Tongue and groove panel

A roof construction for a building comprising:

• a frame structure;
• and
• a plurality of composite wood panels attached to the frame structure, each panel having parallel first and second longitudinal edges, and parallel upper and lower faces, and comprising:
• a groove formed along the second longitudinal edge, a complementary shaped tongue formed along the first longitudinal edge;
• and
• a first surface extends from the tongue to the upper surface and forms a generally obtuse angle, α, with the upper surface, a matching surface extends from the groove forming a generally acute angle, β, with the upper surface, and the sum of α and β is from about 175° to less than about 180°;
• wherein
• the first angled surface, the second angled surface, and the top surface of the tongue define an upper space that forms an acute angle, θ, with the upper face of each panel.

A method of making a tongue and groove panel comprising the steps of:

• (a) providing a quantity of wood material present in the form of strands;
• (b) blending the wood strands with binder;
• (c) forming the wood strands into a mat having an upper surface, a lower surface and a core layer, the upper surface and lower surface of wood strands substantially oriented in a first direction and the core layer wood strands oriented in a second direction, wherein the first direction is substantially different from the second direction;
• (d) pressing the mat in a heated press;
• and
• (e) forming a tongue profile along a first longitudinal edge of the pressed mat and a groove profile along a second longitudinal edge of the pressed mat to form a tongue and groove panel;
• wherein the panel further comprises a radiant barrier material secured to the lower surface, and a barrier layer secured to the upper surface.