A build-up of hydrostatic pressure happens when there’s excess water in the soil around the foundation that can’t drain off. In other words, there is a lot of water in the soil and poor drainage.
Hydrostatic pressure – if it’s not relieved – pushes against foundation walls and can cause them to crack and even bow inward. Hydrostatic pressure can also push water through cracks in a brick foundation wall – even those that aren’t visible to the naked eye – and into your basement or crawl space.
Controlling groundwater is the best way to ensure hydrostatic pressure can’t build up in the soil around the foundation. The best way to do that is via a drain tile system.