Silicone renders

Silicone render refers to the final finish of render, not the base coats.

Silicone render finishes are often confused with other products such as K rend FT. These complete different products are pigmented cement renders which sometimes contain a colourless silicone water repellent, hence they are sometimes referred to as silicone render. The new generation of silicone renders are made up of an emulsion of synthetic silicones and polymers. They have high PH content making them a little resistant to algae and lichen growth. But as we have said before in this site take any claims of self-cleaning with a “pinch of salt” They do get dirty especially if trees are nearby. They exhibit excellent flexibility properties making them the No one choice for anti-crack renders. They are suitable for application over existing renders or over a new render and also as a final finish for external wall insulation systems.

The ultra-violet resistant pigments of a silicone or acrylic render allow for large areas to be rendered with perfect colour consistency.

What are the benefits of using silicone render rather than acrylic?

Both have excellent water repellency properties and are UV stable, but silicone has the edge.

The main benefits of a silicone finish V acrylic are better dirt repellence, Some degree of vapour permeability. Silicone renders are also able to accommodate pronounced movement in the underlying material, making them the best choice for external wall insulation systems

Silicone renders have a longer lifespan. When used over a quality render you should expect a 20 year + lifespan. Once they do get soiled and tired they can be freshened up by painting with a silicone smooth paint which can be roller applied. A good render base for the silicone would be a polymer render, reinforced with nylon mesh. The main benefits of either finish over a through coloured render are:

The profiles of corner-angle beads do not show through the render. It is not a good detail to have a white corner plastic bead poking through a self-coloured render. Although you can get colour matched angle beads they are still prominent and they can fade and change colour differently to the render over time. Silicone render systems completely encapsulate corner beads so you get a solid, neater finish. Another big advantage of silicone or acrylic renders is the colour range. They can be made up in just about any RAL or BS colour and are available in various textures from very fine to course. They are less prone to cracking especially when applied over a good quality render that is mesh reinforced. As mentioned above they are more resistant to dirt and grime, offering a bright modern finish. At the current time, a popular colour for a silicone render is grey. These products originated mainly in European countries, there are now many firms making these products in the UK, including WBS, Jubosil, Sto, Parex, Weber, K Rend, & Baumit to name a few. These products come ready mixed in the tub so to speak, they are best applied by a specialist firm they can be spray or trowel applied.