Good Bond with Bricks

Strong mortar mixes with a high cement content have a greater proclivity to drying shrinkage, which results in the mortar joints effectively shrinking away from the bricks. The fine cracks between joint and brick undermine structural strength and allow rain to penetrate, with the potential for frost damage during winter months. Some bricks, such as concrete or sand/lime bricks, also display high rates of drying shrinkage and such problems are exacerbated if they are laid in harsh, strong mortars.