Description
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 that gives your facade a bright, self-cleaning surface designed to stay clean for decades — supplied in a 25 kg bucket covering up to 11.4 m² at 1.5 mm grain, making it one of the highest-yield thin-coat renders in the premium silicone render collection. Formulated with a blend of silicone and siloxane resins, dolomite aggregates, and cellulose-fibre reinforcement, this white-base variant delivers a hydrophobic facade that actively sheds rainfall-borne dirt so the finish stays visibly clean without repainting. The product is classified A2-s1, d0 for reaction to fire under EN 15824:2017 (DoP 145/3/CPR, verified against the current 2017 edition), produces negligible smoke, and carries ETA references ETA-06/0081, ETA-06/0173, and ETA-16/0933 — providing the compliance documentation that Building Control officers and warranty providers typically look for when approving a facade system.
Available in two aggregate sizes — 1.5 mm (N-15) for a finer lambskin texture with the best coverage per bucket, and 2.0 mm (N-20) for a heavier texture that masks minor basecoat imperfections — this white-base render is tinted to your chosen shade at our Southampton warehouse on a dedicated Atlas tinting machine, ensuring consistent colour across every bucket in your order. The full 480-shade SAH palette is mixed on site, and bespoke colours outside the standard palette — including shades matched to RAL, NCS, or other manufacturers' references — are available to order, so your project is never limited to a fixed swatch book. For darker or more intensive colours, the grey-base Atlas Silicone Render delivers richer pigment saturation from the same silicone-siloxane formula.
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 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 rather than 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.
- Any Colour Mixed to Order at Our Warehouse: Every tub is tinted on a dedicated Atlas mixing machine at our Southampton warehouse — the full 480-shade SAH palette is available from stock, and bespoke colours matched to RAL, NCS, or other manufacturers' references are mixed to order, so your project gets exactly the shade you need without waiting for a remote factory run.
- 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 runs through the colder months without compromising cure quality or finish durability.
- Walls That Breathe Freely: 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 helping maintain a healthy indoor environment.
- 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.
Technical Specifications
| Property | Value |
|---|---|
| Pack Size | 25 kg plastic bucket |
| Colour | White base — tintable to 480 SAH shades (mixed to order in-house); bespoke colours available |
| 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 (current edition) |
| DoP Number | 145/3/CPR |
| ETA References | ETA-06/0081, ETA-06/0173, ETA-16/0933 |
Application and 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. The product is compatible with graphite EPS, XPS, and mineral wool insulation within certified ETICS assemblies, and it performs equally well 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 finish coat 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 best coverage 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 — Mixed to Your Specification: Every tub is tinted at our Southampton warehouse on a dedicated Atlas mixing machine. The full 480-shade SAH palette is available as standard, and bespoke colours — including shades matched to RAL, NCS, or another manufacturer's reference — are mixed to order for projects that need something outside the standard range. Browse the colour charts and sample catalogues to confirm your chosen shade on a physical chip before ordering, or contact our team with your reference code for a bespoke match.
- Plinth and Impact Zones: For ground-level areas exposed to 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 — the product must not be combined with other materials, diluted, or thickened. 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.
- Wet-on-Wet Technique: Work across a full elevation without allowing one section to skin over before the next is applied — this eliminates visible lap marks and ensures a uniform texture across the entire facade plane.
- Optimal Conditions: 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.
- Batch Consistency: Apply render of the same manufacture date across one continuous surface to prevent batch-related colour variation, and plan technological breaks at building corners, colour junctions, or downpipe lines.
For temperatures between 0 °C and +5 °C, adding Atlas Eskimo setting accelerator (0.25 kg per bucket) protects the fresh render during the longer cold-weather drying window — the full seasonal protocol is covered in the cold-weather rendering guide.
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 the single most important preparation step. 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?
- Choose This Render 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 up to 11.4 m² coverage per 25 kg bucket. Every tub is tinted to your chosen SAH shade at our warehouse, and bespoke colour matching is available for non-standard references.
- Need Richer Colour Depth for Darker Shades? The grey-base 25 kg Atlas Silicone Render in the same 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.
- Consider an Alternative 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. The render coverage calculator confirms the exact quantity for your project dimensions.
Which colours are available and when should I choose the grey base instead?
Every tub of Atlas Silicone Render is tinted at our Southampton warehouse on a dedicated Atlas mixing machine, so the full 480-shade SAH palette is available without a remote factory lead time. 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. The standard system with Atlas Hoter U2 reinforced basecoat supports colours with a Heat Brightness 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 SAH palette. For projects that need a shade outside the standard palette — a specific RAL, NCS, or another manufacturer's code — our team mixes bespoke colours to order on the same equipment, so your facade gets exactly the tone you need. For darker and more intensive colours, the grey-base variant delivers richer pigment depth with fewer coats; switch to that product if your project calls for a mid-tone or deep finish.
Can I apply Atlas Silicone Render in winter?
Standard application requires a minimum air and substrate temperature of +5 °C. Adding Atlas Eskimo setting accelerator (0.25 kg per 25 kg bucket) extends the working range down to 0 °C and speeds up initial set, so the render is less vulnerable during the longer cold-weather drying window. Checking a 48-hour weather forecast before each session ensures the fresh render has sufficient dry time to cure without frost 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 Xenotest accelerated weathering trials for long-term UV resistance — so the finish resists yellowing and fading far better than a surface-applied masonry paint. 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 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.
Technical Documentation