Abstract: The present invention relates to a plateformed building element (1), intended for the construction of floor structures and/or walls and consists of wood or some other fibrous material with members (2) connecting inner and outer sides (5, 6) positioned at a mutual distance (A). Said connecting members are formed from plateformed lamellae (2), distributed essentially along the whole surface range of the intended building element. They extend incliningly and/or curved in zigzag patterns and are distributed along said building element (1) in pairs (2, 2) forming parallel channels (51) therein.