Roof¶

Step 2 puts the roof on the building. In the main panel you pick one of five shapes; pitch, overhang and special options are set on the right in the parameter panel.

Choosing a roof shape¶

Shape	Description
Flat roof	A horizontal roof slab. Preselected by default.
Hip roof	Sloped on all sides, without a vertical gable.
Shed roof	A single sloped face.
Gable roof	Two sloped faces, ridge in the middle, vertical gables.
No roof	The building ends flat at eaves height — no roof shell, no gable.

Shed roof on the T-plan

For the T-shaped floor plan the shed roof isn't available.

Pitch¶

For the gable, hip and shed roof you set the roof pitch: 5–75° — for the shed roof from 1°. Flat roof and "No roof" have no pitch.

Asymmetric gable roof¶

Only for rectangular plan + gable roof and standard ridge = yes: the "asymmetric gable roof" toggle in the parameter panel gives you two separate pitches — one per roof face. The ridge then shifts out of the middle toward the steeper side. The two pitches must differ.

Roof overhang¶

The overhang ranges from 0 to 2,5 m. Two modes:

One value for all edges — toggle "var. roof overhangs" off (default).
Per edge — toggle "var. roof overhangs" on: you give each outer edge or edge group its own overhang. Each row shows the floor plan in miniature beside it, with the edge in question highlighted in yellow. At inner corners (valleys), converging edges automatically share one value.

Secondary roofs (free floor plan only)¶

If your building has a leftover area that the main roof doesn't cover — a bay window or a lower extension, say — you use the "Roof 1", "Roof 2", … buttons to choose one of three options per area: the floor slab stays visible, the area gets a roof of its own (shape, pitch and overhang separate from the main roof) — or it becomes a roof terrace.

Value	Range
Shape	Flat, Gable, Hip, Shed
Pitch	0 to 80°
Overhang	0 to 2,50 m

The eaves of a secondary roof sit on the top edge of the floor slab of its area. Roof windows and dormers can be placed on secondary roofs too.

Roof terraces (free floor plan only)¶

As a roof terrace, the leftover area gets a railing along all free outer edges — either closed or as a baluster railing, as on balconies and terraces. The railing is fused solidly to the floor slab beneath it (one printed part); where it meets the exterior wall a fine print tolerance of 0,3 mm remains so the part doesn't jam during assembly (in the monolith model it sits flush).

Standard ridge — choose ridge and eaves yourself¶

For the gable roof and shed roof over a standard floor plan (rectangle, L, T, U) the parameter panel has the "standard ridge" toggle.

standard ridge = yes (default): ridge and eaves positions are set automatically — on the gable roof the ridge runs parallel to the longer building side, on the shed roof the face slopes down toward the preset eaves side. You don't need to choose anything else.
standard ridge = no: you set the position yourself. An outline window appears in which you click the relevant edges:
- Gable roof: Pick two opposite parallel edges — the ridge runs between them. Any further parallel edge you pick trims the roof surface (gutter) but does not move the ridge.
- Shed roof: Pick the eaves edge (the low side of the roof). Any further parallel edge trims the roof surface (gutter or ridge).
Wherever you pick no edge, the roof runs out to the outline. If on a simple rectangle you pick two non-opposite edge directions, they intersect automatically into a T-roof.

Standard floor plan only

On the free floor plan you always choose the ridge reference edges via the outline window — there is no standard-ridge toggle there. For the T-plan the shed roof isn't available.

Ridge reference edges on the free floor plan¶

On the free floor plan — and likewise on every secondary roof on a leftover area — you choose the ridge reference edges in the outline window. Your picks form groups, and each group is a roof part of its own. In the window the groups get different colors so you can see what belongs together.

The first two edges form the main group — the main ridge runs between them.
Every further edge parallel to them sets a gutter. It limits how far the main roof is carried down at that point, but does not move the ridge. Wherever you set no gutter, the roof surface runs on down to the lowest eaves — that creates a covered outdoor area.
Edges of a different direction form a cross gable. A cross gable has exactly two reference lines; if you pick a third edge in its direction, that starts a new cross gable. So gutters only exist in the main group.
Instead of a second edge you can click a corner point. A dashed, imaginary reference line then runs through it parallel to the first edge — handy when there is no suitable edge opposite the cross gable. Every cross gable may have its own corner point.

A cross gable must not rise above the main ridge

All roof parts have the same pitch — so the distance between the two reference lines alone decides the ridge height. If a cross gable spans further than the main roof, its ridge would sit higher; the app rejects that and tells you both spans.

As long as something is missing, the roof stays as it is

A group that is still incomplete — a single line waiting for its second reference line, say — does not change the roof. Only a complete pair rebuilds it. The hint below the window tells you what is missing, and a dot on the Roof 1 … Roof n tab shows which roof is still waiting for its picks. As long as one roof is unfinished, no roof is built at all — not even the ones already finished.

What you see in the window

Ridge, hip, valley and verge lines are drawn in live as thin white lines — solid for the ridge, dashed for hip, valley and verge. They come from the roof as actually built, not from a sketch. Sections marked red lie against an exterior wall running up past the roof: no eaves may drain there, so the eaves are interrupted at that point and a cross gable is formed above the wall section.

Eaves and ridge

Roof-related terms — eaves, ridge, verge, knee wall — are in the Glossary.