Commercial Waterproofing

When water shows up inside your building, ACS traces where it’s really getting in and seals it with the right system for that surface, not just the roof.

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Commercial Waterproofing That Starts With Finding the Real Leak Source

A leak inside a commercial building does not always mean the roof failed. Water finds the path of least resistance, and on most commercial properties that path runs through a plaza deck seam, a below-grade wall, a parking structure joint, or the sealant around a window long before it ever touches the roof membrane. ACS treats commercial waterproofing as its own trade, separate from roofing, because tracing where water is entering a building takes a different read than diagnosing a failed roof system. That distinction is what makes commercial roof waterproofing a specialized diagnosis, not a guess.

Every Surface Gets the Right System

ACS waterproofing covers plaza decks built over occupied space, below-grade areas and parking structures, exterior walls including the sealant around windows, and foundation walls, and each surface gets matched to its own system rather than a one-size-fits-all answer. Plaza decks over occupied space are waterproofed with Westcoat systems, below-grade areas and parking structures with Sika, and exterior walls with Elastomerics, Tremco, or BASF systems depending on the application.

Get a Clear Read on Where Your Building Is Leaking

Before ACS recommends a commercial waterproofing system, we walk the building and identify where water is entering, not just where it shows up inside. That assessment is the foundation for everything that follows.

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24+

Years in Northern California

185+

Active Clients

The Diagnostic Work Behind Every ACS Commercial Waterproofing Job

  • We Trace the Source Before We Recommend a System

    Most water intrusion calls start the same way: water is showing up inside, and the assumption is that the roof failed. ACS starts by ruling that in or out. Because commercial buildings have so many places water can enter, plaza decks, walls, below-grade areas, foundations, a real diagnosis means checking the whole envelope, not just what is directly overhead.

  • The Right Material for the Right Surface

    ACS does not sell a single waterproofing product as a cure-all. Plaza decks, below-grade areas, parking structures, and exterior walls each carry different exposure, different traffic, and different failure points, which is why they call for different systems.

  • Self-Performed, Not Subcontracted

    ACS self-performs waterproofing directly instead of subcontracting it out. When a project also touches commercial roofing or renovation work, the same team handles all of it, so you’re not passing the job between a roofer, a waterproofer, and a general contractor who each only see part of the building.

FAQs About Our Commercial Waterproofing

If water is showing up inside your building but the roof looks fine, the entry point is often somewhere else on the envelope, a plaza deck, a below-grade wall, or the seal around a window. Left unaddressed, that kind of moisture is also how dry rot repair becomes necessary, so ACS checks for it while tracing the original leak.

The system depends on the surface. Plaza decks over occupied space use Westcoat systems, below-grade areas and parking structures use Sika, and exterior walls use Elastomerics, Tremco, or BASF systems depending on the application and exposure.

Either. ACS self-performs commercial waterproofing directly, so if an issue comes up during a commercial roofing project or gets flagged during a scheduled roof maintenance visit, it’s handled under the same relationship instead of bringing in a separate vendor.

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Allied Construction offers commercial waterproofing services built around finding where your building is really leaking, then matching the right system to fix it.

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