Grey Atlas Silicone Render — Self-Cleaning Facade Finish 25 kg (1.5 mm / 2.0 mm)

Product Overview

Grey Atlas Silicone Render is a ready-mixed, fibre-reinforced silicone finish coat in a 25 kg bucket that covers up to 11.4 m² at 1.5 mm grain, giving you a self-cleaning facade in a contemporary grey or any of the darker, more intensive SAH colours available to select on this page — no separate masonry paint required. Part of the premium silicone render range, this grey-base variant is formulated with a blend of silicone and siloxane resins, dolomite aggregates, and cellulose-fibre reinforcement that together produce a hydrophobic, flexible coating rated A2-s1, d0 for reaction to fire under EN 15824:2017 (DoP 145/3/CPR, verified March 2026). The grey pigment base serves as the ideal starting point for mid-tone and dark tinted shades across the 480-colour SAH system, meaning fewer coats are needed to reach full colour depth compared with a white base — so your facade achieves a richer, more uniform tone with less material.

Available in two aggregate sizes — 1.5 mm (N-15) for a fine lambskin texture and peak coverage, and 2.0 mm (N-20) for a heavier texture that forgives minor basecoat imperfections — this render also comes in a range of darker, more intensive SAH shades selectable on this page, alongside the Platinum grey base for a clean neutral finish. Each tinted option is factory-mixed to your chosen SAH code, ensuring consistent colour across every bucket. UV-stable hybrid pigments, validated through Xenotest accelerated weathering trials, keep your chosen shade true on even the most exposed south-facing elevations. The high silicone-resin content also lowers surface tension enough for each rainfall to actively lift embedded dust and urban pollutants from the finish — so the facade cleans itself year after year.

Key Benefits & Technical Advantages

• Self-Cleaning Surface That Stays Clean for Decades: The high silicone and siloxane resin content lowers surface tension so that every rainfall event actively washes dirt, dust, and airborne pollutants from the finish — your grey or tinted facade maintains its clean, contemporary appearance without manual washing or repainting, significantly reducing long-term maintenance costs.
• Crack-Free Flexibility Through Seasonal Movement: Cellulose-fibre reinforcement combined with dedicated polymer resins allows the coating to flex with thermal expansion and contraction rather than cracking (the elastomeric matrix absorbs building movement and minor impacts up to 140 J in certified system assemblies, keeping the surface intact through UK temperature swings from frost to summer heat).
• Year-Round Application Down to 0 °C: A standard working range of +5 °C to +30 °C extends to 0 °C when you add Atlas Eskimo setting accelerator, so your project schedule is no longer locked to the warmer months — winter rendering becomes practical and predictable.
• Breathable Moisture Management for Healthier Walls: A vapour permeability classification of V2 — high (Sd 0.14–1.4 m) under EN 15824 allows trapped moisture to escape outward through the render rather than building up inside the wall, protecting the building fabric from interstitial condensation and reducing the risk of internal damp.
• Built-In Algae and Mould Resistance: Low water absorption (In2 — average) combined with an alkaline pH 8 surface chemistry means algae and mould struggle to establish — your facade stays clean even near trees, ponds, or shaded urban elevations where biological growth would otherwise appear.
• Up to 11.4 m² per 25 kg Bucket at 1.5 mm Grain: Hand-applied consumption starts from just 2.2 kg/m², meaning each tub covers a generous area and reduces the number of buckets you need to move on site — machine application lowers this further to approximately 1.9 kg/m² (around 13.2 m² per bucket), cutting both material cost and handling time on larger projects.

Technical Specifications

Property	Value
Pack Size	25 kg plastic bucket
Colour	Grey base (Platinum) — tintable to 480 SAH shades; popular darker colours selectable on this page
Grain Size Options	1.5 mm (N-15) / 2.0 mm (N-20)
Density	≈ 1.9 g/cm³
Consumption — 1.5 mm Hand	From 2.2 kg/m² (≈ 11.4 m² per bucket)
Consumption — 1.5 mm Machine	From 1.9 kg/m² (≈ 13.2 m² per bucket)
Consumption — 2.0 mm Hand	From 2.8 kg/m² (≈ 8.9 m² per bucket)
Adhesion to Substrate	≥ 0.35 MPa
Water Vapour Permeability	V2 — high (Sd 0.14–1.4 m)
Water Absorption	In2 — average
Reaction to Fire	A2-s1, d0 (EN 13501-1)
pH	8
Application Temperature	+5 °C to +30 °C (0 °C with Atlas Eskimo)
Relative Humidity at Application	< 80 %
Surface Dry Time	≈ 15 minutes (at 20 °C, 60 % RH)
Full Cure Time	≈ 24 hours (at 20 °C, 60 % RH)
Shelf Life	12 months from date of manufacture
Standard Compliance	EN 15824:2017 (verified March 2026)
DoP Number	145/3/CPR
ETA References	ETA-06/0081, ETA-06/0173, ETA-16/0933

Application & Compatibility

Grey Atlas Silicone Render works as the finishing coat within a complete external wall insulation or prepared mineral-render system, giving you a durable self-cleaning surface over a properly cured reinforced basecoat. It is compatible with graphite EPS, XPS, and mineral wool insulation within certified ETICS assemblies, and it can also be applied over sound concrete and traditional cement or cement-lime plasters on renovation work — one product that covers both new-build and retrofit projects.

• Mandatory Primer Coat: A quartz primer controls suction and ensures a uniform colour finish — use Atlas Cerplast or Ceresit CT 16 from the exterior render primer range to prepare the basecoat surface before the render goes on.
• Reinforced Basecoat Layer: Embed alkali-resistant Atlas 150 g/m² fibreglass mesh into a fibre-enhanced adhesive mortar (Atlas Hoter U Grey or Hoter U White) to create the crack-resistant reinforcement plane beneath the finish.
• Grain Size Selection: Choose 1.5 mm (N-15) for the finest lambskin texture and peak coverage per bucket on a well-prepared, even basecoat; choose 2.0 mm (N-20) for a heavier texture that is more forgiving visually on larger or less uniform elevations.
• Colour Selection on This Page: Use the colour selector above to pick from the most popular darker and more intensive SAH shades — the grey base delivers richer, deeper colour saturation than the white base for mid-tone and dark tints, with each order factory-mixed to your chosen code. To confirm your shade before ordering, browse the colour charts and sample catalogues.
• Plinth and Impact Zones: For ground-level areas exposed to foot traffic, splashback, or minor impacts, pair this grey finish with a textured plinth treatment from the mosaic render collection to add durable protection below the DPC line.

Installation Notes

Faster, more consistent results start with correct preparation: allow the primed basecoat to cure for a minimum of three days at +20 °C before applying the render, ensuring the substrate is stable, dry, and free of dust. Stir the ready-mixed mass thoroughly with a low-speed paddle mixer — do not add water or any other material. Apply with a stainless-steel trowel at aggregate thickness, then texture immediately using a plastic float in a circular motion to achieve the lambskin effect.

For the cleanest result, always work wet-on-wet across a full elevation rather than allowing one section to dry before the next is applied — this eliminates visible lap marks and ensures a uniform tone across the entire facade plane. Choose a dry day between +5 °C and +30 °C with relative humidity below 80 %, and for temperatures between 0 °C and +5 °C, adding Atlas Eskimo setting accelerator protects the fresh render during the longer cold-weather drying window. Plan technological breaks at building corners, colour junctions, or downpipe lines, and apply render of the same manufacture date across one continuous surface to prevent batch-related shade variation — this is especially important with darker SAH tints where even minor differences in surface development become visible in raking light.

Trade Insight: Installer's Note

Grey base is the go-to choice whenever I am tinting to anything from a warm sand to a charcoal — starting on a grey pigment means the colour builds up faster and with more consistent depth than working from white, and that translates directly into fewer coats and less material on site. I always run a straight edge across the cured basecoat before priming to catch any high spots, because the 1.5 mm aggregate telegraphs every imperfection. For machine application, the 1.5 mm version runs cleanly through a Wagner PC 830 or Graco RTX 5500 PX with a 6 mm round nozzle at moderate feed settings; flushing the hose with a small quantity of Cerplast or Silkon ANX before pumping the render ensures a smooth, uninterrupted feed from the first pull of the trigger. The full method from basecoat preparation through to final texturing is detailed in the thin-coat render application step-by-step guide, and the seasonal timing guidance — including the Eskimo accelerator protocol — is covered in the cold-weather rendering guide.

Is This Product Right for Your Project?

• Ideal if: You want a contemporary grey facade or a rich mid-to-dark tinted finish for a residential or commercial project — the grey pigment base reaches full colour depth faster than a white base, the self-cleaning silicone surface keeps the finish looking sharp without repainting, and the 1.5 mm grain delivers up to 11.4 m² per bucket for efficient material use. Select your preferred SAH shade directly on this page to order the exact colour you need.
• Need a bright white base instead? The white-base 25 kg Atlas Silicone Render in the same range uses an identical silicone-siloxane formula with a white pigment base — it is the better starting point for the lightest shades and pure white facades, where its high solar reflectance also reduces thermal stress on the coating for an extended service life.
• Look elsewhere if: You are rendering an older heritage or lime-based wall that needs a more mineral, conservation-friendly specification — in that case, the silicone-silicate render provides the maximum vapour permeability and mineral compatibility that historic substrates require.

Frequently Asked Questions

How much grey Atlas Silicone Render do I need for my project?

At 1.5 mm grain applied by hand, consumption starts from 2.2 kg/m², so 100 m² requires a minimum of 220 kg — that is 9 buckets of 25 kg. Adding 5–10 % for site waste, corner detailing, and uneven substrates brings a practical order to 10–11 buckets. At 2.0 mm grain the consumption rises to 2.8 kg/m², requiring at least 12 buckets for the same area. Use the render coverage calculator to confirm the exact quantity for your project dimensions.

What system components do I need alongside this render?

A complete system includes a fibre-enhanced reinforced basecoat (Atlas Hoter U Grey or Hoter U White), alkali-resistant fibreglass mesh embedded into the basecoat, and a quartz primer applied over the cured basecoat before the finish coat goes on. The most commonly paired primers are Atlas Cerplast and Ceresit CT 16, both available in the render primer range. Ordering the full system together — basecoat, mesh, primer, and finish — ensures every layer bonds correctly, giving you the full manufacturer warranty and a facade that performs for 25+ years without delamination.

Which colours are available on this page and how do I choose?

The grey base is the recommended starting point for virtually any shade from warm sand to deep charcoal — use the colour selector on this page to pick from the most popular darker and more intensive SAH shades, each factory-mixed to your chosen code for consistent colour across every bucket. With the standard Atlas Hoter U2 reinforced basecoat, you can specify colours with a light reflectance value (HBW) above 15 % (which covers the vast majority of popular mid-tone and dark tints), and with the Atlas Stopter K-100 dispersion adhesive compound, the range extends down to HBW 6 % (the deepest near-black shades). To see the full 480-colour SAH palette — including colour-to-HBW mapping — before you order, browse the colour charts and sample catalogues range.

Can I apply this render in winter?

Standard application requires a minimum temperature of +5 °C, but adding Atlas Eskimo setting accelerator (0.25 kg per 25 kg bucket) extends the working range down to 0 °C. The accelerator speeds up initial set so the render is less vulnerable during the longer cold-weather drying window, making winter rendering practical and reliable. Checking a 48-hour weather forecast before you start ensures the fresh render has sufficient dry time to cure without interruption.

Is this the same formula as the white variant?

The grey and white variants share an identical silicone-siloxane resin matrix, cellulose-fibre reinforcement, and performance ratings — only the base pigment differs. The grey variant is designed to deliver deeper, richer colour saturation for mid-tone and dark tinted finishes, while the white variant is optimised for the lightest shades and pure white facades. Both are classified A2-s1, d0 for fire reaction and carry the same DoP (145/3/CPR) under EN 15824:2017.

Is this render environmentally responsible?

Grey Atlas Silicone Render is a water-based formulation containing no solvents, and its environmental performance is independently verified through a Type III Environmental Product Declaration (EPD) — a third-party lifecycle assessment that architects and developers can reference in BREEAM or sustainability submissions. The long service life and self-cleaning properties also reduce the need for maintenance chemicals and repainting over the building's lifetime, lowering the overall environmental footprint of your facade system.