“Glacial Till” is a dense, unsorted mixture of clay, silt, sand, and rocks common in the Puget Sound. This soil type holds moisture tenaciously, leading to high hydrostatic pressure against foundation walls. Standard waterproofing methods often fail in these conditions. At Basement Expert, we design systems specifically for the PNW, using dimple boards and active diversion to manage water in heavy clay and till environments, preventing the cracks and bowing that lead to basement floods.