Editing Sterile tile

{{infobox main|structure|
| name = Sterile tile
| description = Sterile tiles with special cleanliness-enhancing properties. Extra-clean rooms improve outcomes in hospitals and research labs. This tile is very slow to build, but quick to clean.
| image = ground sterile tile.png|Sterile tile
| type = Floor
| type2 = 
| placeable = True
| deconstructable = true
| size = 1 ˣ 1
| speed = 1
| beauty = -1
| flammability = 0
| cleanliness = +0.6
| research = Sterile materials
| work to make = 1600
| resource 1 = Steel
| resource 1 amount= 3
| resource 2 = Silver
| resource 2 amount = 12
| skill 1 = Construction
| skill 1 level = 6
| marketvalue = 24
| page verified for version = 1.3.3101
}}{{Info|'''Sterile tile''' has the highest [[Room stats#Cleanliness|cleanliness stat]] of all floors 0.6}}

== Acquisition ==
Sterile tiles can be constructed once the [[Research#{{P|Required Research}}|{{P|Required Research}}]] research project has been completed. Each tile requires {{Required Resources}}, {{ticks|{{P|Work To Make}}}} of work, and a [[{{P|Skill 1}}]] skill of {{P|Skill 1 Level}}.

This tile is relatively slow to construct, taking almost 19x longer than a standard [[wood floor]].

==Summary==
Sterile tiles boost Cleanliness by {{+|0.6}}; an entire room of sterile tiles will have 0.6 Cleanliness. In addition, they only take 60% of the time to clean, and have {{--|1}} [[beauty]] per tile. Sterile tiles are non-flammable and do not penalize walk speed.

== Analysis ==
Cleanliness is important for a few different types of [[rooms]] and buildings. Having a high base cleanliness from sterile tiles means a greater margin before [[filth]] accumulation matters and, in some cases, provides additional bonuses.  The following are affected:
* '''Hospitals:''' In a full room of sterile tiles, surgery success is increased by roughly {{Good|x1.05}} from 0 cleanliness, while tend quality also increases.{{Check Tag|How much?}} [[Infection]] chance per wound is also multiplied by x30%, compared to x50% at 0 cleanliness.
**While the maximum surgery success chance (98%) is possible without sterile tile, the extra cleanliness provides a buffer when patients start bleeding all over the floor and the extra tend quality can all save a pawn's life. Sterile tiles should be installed when you can afford it.
* '''Laboratories:''' [[Research]] is accelerated in a clean room by up to {{+|9%}} in a sterile room, when compared to 0 cleanliness.
* '''Kitchens:''' [[Cooking]] in a dirty room has a chance to give [[food poisoning]]. However, the cleanliness only needs to be at -2.0 or higher to avoid the higher chance. Therefore, even [[Terrain|dirt]] floor is sufficiently clean so long as filth is removed. [[Straw matting]] is naturally sufficient as well, and prevents 95% of accumulated dirt and trash, which usually makes up for the loss of cleanliness buffer over sterile tile. If your kitchen is sufficiently small, sterile tiles will generally save time in cleaning, but for larger kitchens, straw matting will generally save more time.
* '''[[Biosculpter pod]]s:'''{{IdeologyIcon}} Pods run up to {{+|15%}} faster in a sterile room. As room space doesn't matter, you can make a 2x3 room with just the pod inside it, which is easily affordable.

Cleanliness also increases room impressiveness, but the cost and [[beauty]] malus makes this very inefficient. If your only goal is to increase Impressiveness, then [[steel tile]]s are cheaper, have no beauty, and still provide a +0.2 cleanliness bonus. [[Sculpture]]s, when combined with steel tile, [[stone tile]]s, or even [[concrete]], are much more cost effective at raising Impressiveness, so long as you have a competent artist (~6+ Art skill).

In general, sterile tiles aren't an immediate priority to research. Get power, weapons, and enough defenses first so that your colony doesn't fall apart. Then you should get sterile tiles to help save lives and speed up research. The research is also a prerequisite for [[hospital bed]]s (and by extension [[vitals monitor]]s), which provide a further boost to medical success.

=== Other clean flooring ===
[[Steel tile]]s only provide 0.2 cleanliness, but have the same 60% cleaning time and do not impact beauty. However, steel tiles are cheaper, costing {{icon small|steel}} 7 [[steel]] ($16) rather than {{Required Resources}} ($24). In addition, steel tiles only require Smithing to be researched. If silver is low (but steel is high), or if sterile tiles have not been researched yet, then these are the best tiles for cleanliness. 

[[Concrete]] and [[paved tile]]s have 0 cleanliness, and take a bit longer to clean (80% clean time), but are much cheaper. They only take {{icon small|steel}} 1 [[steel]] and {{icon small|steel}} 2 [[steel]], respectively, making them suitable before you can afford sterile tile. The only difference between the two is that concrete has -1 beauty, which can be offset by the aformentioned sculptures.

[[Silver tile]]s and [[gold tile]]s are much more beautiful, and also have 0.2 Cleanliness. However, they are ''much'' more expensive than sterile tile, giving them an entirely seperate use case - increasing general mood, not hospital effectiveness.

=== Room creation ===
As sterile tiles are relatively expensive, you may want to initially combine hospitals and research rooms to make the most out of the buff. Otherwise, you may want to make hospitals small, to save on resources. The smallest room size to maintain cleanliness for triage is 4x5, but a single blood spill will make it dirty every time, not to mention the small size of the room reducing patient capacity. Increasing the size of the room will proportionally reduce the cleanliness impact from each individual pile of filth. You can increase the size, which increases room Impressiveness, patient capacity, and the buffer against filth, as you can afford it.

Note that the floor under a [[door]] doesn't count for Cleanliness, so you don't need to place sterile tiles on a doorway. However, [[filth]] under a door ''does'' count, and colonists stepping from dirt or sand to flooring have a high chance to create filth, so players should still place ''some'' flooring under doors.

=== In combination with straw matting ===
Combining sterile tiles with [[straw matting]] can increase the cleanliness of a room, while decreasing the amount of filth. Put sterile tile under objects that won't be walked over, such as [[bed]]s, [[table]]s, and [[shelves]], and put straw matting elsewhere. [[Flower pot]]s or sculptures will offset the beauty from both tiles. Straw matting under the door is ideal as it won't reduce the cleanliness of the room but will prevent filth on that spot that can.

Another strategy is to use short entryways (roughly 3-4 tiles long) made of straw. Separate the entryway from the main room with doors so that the cleanliness and beauty penalties of straw don't hurt the room's impressiveness (the doors between the entryway and main room don't need to remain closed, however, as their only purpose is to create a separate room).

== Version history ==
* [[Version/0.12.906|0.12.906]] - Added
* [[Version/1.4.3523|1.4.3523]] - Beauty decreased from 0 to -1. Cleaning time factor added. Description changed from ''Sterile tiles with special cleanliness-enhancing properties. Extra-clean rooms improve outcomes in hospitals and research labs. This tile is very slow to build.'' to ''Sterile tiles with special cleanliness-enhancing properties. Extra-clean rooms improve outcomes in hospitals and research labs. This tile is very slow to build, but quick to clean.''

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