Revit Roof slope can seem complicated at first glance, but by learning a few critical features, you can create any roof shape you desire. Whether you want a double-gable roof with 6 pyramid-shaped dormers or a simple gambrel roof, the basics remain the same.

1- Check Define Slope to Create a Sloped Roof

Want to create a sloped roof ? In the option bar, make sure Define Slope is activated for boundary lines. If slope is activated, a triangle symbol will appear next to each boundary.

To create a hip roof (4-side slope), define slope for all boundaries. To create a gable roof (2-side slope), remove slope for half the boundaries.

2- Modify Properties to Adjust Roof Slope

Click on a roof and change the angle in the Slope Properties. You can use any units, like % and ratios (1:10). They will be converted to the default units, angles in this case.

3- Modify Each Boundary Line to Get Irregular Slope

Want an odd shaped roof? You have to edit the roof boundary and change the slope for each individual boundary line.

4- Activate Overhang on Picked Walls Roofs

Use Pick Walls if you want the roof to automatically adjust when walls are moved. You can set an Overhang on roofs created with Pick Walls. Select each boundary line and set the value in properties or in Option Bar.

5- Set Cutoff Level to Cut Roof Horizontally

In the properties, set a cutoff level to cut the roof horizontally. This can be used to create a gambrel roof and other roof type where the slope is interrupted.

6- Join Roofs and Add Opening to Create Dormer

To create a dormer, model required walls and additional roof. Then follow these 2 steps:

Use Join/Unjoin Roof tool: This tool is located in the Modify tab. Use it to extend the dormer roof to the main roof.

Create a Dormer Opening: Located in the Architecture tab, this tool is used to create a dormer shaped hole in the main roof. Select the main roof, then click on dormer walls and roof. Click the green check to complete the opening.

7- Use Slope Arrow for Odd-Shaped Roof

To create a slope for an odd-shaped roof like the one below, use Slope Arrow. Draw the arrow, then click it and change the properties to select the right levels and offsets. The tail is the low point and the head is the high point. This create an uni-directional slope parallel to the arrow. Make sure Define Slope is inactive and that the arrow lies on the boundaries.

8- Select Cut Type

What shape do you want the end of your sloped roof to be? Select the roof and choose between Raft Cut and Two Cut in roof Properties, under Rafter Cut parameter. If you use Two Cut, you have to set a Fascia height, like illustrated below.