Pitched roofs, roof windows and dormers

A pitched roof is drawn on the outer faces of the walls below it, and its faces, ridges and hips are worked out from its edges. Flat roofs stay slabs.

Drawing a roof

Choose Roof (DA) on the storey whose walls carry it.
Before the first corner, set Shape, Pitch, Eave height above FFL, the overhangs and the thickness on the command line.
Type W for one roof per building part on the outline of the walls, or click the corners on the outer faces of the walls and close with C or Enter.
With Walls up to the roof on, as it is at first, the walls the roof was drawn on run up to its underside in the same step, so a gable wall gets its peak. Inner walls stay as they are.

Changing the roof

In the inspector, shape, pitch, eave height and thickness change all selected roofs. With one roof selected, each edge can become a Slope, a Gable, a Half-hip or a Mansard, with its own pitch and overhang.
The pitch of a roof is always its top slope's: a mansard's lower slope and a half-hip's gable keep theirs, and have fields of their own.
A wall can also be set to run up to a roof later: select it and choose the roof under Up to in its properties.

Roof plan and print

Roof plan is the first entry of a plan pane's storey select once the model has a roof. It shows the roofs and flat roof slabs of all storeys from above, with ridges, hips, valleys and an arrow down each slope; roofs can be picked and changed there.
On the storey's own plan, the roof is cut at the plan's height: what lies above the cut is drawn in the line style for what lies above the cut.
In the print dialog Roof plan is ticked when there is a pitched roof, and prints after the storeys.

Roof windows and dormers

Roof window (DF): click on a slope, on the storey's plan or on the roof plan. The window cuts a hole through the roof, with a frame and glass. It must lie wholly on one slope.
Dormer (GA): choose the Kind (shed dormer, gable dormer or Zwerchhaus) and click where the middle of its front goes on a slope. A Zwerchhaus goes onto the outer face of a wall under the eave, breaking the eave.
A dormer's front and cheeks are ordinary walls: draw them with W under it, set them Up to the roof, and put windows in them with WI. So the room below has its area like any other.