Most conversations about concrete waterproofing focus on topical membrane systems — products that are applied on top of the concrete surface to create a barrier layer. These systems have their place. But there is a different category of concrete protection that is less understood, more versatile, faster to apply, and in many situations the better specification: penetrating internal waterproofing.
DualGuard by Protocol Environmental Solutions (Coquitlam, BC) is the system we use. It's the same system specified on the Canada Line, the EverGreen Line, Canada Place, Pacific Centre, Easy Park, SFU Surrey Campus, Vancouver Public Library, and City of Surrey infrastructure. Here is how it works and where it belongs on your project.
What DualGuard Actually Does
DualGuard is not a coating. It does not sit on top of the concrete. When applied to a prepared concrete surface, it penetrates 1–3mm into the concrete matrix and reacts chemically with the calcium silicate in the concrete to form a hydrophobic membrane within the pore structure of the concrete itself. The result is permanent internal waterproofing — protection from the inside out.
Because the waterproofing is internal, it cannot peel, delaminate, chip, or wear off. There is no topical film to be damaged by vehicle tires, foot traffic, UV exposure, or freeze-thaw cycles. The concrete is permanently changed at a molecular level.
It Works on Every Concrete Surface — Not Just Floors
This is the point that gets missed most often. DualGuard is not a flooring product. It can be applied to any bare, untreated concrete surface — horizontal or vertical, above or below grade, interior or exterior.
Parkade deck surfaces. Columns and walls. Highway retaining walls. Transit station concrete. Building exteriors. Underground structures. Driveways. Anywhere there is bare concrete that is exposed to moisture, chlorides, freeze-thaw cycles, or efflorescence — DualGuard can be applied.
The Canada Line application is a good illustration: concrete columns, walls, stairwells, above-ground rail structures, and below-ground station surfaces were all treated. The goal was to stop moisture infiltration and efflorescence across every exposed concrete surface in the system — horizontal, vertical, and everything in between.
The Two-Step Process: WashAway Xtreme + DualGuard
For DualGuard to penetrate effectively, the concrete surface must be open — free of oil, sealers, paint, efflorescence, and anything else blocking the pores. This is where WashAway Xtreme comes in.
WashAway Xtreme is the surface preparation step. Applied first, it cleans the concrete, removes oil and stains, dissolves efflorescence deposits, and profiles the surface to the CSP required for DualGuard penetration. Once the surface is clean and open, DualGuard is applied by low-pressure sprayer with liberal coverage. The product penetrates into the concrete and is absorbed over 1–2 hours. The surface is then back in service.
DualGuard for Parkades: A Budget-Conscious Waterproofing Option
On occupied parkade structures where a full traffic deck membrane installation is not feasible — budget constraints, strata timeline limitations, partial restoration scope — DualGuard provides a practical alternative for protecting bare concrete areas, columns, and walls that are not subject to direct heavy vehicle traffic.
It stops chloride penetration into exposed concrete surfaces. It reduces moisture movement through the slab and walls. It stops efflorescence. And it can be applied section by section with no significant disruption to parkade operations. For strata corporations managing ongoing maintenance on an older parkade, this is often the most practical and cost-effective concrete protection tool available.
Important Limitation to Know
DualGuard is not suitable as a base for coatings, paints, or sealants applied immediately after treatment. Because it creates a semi-sacrificial surface repellent layer, adhesion of subsequent topical products can be compromised. If the surface will later be coated — for example, if you intend to apply an epoxy floor coating on the same slab — VersaGuard (the companion product in the same system) should be specified instead of DualGuard. VersaGuard provides the same internal waterproofing without the surface repellent layer, making it the correct specification when a topcoat will follow.
Where DualGuard Belongs on Your Project
- Parkade columns, walls, and bare slab surfaces where a full traffic membrane is not in scope
- Retaining walls and exterior concrete on commercial and institutional buildings
- Transit and municipal infrastructure — stations, rail structures, bridges
- University and campus buildings — interior and exterior concrete maintenance
- New construction slabs for moisture mitigation before other trades install flooring
- Driveways and exposed plazas on commercial and institutional properties
If you have bare concrete that is exposed to moisture and you want permanent, low-disruption protection — DualGuard is worth understanding. Contact us for a project discussion.