Expansion joints are where two substrates come together on a building and are designed to allow the building to expand and contract with the atmosphere without causing damage to its substrates. Expansion joints, especially vertical, are often where two slabs of concrete meet and therefore a foam backing rod and caulking area required. Should the expansion joints not be maintained, your building runs the risk of damaged substrates, water penetration, and possibly energy issues.
Expansion joints can be found on almost all sizeable commercial buildings. Expansion joints are a mid-structure separation created in order to relieve stress put on the building from natural building movement. Joints must remain watertight, but flexible over time. Like the majority of important building parts, these expansion joints require maintenance, and the maintenance Major Painting offers is joint caulking.