A Wall tie, also known as a brick tie, is a critical component used in cavity wall construction to connect the two leaves (inner and outer walls) of a cavity wall, ensuring they act as a single structural unit. These ties are typically made from corrosion-resistant materials like stainless steel to prevent rust and ensure longevity. Proper installation of wall ties is essential to prevent structural issues such as damp penetration, masonry cracks, or even the collapse of the outer masonry leaf.