Roof panel for protection against airborne threats

A method of constructing a system for protecting a top of an enclosure from falling objects, the method comprising:

• attaching a first support structure to a first edge of the enclosure proximate to the top of the enclosure;
• attaching a second support structure to a second edge of the enclosure proximate to the top of the enclosure, the second support structure generally parallel to the first support structure;
• constructing a plurality of roof protection sections, each roof protection section comprising a frame having a first end channel and a second end channel and a plurality of parallel support beams, each support beam extending from the first end channel to the second end channel, each support beam and an adjacent support beam forming a pair of adjacent support beams, wherein constructing a plurality of roof protection sections comprises:
• attaching a first panel to the frame, the first panel attached to each of the support beams along a first side of the frame;
• inserting a flexible bag comprising woven, high-tensile strength fiber between the support beams in each pair of adjacent support beams, each flexible bag extending substantially between the first end channel and the second end channel;
• filling each flexible bag with a selected material and closing each flexible bag;
• and
• attaching a second panel to the frame, the second panel attached to each of the support beams along a second side of the frame;
• and
• mounting the roof protection sections between the first support structure and the second support structure with the first end channel of each roof protection section secured to the first support structure and with the second end channel of each roof protection section secured to the second support structure.