszuAWXIZhQhrvjnb%2Fuploads%2FCTrIbgxZGeowF1O3aMOv%2F2.jpeg?alt=media)

{% 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;

![](https://239424168-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FqtUsszuAWXIZhQhrvjnb%2Fuploads%2FGC6Q0LDge3fGxldu3eqd%2F3.jpeg?alt=media)

* 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)

![](https://239424168-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FqtUsszuAWXIZhQhrvjnb%2Fuploads%2FrWYfHwxFA5Af1cMRsR1l%2F4.jpeg?alt=media)

![](https://239424168-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FqtUsszuAWXIZhQhrvjnb%2Fuploads%2FoICmhnOX1cncUvSmxKzX%2F5.png?alt=media)