The stadium construction market is currently experiencing an unusual split: while several high-profile new stadium projects are underway across the NFL, NBA, and MLS, the majority of capital spending in the sports venue sector is going into renovation of existing facilities. Aging infrastructure, shifting fan experience expectations, and the prohibitive cost of new construction are pushing teams and university athletic programs toward renovation as the primary strategic vehicle.
For waterproofing professionals and facility managers, this shift creates an important distinction: waterproofing a renovation project is fundamentally different from waterproofing new construction, and failing to recognize those differences leads to specification errors, budget overruns, and system failures.
The New Construction Advantage
In new stadium construction, the waterproofing professional works with a clean slate. Substrates are fresh concrete with known mix designs, adequate strength, and proper curing. Drainage systems are engineered for their intended loads. Expansion joint locations are designed into the structural system rather than retrofitted. Waterproofing can be integrated with the structural design from the beginning rather than adapted to existing conditions.
This allows for optimized system selection based on performance criteria rather than compatibility constraints. The membrane system, joint sealing approach, drainage design, and protective topping can all be specified together as an integrated system. Warranties are easier to validate because the entire system was installed new at the same time.
The Renovation Complexity
Renovation waterproofing is detective work as much as technical practice. The waterproofing professional must first understand what’s already there — which may not be well documented — and then design a system that is compatible with the existing substrate, structurally compatible with the existing building, drainage-compatible with existing drain locations and slopes, and performant enough to provide meaningful service life from the renovation investment.
Unknown substrate conditions: Existing concrete in a renovation project may have decades of deicing salt contamination, may have been repaired multiple times with incompatible materials, and may have areas of significant structural deterioration that are not visible until the existing membrane is removed. Renovation budgets must include contingency for substrate remediation that isn’t identifiable until demolition begins. We typically recommend 15–25% contingency on renovation waterproofing projects specifically to accommodate substrate uncertainty.
Compatibility with existing systems: Renovation projects often involve transitioning from one waterproofing system to another. The new membrane must terminate against existing conditions — whether that’s existing membrane in areas not being replaced, existing expansion joint systems being retained, or existing structural conditions. These transitions are often the most technically demanding details of the entire project.
Drainage slope challenges: Existing drainage systems were designed for original construction. After decades of structural settlement, patching, and overlay installations, positive drainage slope to drains may have been compromised. Renovation specifications should include topographic survey of drain slopes before system selection to determine whether slope correction is needed as part of the scope. Attempting to apply a new membrane system without addressing inadequate slope will replicate the same ponding problems that contributed to the existing system’s failure.
Our inspection and consulting services include detailed pre-design assessment for renovation projects, giving design teams and facility managers the information they need to scope renovation work accurately before construction documents are finalized.
Design Life Expectations in Renovation vs. New Construction
Renovation waterproofing systems typically carry shorter warranty terms than new construction systems, for good reason: the substrate they’re applied to is older and its future performance is less predictable. A polyurethane deck membrane system installed over a 40-year-old concrete substrate carries more uncertainty than the same system installed over new concrete — even if the substrate has been carefully prepared and its current condition is good.
This doesn’t mean renovation waterproofing is a short-term fix. Well-specified and properly installed renovation systems regularly achieve 15–20 year service lives. But the design life expectation should be adjusted, and inspection and maintenance programs should be calibrated accordingly — typically with more frequent inspection intervals than a new construction equivalent would require.
Phasing Renovation Work
Many stadium renovation waterproofing projects are phased across multiple years due to both budget constraints and the need to maintain venue operations. Phasing creates its own set of technical challenges: new system installation must terminate at appropriate boundaries, and those terminations must remain waterproof through one or more seasons before the adjacent phase is completed.
We develop detailed phasing plans for renovation projects that identify optimal phase break locations, specify temporary termination conditions at phase boundaries, and design the interface between phases to be fully integrated when the subsequent phase is installed. This phasing expertise is something we’ve developed through dozens of renovation projects at occupied venues.
Working with Historical Records (or the Lack of Them)
Renovation projects at older stadiums are often challenged by incomplete or unavailable historical records. Original construction drawings may be missing, previous repair records may be undocumented, and the waterproofing systems that were installed in previous renovations may have no documentation at all.
In these situations, pre-design investigation is essential. Our investigation protocol for renovation projects with limited historical data includes: membrane core sampling (to identify existing system composition and layer structure), infrared thermography scanning (to identify delaminated areas without removal), ground penetrating radar in selected areas (to identify reinforcement condition and void spaces), and concrete core testing (to evaluate substrate strength and chloride contamination levels).
This investigation data informs both the removal strategy and the replacement specification, reducing the risk of encountering unexpected conditions during construction. View our case studies for examples of renovation projects where thorough pre-design investigation was the key to project success, or contact our team to discuss how this approach would apply to your renovation project.
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