Christians opened the scoring after six minutes with a try from Ronan Barry which Joe Holland converted. However indiscipline cost the Cork side dearly as Paul McEvoy slotted over penalties on 9, 18 and 31 minutes to give Rockwell a 9-7 lead.
Two minutes before the break Holland got in for a second Christians try but McEvoy was on target with his fourth penalty to level the scores on the stroke of half time.
Christians dominated the second half and tries by Barry, Robert Clune and Darragh Dunne with Dunne converting all three made it 33-12 in favour of the Cork school.
Shane Buckley got in for a consolation try for Rockwell late in the game and McEvoy converted.
Scorers: C.B.C.: R Barry 2 tries, D Duggan try, 3 cons, J Holland try, con, R Clune try.
Rockwell: S Buckley try, P McEvoy 4 pens.
Teams: C.B.C.: R Clune; E Oâ00Donnell, B Oâ00Leary, J Holland, G Mackessy; D Dunne, B Slater; C Corkery, K Stokes, D Attridge; B Hayes (capt), S Hanbridge; E Doyle, R Barry, W Ryan.
Rockwell: Paul McEvoy; Kenneth Oâ00Dwyer, Gavin Ryan, Brian Smith, Willie Oâ00Connor; J.J. Hanrahan, Ethan Ahearne; Tom Doyle, Luke Oâ00Donnell, Brendan Cullinane; Shane Oâ00Flynn, Shane Buckley; Stephen Maguire, James Nolan, Paddy Butler (capt).
Referee: Peter Fitzgibbon (M.A.R.)