The big news before the game was the loss of top scorer Jamie McGonigle for the Roesiders after the on-loan striker was ruled out with a hamstring injury picked up in the midweek draw at Larne.
McGonigle's stand-in, John Butcher, showed his qualities inside four minutes as he jinked past his marker on the edge of the Crusaders box before forcing Shea Callister into a save with a low drive.
The visitors have struggled for goals of late, scoring only once in their last four league games and they came close in the 10th minute as Lloyd Anderson got his head to Owen Wardell's inswinging cross, but it flew the wrong side of the post.
The Roesiders should have edged in front on 19 minutes as the Boorman brothers combined with Ruairi picking out Tiarnan in the box, but the centre-back's diving header flew over the bar.
Crusaders started to impose themselves on the game as Dunlop worked some space for himself before drilling a shot across the face of goal, which Gallagher did well to parry away.
Back came Limavady with Tiarnan Boorman, fresh from his earlier sighter, clipping the top of the Crusaders crossbar with another header from a Lewis Tosh corner.
The deadlock was finally broken five minutes into the second half a Dunlop was fed by Jewitt-White before drilling a low shot into the corner past a static Gallagher.
Roesiders boss Paul Owens threw on Leon Boyd and Duffy to try and find a way back into the game with the latter crashing an effort off the outside of the post just past the hour mark.
The hosts were left scratching their heads in disbelief as to how they had not levelled things up on 68 minutes after Lafferty had headed Wilson's deep cross back across the face of the Crusaders goal.
Somehow both Butcher and Philip Lowry failed to make contact with the ball as they slid in with the goal at their mercy.
With eight minutes to go Crusaders all but wrapped up the win as Wardell cut in from the right-hand side before curling a superb effort past Gallagher into the top corner.
But Limavady weren't done just yet as Duffy lashed in from outside the box to renew his side's hopes of rescuing a point.
Just three minutes later those hopes were extinguished again as Rocks found the net with another strike from outside the box.
The visitors rubbed further salt into Limavady's wounds two minutes into additional time as Dunlop skipped past several challenges in the box before poking beyond Gallagher to finally seal the points.