The insured building sustained damage at the roofing and roof structure. Fire loss at the school’s gymnasium reportedly started by fireworks.
Summary of Findings:
Roofing consists of an EPDM roof membrane over rigid insulation supported by 1 ½” wide ribbed acoustic metal decking. Steel roof joists support the metal deck and are set approximately 26’ clear of the gymnasium floor, bearing on the east and west CMU walls. From above the roof, the loss area was patched with new roofing and insulation over an area of 20’x25’ near the west parapet wall. A location between the patch area and west parapet was observed with holes in the roof membrane and soft spots in the insulation.
From below, the painted finish of decking has flaked off and steel of the decking has corroded and warped below the area of patched roofing. Discoloration from heat or soot and smoke residue occurs throughout the roof structure. Top chords of the roof joists supporting the damaged deck area have had paint charred and flaked off. The factory finish has also been damaged in small areas of the joists where the highest heat from fire was observed to occur. Slight bowing at the joist top chord has occurred at 2 joists where this occurs.
The adjacent steel joist to the north has paint charred and flaking from the top chord of steel joist. The remaining adjacent joists have or soot and smoke residue in the area of fire loss, diminishing across the gymnasium roof structure. Refer to the enclosed Photo Report for sample images of damage observed during inspection.