Firefoam

Firefoam is a flame-retardant foam that extinguishes fire on contact and prevents fire from spreading on tiles it covers. It also gives the Covered in firefoam status to pawns standing inside, reducing Flammability to 0%. This status lasts for 900 ticks (15 secs) after being applied, if applied again, the timer resets to 15 seconds and doesn't stack.

Firefoam is considered filth, creating a significant beauty and cleanliness penalty. Colonists will automatically clean firefoam in the home area, and it will be washed away with rain or snow.

The following release firefoam:

• Firefoam popper
• Firefoam shell
• IED firefoam trap
• Firefoam pop pack
• Foam turret
• Paramedic
• Foam spew gene ability

Firefoam is generally released in an explosion. This explosion does no damage. The explosion will put out pawns and animals that are on fire, though the foam coating the ground does not actually extinguish fires.

Analysis

Firefoam can be left in place long term as a defense against inferno cannon and other incendiary weapons. To do so the area must be roofed and be removed from the home zone to prevent pawns cleaning it.

Trivia

• To create firefoam in development mode, use the "T: Explosion" command and select extinguisher.

Gallery

The following images show the Area of Effect for each firefoam source. Note that the popper, IED, and a single shell cooking off, all have the exact same radius.

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  IED firefoam trap radius

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  Firefoam shell radius when fired, when a single shell cooks off, and when a stack cooks off, from smallest to largest.

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  Firefoam popper radius

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  Firefoam pop pack radius

Version history

• 0.13.1135 - Added, alongside the firefoam popper.
• ? - No longer slows pawns by 25%, nor depletes shield belts.
• 0.18.1722 - Firefoam shell added.
• Biotech DLC Release - Paramedic and Foam spray added.
• 1.4.3523 - Standing in firefoam now causes the Covered in Firefoam hediff, reducing flammability of a pawn. Firefoam pop pack and foam turret added.