Description
Atlas Silicone Render White 25 kg covers up to 11.4 m² at 1.5 mm grain by hand, tinted on site at our Southampton warehouse to any of 480 SAH shades or a bespoke RAL/NCS match. DoP 145/3/CPR confirms compliance to EN 15824:2017 for ETICS finish coats, with V2 vapour permeability and an A2-s1,d0 fire classification.
Where Atlas Silicone Render White Performs Best on UK Facades
Atlas Silicone Render White is a ready-mixed, fibre-reinforced silicone thin-coat finish delivering hand coverage from 2.2 kg/m² at 1.5 mm grain, with V2 vapour permeability and an A2-s1,d0 reaction-to-fire classification under EN 13501-1. It is the visible finish layer of the wider premium silicone render range, designed for ETICS build-ups over EPS, mineral wool, sound concrete, and seasoned cement or cement-lime plasters.
The white base is the correct starting point for pure whites, soft creams, off-whites, and pale tints, where bright pigments keep their clarity instead of dulling against a coloured base. Every bucket is tinted to your shade reference on a dedicated Atlas machine at the Renders World warehouse, so colour runs consistently across an entire order — a real advantage on long elevations where bucket-to-bucket variation would otherwise show under raking light.
Why Trade Specifiers Choose Atlas Silicone Render White
The performance case for this finish sits in the resin chemistry rather than the colour alone, and the points below show where it earns its place on a specification.
- Self-cleaning silicone surface: high silicone and siloxane resin content lowers surface tension so rainfall lifts dirt and urban pollutants off the finish, keeping the white visibly bright between natural washes.
- Crack-bridging flexibility: cellulose-fibre reinforcement and dedicated polymer resins absorb thermal movement and minor impacts, reaching 140 J impact resistance in the Atlas Stopter K-100 system assembly.
- 480-shade SAH palette tinted on site: the full standard palette is mixed at the Renders World warehouse with no remote factory lead time, and bespoke RAL or NCS matches are mixed to order.
- Year-round application down to 0 °C: the standard +5 °C to +30 °C window extends to 0 °C with Atlas Eskimo setting accelerator, so winter programmes run without compromising cure quality.
- V2 high vapour permeability: an Sd of 0.14 m to 1.4 m lets trapped moisture escape outward through the render, protecting wall fabric from interstitial condensation across UK climate zones.
- UV-stable hybrid pigments: an inorganic-organic pigment system validated by Xenotest weathering trials holds white tints true long after a standard masonry paint would drift toward yellow.
- Algae and mould resistance: In2 average water absorption combined with pH 8 surface chemistry suppresses biological growth on shaded elevations and walls near greenery or water.
Technical Specifications — Atlas Silicone Render White Data Sheet Highlights
| Property | Value |
|---|---|
| Pack size | 25 kg plastic bucket |
| Colour base | White — tintable to 480 SAH shades + bespoke RAL / NCS |
| Grain size options | 1.5 mm (N-15) · 2.0 mm (N-20) |
| Density | ≈ 1.9 g/cm³ |
| Coverage — 1.5 mm hand | From 2.2 kg/m² (≈ 11.4 m² per bucket) |
| Coverage — 1.5 mm machine | From 1.9 kg/m² (≈ 13.2 m² per bucket) |
| Coverage — 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 min (20 °C, 60 % RH) |
| Full cure time | ≈ 24 h (20 °C, 60 % RH) |
| Shelf life | 12 months from manufacture date |
| Standard | EN 15824:2017 |
| DoP | 145/3/CPR |
| ETA references | ETA-06/0081 · ETA-06/0173 · ETA-16/0933 |
How to Apply Atlas Silicone Render White — Mixing, Pot Life, Coverage
The product arrives as a ready-to-trowel paste, so it never needs thinning with water or blending with other materials. A 30–60 second pass with a low-speed paddle mixer immediately before each load evens the consistency and breaks any surface skin. The foundation underneath decides the result: a cured reinforced basecoat embedding the Atlas 150 g/m² fibreglass mesh, primed with a quartz primer from the exterior render primer range, is what lets the finish coat develop full self-cleaning and crack-bridging performance.
Spread the render across each panel with a stainless-steel trowel at aggregate thickness, drawing surplus back into the bucket between loads. Texture immediately with a plastic float, rubbing in steady circular motions until the lambskin grain pulls evenly. Carry the wet edge across a full elevation in one uninterrupted pass, because that single discipline keeps lap marks off white facades where any joint would stand out under afternoon light.
- Coverage at 1.5 mm hand: from 2.2 kg/m² — one 25 kg bucket covers roughly 11.4 m² on an even basecoat.
- Machine application: 1.5 mm grain only — Wagner PC 830 with 6 mm nozzle at minimum feed (2/10), or Graco RTX 5500 PX with 6 mm round nozzle at medium feed.
- Line conditioning: pump a charge of Silkon ANX or Cerplast through the line before render, so the first pull runs clean.
- Re-stirring: a second 30-second power-stir handles any bucket that has stood more than 10 minutes; never add water, retarder, or proprietary mortars.
- Drying window: about 15 min surface dry and 24 h full cure at 20 °C and 60 % RH; protect from rain, wind, and direct sun across that window.
For the full professional method from basecoat preparation through final texturing, follow the thin-coat render application step-by-step guide for UK walls.
Installation Notes — Conditions, Drying Times, Finishing
White finish quality is settled at the basecoat stage. The primed reinforcement layer needs at least three days curing at +20 °C before any render goes near it, with the surface stable, dust-free, and fully dry. Choose a working day inside +5 °C to +30 °C with relative humidity below 80 %, and shield the curing render from direct sun, wind, and rain across the full 24-hour window.
For programmes pushing into autumn or early spring, Atlas Eskimo at 0.25 kg per 25 kg bucket extends the working range to 0 °C and shortens initial set, so the render is less vulnerable through the longer cold-weather drying window. The full seasonal protocol of temperature thresholds, humidity checks, and the 48-hour forecast routine is covered in the cold-weather rendering timing guide.
Run a single manufacture date across each elevation to keep batch shade variation out of the finished wall. Plan technological breaks before scaffolding goes up: corner returns, sill lines, downpipes, and recess details all hide a joint, while mid-panel pauses on a white finish never do. Tools rinse in clean water at break time, and Atlas Resin Away clears any cured residue.
Pro Tips From UK Installers Using Atlas Silicone Render White
White finishes show every flaw that darker shades forgive, so the trade discipline shifts toward preparation rather than the finish coat itself. The tips below reflect what experienced UK applicators do differently when the spec calls for a bright white facade.
- Straight-edge the basecoat before priming: a 2 m straight edge across the cured reinforcement layer catches high spots and shallow dips that would read clearly under raking light on white.
- Match the system to the light reflectance: for tinted shades the standard Hoter U2 system supports HBW above 15 %, while specifications below that are reinforced with Atlas Stopter K-100 to hold colour and thermal performance.
- Stop at architectural lines: plan technological breaks at corners, sill lines, or downpipes rather than mid-wall, so any micro-difference in pace stays invisible.
- Lay a 1 m² test panel for bespoke whites: tint a single bucket and apply at full thickness under daylight before sign-off, since pale tones read very differently at scale than on a chip.
- Keep the texturing rhythm tight: texture each band within minutes of trowelling on, because once a wet edge skins the lambskin pattern stops matching across the joint.
How Atlas Silicone Render White Compares to the Grey Base
White and grey share the identical silicone-siloxane formula and differ only in pigment base, which decides the cleanest route to your target shade. The table below positions this white SKU against its sibling base so you can choose by colour intent.
| Variant | Key Spec | When to Choose |
|---|---|---|
| Atlas Silicone Render White 25 kg | White base · HBW-bright tints | Pure whites, creams, pale pastels |
| Atlas Silicone Render Grey 25 kg | Grey base · deeper chroma | Mid-tone and dark contemporary shades |
Is Atlas Silicone Render White Right for Your Project?
- Choose this render if: you want a bright, low-maintenance white or light-toned finish on a modern house, extension, or fully insulated EWI build — 1.5 mm grain delivers up to 11.4 m² per 25 kg bucket with 480 standard shades plus bespoke matches.
- For mid-tone or dark shades: switch to the Atlas Silicone Render Grey 25 kg, which achieves richer colour depth in fewer coats on darker facades.
- For heritage and conservation work: the Atlas silicone-silicate render 25 kg suits older lime-based walls, with more mineral chemistry for the maximum vapour permeability historic substrates need.
- For plinth and splash zones: pair the white finish above DPC with a hard-wearing finish from the mosaic render range to protect ground-level impact areas.
- Confirm the colour first: review physical chips from the colour charts and sample catalogues before ordering, since daylight, orientation, and texture all shift how a tinted render reads.
To work out the exact bucket count for your project area, the render coverage calculator for UK projects converts m² and grain size into a clean order quantity with sensible waste allowance. The Renders World technical desk confirms the right base and system before dispatch.
FAQ — Atlas Silicone Render White Coverage, Compatibility, Ordering
How many 25 kg buckets do I need for 100 m² at 1.5 mm grain?
At 1.5 mm hand-applied, consumption starts from 2.2 kg/m², so 100 m² needs a minimum of 220 kg, which is nine buckets. Adding 5–10 % for waste, corner detailing, and uneven substrates brings a practical order to 10–11 buckets. At 2.0 mm grain, consumption rises to 2.8 kg/m², requiring at least 12 buckets for the same area.
When should I specify the grey base instead of white?
The white base gives the cleanest result on pure whites, soft creams, off-whites, and pale pastels, because the white pigment enhances brightness rather than dulling it. For mid-tone and darker shades with significant chroma or a low HBW reading, the grey-base variant delivers richer colour depth from the same formula in fewer coats. The Renders World team confirms the correct base when you supply the colour reference.
Can Atlas Silicone Render White be applied by machine?
Yes — the 1.5 mm (N-15) grain is approved for machine application. The Wagner PC 830 with a 6 mm nozzle at minimum feed (2/10, 2.2 bar) and the Graco RTX 5500 PX with a 6 mm round nozzle at medium feed are both validated by Atlas. The 2.0 mm grain is hand-applied only, and hand and machine textures differ slightly, so the two methods should never be combined on the same elevation.
Can I apply this render in winter?
Standard application needs a minimum air and substrate temperature of +5 °C. Adding Atlas Eskimo setting accelerator at 0.25 kg per 25 kg bucket extends the working range to 0 °C and shortens initial set, so the render is less vulnerable through the longer cold-weather drying window. Check a 48-hour forecast before each session so the fresh render has dry time to cure without frost interruption.
Will the white finish yellow or discolour over time?
The white pigment is integrated through the full depth of the render using a hybrid inorganic-organic pigment system validated by Xenotest accelerated weathering, so UV resistance runs well above a surface-applied masonry paint. The self-cleaning silicone surface also keeps airborne pollutants from embedding in the texture, so the white stays visibly bright between natural rain washes for the facade service life.
Is Atlas Silicone Render environmentally certified?
The render is a water-based formulation containing no solvents, and its environmental performance is independently verified through a Type III Environmental Product Declaration, a third-party lifecycle assessment that architects can reference in BREEAM or sustainability submissions. The long service life and self-cleaning behaviour also reduce maintenance chemicals and repainting cycles over the building lifetime.
Which substrates and systems is this render compatible with?
The product is approved within the ATLAS ETICS, ETICS PLUS, RENOTER, ROKER, GRAWIS, and THERMO PLUS thermal insulation systems on EPS and mineral wool, and it performs equally well over sound concrete and seasoned cement or cement-lime plasters on renovation work. A quartz primer such as Cerplast or Ceresit CT 16 is required across all substrates to control suction and ensure a uniform finish.
Technical Documentation — Atlas Silicone Render TDS, DoP, Certificates
- Atlas Silicone Render — Technical Data Sheet (PDF)
- Declaration of Performance: 145/3/CPR — EN 15824:2017 (current edition)
- ETA references: ETA-06/0081 · ETA-06/0173 · ETA-16/0933