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Roof

Roofs are components that define different types of roofs for the building design. Various types of roofs can be made in REVIT Architecture.

There are three main methods of making Roofs:


1. Roof by Footprint

2. Roof by Extrusion

3. Roof by Face (shall be covered in later chapters).


ROOF BY FOOTPRINT

With the Roof by Footprint tool, you specify the footprint or outline of the roof in a plan view. You then define the slopes of the roof by identifying lines in the footprint that are edges of sloping roof planes.


Procedure:


1. Display a floor plan view or a reflected ceiling plan view.

2. Click Home tab -> Build panel -> Roof drop-down -> Roof By Footprint.

Note: If you try to add a roof on the lowest level, a dialog prompts you to move it to a higher level. If you choose not to move the roof to a different level, REVIT Architecture notifies you later if the roof is too low.

3. Click Create Roof Footprint tab -> Draw panel, and select a sketch or pick tool.

4. Sketch tools allow you to create the roof by clicking and moving the cursor; pick tools allow you to select existing lines or walls.

5. To edit roof properties before sketching, click Properties.

Tip: When using Pick Walls, you can specify the overhang before you sketch the roof. On the Options Bar, select Extend to wall core if you want the overhang to be measured from the core of the wall, and then specify a value for Overhang.

6. Sketch, or pick, a closed loop for the roof.

7. Set slope defining lines.

8. To change the slope definition of a line, select the line and, on the Options Bar, click the Defines slope check box. For lines that are slope defining, you can change the slope value by     clicking the line and editing the value.

9. When a roof line is set to slope defining, the slope symbol appears adjacent to it.

10. Click Finish Roof.

11. To see the roof, open a 3D view.


Tips:
  • To cut off a roof in order to sketch another roof on top of it, use the Cutoff Level constraint in the Instance Properties, and then specify a height for the Cutoff Offset. This property specifies the distance above or below the level at which the roof is cut off.
  • If a roof includes a slope-defining arc line, you can specify the number of segments for the line. Access the Instance Properties for the arc line and specify a value for Number of Full Segments. By default, 4 segments are created. If you specify zero segments, a conical roof is created.


WORK PLANE

Each view in REVIT Architecture is associated with a work plane. In some views (such as plan, 3D, and drafting) and for views in the Family Editor, the work plane is automatically set. In other views, such as elevation and section views, you need to set the work plane. The work plane is necessary for sketching operations such as creating an extruded roof, and for enabling tools in particular views, such as Rotate and Mirror in a 3D view.

Work plane is a similar concept such as UCS in AutoCAD.

To set the view to a work plane:

1. Click Home tab -> Work Plane panel -> Set.

2. In the Work Plane dialog, under Specify a new Work Plane, select one of the following options:

Name — Choose an available work plane from the list, which contains names of levels, grids, and named reference planes.

Note: The list is active even if you have not selected the Name option. If you choose a name from the list, REVIT Architecture automatically selects the Name option.

Pick a plane — REVIT Architecture creates a plane coincident to the selected plane. You can select any plane that can be dimensioned, including wall faces, extrusion faces, levels, grids, and reference planes.



Pick a line and use the work plane it was sketched in—REVIT Architecture creates a work plane that is coplanar with the work plane of the selected line.

3. If the plane you choose is perpendicular to the current view, the Go to View dialog opens, giving you options of which view to open based on your selection.

For example, if you select a north-facing wall, the upper pane in the dialog lets you choose a parallel view (east or west elevation), or in the lower pane you can choose a 3D view.

4. Select a view, and click Open View.


ROOF BY EXTRUSION


You create extruded roofs in relation to a level in a project. You can use a combination of straight lines and arcs to create the profile of the roof. The height of the roof depends on the location where you sketch the profile in the elevation view.

1. Display an elevation, 3D, or section view.

2. Click Home tab -> Build panel -> Roof drop-down -> Roof By Extrusion.

3. In the Work Plane dialog, select an option for specifying the work plane.

4. To specify the reference level and offset for the roof, click Create Extrusion Roof Profile tab -> Element panel -> Roof Properties.

5. In the Instance Properties dialog, select a value for Reference Level. The highest level in the project is selected by default.

6. Specify a value for Offset to raise or lower the roof from the reference level.

7. REVIT Architecture places a reference plane at the specified offset. Using the reference plane, you can control the position of the extruded roof in relation to a level.

8. Click OK.

9. Sketch the profile of the roof. The profile must be an open loop, as shown in the following image.

10. Click Finish Roof.

11. To see the roof, open a 3D view.

Note: If you need to attach walls to the roof, select the walls and click Modify Walls tab -> Modify Wall panel -> Attach. Then, select the roof.



CUTTING AN OPENING IN AN EXTRUDED ROOF


1. Select the extruded roof, and click Modify Roofs tab -> Modify Roof panel -> Vertical Opening.

2. If the Go to View dialog is displayed, choose the appropriate plan view in which to edit the profile.

3. A plan view representation of the roof is displayed. Reference planes define the boundary of the roof.

4. Sketch closed-loop openings in the roof using the sketch tools.

5. Closed-loop sketches in sketch mode

6. Click Finish Roof.

7. Closed-loop sketches become vertical cuts in the roof


SLOPED GLAZING ROOF


1. Click Home tab -> Build panel -> Roof drop-down -> Roof By Footprint or Roof By Extrusion.

Note: If you try to create a roof on the lowest level, a dialog prompts you to move it to a different level, ensuring that the roof is higher than any walls joining to it. If you choose not to move the roof to a different level, REVIT Architecture notifies you later if the roof is too low.

2. Sketch the roof.

3. If the roof is based on a footprint, specify roof boundary lines as slope-defining, or use the roof slope arrow to define the slope.

4. Click Finish Roof.

5. Select the roof, and in the Type Selector drop-down, select Sloped Glazing.

6. You can place curtain grids on the curtain panels of the sloped glazing. Press Tab to switch between horizontal and vertical grids.


JOINING ROOFS


Note:

This is a general procedure for joining roofs. You may have variations based on design intent.

1. Sketch walls and roofs for your design.

2. Sketch a minor roof near your building design, and then use the Roof tool to create the roof.

Note: that you cannot add a minor roof by editing the sketch of the major roof.

3. Go to 3D view. On the View Control Bar, select Shading for Model Graphics Style.

4. If necessary, spin the design to facilitate selecting the edges of the wall or the major roof and the minor roof.

5. Click Modify tab -> Edit Geometry panel -> Join/Unjoin Roof.

6. Select one edge on the end of the minor roof that you want to join.

7. Select a face on the wall or major roof to which you want to join the minor roof. \

8. REVIT Architecture joins the roof.


CREATING A DORMER USING SLOPE ARROWS


1. Sketch a roof footprint, including slope-defining lines.


2. While in sketch mode, click Create Roof Footprint tab -> Edit panel -> Split.

3. Split one of the lines in the footprint at 2 points, creating a middle line segment (the dormer segment).

4. This line segment's length defines the bottom width of the dormer.

5. If a slope symbol displays next to the dormer segment, change its properties so it does not define slope:
    • While still in sketch mode, click Modify.
  • Select the segment.
  • On the Options Bar, clear Defines slope.
6. Click Slope Arrow, and sketch a slope arrow from one end of the dormer segment to its midpoint.

7. Click Slope Arrow again, and sketch a second slope arrow from the other end of the dormer segment to its midpoint.

8. Select the slope arrows and define their heights in its properties. Click Finish Roof, and open a 3D view to see the results.



CREATING A DORMER OPENING IN A ROOF

1. create a minor roof and with Join/Unjoin tool, join it with the main roof. See 'Topic Joining Roofs' above for the procedure.

2. Create walls in plan and attach their top with the minor roof and the base with the major roof.

3. Open a plan view or an elevation view in which you can see the dormer roof and the attached walls. If the roof is extruded, open an elevation view.

4. Click Modify tab -> Edit Geometry panel-> Openings drop-down-> Dormer Opening.

5. Highlight the main roof on the building model, and click to select it.

Tip: Watch the status bar to be sure that you are highlighting the main roof.

6. The Pick Roof/Wall Edges tool is active so that you can pick the boundaries that compose the dormer opening.

7. Place the cursor in the drawing area.

8. Valid boundaries are highlighted. Valid boundaries are a joined roof or its bottom face, a side face of a wall, a bottom face of a floor, an edge of the roof to be cut, or a model line on the face of the roof to be cut.

9. In this example, side faces of walls and joined faces of the roof were selected.

10. Click Finish Opening.

11. Create a section view through the dormer to see how it cuts the main roof.


12. REVIT Architecture makes both vertical and horizontal cuts in the roof.


ADDING ROOF FASCIA


1. Click Home tab-> Build panel -> Roof drop-down -> Fascia.

2. Highlight edges of roofs, soffits, other fascia, or model lines, and click to place the fascia.

3. As you click edges, Revit Architecture treats this as one continuous fascia. If the fascia segments meet at corners, they miter.

Note: Watch the status bar. It will indicate valid references or points where you can place fascia. For example, if you are placing fascia on a roof, a valid reference might be: Roofs : Basic Roof : Reference. When you place fascia in a section view, place the cursor near the corners of the element to highlight the reference or press Tab.

4. Click Place Fascia tab -> Profile panel -> Finish Current to finish the current fascia and start a different fascia.

5. Move the cursor to a new edge and click to place.

6. This different fascia does not miter with other existing fascias, even if they meet at the corners.

7. Click onto white space in the view to finish placing roof fascias.



ADDING ROOF GUTTER

You can add gutters to edges of roofs, soffits, and fascia. You can also add gutters to model lines.

1. Click Home tab-> Build panel-> Roof drop-down-> Gutter.


2. Highlight horizontal edges of roofs, soffits, fascias, or model lines, and click to place the gutter.

3. As you click edges, Revit Architecture treats this as one continuous gutter.

Note: Watch the status bar. It will indicate valid references, or points where you can place roof gutters. For example, if you are placing a gutter on a roof, a valid reference might be: Roofs : Basic Roof : Reference. When you place gutters in a section view, place the cursor near the corners of the element to highlight the reference or press TAB.

4. Click Place Gutter tab -> Profile panel -> Finish Current to finish the current gutter and start a different gutter.

5. Move the cursor to a new edge, and click to place.

6. To finish placing gutters, click on white space in the view.




ADDING ROOF SOFFITS


Design intent for creating roof soffits can vary widely. This procedure creates a soffit from a 2-loop sketch between a wall and a roof. The soffit is associated with the walls and the roof. To create non-associative soffits, use the Lines tool while in sketch mode.

1. Click Home tab-> Build panel -> Roof drop-down -> Roof Soffit.

2. Click Create Roof Soffit Boundary tab -> Draw panel -> (Pick Roof Edges). This tool creates a locked sketch line.

3. Highlight the roof, and click.

4. Click Create Roof Soffit Boundary tab-> Draw panel -> (Pick Walls), highlight the outside faces of the wall beneath the roof, and click to select.

5. Use the Trim tool to trim the excess sketch lines and close the sketch loop.

6. Click Finish Soffit.

To see the soffit better, create a section view through the plan view that shows the wall meeting the roof.

Note: To complete the join, use the Join Geometry tool to join the soffit to the wall, and the wall to the roof.



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