PermaRock SiliconeUltra
K Finish (Textured Render)

PermaRock SiliconeUltra K Finish represent the state-of-the-art in external through-colour renders. 


Based on a hybrid binder system of organically crosslinked nano-quartz particles and silicone emulsion, SiliconeUltra K Finish offer a class-leading, self-cleansing effect, with enhanced resistance to dirt pick-up, providing cleaner surfaces for longer than conventional silicone, acrylic or mineral renders.

Lightweight, water repellent, with excellent water vapour permeability, they can also resist aggressive air pollutants. Photo-catalytic particles help actively break down dirt particles which can be washed from the surface under normal weathering, and they contain a preservative against coating deterioration due to algae and fungus.

PermaRock SiliconeUltra K Finish (1.5mm) is assessed to EN 13501-1 and when used as the decorative finish of a PermaRock Mineral Fibre External Wall Insulation system, the system achieves an A2-s1,d0 classification and is suitable for use on buildings of any building height, including those with a storey height above 11 metres.

Available in an extensive range of colours from the PermaRock Colour Chart, PermaRock SiliconeUltra K Finish is available with a K (stippled) texture, in 1.5, 2.0 and 3.0 mm grain sizes. Darker colours (Lightness Factor <20) are unsuitable for use with EPS systems. 

Where utilised on Mineral Fibre insulation systems or PermaRock / PermaRend render systems, these darker shades may also require an additional coat of PermaRock SiliconeUltra Façade Coating.

PermaRock Façade A1 Colour Range

Our Façade A1 colour range provides 500 colour shades with the highest colour brilliance and more permanent colour stability. Formulated entirely with inorganic pigments, the colour range is designed to complement PermaRock’s SiliconeUltra through-coloured renders which employ unique binder combinations. 

Learn about the key benefits of the A1 range 

Method of Application

Supplied pre-tinted to the required colour, PermaRock SiliconeUltra K Finish is ready to use and are applied onto the prepared surface by stainless steel trowel or using spray equipment. The applied finish is then rubbed-up and textured with a plastic float to the grain size.

Application / Drying Conditions

Temperature (material, substrate and ambient) during application and drying : +5 ºC to + 30 ºC. Application should not take place in direct sunlight, during strong wind, fog, high relative humidity or when imminent rain or frost is expected. The material dries by water evaporation and film formation.

Drying time: at 20 ºC and 65% RR: Surface dry after approx. 24 hours. Cured, recoatable and ready for stress after 2 - 3 days.


PermaRock K & R Primer is supplied, pre-tinted to the required colour, in 25 kg plastic pails.

PermaRock SiliconeUltra K Finish is supplied pre-tinted to the chosen colour in 20 kg plastic pails.

Available Colour / Texture / Grain Size