Epoxy vs Polyurethane foam for injections?
Epoxy can be injected into a structural or non-structural crack. All structural cracks should be injected with an Epoxy. A horizontal crack mid-wall or cracks over 1/4 inch wide are considered structural cracks. If a foundation crack is narrower widths, mostly vertical, and leaking which is very common down from a window then a Polyurethane is a good economical choice that will stop water permanently.