Waterproofing in San Mateo, CA

San Mateo runs from bay-level flats to steep hillside lots, and the two produce entirely different water problems. Down near the bay it is groundwater and a high seasonal water table pressing against below grade walls. Up on the hillsides it is surface water and subsurface flow moving downslope and collecting against retaining walls and garage backwalls.

Hillside properties usually need drainage as much as membrane. We install or correct retaining wall waterproofing together with a drainage layer and a discharge path, because on a slope the membrane alone just relocates the problem to whichever point is lowest.

For finished basements and garages already showing moisture, we start with diagnosis — hydrostatic pressure, surface water, cove joint failure, and condensation all look similar on a wall but call for completely different repairs.