FDNY firefighter Weaver Debe is headed home to Haiti on Thursday — and he’s bringing 15 of his fellow Bravest with him to help build a school for a local orphanage. But they won’t be working alone. Along with his FDNY muscle, Debe’s traveling with union ironworkers and carpenters from the Building and Construction Trades Council of Greater New York and two retired Port Authority Police officers. All of them are part of HEART 9/11, a nonprofit disaster relief organization that aims to help suffering communities with the same spirit the world gave to New York after the Sept. 11, 2001 terrorist attacks in lower Manhattan.