1. Creating Roofs and Roof Slabs
Chapter 7
Creating Roofs and Roof Slabs

2. Objectives Use RoofAdd to create hip, gable, shed, and gambrel roofs
Edit roof plate height, roof slope, thickness, overhang, and fascia angle using the Properties palette
Use grips to change a hip roof to a gable roof
Convert walls and linework to a roof
Convert roofs, walls, and linework to roof slabs
Create roof slabs and dormer roofs that intersect the main roof
Extend walls to the roof line

3. Accessing Roof and Roof Slab Commands

4. Roof Command Options
Select Roof from the Roof slab flyout of the Build panel. or
Select Roof from the Design palette.
Edit Properties palette to define the roof

5. Properties Palette for Creating a Roof

6. Roof Properties Palette of an Existing Roof

7. Content of the Roof Properties Palette
Design-Basic
General
Description
Layer
Bound Spaces
Dimensions
Thickness
Edge cut-Square/Plumb
Next Edge
Shape-Single, Double and Gable
Overhang
Lower Slope
Plate Height
Rise
Run
Upper Slope
Upper height
Slope
Location
Rotation
Elevation

8. Defining the Roof Properties
The Properties palette consists of edit fields to define the shape, overhang, and slope of the roof.
The roof is based upon a specified slope and plate height.
The Workspace options of the roof are:
Shape
Gable
Overhang
overhangValue
PHeight
PRise
PSlope
UHeight
URise
USlope
Match

9. Specifying Roof Point Locations
When the RoofAdd command is executed the Properties Palette opens as shown at right.
Respond to the command line prompts to specify roof points.
Select points using the Endpoint, Intersection, or Node object snap
Points selected are located at the bottom of the wall with a Z coordinate= 0

10. Plate Heights-Single Slope and Double Slope

11. Roof Edge Properties

12. Truss Roof Representation
Select Outer Edge of Wall for Roof Vertices Creates a Truss Roof Representation

13. Conventional Frame Roof Representation
Select Inner Edge of Wall for Roof Vertices Creates a Conventional Roof Representation

14. Steps to Creating a Roof from Walls
Select the Roof tool from the Design tool palette, right click and select Apply Tool Properties to>Linework and Walls
Respond to the command line prompts as shown on the next slide.

15. Apply Tool Properties to >Linework and Walls, con’t
Choose walls or polylines to create roof profile:
Select objects: (Select the walls using a crossing window from p1 shown at left.)
Specify opposite corner: (Select a point near p2 as shown at left.)
8 found
Select objects: ~EnterKey~ (Press the ~EnterKey~ to end selection.)
Erase layout geometry? [Yes/No] <No>: ~EnterKey~ (Press the ~EnterKey~ to retain the original geometry and develop the roof shown at left.)

16. Steps to Creating a Gable Roof
Select the Roof tool from the Design palette.
Edit the Properties palette Shape=Single Slope, Overhang=16", select point p1 as shown below.
Retain settings in the Properties palette, select point p2.

17. Steps to Creating a Gable Roof con’t
Edit the Properties palette set Shape=Gable, Overhang=3", select point p3.
5. Edit the Properties palette set Shape=Single Slope, Overhang=16", select point p4.
Edit the Properties palette set Shape=Gable, Overhang=3”, select point p5 as shown in next slide.

18. Gable Roof Created Using the Properties Palette

19. Accessing Edit Roof Edges/ Faces Command
Select the roof, choose Edit Edges from the Modify panel of the Roof tab
Select the roof, choose Edit Edges/Faces from the shortcut menu

20. Changing the Edge to Gable

21. Steps to Editing Roof Edge and Faces
Select the roof, right click and select Edit Edges/Faces from the shortcut as shown below. Respond to the command prompts as shown below.
Select a roofedge: (Select roof edge at p1 shown below.)
Select a roofedge: ~EnterKey~ (Press the ~EnterKey~ to end selection and open the Roof Edges and Faces dialog box.)
Edit the Roof Edges and Faces dialog box, click in the Overhang column of the top Roof Edges section, overtype the overhang value to 12 then click in the Roof Faces by Edge click in the Slope column and overtype the slope value to 90 as shown below. Pick OK to close the Roof Edges and Faces dialog box.
Slope of roof changed as shown at right.

22. Editing Edges/Faces from the Properties Palette

23. Steps to Using Grips to Create a Gable Roof
1. Select a roof to display its grips.
2. Select the ridge grip at p1 as shown below.
3. Stretch the hot grip to the left; specify the new location by selecting a point to the left near p2 as shown in B below.
4. Press Escape to remove the display of grips. The hip roof plane is converted to a gable as shown in C below.

24. Create a Gambrel Roof Using Double Slope

25. Accessing the Roof Slab Command

26. Roof Slab Properties and Components

27. Advantages of Roof Slabs
Roof slabs allow you to add detail features such as fascia, soffit, and frieze components
Roof slabs can be trimmed, extended, and mitered
Roof slabs can be trimmed to create a dormer
Materials can be assigned to a roof slab

28. Roof Slab Edge Section

29. Roof Slab Properties

30. Content of the Roof Slab Properties Palette
General
Description
Style
Bound spaces
Mode-Direct/Projected
Dimensions
A-Thickness
B-Vertical offset
C-Horizontal offset
Justify-Top, Center, Bottom, and Slopeline
Base height
Direction
Overhang
Baseline edge
Perimeter edge
Slope
Rise
Run
D-Angle

31. Roof Slab Justifications

32. Horizontal and Vertical Offsets

33. Closing a Roof Slab with Direction
The roof slab is created by selecting two points to specify the pivot point and baseline, and then selecting Ortho close from the shortcut menu.
The Direction property specified in the Properties palette allows you to create a roof slab to the left or right of the first roof edge line

34. Application of Ortho Close
Ortho close option can also be used after specifying a series of points as shown at right.
The roof shape is completed as necessary to form a right angle between the last roof edge and the first roof edge segment

35. Application of the Close Option
Select a series of points to specify roof slab vertices, right click and select Close.
Last segment is created to close to the first edge without regard to the angle formed.

36. Converting a Closed Polyline to a Roof Slab
Select Roof Slab of the Design palette, right click and choose Apply Tool Properties to>Linework, Walls and Roof
Select roof, walls or polylines: (Select polyline at p1 shown at right.)
Select roof, walls or polylines: ~EnterKey~ (Press the ~EnterKey~ to end selection.)
Erase layout geometry? [Yes/No] <No>: ~EnterKey~ (Press the ~EnterKey~ to retain the polyline.)
Creation mode [Direct/Projected] <Projected>: ~EnterKey~ (Press the ~EnterKey~ to project the roof above the polyline.)
Specify base height <0">:8' ~EnterKey~ (Type the distance value to project the roof.)
Specify slab justification [Top/Center/Bottom/Slopeline] <Bottom>: ~EnterKey~ (Press the ~EnterKey~ to create a bottom justified slab.)

37. Creating a Roof Slab from a Wall
Select Roof Slab of the Design palette, right click and select Apply Tool Properties to>Linework, Walls and Roof
Select roof, walls or polylines: 1 found (Select wall at p1 shown at right.)
Select roof, walls or polylines: ~EnterKey~ (Press the ~EnterKey~ to end selection.)
Erase layout geometry? [Yes/No] <No>: ~EnterKey~ (Press the ~EnterKey~ to retain the wall.)
Specify slab justification [Top/Center/Bottom/Slopeline] <Bottom>: ~EnterKey~ (Press the ~EnterKey~ to specify a bottom justification.)
Specify wall justification for edge alignment [Left/Center/Right/Baseline]<Baseline>: r (Specify the right justification.)
Specify slope Direction [Left/Right] <Left>: ~EnterKey~ (Press the ~EnterKey~ to select the default left justification.)

38. Converting a Roof to a Roof Slab
Select a roof, choose Convert from the Modify panel of the Roof tab.
Select a roof, choose Convert to Roof Slabs from the shortcut menu.

39. Converting a Roof to a Roof Slab
Select a Roof choose Convert from the Modify panel.
The Convert to Roof Slabs dialog box opens.
Specify a Roof Slab Style and clear Erase Layout Geometry check box, to retain the roof object.
Each plane of the roof is converted to a roof slab as shown at lower right.

40. Converting a Roof to a Roof Slab Using the Shortcut Menu
Select the roof, right click and select Convert to Roof Slabs. The Convert to Roof Slabs dialog box opens as shown below.
Specify the roof slab style and respond to the Erase Layout Geometry check box.
Select OK to dismiss the Convert to Roof Slabs dialog box.

41. Modifying Roof Slabs

42. Content of the Properties Palette for Existing Roof Slabs
Design-Basic
General
Description
Layer
Style
Bound Spaces
Shadow display
Dimensions
A-Thickness
B-Vertical offset
C-Horizontal offset
Edges button
A-Overhang
Edge Style
B-Edge Cut
C-Angle
Slope
Rise
Run
Hold fascia elevation
Pivot Point X
Pivot Point Y
Pivot Point Z
Location
Elevation
Additional information button

43. Editing Using the Roof Slab Edges Dialog Box
Select the roof slab, right-click and choose Edit Roof Slab Edges. Select an edge to open the Roof Slab Edges dialog box as shown below.

44. Grips of the Roof Slab

45. Trimming a Roof Slab Using ROOFSLABTRIM
Select the Roof slab at p1 shown below and select Trim from the Modify panel of the Roof Slab tab.
Respond to the workspace prompts as follows:
Select trimming object (a slab, wall, or polyline): (Select the wall at p2 at left shown below.)
Specify side to be trimmed: (Select a point near p3 as shown below.)
Roof slab is trimmed as shown at right below.

46. Extending a Roof Slab Using ROOFSLABEXTEND
(Select a roof slab p1 as shown at left below, select Extend from the Modify panel of the Roof Slab tab. Respond to the following workspace prompts.)
Select an object to extend to (a slab or wall): (Select the wall at p2 at left below.)
(Slab will be extended by lengthening two edges.)
Select first edge to lengthen: (Select the roof slab at p3 shown at left below.)
Select second edge to lengthen: (Select the slab at p4 shown at left below.)
(Wall extended as shown at right below.)

47. Mitering Roof Slabs Using ROOFSLABMITER-Intersection Method
(Select a roof slab and select Miter from the Modify panel of the RoofSlab tab.)
Miter by [Intersection/Edges] <Intersection>: ~EnterKey~ (Press the ~EnterKey~ to select the Intersection option.)
Select first roof slab at the side to keep: (Select the roof slab at p1 as shown at left above.)
Select second roof slab at the side to keep: (Select the roof slab at p2 as shown at left above.)
(Roof slabs are mitered as shown at right above.)

48. Mitering Roof Slabs Using ROOFSLABMITER-Edges Method
Select a roof slab and select Miter from the Modify panel of the RoofSlab tab.
Miter by [Intersection/Edges] <Intersection>: e ~EnterKey~ (Type e to select the Edges option.)
Select edge on first slab: (Select the edge at p1, shown at left above.)
Select edge on second slab: (Select the edge at p2, shown at left above.)
Edges extended to form miter as shown at right above.

49. Cutting a Roof Slab-ROOFSLABCUT
(Select the roof slab at p1 shown at left and select Cut from the Modify panel of the RoofSlab tab.)
Select cutting objects (a polyline or connected solid objects): (Select the polyline at p2.)
Select cutting objects (a polyline or connected solid objects) ~EnterKey~ (Press the ~EnterKey~ to end object selection.)
(Verify the roof slab is cut by selecting the slab as shown at right below.)

50. Adding a Roof Slab Vertex-ROOFSLABADDVERTEX
Select a roof slab and select Add from the Vertex flyout of the Modify panel in the Roof Slab tab.
Specify point for new vertex: _mid of (Hold the ~ShiftKey~ down, right click and select Mid from the shortcut; then select the edge near p1.)
Select the slab to verify the new vertex grip point.

51. Adding a Hole to a RoofSlab
Select a roof slab and choose Add from the Hole flyout menu of the Modify panel in the Roof Slab contextual tab. Respond to the workspace prompts as follows:
Select closed polyline or connected solid objects to define a hole: (Select the polyline at p1 as shown at right.)
Select closed polyline or connected solid objects to define a hole: (Press ENTER to end selection.)
Erase layout geometry? [Yes/No]<No>: ENTER ( Choose No.)

52. Adding Body Modifier to Roof Slabs
Select the roof slab at p1 and choose Body Modifier
Select objects to apply as body modifiers: (Select mass element at p2)
Select objects to apply as body modifiers: Enter (Press Enter to end selection.)
Edit the Add Body Modifier dialog box. Choose Replace from the Operation drop-down and Erase Selected Objects.

53. Creating a Roof Dormer
(Select the roof slab at p1 shown at right select Dormer from the Dormer panel of the Roof Slab tab.) Select objects that form the dormer: (Select wall at p2.) Select objects that form the dormer: (Select wall at p3.) Select objects that form the dormer: (Select wall at p4.) Select objects that form the dormer: (Select wall at p5.) Select objects that form the dormer: (Select dormer roof slab at p6.) Select objects that form the dormer: (Select dormer roof slab at p7.) Select objects that form the dormer: ~EnterKey~ (Press the ~EnterKey~ to end selection.) Slice wall with roof slab [Yes/No] <Yes>: ~EnterKey~ (Press the ~EnterKey~ to slice the dormer wall to remove the lower portion of dormer wall.) (Dormer created as shown at right, to complete the operation, use the erase command to erase the wall at p8.)

54. Determining Roof Intersections
To determine the valley intersections of multiple roof slabs:
Create a mass group
Use the mass group to identify where the planes intersect
Draw a polyline that traces the intersection, and use this polyline as a cutting object with the RoofSlabCut command to remove the unnecessary extension of the roof slab

55. Determining Roof Intersections using Mass Groups
Create a Mass Group to view the roof intersection.
Draw a polyline to specify cutting line of roof slabs.
Use the RoofSlabCut command to cut roof slabs

56. Attaching a Roof to a Mass Group
Select the Mass Group from the Massing tool palette.
Respond to the workspace prompts as follows:
Select elements to attach: (Select roof at p1)
Select elements to attach: (Select roof at p2)
Select elements to attach: (Select roof at p3)
Location: (Select a location near p4.)
Attaching elements…
3 element(s) attached.

57. Steps to Cutting and Editing Roof Slabs Based Upon the Roof Intersection
1.  View the roof from Top. Draw a polyline that traces the intersection of the roof using the Intersection object snap The polyline is shown at p5 in the isometric view.
2.  Select Southwest Isometric from the View flyout. Select the group right-click and choose Detach and detach the roof slabs from the group.
3.    Select the roof slab at p6 as shown at right, right click and select Cut from the short-cut menu. Respond to the workspace prompts as shown below.
Select cutting objects (a polyline or connected solid objects): (Select the polyline at p5.)
Select cutting objects (a polyline or connected solid objects): ~EnterKey~
Erase layout geometry [Yes/No] <No>:N ~EnterKey~
4.      Repeat step 3 to cut the p7 plane.
5.      Erase the roof planes which penetrate into the building, slabs at p8 and p9.

58. View of Slab Intersection After Cut

59. Roof Slab Styles
Roof slab styles include preset values for thickness and predefined roof slab edge styles.
Fascia, soffit, and frieze components can be assigned to roof slab edge styles of the roof slab.
Materials can be assigned to the roof slab to represent the roofing materials.
The Standard roof slab style is the default roof slab style when a roof slab is inserted.
Fourteen roof slab styles are included in the Design Tool Catalog.

60. Creating Roof Slab Styles
Select Roof Slabs and Slabs category of the Design Tool Catalog – Imperial or Design Tool Catalog – Metric from the Content Browser.

61. Importing Roof Slab Styles from the Content Browser

62. Defining a Roof Slab Style in the Style Manager

63. Components Tab

64. Materials Tab

65. Material Definition Sources
Apply Material Definitions using Material tool of the Design palette Or
Import the material definition in the Style Manager from \Documents and Settings\All Users\Application Data\Autodesk\ACA 2010\enu\Styles\Imperial\Material Definitions (Imperial)
\Documents and Settings\All Users\Application Data\Autodesk\ACA 2010\enu\Styles\Metric\Material Definitions (Metric)

66. Material Definitions of the Material Definitions (Imperial).dwg

67. Procedure to Assign Material Definitions to a Roof Slab
Import material definitions from the Visualization Catalog > AEC Material Tools of the Content Browser
Assign the Material Definition to the Roof Slab component in the Materials tab Roof Slab Styles dialog box. Or
Assign material definitions using the Material tool of the Design palette

68. Classifications Tab

69. Display Properties Tab

70. Creating a New Roof Slab Edge Style
Roof Slab Edge Styles are assigned to a roof slab to represent fascia, frieze, and soffit.
Roof Slab Edge Styles are defined in the Roof Edge Style folder of the Style Manager
Roof Slab Edge Styles are accessed from the Style Manager from the Roof Slab & Roof Slab Edge Styles (Imperial) drawing of the Imperial or Metric Style folders of Content.

71. Roof Slab Edge Styles in the Style Manager

72. General Tab –Roof Slab Edge Styles

73. Defaults Tab-Roof Slab Edge Styles

74. Design Rules-Roof Slab Edge Styles

75. Materials Tab-Roof Slab Edge Styles

76. Version History Tab of Roof Slab Edge Style

77. Materials Applied to Roof Slab and Roof Slab Edge

78. Assigning a Roof Slab Edge Style to a Roof Slab Edge
Roof slab edge styles can be assigned to a roof slab edge by selecting the Edges button in the Properties palette of an existing roof slab. Or
Select a roof slab, right click and select Edit Roof Slab Edges from the shortcut menu. Respond to the command line prompts to edit an edge

79. Edit Roof Slab Edges dialog box Accessed from the Edges button of the Properties palette

80. Specify a Roof Slab Edge Style for an Edge in the Edit Roof Slab Edges dialog box