Foundation Slab Properties

You can specify the Structural Usage parameter of a Foundation slab: either Foundation or Slab on Grade. If set to Foundation, the slab will provide support for other elements connected to it. If set to Slab on Grade, the slab will only support itself. The Foundation Slab type also has an additional, read-only parameter, Elevation at Bottom. The Elevation at Bottom parameter is used for tagging the Bottom of the Foundation elevation. You can modify parameter names, values, and descriptions for Foundation Slabs.

Foundation Slab Type Properties

Name	Description
Construction
Structure	Select the Edit button to add, change, or delete slab layers.
Thickness	Slab thickness. This is a read-only parameter.
Graphics
Coarse Scale Fill Pattern	Specifies a fill pattern for a slab in coarse-scale view. Click in the value box to open the Fill Patterns dialog. See View Properties.
Coarse Scale Fill Color	Applies a color to the fill pattern for a slab in a coarse-scale view.
Identity Data
Keynote	Add or edit the slab keynote. Click in the value box to open the Keynotes dialog. See Keynotes.
Model	The manufacturer internal number.
Manufacturer	The slab manufacturer.
Type Comments	A field for placing general comments about the slab type. This information can be included in a schedule.
URL	A link to a web page that may contain type specific information.
Description	Enter or edit the description of the slab.
Assembly Description	Describes the assembly based on the assembly code selection. This is a read-only parameter.
Assembly Code	A Uniformat assembly code selected from a hierarchical list.
Type Mark	A value that designates the specific slab. This value must be unique for each element in a project. Revit warns you when the number value is already used but allows you to continue using it. You can see the warning using the Review Warnings tool. See Reviewing Warning Messages.
Cost	The pricing of the slab.

Foundation Slab Instance Properties

Name	Description
Constraints
Level	Specifies the level that the slab is constrained to.
Height Offset From Level	Specifies the elevation of the top of the slab relative to the constrained level of the slab.
Related to Mass	This is a read-only value.
Structural
Structural	If checked, Slab has an Analytical Model and is exported to analysis packages.
Enable Analytical Model	Displays the analytical model and includes it in analytical calculations. Selected by default. See Disabling the Analytical Model.
Rebar Cover - Top Face	The rebar cover distance from the foundation slab top face. See Rebar Cover.
Rebar Cover - Bottom Face	The rebar cover distance from the foundation slab bottom face. See Rebar Cover.
Rebar Cover - Other Faces	The rebar cover distance from the foundation slab to adjacent element faces. See Rebar Cover.
Estimated Reinforcement Volume	Specifies the estimated reinforcement volume of the selected element. This is a read-only parameter that only displays when rebar has been placed.
Dimensions
Slope	Specifies the slope of the slab from the horizontal plane.
Perimeter	Indicates the slab perimeter. This is a read-only parameter.
Area	Indicates the area of the slab. This is a read-only parameter.
Volume	Indicates the volume of the slab. This is a read-only parameter.
Width	Indicates the width of the slab, if rectangular. This is a read-only parameter.
Length	Indicates the length of the slab, if rectangular. This is a read-only parameter.
Elevation at Bottom	Indicates the elevation used for tagging the Bottom of Foundation. This parameter is affected by the family parameter Cap (see Family Category and Parameters). The following image shows the difference between the Cap parameter enabled (in red) and disabled (in green). The Elevation at Bottom measurement is taken from this setting. This is a read-only parameter.
Identity Data
Comments	A field for placing general comments about the slab.
Mark	A label created for the slab. Possible use: shop mark. This value must be unique for each element in a project. Revit warns you when the number value is already used but allows you to continue using it. You can see the warning using the Review Warnings tool. See Reviewing Warning Messages.
Phasing
Phase Created	Indicates in which phase the slab component was created. See Project Phasing.
Phase Demolished	Indicates in which phase the slab component was demolished. See Project Phasing.
Identity Data (Analytical Foundation Slabs)
Surface Number	An identifier created for the analytical surface. This value should be unique across Analytical Floors, Analytical Foundation Slabs and Analytical Walls in a project. Revit warns you if the number is already used but allows you to continue using it. You can see the warning using the Review Warnings tool. See Reviewing Warning Messages.
Comments	User comments.
Structural Analysis
Analyze as	If set to Foundation, the slab will provide support for other elements connected to it. If set to Slab on Grade, the slab will only support itself. See Verifying the Analytical Model.
Analytical Properties
Family Type	The family type of the element.
Physical Material Asset	The name of a physical asset assigned to the foundation slab material (read-only).
Area	The total area of the foundation slab.
Perimeter	The total perimeter of the foundation slab.
Analytical Alignment
Alignment Method	Either Auto-Detect or Projection. Specifies if the horizontal and vertical references of the slab are automatically justified or have a defined projection.
z Projection	Either Top of Element, Center of Element, Bottom of Element, <Level...>, or <Reference Planes...>. Available when Alignment Method is specified as Projection. If in sketch mode, this parameter will default to Floor/Slab edge for either the whole model sketch or just a sketch line. Specifies the vertical limits of the analytical model at the base of the slab.