The recent proliferation of new materials available for hearths and has redefined what a hearth means. A typical constructional hearth needs to be 225mm total thickness including a concrete base and decorative top. With the introduction of the 100°C regulation a new definition of hearth was introduced, the superficial hearth. This maintains that stoves projecting a hearth temperature of less than 100°C can be placed onto a combustible floor with a non-combustible material between them with a minimum thickness of 12mm, effectively setting the stove free from the fireplace and allowing you to place it almost anywhere in a room provided it projects less than 100°C downwards, and a 12mm superficial hearth exists between the stove and a combustible floor. If you have a stone or tiled floor down where you plan to place your stove then technically you already have a non-combustible material beneath the stove, thus negating the need for a full on construction hearth. However, building regulations also state that a hearth should be a clear demarcation of the heating area around a fireplace, fire or stove and so simply placing on top of this would not conform. Instead a way around this would be to use a stone floor plate. At around thicknesses as low as 6mm thick these plates a clean visual guide to the hearth area, and clearly denotes a visual demarcation of the fireplace, stove heating area in compliance with regulations.