Conor Fleming opened the scoring with a penalty for Castletroy but Jason Kiely pulled Munchin's level shortly after. A try by Mark O'Mara converted by Fleming edged Castletroy back in front five minutes from time but a second penalty from Kiely left the Corbally College side trailing by four points at the interval.
Seven minutes into the second half Fleming extended Castletroy's advantage with a second penalty to 13-6. Number eight David Rowsome barged over for a try for Castletroy with seven minutes remaining. Fleming kicked a third penalty to wrap up the scoring.
Castletroy College: Oisin Kelly; Shane Hogan, Ronan McDonnell, Colum Carroll, Sean McBrearty; Jamie Heuston, Conor Fleming; Joey Conway, Mark O'Mara, Conor Myers; Evan Slattery, Eoin Hourigan; Darragh O'Neill, Niall O'Shea (capt), David Rowsome. Replacement: Alan McDonogh, Cathal Lee, David Kennedy, Sean English, Luca Ridder, Patrick Tuite, Eoghan Carew, Shane Daragh Mullins.
St. Munchin's: Jonathan O'Hanlon; Cameron Stephenson, Sean Kelly, Matthew Lyons, Marcus Browne; Jason Kiely, Brian Bennett; Emmett O'Callaghan, James Burke, Ronan Kirwin; Sean Hayes, Kieran McGuirk; Adam Moloney (capt), Aaron McNamara, John Foley. Replacements: Hugo McDonald Christian Brul, Colin Kelly, Shane Corbert, Adam Murphy, Kieran Galvin, Adam Guerin, Evan O'Connor
Referee: Mark Connolly (M.A.R.)