A building is often less secure during construction. There may be an unguarded wall opening, a makeshift barrier, or an unlocked door somewhere. Collaborate with the contractor to minimize opportunities for entry into the school on nights and weekends. This is also a liability matter, one that should be taken seriously. Look for signs of water.
Rain water seeping into the building is a real possibility, particularly during roof repairs.
But rain water can also enter through unfinished walls, windows, and joints. Unless openings are readily visible, there's not much you can do except be prepared to act when a leak is discovered. Instruct school staff to be alert for signs of wetness or water damage and to report these occurrences immediately. Water leaks can destroy equipment, short-circuit electrical wiring, cause structural deterioration, and promote mold and mildew. Minimize noise distractions.