The high-traffic nature of car park environments means that the design and specification of substrate, waterproofing and surface needs to be considered carefully. This will help ensure a positive and safe experience for drivers and pedestrians as well as minimise the potential for issues and reduce maintenance requirements.
The correct waterproofing is essential, not only for the areas exposed to the elements, but also lower decks on multi-storey car parks. This is because vehicles will bring rainwater and chlorides into the structure, and the increase in car washing services in car parks also increases the risk of corrosion if there is water ingress into the structure.
Liquid waterproofing systems have a number of benefits and are an ideal solution for many different applications. SOPREMA’s liquid waterproofing solution, for example, is a dual-component resin composed of polymethyl methacrylate (PMMA) that is cold applied and therefore flame-free. It is quick to apply with either a roller or sprayed on and rapidly cures after which the areas can be used immediately. Additionally, liquid waterproofing systems can provide a solution where traditional waterproofing membranes are difficult to install. They are also useful where a weight restriction limits the ability to use additional layers of asphalt or where there is limited access or space for equipment. However, there are a number of considerations to ensure a successful installation.
Correct preperation
A successful installation relies on thorough preparation, especially on refurbishment projects. The first step is a survey, which contractors and leading product manufacturers can conduct. This will provide an overview of the current status and confirm if a new surface can be applied over the existing one. The report from the survey will highlight any issues that should be rectified before the waterproofing can be applied.
Surface testing
For liquid waterproofing, as a fully bonded system, the surface quality and consistency have a significant effect on durability and quality of the finish. A series of pull-off bond tests should be conducted on the deck in accordance with manufacturers guidelines before installation to confirm that the minimum required bond strength can be achieved.
The consumption rate – the amount of liquid resin used per metre square – must also be consistent across the installation. This is influenced by the substrates characteristics and quality. . Therefore, it is advisable to perform tests on the surface to check consistency in terms of porosity or roughness.
Best practice installation
Proper insulation is crucial to ensure long-term performance and avoid future problems. Always consult the relevant technical datasheet, which outlines key parameters such as product working life at varying temperatures and guidance on avoiding the dew point.
While one of the benefits of liquid PMMA products is ease of application over a wide range of temperatures and humidity, it is essential to stay within the stated ranges as failure to do so can result in poor curing.
During hot summer weather, contractors can achieve the optimal conditions by carrying out the install during the early morning or later in the day when the temperatures are lower. Wet conditions will also impact adhesion so it may be necessary to plan around periods of rain. Building flexibility into work schedules can enable the application to be carried out at the best time without impacting the overall programme.
Post installation
The use of best practice approaches should also continue throughout the lifecycle of the building with the scheduling of regular inspections and maintenance. This will help identify issues before they escalate and become more costly to address. It is also important to note that warranties also often rely on maintenance schedules being maintained.
Find out more about our car park waterproofing systems visit Soprema Uk website.