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HEARTHS The purpose of a hearth is to provide a safe non combustible base for your open fire or stove. The requirements of the building regulations are set out in Approved Document 'J' what follows is a brief précis. For a stove, unless the manufacturer specifies greater, we need a solid non combustible surface extending 225mm/9" in front of the appliance. This needs to extend 150mm/6" either side of the appliance. In most circumstances combustible materials must not extensively spread out under the hearth. The hearth should be at least 12mm thick if the appliance is freestanding and appliance is tested to heat the hearth to less than 100ºC (all of ours are). Most houses already have what we need and if not, it is usually relatively inexpensive to make them compliant.
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