What is a defining characteristic of unglazed tiles?

Unglazed tiles are defined by their porous surface, which is a notable characteristic that differentiates them from glazed tiles. This porosity means that unglazed tiles tend to absorb moisture and stains, which can be a consideration in their application in various environments. Due to their absorbent nature, unglazed tiles often require sealing to protect them from water damage and staining, enhancing their durability and longevity. This characteristic is particularly important in areas that may be exposed to moisture, such as bathrooms or kitchens, where a sealed surface can prevent water infiltration and maintain the integrity of the tile.

The other characteristics do not apply to unglazed tiles in a way that defines them. For instance, being non-porous is typically a trait of glazed tiles, which are finished with a glass-like coating. A glossy finish is also a hallmark of glazed tiles, while unglazed tiles generally have a matte or natural look. Lastly, the thickness of tiles can vary widely within both categories, and there’s no standard that makes unglazed tiles universally thicker than glazed ones. Thus, the defining characteristic of unglazed tiles indeed revolves around their porous surface and the necessity of sealing.