ATLAS SILICONE RENDER WHITE BASE 25kg

Atlas Silicone Render White 25 kg covers up to 11.4 m² at 1.5 mm grain when applied by hand, tinted on-site at our Southampton warehouse to any of 480 SAH shades or bespoke RAL/NCS references. DoP 145/3/CPR confirms compliance to EN 15824:2017 for ETICS finish coats on new-build, retrofit, and listed-system facades.

Where Atlas Silicone Render White Performs Best on UK Facades

Atlas Silicone Render White 25 kg is a ready-mixed, fibre-reinforced silicone thin-coat finish delivering hand coverage from 2.2 kg/m² at 1.5 mm grain, classified A2-s1, d0 for reaction to fire and certified under ETA-06/0081, ETA-06/0173, and ETA-16/0933. It sits as the visible finish layer of the wider premium silicone render range, designed for ETICS build-ups over EPS, mineral wool, sound concrete, and traditional 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 preserve clarity rather than dulling against a coloured base. Every tub is tinted to your shade reference on a dedicated Atlas machine at our warehouse, so colour consistency runs across every bucket in your order — a meaningful advantage on long elevations where bucket-to-bucket variation would otherwise show under raking light.

Why Trade Specifiers Choose Atlas Silicone Render White

• Self-cleaning silicone surface: high silicone and siloxane resin content lowers surface tension so rainfall actively lifts dirt and urban pollutants from the finish, keeping the white visibly bright between natural washes for the full service life of the facade.
• Crack-bridging flexibility: cellulose-fibre reinforcement plus dedicated polymer resins absorb thermal movement and minor impacts, reaching 140 J impact resistance and hail resistance to 30 m/s in the Atlas Stopter K-100 system assembly.
• 480-shade SAH palette tinted on site: the full standard palette is mixed at our Southampton warehouse with no remote factory lead time, and bespoke colours matched to RAL, NCS, or other manufacturer references are mixed to order for projects outside the standard book.
• 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: Sd between 0.14 m and 1.4 m allows trapped moisture to escape outward through the render, protecting wall fabric from interstitial condensation across UK climate zones.
• UV-stable hybrid pigments: the inorganic-organic pigment system validated by Xenotest accelerated weathering trials keeps white tints true to spec long after standard masonry paints would have shifted toward yellow.
• Algae and mould resistance: In2 average water absorption combined with pH 8 surface chemistry suppresses biological growth even 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 (at 20 °C, 60 % RH)
Full cure time	≈ 24 h (at 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 is supplied as a ready-to-trowel paste — never thin with water, never blend with other materials, never adjust consistency with proprietary additives. A 30–60 second pass with a low-speed paddle mixer immediately before each load smooths the consistency and breaks any surface skin. The foundation underneath matters: a cured reinforced basecoat embedding the Atlas 150 g/m² fibreglass mesh, primed with Cerplast or Ceresit CT 16 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, taking back surplus into the bucket between loads. Texture immediately afterwards with a plastic float, rubbing in steady circular motions until the lambskin grain pulls evenly across the surface. Carry the wet edge across a full elevation in a single uninterrupted pass — never let one band skin before the next is laid, because that single discipline is what eliminates visible lap marks on white facades where any joint would otherwise stand out under afternoon raking light.

• Coverage at 1.5 mm hand: from 2.2 kg/m² — one 25 kg bucket covers approximately 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 machine line before render goes through — the wet interior keeps the first render pull clean and uninterrupted.
• Open time and re-stirring: ready-mixed — 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: approximately 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, see the thin-coat render application step-by-step guide for UK walls.

Installation Notes — Conditions, Drying Times, Finishing

White finish quality is decided at the basecoat stage: the primed reinforcement layer needs a minimum of three days curing at +20 °C before any render goes near it, with the surface stable, dust-free, and fully dry. Pick a working day inside +5 °C to +30 °C with relative humidity below 80 %, and keep the curing render shielded from direct sun, wind, and rain across the full 24-hour window.

For programmes that push into autumn or early spring, Atlas Eskimo (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 — temperature thresholds, humidity checks, and 48-hour forecast routine — is covered in the cold-weather rendering timing guide.

Run a single manufacture date across each elevation to keep batch-related shade variation out of the finished wall. Build technological breaks into the programme 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 immediately at break time; Atlas Resin Away clears any cured residue.

Pro Tips From UK Installers Using Atlas Silicone Render White

White finishes amplify every flaw the basecoat hides on darker shades, 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: running a 2 m straight edge across the cured reinforcement layer catches high spots and shallow dips that would otherwise read clearly under raking light on a white finish.
• Match HBW to the basecoat: for tinted shades the standard Hoter U2 system supports HBW above 15 %; specifications below that threshold are reinforced with Atlas Stopter K-100 to maintain colour and thermal performance.
• Plan technological breaks at architectural lines: stop at corners, sill lines, or downpipes rather than mid-wall, so any micro-difference in working pace is invisible in the final facade.
• Lay a 1 m² test panel for bespoke whites: for off-whites and warm creams matched to a RAL or NCS code, tint a single bucket and apply at full thickness on a sample panel under daylight before signing off — subtle shifts in pale tones read very differently at scale than on a chip.
• Keep the texturing rhythm tight: texture each band within minutes of trowelling on; once a wet edge skins, the lambskin pattern stops matching across the joint.

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 and the SAH palette gives you 480 standard shades plus bespoke matches mixed at our warehouse.
• For mid-tone or dark shades: switch to Atlas Silicone Render Grey 25 kg — same silicone-siloxane formula with a grey pigment base that achieves richer colour depth in fewer coats on contemporary darker facades.
• For heritage and conservation work: the Atlas silicone-silicate render 25 kg is usually a better fit for older lime-based walls — its more mineral chemistry offers the maximum vapour permeability historic substrates need.
• For plinth and splash zones: pair the white finish above DPC with a hard-wearing decorative finish from the mosaic render range to protect ground-level impact areas without compromising the facade aesthetic.
• Confirm the colour first: review physical chips from the colour charts and sample catalogues before ordering — daylight, orientation, and texture all shift how a tinted render reads on the finished elevation.

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.

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 requires a minimum of 220 kg — that 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 — anything with significant chroma or a low HBW reading — the grey-base variant delivers richer colour depth from the same silicone-siloxane formula with fewer coats. Our 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. Wagner PC 830 with a 6 mm nozzle at minimum feed (2/10, 2.2 bar) and 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. Hand and machine textures differ slightly, so different application methods should never be combined on the same elevation.

Can I apply this 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 shortens initial set, so the render is less vulnerable during the longer cold-weather drying window. Check a 48-hour forecast before each session to confirm 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 throughout the full depth of the render using a hybrid inorganic-organic pigment system validated by Xenotest accelerated weathering — UV resistance is significantly higher than a surface-applied masonry paint. The self-cleaning silicone surface also prevents airborne pollutants from embedding into the texture, so the white stays visibly bright between natural rain washes for the full 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 (EPD) — a third-party lifecycle assessment that architects and developers 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 ATLAS ETICS, ATLAS ETICS PLUS, ATLAS RENOTER, ATLAS ROKER, ATLAS GRAWIS, and ATLAS 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 mandatory across all substrates to control suction and ensure a uniform finish.

Technical Documentation — Atlas Silicone Render TDS and DoP

• 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