The holders led 2-8 to 1-7 at the break, with Conor McLaughlin netting inside three minutes and Mickey McCann adding a second.
Paddy Hannigan was the MacCumhaill’s goalscorer.
Thanks to Lee Henderson’s eight points in all, MacCumhaill’s were just two points down with 10 minutes left, however, Ronan McLaughlin sealed the deal late on with a decisive goal.
Scorers for Burt: N Campbell 0-7fs, M McCann, C McLaughlin 1-2 each, R McDermott 1-1, E McDermott, J McGrath 0-1 each.
Scorers for Sean MacCumhaills: L Henderson 0-8 (6fs), P Hannigan 1-1, P Sheridan, B Lafferty, G Brown 0-1 each.
BURT: P Burns; D Grant, M McGrath, K Glenn; B Harrigan, J Boyle, C Dowds; A McDermott, R McDermott; E McDermott, S Boyle, S Gillespie; M McCann, C McLaughlin, N Campbell.
Subs: P McDermott for Harrigan (40), P Strain for Gillespie (45), D McLaughlin for C. McLaughlin (50); J McGrath for Boyle (60).
SEAN MacCUMHAILLS: PJ Brown; A Patton, J McGhee, Oliver McGroarty; Ogie McGroarty, J Donnelly, Gary Brown; P Sheridan, C Matthewson; L Henderson, P Hannigan, D White; B Lafferty, G Grindle, M Timoney.
Subs: Gavin Brown for Timoney (35), F Culhane for Lafferty (45) , G Cunningham for Ogie McGroarty (45).
Referee: E Hassan (Derry).