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Coating A Car Park With Ecodur

Among the first signs of aging for multi-story car parks are in the winter months when clingy snow and road salts get dragged into them and melt pools of contaminated water drip through cracks and gaps in the slabs. Gravity and chemistry do the rest for the cars below.

De-icing salts are responsible for billions of dollar’s worth of damage to cars and concrete structures alike, often causing brake failures and body corrosion that can quickly destroy an automobile’s value. In reinforced concrete structures, it can not only widen gaps between the slabs, but also attack the re-bar and completely threaten a structure’s integrity to the point of collapse.

In this case study, an aging two-story car park in Denver, Colorado, estimated to be over 20-years-old, was causing complaints from clients who parked under the only partially covered section, as dirty water was dripping onto cars below with the potential to cause serious cosmetic damage or worse if left uncleaned.

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Problem.
With gaps in the slabs, the water off the tires and car bodies had a ready route through the slabs and onto parked cars. Dripping down, it strikes as an incompressible liquid helping it penetrate any weakness in a car’s shell. Once into the metalwork, the acids and alkalis in the liquid can and do quickly attack steel that has little or no protection.

The problem was how to adequately seal the cracks while retaining a degree of elasticity to ride with the minute stresses of compression, contraction and expansion caused by the traffic itself and the extreme ranges of temperatures without losing adhesion and waterproof integrity.

The client also wanted a zero-VOC solution that was totally benign for environmental impact while still providing outstanding performance.

Solution.
Ecodur 201M was chosen. Its VOC-free, non-BPA formulation was first applied to car parks over 25 years ago. It has exceptional adhesion on concrete. Made from renewable castor oil and gypsum, its natural formulation ensures it makes absolutely no toxic contribution to the environment. It is Class A flame retardant and NSF/ANSI-61 certified for contact with human drinking water.

Typically, Ecodur is applied manually to 30 mils thickness, but it can also be sprayed and foamed. Even manually applied, it readily penetrates deep into cracks well before the chemical process has brought it to the stage of setting up which is about 40 minutes.

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Application Results.
As with any coating, ensuring the substrate is clean and dry is vital. In this case, it was the upper exposed deck which was being coated. It was thoroughly swept in dry conditions and any oily spots from automobile drips were given particular attention.

Battleship gray Ecodur was applied and the final section coated was allowed a full 24-hours for curing. Yellow parking lines were applied and the line marking formulation works especially well with Ecodur, ensuring their adhesion performance and freedom from tire marks and corrosive effects of road salts.