Flat roofs leak.  There's no other way to put it.  Flat roofs leak.  And it's not the roof's fault.  Commercial buildings always have other contractors on the roof, whether it be HVAC personnel, grease hood repairs or even new tenant buildouts.  

We pride ourselves on not only finding and repairing the leak, but provide our analysis of what exactly caused it so our client can bill the appropriate party.  All tenants should not have to pay for another tenant contractor's negligence.