Jun 15, 2017 · The compost heap needs to be roughly 1 to 1.5m at base and 1 to 1.5m high. If composting material is high in carbon, such as tree branches, they need to be chipped (with a mulcher). Compost is turned from outside to inside and vice versa to mix it thoroughly. With the 18-day Berkley method, the procedure is quite straightforward: Build compost heap