Waterproofing
Waterproofing keeps water out of basements, foundations, and below-grade spaces using interior drainage, exterior membranes, sump pumps, and sealants. It manages both water intrusion and the pressure behind it, and is priced per square foot.
How waterproofing is done
- Identify the water source and entry points
- Choose interior or exterior waterproofing
- Excavate or open the interior perimeter
- Install drainage, membrane, or sealant
- Add a sump pump and discharge
- Test and backfill or finish
What homeowners should know
- Ask whether the fix targets the water source or just symptoms
- Understand interior versus exterior approaches and their trade-offs
- Confirm a sump pump with battery backup if recommended
- Address grading and gutters as part of the solution
- Get the warranty terms in writing
Permits, timelines & things to consider
- Exterior excavation waterproofing may require permits
- The chosen method and severity drive cost per square foot
- Interior systems manage water; exterior systems keep it out
- Grading, gutters, and downspouts are part of a real fix
- Hydrostatic pressure and drainage must be addressed, not just sealed
Frequently asked questions
What is the difference between interior and exterior waterproofing?
Interior systems collect and pump water that enters, while exterior systems excavate and seal the foundation to keep water out entirely at higher cost.
Do I need a sump pump?
If water collects under or against the foundation, a sump pump with a reliable discharge and ideally battery backup is often part of the solution.
Will sealant alone stop a wet basement?
Sealants can help with minor seepage but do not manage hydrostatic pressure or drainage, so persistent water usually needs a drainage system; pricing is per square foot.