Why do car park expansion joints leak?

Car park expansion joints leak due to the extreme dynamic loads they suffer. Vehicles braking and accelerating over the joint exert shear forces that rip standard sealants apart. Combined with UV exposure on top decks and thermal movement, this leads to failure. Once the joint fails, salt-laden water drips onto cars below and attacks the concrete reinforcement. We use specialized, heavy-duty armoured joints or Hypalon systems designed specifically for this harsh environment.