Roof

A single wall or column will support a roof in a roughly circular area 6 tiles around it.

A roof is an area of cover from the elements. They can be natural or artificial, with only minor differences between them. A roof can extend up to 6 tiles from a wall, column, rock wall, or similarly supportive structures, so roofed interiors have a maximum size of 12 cells across the shortest side. Interior areas built larger than this will remain partially unroofed without the use of additional support. Larger roofed areas can be built with the use of columns or interior walls as support pillars. Indoor roofs are automatically built by builders.

A roof will prevent rain from affecting the area underneath, prevent snow from building up, block sunlight, prevent lightning from striking the area, and enclose or partially enclose a room to help maintain its temperature.

To build or extend a roof outdoors, a "Build roof area" must first be drawn. Leaving 25% of room area or more unroofed makes the room status as "Room unroofed" which, among other effects, equalises room temperature to outside temperature.

Types

Overhead mountain

Overhead mountain has special properties compared to regular roof:

• Overhead mountain does not allow transport pods to land or any mortar shells to hit. Pods will land somewhere else; mortar shells are erased.
• Overhead mountain has natural temperature-regulating effects.
• Overhead mountain allows infestations to spawn (see Infestation#Spawning for details).
• Overhead mountain is considered more indoors for an undergrounder's Indoors need.
• Overhead mountain cannot be removed.
• Having a roof collapse will create collapsed rocks, instantly killing or destroying anything underneath. The roof remains the same.

Drawing roof areas

Areas can be designated to have a roof or not have a roof by drawing either a Build roof area or Remove roof area, located under the Architect/Zone tab. This can be used to create outdoor roofed areas (to prevent rain, snowfall, or item deterioration), or indoor unroofed areas (protected Solar panels, indoor growing areas). If there is no supporting wall or rock within 6 tiles, no roof will be built.

Roof collapse

A roof will collapse if the last supporting structure within 6 tiles is removed, whether by mining, deconstruction, or destruction. Removing the last tile of roof supporting another section of roof by deconstruction will delete the now-unsupported section but will not cause a collapse nor cause any damage.

Roof collapses cause damage to to everything and everyone underneath them, dealing injuries to pawns and damage to items. All roof collapses deal Crush damage. Thick mountain roof deals 99,999 damage with 999% AP, obliterating anything underneath it. Constructed and thin mountain roof deal between 15 and 30 damage with 0% AP, targeted at the "outside" and "top" of a pawn i.e. the neck of a human pawn and all its external children parts including the head.

Normal collapsed roof leaves filth. Collapsed overhead mountain will leave collapsed rocks. Pawns and objects caught under collapsed rocks will be utterly destroyed.

Roof deconstruction

Drawing a "Remove roof area" will cause colonists to remove a constructed roof. Constructors will automatically go and safely remove the roofs without risk of collapse. Overhead Mountains cannot be removed this way, only by triggering a collapse.

Because of the collapse protection mentioned above when removing the roof, it can be expeditious to direct pawns to only remove the outside ring of roofing to allow the inner roof area to become unsupported and vanish safely.

Gallery

• 

  A tile of corrugated sheet metal, used to show new roofs being placed.

• 

  Newly-built roof sections are briefly visible, before fading out.

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Architect

Structure

Animal flap • Autodoor • Bridge • Column • Door • Fence • Fence gate • Ornate door • Wall • Security door

Related

Roof