When fitting Siberian Larch cladding it is important to allow for board movement. In the winter the boards will expand by up to 4mm due to moisture content.
It is very important to allow for this movement, the cladding should be fitted with a 4mm expansion gap. We mill Larch with a 14mm long tongue to ensure there is always sufficient engagement. We also recommend fitting with stainless steel screws.
The picture shows our secret fix Siberian larch Cladding with a 14mm tongue engagement and a further 10mm overlap to cover the fixings.