Interior vs Exterior Basement Waterproofing

Exterior and interior basement waterproofing methods each have their pros and cons. Exterior waterproofing is more complicated and expensive but prevents water from entering in the first place. Interior systems manage water that has already seeped in.

Exterior waterproofing requires excavating around the foundation to access the outer walls. Hydrostatic pressure is relieved, cracks are sealed with waterproof compounds, and drainage improvements are made. This extensive process needs experienced professionals to obtain good results.

Interior basement waterproofing systems are designed to manage water seepage by quickly draining groundwater before it accumulates inside. This approach relies on interior sealants and drainage systems.

Interior waterproofing typically involves installing a drainage system, like a French drain, around the basement interior. Pipes collect water and direct it to a sump pump for discharge outside. Interior systems are a more affordable DIY project compared to exterior work.

By immediately diverting water incursion, interior drainage systems prevent puddles or flooding from excessive groundwater. Installing these systems along interior basement walls provides an affordable waterproofing option compared to excavating for exterior solutions.

Interior drainage requires less labor and fewer materials than exterior waterproofing. While not an impermeable barrier like exterior sealants, interior systems offer a convenient and cost-effective way to control basement moisture. Drains and pipes whisk water away and a properly sized sump pump ejects it outside. This active water management helps keep basements dry at a lower cost than completely waterproofing foundation walls themselves.

While exterior waterproofing fortifies the outer foundation walls, interior drainage manages any moisture that still gets in. Most experts recommend a combined approach for best results. Exterior waterproofing blocks water intrusion while interior systems provide backup protection if leaks occur. Using both interior and exterior waterproofing methods provides comprehensive defense against wet basements.