Yakisugi is not just beneficial to the looks of wood. It is also a very great know-how for improvement of various physical and constructional characteristics of any timber that is treated. In this case, besides improving the finish, this Japanese technology really adds to what is already an almost complete package in the Siberian Larch.
You might be thinking that there is not too much where you can improve if the timber is already quite rot-resistant, right? Wrong.
Even though it has some endurance from the get-go, after carbonisation, wood and more precisely burnt Siberian Larch cladding boards become way superior to their regular wood counterparts. Firstly, it is fireproofing. Regular dry wood is quite dangerous and poor in terms of fire retardation. However, Yakisugi is the process of treating individual planks with scorching flames. After they are covered with a carbonised layer, the pieces of timber, in this case, the Siberian Larch becomes almost fireproof.
Secondly – waterproofing. As we’ve already established, this is a smaller concern to the Siberian Larch because it is pretty rot-resistant, but still, time does take its toll and rot cannot be entirely negated. What wood charring does it actually shrinks and closes the many individual pores that are on the surface of the wood. Those pores, if not shrunk and closed, absorb water and this is not at all valuable to construction material, but necessary to a live tree. It is also worth mentioning that even though charring turns natural timber into waterproof timber by covering it in a hydrophobic layer, Shou Sugi Ban does not lose breathability.
And finally, we have to mention resistance to pests and parasites. Regular forest wood is commonly affected by parasites. Natural, untreated wood, when used in façade building is also a frequent target for termites, slugs, etc. Charring forces all nutritional materials to evaporate; thus, leaving wood unaffected by vermin.