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Colonists can build structures of a various materials, each with different beauty, flammability and hit-points. Enclosed areas will automatically prompt colonists to build a roof unless you apply a no roof region, or if the structure is too large (over 300 cells). Structures leave ash on the ground when burnt.

Autodoors

Autodoors are powered doors that open as pawns approach, allowing them to move through faster (stone doors) or without slowing at all (all other doors). They require a constant 50W charge to operate. A powered autodoor opens four times as quickly. An unpowered one acts just like a standard door. Autodoors have the same max hit points of a standard door of the same material. A powered door requires at least ~57.69% base speed to not slow colonists down, while unpowered doors require 4x that speed (which excludes all unpowered doors). Like standard doors, autodoors divide areas into separate rooms for room role and stats purposes. Autodoors require 40 steel, 25 materials and 2 components to construct.

Material	HP	Cost	Steel Cost	Work Required	Flammability	Opening Speed	Value
Gold	150	400	35	24	20%	100%	$7630.00
Granite Blocks	425	40	35	93	0%	45%	$167.20
Limestone Blocks	390	40	35	93	0%	45%	$159.20
Marble Blocks	300	40	35	93	0%	45%	$159.20
Plasteel	700	40	35	18	10%	100%	$1,163.20
Sandstone Blocks	350	40	35	93	0%	45%	$159.20
Silver	175	400	35	18	20%	100%	$883.20
Steel	250	75	-	18	20%	100%	$163.20
Slate Blocks	325	40	35	93	0%	45%	$159.20
Uranium	625	400	35	64	0%	90%	$3,130.00
Jade	125	40	35	64	0%	90%	$2,645.00
Wood Logs	100	40	35	13	100%	120%	$139.20

Doors

Doors provide entry points through walls for colonists while still keeping out enemies and wild animals. Pawns manually open doors which causes a delay as they try to pass through, as opposed to auto-doors which open on demand and allow faster passage. A door can be locked by marking it forbidden. Colonists can't use locked doors, however visitors, animals and colonists on mental breaks can pass through doors, even if locked. A door can be marked to 'Hold open' so that the next time it's opened it will stay open.

Material	HP	Cost	Work Required	Flammability	Opening Speed	Value
Gold	150	250	19	20%	100%	$7505.00
Granite Blocks	425	25	74	0%	45%	$62.70
Limestone Blocks	390	25	74	0%	45%	$57.70
Marble Blocks	300	25	74	0%	45%	$57.70
Plasteel	700	25	14	10%	100%	$685.20
Sandstone Blocks	350	25	74	0%	45%	$57.70
Silver	175	250	14	20%	100%	$510.20
Steel	250	25	14	20%	100%	$60.20
Slate Blocks	325	25	74	0%	45%	$57.70
Uranium	625	250	50	0%	90%	$2,510.20
Jade	125	25	50	0%	90%	$2,515.00
Wood Logs	100	25	10	100%	120%	$45.20

Roof

The current game version allows a roof extension of up to 6 cells from a wall, so interiors have a maximum size of 12 cells on the shortest side. Rooms built larger than this will remain unroofed (colonist buildings) or result in a roof collapse (mined rooms, or when demolishing pillars). Larger rooms can be built with the use of single-wall pillars.

The pattern for roof support is as follows:

To obtain maximum coverage, one can place supports in a grid, with 8 tiles between supports.

Roof deconstruction

This involves drawing a No Roof Zone over the area you wish to have roofs get rid of. Constructors will automatically go and safely remove the roofs without risk of collapse.

Overhead Mountains cannot be removed this way.

Roof collapse

This is dangerous as any collapse can cause injuries on colonists. If it's an Overhead Mountain collapsing, colonists will be buried alive. Casualties will cause negative thoughts.

Walls

An impassable wall, capable of holding up a roof if the space between supporting walls and beams is not too far away. Walls can be built out of any material and Power conduits may be constructed on an existing wall. Walls require 5 materials to construct.

Material	HP	Cost	Work Required	Flammability	Value
Gold	210	50	3	20%	$1500.00
Granite Blocks	595	5	29	0%	$15.72
Limestone Blocks	540	5	29	0%	$14.72
Marble Blocks	420	5	27	0%	$14.72
Plasteel	980	5	6	10%	$136.20
Sandstone Blocks	490	5	25	0%	$14.72
Silver	245	50	3	20%	$100.72
Slate Blocks	455	5	29	0%	$14.72
Steel	350	5	3	20%	$10.60
Uranium	875	50	5	0%	$500.00
Jade	175	5	13	20%	$505.00
Wood Logs	140	5	2	100%	$7.42