Rooms and areas to DIN 277

arcraum works out the areas of DIN 277 from the walls you draw and the rooms you place in them. Nothing is typed in: a moved wall changes the areas at once, and the Areas section of the side panel always shows the schedule as the model is now.

Placing rooms

1. Draw the walls first. A room takes its outline from the walls around it, so they must close.
2. Start Room (R) and set Name and Usage on the command line. Usage starts at group 1, Wohnen und Aufenthalt.
3. Click inside each space. Every click places the next room, numbered on from the highest number on the storey; Enter ends the tool. Each room is one undo step.
4. The room stamp in the plan shows number, name and area. It prints the same way.

A point the walls don't close around, or a space that already has a room, is refused. If walls are changed later and a room loses its area, see A room says "not enclosed".

Usage and the kinds of area

Select a room to change it under Selection: Name, Usage (DIN 277) and Counts as.

• The usage group decides where a room's area counts: groups 1 to 7 are NUF, 8 (Technische Anlagen) is TF, 9 (Verkehrserschließung und -sicherung) is VF.
• NRF is NUF + TF + VF, and also holds rooms without a usage.
• KGF is everything else inside the outer faces of the walls: the walls themselves, doors and windows, free-standing walls inside a room, and every enclosed space that has no room yet.
• BGF is NRF + KGF, worked out from the outer outline of the walls.
• A room runs along the wall faces, past doors and windows; a free-standing wall inside it comes off its area.

Regelfall and Sonderfall

Counts as is Regelfall (R) or Sonderfall (S). A room in the Sonderfall, such as a balcony or a loggia, counts in none of NUF, TF, VF, NRF, KGF and BGF; it is added up on its own, as S. Its stamp shows "(S)".

1. A balcony or terrace has no walls around it, so draw its outline: in Room, type O and click its corners, or start Room outline (RD). Enter or C closes it.
2. A room drawn as an outline starts as Sonderfall. Its area comes from the outline.
3. A loggia between walls is placed like any room and set to Sonderfall under Selection: its area then leaves the BGF, so nothing counts twice.
4. A room with an outline set to Regelfall adds to the BGF what lies outside the walls.

Stair openings and voids

A Slab opening (SO) cut into a storey's slab has a Kind. The kinds are reference data and show by their German names on every screen.

• Treppenöffnung stays in the floor area: the room and the BGF keep their areas.
• Luftraum comes off the floor area: the part over a room comes off that room, and the part over the storey comes off its BGF. A slab is the floor of its storey, so a void counts on the slab's storey.
• The inspector of a selected opening says which: "Comes off the floor area" or "Stays in the floor area".

The Areas section

• There is a table per storey: number, name and area of each room, then the storey's BGF. A storey with several levels has a table per level and a row "BGF …, all levels" (see Split levels).
• Below come the sums over all storeys: NUF, TF, VF, "No usage" where a room has none, NRF, KGF, BGF, and S for the Sonderfall rooms.
• While the schedule is incomplete, a line under the sums says so: rooms without an area ("not enclosed", "second room here") and enclosed spaces without a room, which count as KGF until a room is placed in them.
• Walls on hidden layers count too, so hiding a layer never changes an area.
• In a project with a room program, a selected room also offers Room program, to link it to a line of the program: see The room program. BRI and A/V in the same section are explained under Key figures.

Limits

• The Wohnfläche to WoFlV isn't worked out.
• Open-plan areas can't be divided yet: a room needs walls on all sides or a drawn outline. Drawn outlines that overlap aren't detected.
• The BGF includes inner courtyards enclosed by the building.