(One Hundred Questions on #60Waterproofing): Apart from structural cracking (such as shear-induced cracks) that causes water leakage, what are the most common types of joint systems that cause leakage?

Answer:

(i) Construction Joint — A gap created by the overlap of new and old concrete or the gap between RC and different materials.
(ii) Movement Joint — Due to the contraction and expansion of concrete to accommodate the different internal and external stresses exerted by the exterior wall, the gaps (GAP) that are reserved are as follows:
(1) Expansion Joints.
(2) Contraction Joints — are the gaps designed by the interruption of reinforcement or concrete.