Modern waterproof render systems are designed to cope with the changing weather conditions we regularly experience in the UK, but correct application is still essential. Even high-performance silicone render systems and monocouche renders can suffer from issues if they are applied during heavy rain, freezing temperatures or excessive heat.
Most waterproof render systems need stable drying conditions to cure correctly. If fresh render is exposed to rain too early, it can lead to streaking, patchiness or weakened surface strength. On hot days, rapid drying can increase the risk of cracking and inconsistent texture.
When carrying out silicone rendering for external walls, it’s important to follow manufacturer guidance carefully and protect freshly rendered elevations where needed.
Know your conditions
It goes without saying that before you begin the application process of any render, you should read and fully understand the application instructions supplied by the manufacturer.
The type of render system being applied is another factor to consider. Dry dash systems are more resilient to wet and cold weather than their silicone counterparts.
It is also advisable to check the weather forecast for your planned application dates – try to avoid any days with excessive rain, wind, heat or cold. Extreme weather conditions can severely affect the both the application and drying / curing times of the render.
Simple Solutions
In hot weather, do not apply render on walls which are exposed to direct sunlight. Instead, start on an adjacent wall in the shade and follow the sun around the building. This method allows you to work in sunny weather, whilst avoiding any curing issues direct sunshine may cause.
Certain weather conditions will slow the curing process down – usually due to colder temperatures (less than 5oC) or high humidity (90% and higher). If this is the case, then the render will retain moisture for a longer period of time and if sustained will become more susceptible to damage from trapped moisture so it is essential that the render system is protected during this stage.
Ask an expert
At Rendit, we offer a 2-year crack free guarantee on our Render Systems, so if you need any help applying your render contact Rendit today!