Dormer Determination

General

The centering dialog box defines the geometry and the position in depth or height of the main roof surface. This dialog box differs for each dormer type, with the difference only in the upper area of the dialog box. These parts are described in the subchapter 'Dormer types':

The dormer position can be determined by the following values:

Angled roof assembly main roof incl. tiles: If the main roof has a roof specification, this field is disabled. The thickness of the assembly from the top edge of layer 0 (= top of rafter) to the top edge of the tile layer is shown. If there is no tile layer, the thickness to the topmost layer is shown.

If the main roof has no specification, the thickness for the assembly including tiles can be entered here.

Distance of parapet to front edge of dormer face: The parapet beam does not necessarily have to be flush with the front edge on the dormer contour (dormer face). With this value the parapet beam can be shifted backward (positive value) or forward (negative value).

Distance last batten before dormer face: If a tile division has been made on the main roof, the position of the dormer can be aligned to the tile division. In this disabled field the position of the dormer face relative to the last batten before the dormer is displayed. If the dormer should be oriented to the tiles, click the switch at the right end of the field. A dialog box will then open in which various settings can be made.

Height top edge of parapet: This and the following two values are alternative values. Only two of the three values are always specified; the third is then calculated automatically. To enter the disabled value, delete the value you do not want to enter. That value will then be disabled and the previously disabled value will become active.

The 'height of the top edge of the parapet' is the height of the parapet beam measured from the reference height entered above.

Parapet overhang above roof covering: This is the vertical overhang of the parapet beam above the roof covering entered (or displayed) above. (see also 'Height top edge of parapet')

Distance front edge of dormer face to reference line: This is the horizontal distance from the reference line to the front edge of the dormer face. The parapet beam can be additionally shifted by the value 'Distance of parapet to front edge of dormer face'. (see also 'Height top edge of parapet')

Dormer position relative to main roof battens

If a tile division has been made on the main roof, the position of the dormer can be aligned to the tile division. In this dialog box you can make the corresponding settings:

Shift dormer face relative to battens: If the dormer must be shifted so that it sits in the desired position relative to the main roof battens, there are different options for how this should be done:

forward: The dormer is shifted forward (toward the main roof eave) until the distance to the next batten set below matches.

backward: The dormer is shifted backward (away from the main roof eave) until the distance to the next batten set below matches.

nearest batten: The dormer is shifted forward or backward until the distance to the nearer batten set below matches.

Distance last batten before dormer face: Here you enter the desired distance of the dormer face to the last batten in front of it. The dormer will then be shifted accordingly. This value is displayed in the centering dialog box in the identically named field and any other values affecting the dormer position will be adjusted as necessary.

Dormer types

The inputs for the dormer geometry depend on the dormer type. The first three inputs are the same for all dormers:

Reference height: Here you can enter the height from which all other height inputs in the dialog box should be measured. For example, you could enter the height of the underside of the attic floor. Then all height entries in this dialog box can be made from the underside of the attic floor.

Profile position: For a dormer, just like for a normal roof centering, you can create a profile. This profile can be created here or may already have been created in the project management. To adopt an existing profile you can enter the profile position number here or click the switch at the right side of the field. This switch opens a dialog box where you can select, modify, or create profiles from a list with preview.

When you select a profile position, the roof pitch, roof overhang, eave height, specification, and for some dormer types the width are adopted from the profile. These fields are therefore locked and are only released again after deleting the position number.

For the hipped dormer a profile can also be imported for the hipped area.

Implementation: Here you enter the roof surface specification for the dormer.

All further values differ depending on the dormer type.

Gable dormer

The gable dormer is the simplest dormer type. The values are not alternative values and therefore do not influence each other.

Roof pitch, roof overhang, eave height: If the values were not defined via a profile, enter these values manually. The eave height refers to the 'reference height' entered above.

Gable overhang of the dormer: The gable overhang is measured from the dormer face (dormer contour) to the verge.

Width of the dormer: Here you can enter the width of the dormer from corner post to corner post. If a profile was adopted above, the double house width from the profile is automatically shown here. However, the field is not disabled so that the value can be changed despite profile adoption.

For 'reference height', 'profile position' and 'specification' see Dormer types, for the dormer position see General and for dormer positioning see Positioning.

Pointed dormer

The values 'roof pitch', 'width of the dormer' and 'ridge height' are alternative values. That means only two of the three values are entered at any time. The third value is then calculated automatically. To enter the disabled value, delete the value you do not want to enter. That value will then be disabled and the previously disabled value will become active.

The gable overhang is measured from the dormer face (dormer contour) to the verge.

For 'reference height', 'profile position' and 'specification' see Dormer types, for the dormer position see General and for dormer positioning see Positioning.

Triangular dormer

The triangular dormer corresponds to half a gable dormer and can have the eave on the left or right.

Roof pitch, roof overhang, eave height: If the values were not defined via a profile, enter these values manually. The eave height refers to the 'reference height' entered above.

Ridge roof overhang: Since the dormer is only half a gable dormer, a roof overhang at the ridge can be entered for the opposite side.

Gable overhang of the dormer: The gable overhang is measured from the dormer face (dormer contour) to the verge.

Width of the dormer: Here you can enter the width of the dormer from corner post to corner post. If a profile was adopted above, the double house width from the profile is automatically shown here. However, the field is not disabled so that the value can be changed despite profile adoption.

Side on which the roof surface will be generated: Here you can set whether the dormer eave should be generated on the left or right side.

For 'reference height', 'profile position' and 'specification' see Dormer types, for the dormer position see General and for dormer positioning see Positioning.

Hipped dormer

The hipped dormer is similar to the gable dormer. It only has all inputs doubled, once for the lateral dormer surfaces and once for the hipped area. The values are not alternative values and therefore do not influence each other. The values are described here only once:

Roof pitch, roof overhang, eave height: If the values were not defined via a profile, enter these values manually. The eave height refers to the 'reference height' entered above.

Gable overhang of the dormer: The gable overhang is measured from the dormer face (dormer contour) to the verge.

Width of the dormer: Here you can enter the width of the dormer from corner post to corner post. If a profile was adopted above, the double house width from the profile is automatically shown here. However, the field is not disabled so that the value can be changed despite profile adoption.

For 'reference height', 'profile position' and 'specification' see Dormer types, for the dormer position see General and for dormer positioning see Positioning.

Shed dormer

The input for the shed dormer includes values that influence each other:

Shed pitch, roof overhang, eave height, height of the kink line from dormer to main roof: If these values were not defined via a profile, enter these values manually. The values are alternative values. That means only three of the four values are entered at any time. The fourth value is then calculated automatically. To enter the disabled value, delete the value you do not want to enter. That value will then be disabled and the previously disabled value will become active.

The 'eave height' and the 'height of the kink line from dormer to main roof' refer to the 'reference height' entered above.

Width of the dormer: Here the width of the dormer from corner post to corner post can be entered.

Lateral overhang of the dormer: The lateral overhang is measured from the lateral dormer contour to the verge.

For 'reference height', 'profile position' and 'specification' see Dormer types, for the dormer position see General and for dormer positioning see Positioning.

Trapezoidal dormer

The input for the trapezoidal dormer includes values that influence each other:

Shed pitch, roof overhang, eave height, height of the kink line from dormer to main roof: If these values were not defined via a profile, enter these values manually. The values are alternative values. That means only three of the four values are entered at any time. The fourth value is then calculated automatically. To enter the disabled value, delete the value you do not want to enter. That value will then be disabled and the previously disabled value will become active.

The 'eave height' and the 'height of the kink line from dormer to main roof' refer to the 'reference height' entered above.

Projection dimension, slope of the projection surface: These values are also alternative values. That means only one of the two values is entered at any time. The second value is then calculated automatically. To enter the disabled value, delete the value you do not want to enter. That value will then be disabled and the previously disabled value will become active.

Width of the dormer face (without projection dimension): Here you can enter the width of the dormer from corner post to corner post. The projection surfaces are not considered.

Width of the dormer at the roof kink: For the trapezoidal dormer a width at the roof kink (length of the valley line) can additionally be entered. If this width is smaller than the 'width of the dormer face', the shed surface becomes narrower toward the rear and the hip lines converge toward the rear.

For 'reference height', 'profile position' and 'specification' see Dormer types, for the dormer position see General and for dormer positioning see Positioning.

Round-arched dormer

The input for the round-arched dormer includes values that influence each other:

Eave height, ridge height, arch height: The values are alternative values. That means only two of the three values are entered at any time. The third value is then calculated automatically. To enter the disabled value, delete the value you do not want to enter. That value will then be disabled and the previously disabled value will become active.

The eave height plus the arch height equals the ridge height. The arch height does not necessarily have to be twice the dormer width. If the arch height is smaller, a segmental-arch dormer results.

The 'eave height' and the 'ridge height' refer to the 'reference height' entered above.

Gable overhang of the dormer: The gable overhang is measured from the dormer face (dormer contour) to the verge.

Width of the dormer: Here the width of the dormer from corner post to corner post can be entered.

For 'reference height', 'profile position' and 'specification' see Dormer types, for the dormer position see General and for dormer positioning see Positioning.

Positioning

The centering dialog boxes can be exited with the buttons 'OK', 'Position', 'Wall input' or 'Cancel'. The 'OK' button is only available after the dormer has already been placed once and the dialog box was opened only for a modification.

With 'OK' the left edge of the dormer contour remains at its position and the dormer changes accordingly. If you make the dormer, for example, wider or narrower, the right edge of the dormer contour shifts.

With 'Wall input' you can continue directly into the wall input without positioning the dormer beforehand. Positioning then occurs later after the wall or opening input.

With 'Position' the positioning of the dormer is started. If you reopen a dormer that has already been placed for modification, you can place the dormer again on the main roof surface by using the 'Position' button.

Using the option 'Insert dormer fixed' you specify whether the dormer can only be moved parallel to the main roof eave when positioning (the vertical position is then fixed) or whether the dormer can be moved freely on the main roof surface. The entered values for the dormer's vertical position are then ignored.

After selecting the 'Position' button, a dialog box opens in which the dormer is displayed in its centered and trimmed form. There you select the point of the dormer to be placed. The dormer is first shown in plan view. By right-clicking you can leave the dialog box with the crosshair and select one of the buttons at the bottom of the dialog box. This also allows other views to be selected. Using the 'Cancel' button returns you to the centering dialog box.

After choosing a point the dialog box disappears and the dormer is attached to the crosshair. If you had selected the option 'Insert dormer fixed', the dormer can now only be moved horizontally. The dormer is now positioned by a point. All input and snapping functions (middle mouse button or Shift-right mouse) are available for this.