Siberian larch is the only pine tree whose wood is considered to be a hardwood. The firmness of the wood according to Brinell is 3,2 (oak has 3,9). That is why buildings of this larch last for centuries. There are a lot of buildings made of larch, whose age is over 500 years. (one of the examples is in Venice; the other example are pilings of the Trojan bridge over the Danube).The growing conditions of the larch in Baikal and the Angara and Yenisei river regions make the wood ecologically pure and it doesn’t contain any allergens. During the whole exploitation period it releases phytoncides, which prevent viral infections and colds and wonderfully affect nervous system while inhaling.The principlal of glued beam manufacture is gluing planks gathered in packets (slats), dried beforehand, planned and sorted. Pinewood is mostly used for manufacturing such planks, pine and larch in particular.