ORIENTED STRAND BOARD PRODUCT

摘要

The present invention relates to an oriented strand board, OSB, product such as a panel formed from a plurality of pressed layers. The layers include a top layer, a core layer and a bottom layer, each layer comprising a mixture of wood flakes and wood fines, wherein the volume ratio of wood fines to wood flakes differs between the layers and wherein the air permeability of the product at 50 Pa. is between 0.0005 and 0.0018 m 3 /m 2 /h/Pa.