ROOFING PANEL Russian patent published in 2007 - IPC E04B7/20 

FIELD: construction, particularly roofs consisting of self-supporting slabs.

SUBSTANCE: roofing panel comprises upper layer made of corrugated board stiffened with truss structure in span area. The truss system is secured to rigid end beams at panel supports. The beams are connected to corrugated board and made as rigid transversal strips secured to lower flanges of corrugated boards. Truss members are formed of steel strips with bent ends engaging transversal strip. Rigid plugs are inserted in orifice defined by bent ends of truss members and upper corrugated board flange. The plugs are secured to upper corrugated board flanges.

EFFECT: simplified structure and increased load-bearing ability.

2 cl, 2 dwg