How do you waterproof a concrete block retaining wall?Start By: Waterproofing Preparation: thoroughly cleaning the retaining wall once the wall has been exposed by excavation. To fill any gaps, bag the wall by using sand & cement mix. Let dry. Detail the footing with Geotextile Bandage (buy here). Apply two coats of Liquid Rubber waterproof membrane allowing to dry … Continue reading Waterproofing Retaining Walls