Description
The Atlas Cerplast 15 kg bucket sizes the same BBA-certified quartz grip coat to a single elevation, covering roughly 45 m² at 0.3 kg/m² with the identical ≥1.0 MPa adhesion and SAH-tintable white base as the 25 kg pack, so extension, garage, and repair jobs order to the wall in front of them rather than leaving material standing on site.
Where the Atlas Cerplast 15 kg Pack Earns Its Place — Single-Elevation UK Jobs
A render topcoat that stays keyed for decades starts with a quartz grip coat, and on a focused job the 15 kg pack delivers that grip without over-ordering. Sitting in the Renders World render primer range, this mid-size bucket carries the full Atlas ETICS-certified performance in a quantity matched to a single elevation, extension side wall, garage facade, dormer cheek, or substantial repair area — the places where a 25 kg trade bucket would leave usable product standing between projects. Acrylic resin loaded with fine quartz aggregate deposits a rough, sand-textured film over the cured basecoat or sound masonry, so the decorative render holds physically rather than by chemical adhesion alone.
The pack works on the same substrates as the trade size — poured concrete, cement and lime plasters, brick and block masonry, plasterboard, and cured EWI basecoats over EPS, XPS, or mineral wool. It carries the same BBA Certificate 13/5018, ETA 06/0081, and NSAI 10/0347, so Building Control and warranty providers see identical documentation whichever pack went onto the job. For the full pre-render priming method, the quartz primer application guide covers tool selection and weather planning for UK conditions.
Why Trade Specifiers Choose the Atlas Cerplast 15 kg Pack
- Right-sized for single elevations: 45 m² per bucket matches a typical terraced or semi-detached front or rear wall, so the order tracks the actual job instead of leaving material standing between projects.
- Identical performance to the 25 kg pack: Same acrylic-and-quartz formulation, same ≥1.0 MPa adhesion verified under ETA 06/0081, same 4–6 hour drying, same SAH-tintable white base — pack size is the only difference.
- BBA and ETA certified system compliance: Listed under BBA Certificate 13/5018 and ETA 06/0081 within the Atlas ETICS system, so every layer from substrate to topcoat carries documented approval for Building Control and warranty providers.
- True colour accuracy via SAH tinting: The white base tints to up to 400 shades through the SAH colour system, matching the primer to the topcoat and preventing basecoat show-through on pastel and mid-tone finishes.
- Same-day workflow (4–6 hour drying): The 4–6 hour window at +5 °C to +30 °C means priming in the morning and rendering the same afternoon on most UK working days.
- Six-month weather protection if the project pauses: The cured film forms a temporary weather barrier protecting the primed facade for up to six months, useful when trade sequencing or weather delays the topcoat.
- Universal Atlas-system substrate compatibility: Handles concrete, cement and lime plasters, brick and block masonry, plasterboard, and EWI basecoats over EPS, XPS, or mineral wool from one mid-size pack.
Technical Specifications — Atlas Cerplast 15 kg Data Sheet Highlights
| Property | Value |
|---|---|
| Product type | Quartz-aggregate priming mass (ready-to-use) |
| Base | Acrylic resin + fine quartz aggregate |
| Density | ~1.5 g/cm³ |
| Adhesion to concrete | ≥1.0 MPa |
| Coverage rate | ~0.3 kg/m² (45 m² per 15 kg bucket) |
| Drying time | 4–6 hours (standard conditions) |
| Application temperature | +5 °C to +30 °C (substrate and ambient) |
| Application method | Roller, brush, or airless spray |
| Colour | White (tintable to up to 400 shades via SAH system) |
| Pack size | 15 kg plastic bucket (25 kg pack also available) |
| BBA certificate | 13/5018 (Atlas ETICS system) |
| ETA | 06/0081 |
| NSAI certificate | 10/0347 |
| Shelf life | 12 months (sealed, frost-free storage) |
| Compatible topcoats | Atlas silicone, acrylic-silicone, mineral, silicone-silicate, mosaic DEKO M |
| Manufacturer | Atlas Sp. z o.o. |
How to Size and Apply the Atlas Cerplast 15 kg Pack — Coverage Maths and Roller Technique
The 15 kg pack rewards a quick coverage calculation before ordering: divide the elevation area in square metres by 45 to get the bucket count at the standard 0.3 kg/m² rate, then round up. A 30–40 m² terraced or semi front takes one bucket with a margin for reveals; a 60–70 m² front-plus-gable takes two; beyond 75 m², the 25 kg pack becomes the more economical choice. On highly porous masonry or rough basecoats, consumption rises to 0.35–0.40 kg/m², so add 10–15 % on older brick or blockwork. New cement plasters need one week of curing per centimetre of thickness, and poured concrete needs at least 28 days.
Stir the bucket with a low-speed drill and clean paddle for 2–3 minutes to redistribute settled aggregate, then apply one even coat with a medium-nap roller (18–25 mm pile) on flat walls, a wide masonry brush for reveals, or an airless sprayer with an abrasive-rated tip. Work in sections no wider than one scaffold lift to hold a wet edge. Where the masonry is dusty or absorbent, a consolidation pass with Atlas Uni-Grunt stabilises the pore structure before Cerplast. Supplied ready to use, it is never diluted or mixed with other materials.
Installation Notes — Site Conditions, Drying Window, and Atlas System Sequence
Prime the whole elevation in one continuous session rather than in patches, because uniform priming equalises suction and keeps colour banding out of the finished topcoat. Start on the shaded side and follow the shade around rather than working in direct sun, which can skin the film before the aggregate beds in. Check substrate temperature with an infrared thermometer on shaded and north-facing walls, since surface temperature can sit several degrees below the air reading on cool mornings.
On a full Atlas ETICS build-up, Cerplast follows the cured basecoat and precedes the render: Uni-Grunt consolidates bare masonry, boards bond with system adhesive, a cementitious basecoat with embedded mesh forms the reinforcing layer, Cerplast deposits the quartz key, then an Atlas silicone, acrylic-silicone, mineral, or mosaic topcoat completes the silicone render finish. Clean tools with water immediately after use, before the resin cures onto fibres. Store sealed above +5 °C — frozen primer cannot be recovered by thawing.
Pro Tips From UK Installers Using the Atlas Cerplast 15 kg Pack
These are the working habits UK renderers rely on to size the pack correctly and lay a consistent quartz key — the payoff is the right amount of material and an even grip across the wall.
- Check the bucket count against elevation drawings first: Divide square metres by 45 and round up — one bucket suits a single elevation, two suit a front-plus-gable, three make the 25 kg pack the better buy.
- Tint to the topcoat shade on every project: Even mid-tone greys can flash white primer through at the thinnest points of a 1.5 mm grain, so SAH-tinting to the render shade is worth it on every job.
- Cross-hatch the roller pattern: Apply horizontal then vertical to distribute the quartz aggregate more evenly than a single-direction roll, giving the topcoat more consistent grip.
- Decant in summer heat: Above +25 °C, keep the bucket in shade and decant into a smaller tray every half hour to hold a consistent working consistency.
- Use an IR temperature check on shaded walls: A surface reading on north and east elevations catches the times the wall is still below +5 °C even after the air has warmed.
How the 15 kg Pack Compares to the 25 kg Bucket and Ceresit CT16
Cerplast comes in two pack sizes on one formulation, and Renders World also stocks the matched quartz primer for Ceresit systems. The table sizes the order to the elevation and matches the primer to the render brand.
| Variant | Key Spec | When to Choose |
|---|---|---|
| Atlas Cerplast 15 kg | ~45 m² · ≥1.0 MPa · BBA 13/5018 | Single elevation, extension, garage, repair |
| Atlas Cerplast 25 kg | ~75 m² · identical formulation · lower per-kg cost | Full-house and multi-elevation programmes |
| Ceresit CT16 Quartz Primer 10 L | Quartz grip coat · Ceresit-certified | Ceresit CT74, CT76, CT174 render systems |
Is the Atlas Cerplast 15 kg Pack Right for Your Project?
- Yes — for single elevations, extensions, garages, and repair areas: The 45 m² coverage matches a focused job exactly, the BBA and ETA certification satisfies Building Control and warranty providers, and the SAH-tintable base masks the basecoat under any topcoat shade.
- Running a full-house or multi-elevation programme? The Cerplast 25 kg bucket covering 75 m² uses the identical formulation in a trade pack — fewer bucket changes and a slightly lower per-kg cost across larger jobs.
- Specifying a Ceresit render system instead? The certified quartz primer for CT74, CT76, and CT174 topcoats is the Ceresit CT16 Quartz Primer 10 L — keeping every layer within one approved system gives the strongest warranty position.
- Working on dusty or deteriorated masonry first? Apply Atlas Uni-Grunt 5 kg as the consolidation pass before Cerplast — the two-coat sequence adds little cost and improves bond reliability across mixed substrates.
FAQ — Atlas Cerplast 15 kg Coverage, Sizing, and Certification
How many 15 kg buckets do I need for my elevation?
Measure the elevation in square metres, divide by 45, and round up. A 30–40 m² terraced or semi front elevation takes one bucket with material to spare; a 60–70 m² front-plus-gable takes two; anything beyond 75 m² makes the 25 kg pack more economical. On highly porous masonry or rough-textured basecoats, consumption rises to 0.35–0.40 kg/m², so add 10–15 % overage on older brick or blockwork to hold continuous coverage.
Is there any performance difference between the 15 kg and 25 kg packs?
None — the formulation, ≥1.0 MPa adhesion, 4–6 hour drying window, SAH tintability, substrate range, and BBA/ETA/NSAI certification are identical across both packs. The only differences are quantity (45 m² versus 75 m²) and a marginally lower per-kg cost on the larger bucket. Choose the 15 kg for single elevations and repairs where the 25 kg would leave material standing; choose the 25 kg once the job runs past about 75 m².
Can I tint the 15 kg Cerplast to match my render colour?
The white base tints to up to 400 shades via the SAH colour system, with pre-made brown, clinker, and graphite variants for Atlas DEKO M mosaic projects. Tinting the primer to the final render shade is standard professional practice: it stops the neutral white basecoat showing through the thinnest points of a textured topcoat, keeping the finished colour consistent from ground level to soffit.
Is Atlas Cerplast compatible with non-Atlas render topcoats?
Cerplast is certified within the Atlas ETICS system (BBA Certificate 13/5018) beneath Atlas silicone, acrylic-silicone, mineral, and mosaic renders. Using it under a non-Atlas topcoat falls outside the tested assembly, which may affect warranty coverage. For Ceresit render systems the certified quartz primer is Ceresit CT16, so keeping every layer within one approved system gives the strongest warranty position. The full primer-by-system breakdown sits in the primer selection guide.
Does the 15 kg pack meet UK building certification requirements?
Atlas Cerplast holds BBA Certificate 13/5018, ETA 06/0081, and NSAI 10/0347 as part of the Atlas ETICS thermal insulation system, and the 15 kg and 25 kg packs carry identical certification. These approvals confirm the full system — adhesive, insulation board, basecoat, primer, and render — has been independently tested as a single assembly, giving architects, developers, and Building Control officers the documentation needed to approve the installation.
What is the shelf life and storage requirement?
Atlas Cerplast carries a 12-month shelf life from production date, stored sealed and upright above +5 °C and below +25 °C, away from frost and direct sun. Frozen primer cannot be recovered by thawing, as the acrylic resin and aggregate separate irreversibly, so winter storage on unheated sites needs a frost-protected arrangement above +5 °C.
Technical Documentation — Atlas Cerplast TDS, BBA, and ETA Resources