Calculating Roof Tile Spacing and Eave Extension
You can add a special dimension constraint between the eaves and
ridge of a tile roof, allowing you to determine the roof tile
spacing and calculate the length of the eave extension. The tile
spacing and the length of the extension are automatically updated
as the roof pitch changes. You can define the special dimension
constraint as follows:
- Fix the Dimensioning Eave to a
Wall.
- Determine Tile Spacing with a Special
Dimension Constraint.
- Determine the Length of the Extension
with a Special Dimension Constraint.
1. Fix the
dimensioning eave to a wall
First define the position of the dimensioning eave as fixed. Add
a dimension constraint fixing the dimensioning constraint (A) to a
wall (B).
2. Determine the tile
spacing
Define the tile spacing by adding a special dimension constraint
between the dimensioning eave and the ridge.
- Select Constraints >
Distance.
- Select the eave line (A).
- Select the ridge (B).
- Select the location of the distance dimension (C). The
Constraint Data dialog box opens.
- Click the Formula button.
- Select the calc_#spacing option from the Formula
list.
- Confirm by clicking OK. The Tile Roof Data dialog box
opens.
- Define the calculation parameters in the dialog box.
- Eave trim (A) - Total thickness of eave trims.
- Eave tile (B) - The distance of the 1st batten from the
eave.
- Ridge tolerance (C) - The distance of the last batten
from the ridge.
- Max. tile spacing - Enter the maximum allowed tile
spacing in the text field.
The Tile Roof Data Dialog
Box
- Confirm by clicking OK. The calculation parameters are saved
for the slope.
3. Determine the
length of the extension
Add a dimension constraint between the dimensioning eave and the
eave extension.
- Select Constraints >
Distance.
- Select a line in the dimensioning line (A).
- Select a line in the eave extension (B).
- Select the location of the distance dimension (C). The
Constraint Data dialog box opens.
- Click the Formula button.
- Select the number_of_tiles*#spacing*cos(#pitcha) option
from the Formula list, for example 5*#spacing*cos(#pitcha).
If necessary, edit the formula by modifying the number of tiles,
for example 4*#spacing*cos(#pitcha).
- Confirm by clicking OK.
When you have added the special dimension constraint, you can
change the number of tiles on the extension by editing the
properties of the distance constraint. Double-click the distance
constraint, and change the number of tiles in the Formula
field.
Adding
Constraints
Editing a Roof
Slope
Parametric Building Model