Building Regulation requirements
Fireplace recesses
minimum dimensions of solid non-combustible material
CONSTRUCTIONAL HEARTHS are required for an open
fire, a gas flue where the flame is less than 225mm
above floor finish, a solid fuel or oil burning appliance
where the temperature of the floor may exceed 100°C. If
below this temperature then appliance may sit on a noncombustible
board or tiles – both at least 12mm thick.
Hearths must be at least 125mm thick of
solid non-combustible material which
may include the thickness of any noncombustible
decorative surface.
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