![pergola rafter spacing pergola rafter spacing](https://cdn.homedit.com/wp-content/uploads/2017/12/air-gap-to-work-in-on-the-rafters-closest-to-the-center-rafter.jpg)
Go to a 3D view to see the beam system clearly.If you would like to edit the boundary of the beam system, then select the beam system -> Under Modify|Structural Beam system tab -> Mode panel -> click on Edit Boundary. TIP: If you would like to edit layout rule, you can select the beam system and adjust its properties in the properties palette.From the Mode panel -> Click Finish Edit Mode.
![pergola rafter spacing pergola rafter spacing](https://i.pinimg.com/originals/7d/c7/f8/7dc7f88051b27fba592ceacd32b0357c.jpg)
Define the distance in the Fixed Spacing parameter as 0.45m (450mm).For this tutorial, choose Fixed Distance from the layout rule. From the properties palette, define the layout rule of the beams.Select one of the shorter sides of the boundary to define the direction of beams to be placed in the beam system. From the Draw panel, select the Beam Direction tool.Use Trim/Extend Single Element tool to trim all the sketch lines in a closed loop as shown in the above image.In the drawing area, select the inner face of the wall on Grid B as shown below.From the draw panel, select the Pick Lines option.In the drawing area, select the three beams as shown below.In the draw panel, select the Boundary Line and Pick Supports option.Select Sketch System (from the Modify|Place structural beam system tab-> Beam system panel).Go to Structure tab -> Structure panel-> Beam System.The wall on Grid B and the existing beam on Grid E shall act as the shorter boundary of the beam system. Now, we have two 100x200mm beams on the longer boundary of the beam system.(To know more about how to place beams, please refer the tutorial Modeling Beams ) Place beams at Grid 6 and 8 at “02 Second Floor Level” elevation with its length extending from Grid B to E, as shown below.Create a new type (by duplicating an existing type) of concrete beam of the size 100mm width and 200mm depth.Before we create a beam system, we must first define the beams on its boundary.Navigate to the floor plan of “02 Second Floor Level”.The tutorial file “TutorialBeamSystem_Input_LearningRevitOnline.rvt” already contains basic model of the building.“TutorialBeamSystem_Input_LearningRevitOnline.rvt”.If you do not have the following files, please download them from here.
![pergola rafter spacing pergola rafter spacing](https://i.pinimg.com/736x/4e/17/42/4e1742d56091b003a68215674e5b2a72.jpg)
Cross beams (pergola frame) in the sample tutorial project Sample Files required for this tutorial: