By Martha Hollowell
This fall I will be blogging about families. My focus is going to be on some of the lesser used but still important types of families including annotations, profiles, and 2D families. I will also be doing a webcast in December about parameters which ties right in with some of these families as well. Most of the information is coming from the Autodesk Revit 2017 BIM Management training guide.
Today I want to focus on creating floor types. Floors, (architectural, structural, and foundation slabs) are system families very similar to walls, roofs, and compound ceilings. System families are created and modified in a project or template file by duplicating an existing element type. For example, to modify a compound floor, you edit the type (as shown below) and select the Structure parameter. This opens the Edit Assembly dialog box which enables you to specify each layer of the assembly.
How To: Create a Compound Floor or Slab
- Start the one of the floor or slab commands.
- In Properties, select a type similar to the one you want to create and click Edit Type.
- In the Type Properties dialog box, click Duplicate....
- In the Name dialog box, enter a name for the new type and click OK.
- Next to the Structure parameter, click Edit....
- In the Edit Assembly dialog box (as shown below), modify the layers of the assembly as required, and then click OK.
- Modify any Type Parameters in the Type Properties dialog box.
- Click OK to close the dialog box
The top of the dialog box lists the Family, the Type name that you gave to the new type, and the Total thickness (which is the sum of the layers defined in the structure). It also includes Resistance (R) and Thermal Mass which are automatically calculated from the materials assigned to the layers.
When you specify the layers for the compound element, you assign them a Function, Material, and Thickness. This is where you can get creative. For example, add a carpet layer that references a specific manufacture’s material choices.
- Use the buttons to insert additional layers and to rearrange them in the layer list. You can also delete layers from the list.
- The Core Boundary function defines the layers above and below the wrapping; a heavier line is displayed when a plan or section view is cut.
- Editing a wall assembly works from the exterior side at the top of the list to the interior side at the bottom. For floors and roofs, you work around the layers above and below the wrap of the Core Boundary.
- Floors and structural slabs (as well as roofs) and have an additional parameter that relates to sloping for drains. When Variable is not selected, the slab is set to a constant thickness and the entire element slopes. When Variable is selected, only the top layer slopes.
Customizing Floors and Slabs
Now that you have the mechanics of how to customize floors in place you can add this to your arsenal of productive Autodesk Revit tools. What types of floors or slabs do you need to customize?