# Insert Valley Set Grid

* Select a truss system grid (which doesn’t belong to the main roof)
* Select **Insert Valley Set Grid** directly from **Truss+** menu
* A valley set grid will be automatically created

{% hint style="info" %}
**Note:** Roof with a lower ridge is not the main roof
{% endhint %}

![](/files/ccbo074vZ63TL5f17cZ3)

* It’s not possible to insert the valley set grid to the main roof, as the main roof doesn’t need the valley set grid
* If the selected grid belongs to the main roof, an error message will occur

![](/files/JWvwPe9qL1ROveithMhH)

* To change a parameter of the main roof:
* Click **OK** to close the error message
* Select the truss system grid and go to **Modify Truss System Grid**
* Uncheck the option **Valley trusses will not be used** and click **OK**

![](/files/R2Bnf6VLEZUki1dRzdE8)

![](/files/yoD8bLj94h2Aa8lqW3eS)


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