Atlas Silicone Render White 25 kg — Self-Cleaning Thin-Coat Finish (1.5 mm / 2.0 mm)

Product Overview

Atlas Silicone Render is a ready-mixed, fibre-reinforced silicone finish coat supplied in a 25 kg bucket, delivering up to 11.4 m² of coverage per tub at 1.5 mm grain — one of the highest yields in the premium silicone render range. Formulated with a blend of silicone and siloxane resins, dolomite aggregates, and cellulose-fibre reinforcement, this white base variant provides a self-cleaning, hydrophobic facade that actively sheds rainfall-borne dirt so the finish stays visibly clean year after year. The product is classified A2-s1, d0 for reaction to fire under EN 15824:2017 (DoP 145/3/CPR, verified March 2026), meaning it does not contribute to fire spread and produces negligible smoke on a facade — a reassuring safety credential for residential and commercial projects alike.

Available in two aggregate sizes — 1.5 mm (N-15) for a finer finish with superior coverage, and 2.0 mm (N-20) for a heavier texture that masks minor basecoat imperfections — this atlas white silicone render also comes in a selection of lighter, less intensive SAH shades that you can choose directly on this page, alongside the pure white base for the brightest contemporary facades. Each tinted option is factory-mixed to your chosen SAH code, ensuring consistent colour across every bucket — and for darker or more intensive shades, the grey-base variant is recommended (see the comparison in the selection guide below). UV-stable hybrid pigments, validated through Xenotest accelerated weathering trials, ensure the bright finish resists yellowing and fading over the long term, while white's high solar reflectance reduces thermal stress on the coating for extended service life across every UK climate zone.

Key Benefits

• Self-Cleaning Facade That Stays Bright: The high silicone and siloxane resin content lowers surface tension so that rainfall actively lifts dirt, dust, and urban pollutants from the finish — your white or light-tinted facade maintains its clean appearance without manual washing or repainting, cutting long-term maintenance costs significantly compared with standard acrylic alternatives.
• Crack-Free Flexibility Through Seasonal Movement: Cellulose-fibre reinforcement combined with dedicated polymer resins allows the coating to flex with thermal expansion and contraction instead of cracking (the elastomeric matrix absorbs building movement and minor site impacts up to 140 J in certified system assemblies, keeping the surface intact through UK temperature swings).
• Year-Round Application Down to 0 °C: A standard working range of +5 °C to +30 °C extends to 0 °C with the addition of Atlas Eskimo setting accelerator, so your project schedule is not locked to the warmer months — winter rendering becomes practical and reliable.
• Breathable Moisture Management for Healthier Walls: A vapour permeability rating of V2 — high (Sd 0.14–1.4 m) allows trapped moisture to escape outward through the render rather than building up inside the wall layers, protecting the building fabric from interstitial condensation and reducing the risk of internal mould.
• 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 on the surface — so your facade stays clean even near trees, ponds, or shaded elevations where biological growth would otherwise appear.
• Up to 11.4 m² per 25 kg Bucket: At 1.5 mm grain applied by hand, consumption starts from just 2.2 kg/m², meaning each tub covers a generous area and reduces the number of buckets you need on site — machine application lowers this further to 1.9 kg/m² (approximately 13.2 m² per bucket), cutting material handling time on larger projects.

Technical Specifications

Property	Value
Pack Size	25 kg plastic bucket
Colour	White base — tintable to 480 SAH shades; popular lighter 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

Atlas Silicone Render works as the finishing coat within a complete external wall insulation or prepared mineral-render system, delivering 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 — giving you one product that covers new-build and retrofit projects alike.

• Mandatory Primer Coat: A quartz primer controls suction and ensures a uniform 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 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 the best 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 lighter SAH shades — including soft creams, warm off-whites, and pastel tones — or order the pure white base for the brightest possible facade. For darker and more intensive colours, the grey-base variant delivers richer pigment saturation. To confirm your chosen 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 finish with a textured plinth treatment from the mosaic render collection to add durable protection below DPC.

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 texture across the entire facade plane. Choose a dry day between +5 °C and +30 °C with relative humidity below 80 % — these conditions let the silicone resins cross-link properly, locking in the self-cleaning surface and full colour depth within 24 hours. For temperatures between 0 °C and +5 °C, adding Atlas Eskimo setting accelerator (0.25 kg per bucket) accelerates initial set and protects the fresh render during the longer cold-weather drying window — the full seasonal protocol is covered in the cold-weather rendering guide. 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 colour variation.

Trade Insight: Installer's Note

White shows everything — the high reflectance of a bright white finish amplifies even minor surface ripples that a darker shade would absorb, so a well-levelled basecoat is essential. I always run a straight edge across the cured basecoat before priming to catch any high spots, because on white that five-minute fix at basecoat stage makes the difference between a flawless facade and one that catches the eye in afternoon raking light. 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 professional method, from basecoat preparation through to final texturing, is detailed in the thin-coat render application step-by-step guide.

Is This Product Right for Your Project?

• Ideal if: You want a bright, low-maintenance white or light-toned facade for a modern house, extension, or insulated building — the self-cleaning silicone surface keeps the finish looking fresh without repainting, the high solar reflectance of white minimises thermal stress on the coating, and the 1.5 mm grain size delivers one of the highest coverage rates in the range at up to 11.4 m² per bucket. Select your preferred lighter SAH shade directly on this page, or order in pure white for the cleanest contemporary finish.
• Need a grey base for darker colours? The grey-base 25 kg silicone finish in the same Atlas range uses an identical silicone-siloxane formula with a grey pigment base — it is the better starting point for mid-tone and dark tinted shades, reducing the number of coats needed to achieve full colour depth on contemporary facades.
• 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 is usually the better fit for historic substrates that require maximum vapour permeability and mineral compatibility.

Frequently Asked Questions

How much Atlas Silicone Render do I need per 100 m²?

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 (25 kg each). 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 when should I choose the grey base instead?

For the lightest shades — pure whites, soft creams, warm off-whites, and delicate pastels — the white base gives you the cleanest, most vibrant result because the white pigment enhances brightness rather than dulling it. Use the colour selector on this page to pick from these popular lighter SAH tints, each factory-mixed to your chosen code for consistent colour across every bucket. The standard system with Atlas Hoter U2 reinforced basecoat supports colours with a light reflectance value (HBW) above 15 %, and with Atlas Stopter K-100 dispersion adhesive compound the range extends down to HBW 6 % — covering the vast majority of the 480-shade SAH palette. For darker and more intensive colours — anything from mid-tone sandstone through to charcoal — the grey-base variant delivers richer pigment depth with fewer coats, so switch to that product if your project calls for a deeper finish. To explore the full palette before you order, browse the colour charts and sample catalogues range.

Can I apply Atlas Silicone 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.

Will the white finish yellow or discolour over time?

The white pigment is integrated throughout the full depth of the render using a hybrid inorganic-organic pigment system validated by rigorous Xenotest weathering trials for long-term UV resistance — so the finish resists yellowing and fading far better than a surface-applied paint film. The self-cleaning silicone surface also prevents airborne dirt from embedding into the texture, keeping the white visibly bright between natural rain washes for the full service life of the facade.

Is Atlas Silicone Render environmentally responsible?

The render is a water-based formulation containing no solvents, and its environmental performance has been independently verified through a Type III Environmental Product Declaration (EPD) — a third-party assessment of the product's lifecycle impact 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.