Disclosed is a peripheral retention system for a deck (4) consisting of slabs or planks that are arranged on a support structure comprising blocks (6) for supporting cross-beams (18) on which the slabs or planks are arranged. Said system comprises a top profiled section (1) for horizontally retaining a peripheral strip (3), and a bottom profiled section (2) for vertically supporting the strip (3), said profiled sections (1, 2) comprising means for securely connecting same to the support structure of the deck (4).
