Understanding Waterproofing Warranties
Waterproofing is a critical component of any building's foundation, ensuring protection against water infiltration. However, even with the best intentions, achieving a completely watertight foundation is challenging—especially in high groundwater conditions. This is where waterproofing warranties come into play.
While many assume that any waterproofing failure is covered by a manufacturer's warranty, the reality is more complex. Over time, manufacturers have refined their warranties to align with project-specific needs and liability management. Understanding the different types of warranties available and their limitations is essential for property owners, builders, and designers.
What is a Waterproofing Warranty?
A waterproofing warranty is a formal agreement that defines the level of coverage provided in the event of defects in the waterproofing system. This coverage can vary depending on how "leakage" is defined and who is responsible for repairs. Some warranties cover only material defects, while others include labor and associated costs.
When a waterproofing issue arises, the response from the warrantor may range from comprehensive investigations and laboratory testing to straightforward repairs of visible leaks. Understanding the types of warranties available helps set realistic expectations for liability and resolution.
Common Types of Waterproofing Warranties
1. Materials-Only Warranty
Covers defects in waterproofing materials caused by manufacturing faults.
Does not include labour, access costs, or operational disruptions.
Typically provided at no extra cost.
2. Performance-Based Warranties (NDL & Limited Coverage)
Covers both material defects and necessary repairs.
"Limited" warranties cap the coverage amount, while "No Dollar Limit (NDL)" warranties cover full repair costs.
May require manufacturer involvement during design and installation, adding to project costs.
3. Contractor Warranty
Guarantees workmanship for a set period (usually 1-5 years).
If failure occurs after this period, the owner must rely on any existing manufacturer warranty.
4. Implied Warranties
These include general quality assurances, such as suitability for a specific use.
Often excluded in manufacturer warranties unless explicitly agreed upon.
Factors That Impact Warranty Coverage
1. Approval & Validation
Some performance-based warranties require manufacturer approval of design documents before construction begins. While this can extend timelines, it often provides better coverage.
2. Construction Schedule Impacts
Securing a robust waterproofing warranty might require additional inspections, manufacturer meetings, or third-party approvals—potentially affecting project timelines and costs.
3. Triggers That Void Warranties
Warranties may become invalid due to:
Ownership changes.
Repairs by unauthorized contractors.
Use of non-approved materials or methods.
Failure to notify the manufacturer before repairs.
4. Collateral Damage Limitations
Most warranties do not cover:
Interior finish repairs.
Building operation disruptions.
Structural damage caused by waterproofing failure.
5. Repair Methods
Warranty-related repairs are often dictated by the at-risk party, leading to possible compromises in material selection and repair timelines.
The Misconception About Waterproofing Warranties
Many property owners assume that waterproofing warranties guarantee complete protection against leaks. However, most below-grade waterproofing failures occur due to site conditions, construction errors, or material limitations—factors that warranties may not fully cover.
For example, hydrostatic pressure from high groundwater levels can cause leaks even when a waterproofing system is installed correctly. In such cases, warranty claims may only cover replacement materials, while excavation, labor, and operational losses remain the owner's responsibility.
Using Warranties Effectively
A well-structured warranty should:
Clearly define coverage limits and exclusions.
Align with the owner's expectations for protection.
Complement—rather than replace—proper installation and high-quality design.
For manufacturers, warranties serve as a business agreement that limits liability while engaging with project teams to achieve better outcomes. Similarly, from an owner’s perspective, a strong warranty establishes accountability among manufacturers and contractors.
Choosing the Right Waterproofing Warranty
Before committing to a warranty, consider:
The level of protection needed (basic material coverage vs. full labor & repair costs).
Manufacturer involvement (some warranties require periodic inspections).
Potential exclusions (check what voids the warranty before signing).
Ultimately, a waterproofing warranty should serve as a safeguard—not a substitute for proper installation and sound construction practices. Selecting the right warranty ensures peace of mind and long-term protection for your investment.
