When you create floors in Revit, by default, they are flat. But you can create sloped floors and slope portions of floors using a variety of methods.
In this project, there are multiple floors already created. Select the floor on the far right. The ribbon changes to the Modify|Floors contextual ribbon. In the Mode panel, select Edit Boundary to enter into sketch mode. In the Draw panel, there is a Slope Arrow tool. When you are creating or editing floors, you can add a slope arrow to slope the floor. You can also choose a floor boundary line to define a slope.
For example, select the left boundary line. Then on the Options bar, select Defines Slope. When you do, a slope icon appears next to the boundary line and you can set the Slope in the Properties palette. If you wish to change the units in which the slope is defined, navigate to the Manage ribbon. In the Settings panel, click Project Units. In the Project Units dialog, click the button in the Format column next to Slope. This opens the Format dialog, and you can choose another type of Units for the slope, such as a ratio, a rise per run, degrees, or percentage. Click Cancel to close each dialog.
Back on the contextual ribbon, select Finish Edit Mode. To see the results, open the South Elevation view. The floor slopes down from the edge that you selected to be slope defining.
Move back to the Level 1 floor plan view. Select the floor to the left of the one you just modified and choose Edit Boundary. In the Draw panel, click Slope Arrow. In the Draw gallery, there are two options: sketch lines or pick lines. Leave the Line option selected. When sketching a slope arrow, the first pick will place the tail of the slope arrow, and the second pick places the head. The slope arrow does not have to be parallel to an edge. For this example, pick the lower-right corner of the floor boundary, then pick the upper-left corner to place the arrow, and then click Modify.
Next, select the slope arrow. In the Properties palette, pay attention to the properties of the arrow. In the Specify field, you can choose to define the slope in one of two ways: Height at Tail or Slope. When you choose Height at Tail, you can set the level and the height offset from that level for both the tail and head of the arrow. You can select the level from a drop-down or leave it set to Default, which is the associated level of the current view.
When you choose Slope, you can set the Level at Tail and Height Offset at Tail, and then assign the Slope as per the project units. Choose Height at Tail and then click Finish Edit Mode.
Open the South elevation and East elevation views to see the results. Use the keyboard shortcut W, T to tile the views and then Z, A to zoom all to fit.
In the plan view, select the floor you just modified and click Edit Boundary again. Then select the slope arrow and drag both the head and tail about 3 feet (or 900 millimeters in the metric file) inside the floor boundary without changing the angle. Once you complete this, click Finish Edit Mode.
When you specify the slope using Height at Tail, realize that shortening the slope arrow will have the effect of making the floor steeper, because the location of the slope arrow end points sets the height of the floor at those coordinates.
Next, zoom in to the two floors on the left. The far left floor has been placed at a Height Offset of 1 foot (or 300 millimeters in the metric file). Create a sloped floor to join the two floors. To do this, select one of the floors. Then on the Modify|Floors contextual ribbon, in the Create panel, select Create Similar. In the Draw gallery, click Rectangle and then pick the upper-right and lower-left points of the space between the two floors.
Next, in the Draw panel, select Slope Arrow. Pick the midpoint of the left side to place the tail and the midpoint of the right side to place the head. Then, in the Properties palette, verify that the Height Offset at Tail is set to 1 foot (or 300 millimeters) and that the Height Offset at Head is set to 0. Then click Finish Edit Mode. In the South elevation view, verify that the new floor joins the others correctly.
Finally, you can use the Join Geometry tool on the Modify ribbon to join the floors in order to eliminate the edge lines.