Installing Render and EWI During the Winter Months

We typically consider the rendering season to be from the start of March to the end of November, but over the past few years, we are noticing more and more of our installers braving the British Winter and installing render systems right through the year.

Winter obviously tends to be cold, but we also get lots rain and sometimes even snow! All of these conditions can have a negative impact on your work and affect the products you are using. This is why it is crucial to select the appropriate products when installing during the colder Winter months.

Winter products at EWI Store

Here at EWI Store we sell a range of products to allow you to render / apply EWI during the Winter months – we look at some of these in a bit more detail below.

Winter Adhesive

Winter Adhesive is a great and versatile product –  it can be used as both a basecoat and an adhesive – similar to EWI-220. However, the advantage of Winter Adhesive (EWI-221) is that it can be used down to temperatures of zero degrees Celsius, where as the EWI-220 EPS Basecoat can only be used down to 5˚C.

The Winter Adhesive is ‘stickier’ to use and goes off that much quicker than the standard basecoats, making it a must for installing in the very cold.

EWI-221 Winter Adhesive is:

  • Waterproof
  • Frost-proof
  • High Grip
  • Contains microfibres for increased flexibility
  • Hydrophobic

Render Accelerator

Silicone render is one of our most popular products here at the EWI Store. This is because it offers incredible performance in terms of flexibility, breathability and durability. Silicone Render can be used from +5°C to 25°C, but in the Winter months it can take 2-3 days to cure.

EWI-020 Render Accelerator can be used to speed up the drying time of our Silicone Renders. It is a liquid additive that gets added to the bucket of render and helps prevent costly render wash-off.

When installing Silicone Renders, we always recommend checking the weather forecast to ensure the days following application are dry so the Silicone Render has a chance to cure properly before any adverse weather, but the render accelerator also helps form a protective skin on the render again helping to protect it.

Silicone render is:

  • Weatherproof
  • Resistant to algae and plant growth
  • Frost-proof
  • Hydrophobic
  • Vapor-permeable
  • Nano-enhanced
  • Self-cleaning

Mineral Render

If Silicone Render isn’t your cup of tea, don’t despair!

Mineral Render is also an excellent option in colder conditions. Our Silicone renders cure when the water evaporates out of them, which is why they struggle to go off in the winter as the cooler / humid conditions slow the rate of evaporation (although accelerator helps!).

Luckily, Mineral render cures using a chemical reaction (in the same way cement cures) and therefore dries regardless. Mineral Render can give you the same look and breathability that Silicone Render can offer, however you do have to paint it with Silicone Paint once the mineral render is installed. Please note that unlike the Silicone renders that come in ready-to-apply buckets, the mineral render needs to be mixed with water prior to application. Please follow the preperation instructions on the back of the bag before install.

Mineral Render is:

  • Waterproof (once sealed with Silicone Paint)
  • Frost-proof (once sealed with Silicone Paint)
  • Vapour-permeable
  • UV-resistant
  • High grip

Additional Advice

As amazing as these products are, you still need to be sensible when choosing what conditions to work in.

  • Always check the weather forecast, you should avoid rendering in rain, snow, and wet conditions and ideally ensure the weather the few days after the install is dry too.
  • Never try and apply Silicone Render if the temperature is less than 5°C.
  • Always try and protect the surfaces that are being rendered with scaffold sheeting.
  • Always ensure surfaces are protected against wash-off, so for example the floors should be covered with Correx etc as once the Silicone render cures it is almost impossible to remove!