Details Uses: Cladding, Shiplap Size: 25mm x 150mm Nominal (20mm Thick x 130mm Cover) Machining: Machined Rebated Species: Unsorted Siberian Larch Treatment: Untreated Siberian larch has a tendency to attract surface non-wood destroying mould, fungi and this tends to blend in as the timber weathers, if larch is exposed like most timber species it will turn grey and a number of factors cause the weathering process.