Straw matting reduces the amount of filth from any pawn, animal or human simply walking or being on it by 95%. It does not prevent firefoam, blood, or other "created" filth. It has a -0.1 Cleanliness multiplier.
It is also very flammable. It not just by far the most flammable flooring, but one of the most flammable structures in general. Precautions should be taken in case of fire in areas where this is a risk, but it can also be exploited by making intentional fire traps.
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This type of floor should be placed in any enclosed area that animals, especially farm animals, are allowed to enter. Care should be taken however - while it may be tempting to give any hauling animals paths to the warehouse where they will create minimal filth, it also essentially provides a wick directly to the same warehouse full of valuable items in the event of a fire.
A compromise would be to use matting with "fire breaks", either non-flammable walls and doors or areas of at least 3-tiles wide of non-flammable flooring at least 3 tiles wide, to minimize the spread of any fire.
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For the purposes of cooking, as long as a room's cleanliness is above -2.0, then the chance of food poisoning will not increase. Straw matting's -0.1 is significantly above this threshold. As straw matting only creates 5% of walking filth, it is a very work efficient way to creating "clean enough" kitchens. It takes much longer to reach -2.0 cleanliness with straw than with regular floor.
You can even pair this floor with steel or sterile tiles in areas where filth does not or cannot accumulate, such as under stoves or chairs. This increases the overall base cleanliness of the room, while retaining the filth repellent nature of the straw matting in traffic areas.