What needs to be protected below a roof opening?
Before roof material is lifted, identify the area beneath the proposed work and the items or equipment the owner wants protected. Hangars can have large interior volumes, but the roof span, door geometry, aircraft layout and operation at a particular building must be confirmed. We locate the reported water, inspect the plausible path above it and define the opening that can be examined and closed. If the exposed insulation or deck is wet beyond the first boundary, show the owner before expanding removal.
The facility representative determines which aircraft or equipment must be moved, who can authorize movement and how an open work area is isolated. Roofing staff should not assume aircraft readiness, flight schedules, maintenance procedures or clearances from a hangar label. A temporary cover can reduce immediate exposure while a decision or another trade is pending, but it needs a stated limit and a planned path to permanent restoration. The closeout should say what roof area was sealed and what remains open.