The Expansion Joints are installed at set locations to assist with the creation of a weakened plane where the concrete material is able to crack in a straight line. This creates an aesthetic appearance as the crack occurs underneath the surface of the concrete.
If you are utilising concrete that will join a current structure, you should look to include an expansion joint. This includes, but isn’t limited to, footpaths connecting to a driveway, the junction section of a footpath, the joining of a floor slab to a staircase or column, a building or kerb or any similar construction.
Separate to this, if you have a large slab, expansion joints are required at set intervals. If the slab is unable to be completed in a single pour due to its large size, expansion joints allow the slab to be broken up into individual sections and poured one at a time.