Building panel

A building panel of composite wood materials adapted to cover intersecting surfaces on opposite sides of an apex at the hip or ridge of a roof or corner of a building includes a substantially flat back face and an irregular outer weather face resulting in variations in panel thickness at different positions on the panel face. The panel is provided with a V-shaped groove formed in the back face and extending along an axis adapted to overlie the apex of intersection on application of the panel on a building and also includes a V-shaped groove formed in the irregular outer weather face directly opposite the V-groove in the back face defining therebetween a panel web of substantially constant thickness between the apexes of the grooves that is less than the average nominal thickness of the panel between the faces. These grooves facilitate the bending of half portions of the panel on opposite sides of the grooves to fit against intersecting surfaces on a building roof or wall corner.