If you’re in the business of building concrete structures, chances are you’ll need to use a render accelerator at some point, especially if you’re working in colder climates. But what exactly is this additive, and why are so many contractors turning to it? For more information, see this article.

Render Accelerator

With the various benefits that it provides to newly built houses, the act of rendering has become increasingly popular among today’s homeowners. Aside from improving a building’s overall aesthetics, rendering also offers durability and insulation for your walls. To render your walls, you’ll need the appropriate tools and your render mix. In some cases, you may also need a render accelerator.

A render accelerator is a type of liquid additive that, as its name suggests, accelerates the rendering process. Render accelerators are typically added to the render mix itself. The amount that you should add would depend on the manufacturer’s recommendations for optimal mixing.

Why You Should Use Render Accelerator

1.  Reduces waiting time

House rendering can take some time to cure, depending on the type of render you’re working with. Lime render, traditionally used in older properties, can take between two weeks and four weeks to dry. Traditional cement render requires a longer waiting time and can take up to a month to cure. Meanwhile, some renders come with a faster drying time, such as acrylic and silicone. With the former, you can expect the render to cure in around a couple of days. And when it comes to silicone render, it usually takes around a day to set.

While some renders can set relatively quickly, factors such as weather conditions affect how fast the render would dry. This is why rendering in poor weather is not usually recommended. But by applying a render accelerator to your walls, you can speed up the drying process and ensure that you’re on track with your target timeline for your construction project.     

2. Allows for faster job completion

Applying a render accelerator enables you to speed up the curing process. Consequently, this allows you to complete your construction project at a much faster rate than if you have not used a render accelerator.

Aside from hastening the curing rate, render accelerators allow the render to be scraped at an earlier time. Scraping is typically needed when you’re dealing with scraped textured finishes. It involves using a scraping float to take away approximately up to 2mm of aggregate from the entire render surface. Light, circular motions are applied to give the finish an even look. The timing of when to accomplish the scraping is crucial. It should be done after the render has been set but not completely hardened. Typically, scraping can be done the day after application. With a render accelerator, this process can be expedited, and scraping time can be done the same day you’ve applied your last coat.

3. Easy to use

Render accelerators are typically easy to use and come in ready-to-mix packages. Using the accelerator involves pouring the additive directly into the render and mixing thoroughly. Depending on the manufacturer’s instructions, you can use a plaster mixer, a water butt, hand mixing or a render pump for mixing the accelerator. You must mix the accelerator thoroughly into your render mortar to ensure optimal consistency that’s easy to apply on external walls.

Check the manufacturer’s instructions for the best times to use the accelerator and if there are any working condition restrictions that you should keep in mind. You should also check the precise amount of render accelerator to use. Additionally, take note of the accelerator’s compatibility with different types of render. Some products are compatible only with silicone and acrylic types. Meanwhile, concrete accelerators also referred to as cement accelerators, are suitable if you’re working with cement render. An example of this is the Sika accelerator, which gives renders improved frost resistance and strength.

4. Does not affect render appearance and performance

Render accelerators are often designed with the render finish in mind, ensuring that the former does not affect the latter in terms of appearance and performance. You can safely apply an accelerator without worrying that it will modify the look of your finished render. Aside from preserving the aesthetics of your render, it also won’t affect the render’s performance. This means that your render should work as intended, giving your external walls an added layer of protection.    

As accelerators help renders to have faster drying times, you won’t have to deal with issues associated with slow curing rates. One of these issues is the presence of cracks in your external walls. Cracked render can mar the appearance of your property. Aside from this, it can allow moisture to penetrate your walls. Another issue that comes with slow drying times is lime bloom. Lime bloom appears as a white discolouration in your walls, which also affects the aesthetics of your home. Using render accelerators can prevent lime blooms from occurring on your property by ensuring faster water evaporation.   

5. Handy for cold weather conditions

You can use render accelerators all year round, but it’s especially handy for cold weather building projects due to its ability to speed up curing times. Working in cold weather has its challenges. Because of low temperatures, the integrity of materials used in construction can be severely affected. Waterproofing jobs, concrete pouring and curing are just some of the tasks affected.

In winter, you can expect increased water retention and decrease drying rates. Accelerators help you combat these issues, ensuring that you can continue to work even in colder weather. Accelerators can typically be applied even in temperatures of 5 degrees Celsius. This helps renders to set and produce durable topcoats. In contrast, not using accelerators can leave top coats susceptible to low temperatures, causing them to not set properly.  

Ensure optimal workability for your renders, even in harsh weather conditions. Leverage render accelerators to speed up drying times and complete your construction project on time.

Contact Amaroc to discover the best accelerators to use for your next home project. Browse our K Rend Accelerator and Ecorend Accelerator today.
February 08, 2022