exterior foundation membrane waterproofing

https://blast-wiki.win/index.php/Expert_Basement_Leak_Repair_in_Guelph_and_Wellington_County:_What_Homeowners_Need_to_Know

Exterior foundation membrane waterproofing involves applying a durable, flexible barrier to the outer walls of a foundation before backfilling. This keeps groundwater from seeping through concrete or block walls, preventing basement leaks, mold growth, and structural damage over time. Contractors typically use rubberized asphalt or liquid-applied polymers. The key is proper surface preparation and drainage, so water doesn't pool against the membrane.