Which is better, epoxy injection or urethane injection? That is a little like asking which is better a 1/2 inch wrench or a 3/4 inch wrench. The answer is whichever one is the Right Product for the Right Job. This blog will explain this in more detail.
Epoxy injection should always be used in cracks where two sections were never meant to be separated. For example a crack that took place in a piece of concrete that was intended to be monolithic (single pour), or where two sections of wood need to be bonded together. These repairs should always be by epoxy injection.
Urethane injection should always be used where the two separate members (pieces of structure) were never intended to be attached firmly but need to be waterproofed. Consider for example, a sewer pipe and a basement wall (between a pipe and the concrete where it passes through the concrete).
Engineering determinations are required in places like a cold joint or the space between two sections of precast concrete. If the structure is better off by the two members being bonded together, then epoxy injection should always be used. If the structure is better off by the two members being able to have slight differential movement from each other and/or should never be bonded together, then urethane injection should always be used.
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