Most waterproofing fails at a joint. Spray-applied polyurea does not have any — it goes down as one continuous membrane, bonded to the surface, and it is walkable within minutes rather than days.
Polyurea at a glance
- Cure time
- Trafficable within minutes of spraying
- Coverage
- Up to 5,000 sq ft per day
- Joints
- None — a single seamless membrane, including up walls and over upstands
- Movement
- Flexible, so it moves with the structure instead of cracking away from it
- Typical uses
- Parkades, podium and plaza decks, balconies, bridge decks, tanks, ponds, secondary containment
- Service life
- [Phil: what do you tell clients to expect, and under what conditions?]
Why the cure time actually matters
On paper, "cures in minutes" sounds like a technical detail. In practice it is usually the reason a job is possible at all.
- A strata walkway or parkade can be sprayed and handed back the same day, so residents are not displaced and you are not funding alternative parking for a week.
- A rail or road structure can be done inside a fixed possession or closure window, because the surface does not need to sit untouched overnight.
- An island or remote job can be prepared, sprayed and finished in a single mobilisation instead of two.
- Rain is far less of a threat. A conventional coating that gets wet mid-cure is usually a write-off; polyurea is past that window in minutes.
Not sure whether polyurea is right for your structure? Tell us what you have and what the constraints are — we will tell you honestly.
Seamless is the point
Sheet membranes and liquid coatings applied by brush or roller both rely on overlaps. Every lap, every termination and every penetration is a place where water can eventually find a way through, and on a deck those are exactly the places that move and wear.
Polyurea is sprayed as one continuous film. It carries up upstands, around drains and over penetrations without a break, so there is no lap to fail. That is why it suits containment work — tanks, ponds, secondary containment — where a single pinhole is the whole problem.
Where we use it
Parkades and podium decks
Traffic-grade finish with a broadcast anti-slip surface, over occupied space.
Balconies and walkways
Fast turnaround on the access routes residents cannot do without.
Bridge and transport decks
Work that has to finish inside a fixed closure window.
Tanks and containment
Seamless lining where a single defect would defeat the whole structure.
Ponds and water features
Liners that flex with the concrete instead of cracking away from it.
Residential decks
A hard-wearing, sealed surface that is walkable the same day.
How a polyurea job actually runs
- We look at it first. Substrate condition, moisture, falls and drainage all decide whether polyurea is the right answer — sometimes it is not, and we will say so.
- Preparation. Shot blasting or grinding to a sound, profiled surface. This is the step that determines whether the membrane bonds, and it is the step most often skimped.
- Repair and detailing. Spalled concrete made good, falls corrected to the drains, and every perimeter, upstand and penetration detailed before the main spray.
- Primer. Matched to the substrate so the membrane is chemically bonded, not just lying on top.
- Spray application. The membrane goes down in one continuous pass at the specified thickness.
- Finish. Anti-slip aggregate broadcast and sealed with a UV-stable topcoat where the surface will see daylight or foot traffic.
When we would not recommend it
Polyurea is not the answer to everything, and quoting it where it does not belong is how people end up disappointed. If the substrate is unsound, if there is active water pressure that has not been dealt with first, or if the real problem is drainage rather than the coating, then a membrane of any kind is treating the symptom. We would rather tell you that at the quoting stage than after the work.
Polyurea on real projects
- CN rail bridge deck resurfacing — done inside the possession window
- Mayne Island deck — sprayed and finished in a single visit
- Strata walkway — residents walking on it the same day
- Pond and river water feature — seamless liner
We have been spraying polyurea across British Columbia for over 15 years. If you have a deck, a parkade, a tank or a structure that needs to hold water, tell us about it.