The most critical factor in protecting car park decks, whether for new or existing structures, is the deck waterproofing system. Water-borne chlorides, such as de-icing salts, can severely damage reinforced concrete, making comprehensive waterproofing essential. When parking decks are inadequately protected or left as bare concrete, the impact on the structure can be significant.

Over the years, a variety of deck waterproofing systems have been developed including, asphalt, epoxy resin, polyurethane and more recently PMMA (Poly-Methyl-Methacrylate) and MMA (Methyl-Methacrylate). These advance systems offer superior durability and are preferred for their rapid-curing capabilities, which significantly reduce application times and minimise disruption to car park occupants.

At Cemplas, we collaborate with lead manufacturers of car park waterproofing systems including, Sika, Tremco and Westwood. All the systems we use are compliant with BS-EN 1504 Part 2 standards. However, specifying the correct waterproofing requires careful consideration of technical factors, as every structure has unique needs.

Top and exposed decks are among the most vulnerable areas, requiring robust protection against UV exposure, water ingress, freeze/thaw cycles and chloride penetration. These areas also need crack-bridging capabilities to accommodate structural movement across a range of temperatures, as outlined in design codes.

Intermediate decks, while not exposed to weather, still require protection from de-icing salts, abrasion and impact. Additionally, these decks can benefit from enhanced aesthetics, as the waterproofing systems come in a variety of colours that can brighten dark environments. Ramps and turning circles, subject to heavy mechanical impact and abrasion, demand heavy-duty protection to ensure maximum wear resistance and durability.