ATLAS SILICONE RENDER GREY 25kg

For mid-tone and darker SAH tints, Atlas Silicone Render Grey 25 kg builds full colour depth faster than a white-base equivalent — 1.5 mm hand coverage from 2.2 kg/m² (≈ 11.4 m² per bucket), tinted on site at our Southampton warehouse. DoP 145/3/CPR confirms compliance to EN 15824:2017 for ETICS finish coats.

Where Atlas Silicone Render Grey Performs Best on UK Facades

For contemporary grey facades and any tinted shade from warm sandstone through to deep charcoal, Atlas Silicone Render Grey 25 kg delivers a ready-mixed, fibre-reinforced silicone finish that reaches richer colour depth in fewer coats than a white-base equivalent — A2-s1, d0 reaction to fire, V2 vapour permeability, and ETA references ETA-06/0081, ETA-06/0173, and ETA-16/0933 complete the certification chain for Building Control sign-off. 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 grey base is the correct starting point whenever pigment loading matters: mid-tone shades, deep architectural greys, terracotta, ochre, charcoal, and any deep tint from the 480-shade SAH palette. Starting from a grey pigment rather than tinting up from white reduces both material consumption and on-site time, because the colour reaches uniform saturation across the elevation in a single application instead of requiring repeat coats to bury a brighter base.

Why Trade Specifiers Choose Atlas Silicone Render Grey

• Deeper colour saturation in fewer coats: the grey pigment base reaches full colour depth on mid-tone and dark SAH shades faster than a white base, cutting material consumption and on-site labour on contemporary facades that need a rich, even finish.
• 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 darker shades looking sharp without manual washing or repainting.
• Crack-bridging flexibility: cellulose-fibre reinforcement and 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 on a dedicated Atlas machine 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 or finish durability.
• V2 high vapour permeability: Sd between 0.14 m and 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: the inorganic-organic pigment system validated by Xenotest accelerated weathering trials keeps darker shades true to spec long after standard masonry paints would have faded or bloomed.

Technical Specifications — Atlas Silicone Render Grey Data Sheet Highlights

Property	Value
Pack size	25 kg plastic bucket
Colour base	Grey (Platinum) — 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 Grey — Mixing, Pot Life, Coverage

The bucket arrives ready for the wall — no thinning, no additions, no proprietary mixing components. Power-stir the mass with a low-speed paddle mixer for 30–60 seconds immediately before each load to even out consistency. A cured reinforced basecoat with embedded alkali-resistant Atlas reinforcement mesh (150 g/m²), primed with Cerplast or Ceresit CT 16 from the exterior render primer range, is the foundation that releases the finish coat's full self-cleaning and crack-bridging performance.

Hold a stainless-steel trowel at a low angle and lay the render at aggregate thickness across each panel, returning excess material to the bucket and re-stirring between loads. Texture the surface immediately afterwards using a plastic float in steady circular motions until the lambskin grain pulls through evenly. Plan each elevation as a single continuous wet-edge pass so the leading band never skins before the next is laid — that one discipline is decisive on darker grey tints, where any join or pace shift reads clearly 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, 2.2 bar) or Graco RTX 5500 PX with 6 mm round nozzle at medium feed.
• Hose conditioning: run a small charge of Silkon ANX or Cerplast through the machine line before the first render bucket so the hose interior is wet and the first pull comes through clean.
• Open time and mixing: ready-mixed — re-power-stir if the bucket 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

Cure quality begins long before the first trowel touches the wall. Allow the primed basecoat at least three days at +20 °C to season fully, with the substrate stable, dust-free, and dry to the touch. Choose a working window between +5 °C and +30 °C with relative humidity below 80 %, and shield the fresh surface from direct sun, wind, and rain through the full 24-hour cure.

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.

Keep all buckets for a single elevation on the same manufacture date so batch-driven shade drift cannot creep in across the wall. Plan technological breaks before the day starts — corners, sill lines, downpipes, and recessed details all hide a joint, while mid-panel pauses do not. Rinse tools in clean water immediately at break time; Atlas Resin Away handles any cured residue.

Pro Tips From UK Installers Using Atlas Silicone Render Grey

Dark and mid-tone facades reward different trade habits than bright whites — pigment depth, solar gain, and the way raking light shows joint discipline all shift the priorities. The tips below reflect what experienced UK applicators do differently when the spec calls for a deeper SAH tint on the grey base.

• Check HBW before committing the order: the standard Hoter U2 reinforced basecoat supports tints with Heat Brightness Value above 15 %; for darker shades down to HBW 6 %, switch the basecoat to Atlas Stopter K-100 to maintain colour stability and system performance.
• Mind solar gain on south elevations: very dark shades on south-facing walls absorb significant heat — for HBW values close to the minimum, brief the client on movement margins and confirm system warranty conditions before ordering.
• Plan technological breaks at architectural lines: stop at corners, sill lines, or downpipes rather than mid-wall, because dark tints make any pace-related shade difference far more visible than the same difference would be on white.
• Sample bespoke shades at full scale: when a client supplies a RAL or NCS reference outside the SAH book, tint a single bucket and lay it across a 1 m² panel under daylight before committing the order — saturated tints read very differently on the wall than on a chip.
• Keep batch dates aligned: for a single facade, order all buckets in one delivery so manufacture dates match — even minor batch drift is visible on a saturated mid-tone or dark finish.

Is Atlas Silicone Render Grey Right for Your Project?

• Choose this render if: you want a contemporary grey facade or a rich mid-to-dark tinted finish on a residential or commercial project — the grey pigment base reaches full colour depth in fewer coats than a white base, the 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 pure whites and the lightest tints: switch to Atlas Silicone Render White 25 kg — same silicone-siloxane formula with a white pigment base that preserves brightness on the lightest shades and benefits from high solar reflectance on south-facing elevations.
• 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 and substrate compatibility historic facades need.
• For plinth and splash zones: pair the grey 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 against the project orientation and lighting before ordering — dark and mid-tone renders behave very differently in north light versus south, and a chip under workshop lighting can mislead at scale.

FAQ — Atlas Silicone Render Grey 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.

Is the grey base 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. Both carry DoP 145/3/CPR under EN 15824:2017, A2-s1 d0 reaction to fire, and V2 vapour permeability. The grey variant delivers richer colour saturation for mid-tone and dark tinted finishes; the white variant is optimised for the lightest shades and pure whites where high solar reflectance reduces thermal stress.

How dark a tint can I specify on the grey base?

The standard system with Atlas Hoter U2 reinforced basecoat supports colours with a Heat Brightness Value above 15 %. Switching the basecoat to Atlas Stopter K-100 dispersion adhesive compound extends the range down to HBW 6 %, covering the great majority of the deeper SAH shades. For very dark shades on south-facing elevations, confirm with our technical team that the system specification matches the client's warranty and movement-margin expectations.

Can Atlas Silicone Render Grey 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 the two 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 coat has dry time to cure without frost interruption.

Will the grey or tinted finish fade over time?

The pigment system is integrated throughout the full depth of the render using hybrid inorganic-organic pigments 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 your chosen shade stays visibly consistent between natural rain washes for the full facade service life.

Is the grey variant 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.

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