The iliofix is distinguished by a low specific loading of less than ten kilograms per square meter, making it suitable for statically sensitive roof structures. Stiffened metal back sheets and cross bracing made of tubular profiles are said to provide good system stability. Inlet and outlet slits at the upper and lower edges of the module ensure it is well ventilated from behind.
The framework needs only a little additional ballast at its edges, since its aerodynamic design presses it onto the roof surface when the wind blows. The standard angles of tilt are quoted as 18 or 20 degrees, while other angles are also possible.