Often suitable for
- Damp or leaking basements
- Below-grade additions
- Foundation transitions and penetrations
Foundation
Foundation & Basement Waterproofing
Source-first moisture control for below-grade walls, slabs, joints, and drainage.
WHI investigates grading, drainage, cracks, joints, penetrations, wall construction, and hydrostatic pressure before recommending exterior membranes, drainage improvements, targeted injection, interior management, or a coordinated system.
Not a shortcut for
- Cosmetic covering over an active source
- Structural movement without engineering review
Methods considered
- Exterior membranes and protection
- Drainage and termination detailing
- Targeted crack or joint treatment
- Interior water-management systems when appropriate
Warning signs
- Water lines or efflorescence
- Musty odor or recurring dampness
- Leakage at wall-floor joints
- Cracks that change or admit water
Choose your path
Foundation & Basement Waterproofing for homes and businesses
Start with the building and operating needs. Inspection findings—not a generic package—determine whether repair, restoration, or replacement belongs in the written scope.
Residential journey
- Basements, crawlspaces, and additions
- Recurring seepage diagnosis
- Pre-finish moisture planning
Commercial journey
- Below-grade occupied space
- Elevator pits and service rooms
- Foundation repair coordination
Suitability checks
- The source may be surface water, plumbing, groundwater, condensation, or a combination.
- Active structural movement should be reviewed before waterproofing.
- Discharge and drainage work must comply with local rules.
Transparent planning
What drives foundation & basement waterproofing cost?
These are scope drivers, not an online bid. Measurements, condition, code, access, selections, and hidden damage must be verified before WHI can provide a project-specific written estimate.
Cost drivers
- Excavation depth, access, shoring, and restoration
- Foundation material and condition
- Drainage, sump, and discharge requirements
- Crack, joint, penetration, and utility complexity
Typical project sequence
Duration is confirmed after scope, lead times, permits, weather, access, cure requirements, and hidden-condition allowances are known.
- Site and moisture investigation
- Scope, drainage plan, and permits if required
- Excavation/preparation or interior access
- Membrane, drainage, testing, protection, and restoration
Scheduling
Scheduling depends on investigation findings, drying or substrate moisture, weather and cure windows, access, permits, and coordination with drainage, concrete, roofing, or interior trades. WHI separates emergency source control from permanent waterproofing.
Maintenance
- Keep grading, gutters, and discharge paths functional.
- Test pumps and alarms according to manufacturer guidance.
- Watch repaired cracks and joints for movement or renewed moisture.
Prepare and protect
Emergency steps and estimate checklist
If water is entering now
- Keep people away from standing water near electrical equipment, unstable finishes, or contaminated water.
- If safe, stop the water source and move contents; do not open walls or enter flooded confined spaces.
- Photograph conditions, note weather and timing, and call emergency services for life-safety hazards.
- Request source control and temporary protection before cosmetic repairs or reconstruction.
Compare written scopes
- Identify the water source—not only the visible stain
- Record substrate condition and moisture findings
- Define preparation, transitions, drainage, terminations, and protection
- Confirm cure time, access restrictions, testing, and closeout
- Read warranty coverage, exclusions, maintenance, and installer requirements
Warranty questions
Ask who issues each warranty, what it covers, when it starts, how coverage statements are made, whether it transfers, and which maintenance, registration, or inspection conditions apply.
Get a condition-based recommendation
Tell WHI what you see and how the building is used. We will help set the next step, document the scope, and explain options without pretending an uninspected project has a fixed price.