Description
The 10 kg Ceresit CT 177 mosaic render is the precision-quantity bucket within our mosaic renders collection — one pack delivers approximately 2.5 m² of resin-bound coloured-quartz finish at a confirmed yield of 4.0 kg/m², sized for a pair of window reveals, a short plinth return, or a colour-matched patch repair without surplus material left to skin in the tub.
Where the Ceresit CT 177 10 kg Pack Performs Best — UK Reveals, Returns, and Repairs
Ceresit CT 177 is a 1.0–1.6 mm acrylic mosaic plaster that achieves Category I impact resistance under ETAG 004 with W3 water absorption and V2 vapour permeability under EN 15824:2017, certified for plinth zones, reveals, and entrance surrounds on UK external wall insulation systems. In plain terms: the surface shrugs off knocks, repels driven rain, and lets the wall breathe — the trio of demands every facade detail zone has to meet. The 10 kg pack is identical in formulation to the trade-volume 25 kg CT 177 bucket — the only variable is bucket weight and the surface area each one covers. What changes is the job profile: the small pack is built for jobs measured in single square metres rather than full elevations.
Typical UK use sits in four places: window and door reveals (300–500 mm deep returns), short plinth sections where a 25 kg pack would overshoot, decorative accent panels around entrance porches, and colour-matched patch repairs on existing CT 177 facades. Specify it where precision beats volume.
Why Installers Keep the 10 kg CT 177 on the Van
- Right quantity, zero waste: The 2.5 m² coverage at 4.0 kg/m² is the closest stock format to a pair of window reveals or a short plinth return — finish the job without opening a 25 kg tub that would leave 60 % of the material to skin over in storage.
- Single-bucket, wet-on-wet pass: A 2.5 m² zone naturally fits inside the ~30-minute resin pot life, so each reveal or panel completes in one uninterrupted session with consistent viscosity from edge to edge.
- Impact-proof at the highest-traffic zone: Reveals and entrance surrounds absorb daily contact from keys, bags, and shoulders, and Category I impact resistance (ETAG 004) is the highest decorative thin-layer classification — knocks are absorbed without cracking or chipping the surface.
- Colour-matched callback repairs: Because pigment is bound inside each quartz grain rather than applied as a paint film, a patched section blends invisibly with an aged CT 177 finish — no shade drift between old and new, even years after the original installation.
- Rain off, vapour out: W3 water absorption (w ≤ 0.1 kg/m²·h⁰·⁵) keeps splashback off the reveal cill while V2 vapour permeability (Sd 0.14–1.4 m) lets trapped wall moisture migrate outward — essential on solid-wall reveals and plinth returns without a cavity.
- Flexes around openings: The acrylic-resin binder accommodates thermal movement concentrated around window and door frames, so detail zones stay seamless where a rigid cement-based finish develops hairline cracks at the most-stressed perimeter joints.
- Certified across Ceretherm systems: CT 177 holds European Technical Assessments across Ceresit Ceretherm Popular, Classic, Premium, Visage, and Wool Classic — the 10 kg pack remains the specified reveal-and-detail option within the same compliance pathway Building Control approves for the full plinth.
Technical Specifications — Ceresit CT 177 10 kg Data Sheet Highlights
Every performance value below applies equally to the 10 kg and 25 kg packs — the formulation is shared. The only variable is bucket weight and the area each one covers.
| Property | Value |
|---|---|
| Pack size | 10 kg bucket |
| Approximate coverage | ~2.5 m² per bucket |
| Yield | ~4.0 kg/m² |
| Grain size | 1.0–1.6 mm |
| Density | ~1.75 kg/dm³ |
| Base | Aqueous synthetic resin dispersion with coloured mineral fillers |
| Adhesion (EN 15824:2017) | 0.6 MPa |
| Water absorption (EN 15824:2017) | W3 · w ≤ 0.1 kg/m²·h⁰·⁵ |
| Vapour permeability (EN 15824:2017) | V2 · Sd 0.14–1.4 m |
| Impact resistance (ETAG 004) | Category I |
| Thermal conductivity (EN 15824:2017) | λ = 0.61 W/(m·K) |
| Application temperature | +10 °C to +25 °C |
| Preliminary drying time | ~30 min |
| Rain resistance | ~3 days |
| Fire reaction (EN 13501-1) | B-s1,d0 / B-s2,d0 (system-dependent) |
| Declaration of Performance | No. 00469 (EN 15824:2017) |
How to Apply the 10 kg CT 177 — Mixing, Coverage, and Pot Life
The 10 kg bucket arrives ready-tinted and ready to use — stir the full pack on a slow-speed drill with a basket mixer until the resin and aggregate reach a homogeneous consistency. A maximum of 100 ml of clean water may be added if consistency adjustment is needed (scaled proportionally from the 250 ml per 25 kg limit in the TDS) — staying at or under that cap preserves the certified 0.6 MPa bond strength and keeps the resin matrix delivering its full Category I impact performance.
Coverage planning is straightforward at the confirmed 4.0 kg/m² yield: one 10 kg bucket finishes approximately 2.5 m². Standard window reveals (300–500 mm depth × 1.5 m height) typically total 0.4–0.8 m² each, so a single bucket comfortably covers a pair of reveals or one entrance surround in a single session.
Apply with a stainless-steel float in a single direction at roughly 1.5× grain thickness (about 2.0–2.5 mm wet), letting the 1.0–1.6 mm aggregate settle into its natural random texture without circular trowelling. The resin begins curing within approximately 30 minutes, so a defined area of 2.5 m² or less naturally fits inside that working window — the full step-by-step mosaic plinth application method covers reveal cutting-in, taped break lines where two render types meet, and substrate-priming sequence.
Installation Notes — Reveals, Repairs, and Edge Finishing
Both air and substrate temperature should sit between +10 °C and +25 °C throughout application and for approximately three days afterwards while the acrylic resin cures — this range delivers the full cross-linking that produces the hard, weather-resistant, colour-stable surface. For small zones like reveals and entrance surrounds, localised polythene sheeting taped over the finished section is often enough to hold temperature and humidity below 80 % without dressing the full scaffold.
Prime mineral surfaces with a quartz primer from the render primers range before application — Ceresit CT 16 is the matched primer for CT 177 and should be tinted close to the chosen aggregate colour. On a single reveal, a primer-to-aggregate mismatch shows up more visibly than across a full elevation, so the extra minute spent tinting the CT 16 accurately pays off in a seamless finish. Mature cement or cement-lime plasters (28+ days old), concrete (3+ months old, moisture ≤ 4 %), and reinforced basecoat layers using Ceresit ZU, CT 85, CT 190, or CT 100 mortar (3+ days old) all bond securely once primed.
Where the mosaic finish meets a different render type — a silicone topcoat above the DPC, or a smooth render on a return — mask the boundary with adhesive tape before applying CT 177 and lift the tape while the material is still fresh. This produces a cleaner edge than cutting in against a cured neighbour, where the blade can disturb settled aggregate. Protect the finished section from rainfall for at least three days with localised sheeting to ensure a clean cure free of the temporary milky haze that can occur when uncured resin contacts water.
Pro Tips From UK Installers Using the 10 kg Pack
- Confirm the original batch code before a patch repair: The quartz aggregate is colour-stable across the life of the facade, so an exact batch match disappears invisibly into the existing finish; specifying by visual sample rather than the original code risks a slight tone gap that low sunlight will reveal.
- Tint the CT 16 primer to match the aggregate: On small areas, a grey-primer shadow behind the transparent resin reads more clearly than across a full plinth — pulling the CT 16 to within one shade of the mosaic colour eliminates the issue from the first pass.
- Open one bucket per zone: Treating each reveal or panel as a single-bucket job — rather than splitting a partly-used tub across multiple zones — keeps resin viscosity consistent and prevents the surface-skin contamination that comes from repeated lid removal.
- Float in one direction only: A linear pass lets the 1.0–1.6 mm aggregate settle naturally; circular trowelling produces swirl marks that are far more noticeable on a small isolated panel than across a broad elevation.
- Keep the bucket between +5 and +25 °C in the van: For callback work, storing the sealed pack within that range means the material is ready to trowel the moment you arrive on site — no waiting for cold resin to warm and re-mix.
Is the 10 kg CT 177 Right for Your Project?
- Yes — for reveals, repairs, and decorative accent panels: The 10 kg bucket covers approximately 2.5 m² of impact-resistant, colour-permanent mosaic finish — the right quantity for a pair of window reveals, a short plinth return, an entrance surround, or a colour-matched patch repair where a full 25 kg bucket would leave most of the material unused.
- Larger pack for full-house plinths: The Ceresit CT 177 in a 25 kg bucket covers approximately 6 m² using the identical formulation at the same 4.0 kg/m² yield — the trade-volume choice for complete house plinths, multi-elevation projects, and any job where batch-consistent coverage across larger areas matters more than precision quantity.
- Pairing mosaic detail with a silicone main facade: Where the 10 kg pack covers reveals or a plinth return below the DPC, a silicone or silicone-silicate topcoat offers higher self-cleaning performance across broad surfaces above — our decorative-facade design guidance covers dual-finish specification for projects combining mosaic detail and silicone main facade.
- Matched primer ordered at the same time: Browse the quartz primers range to specify CT 16 in the closest shade to your chosen aggregate — ordering primer and mosaic together avoids the most common cause of patchy coverage on a single reveal.
FAQ — Ceresit CT 177 10 kg Coverage, Compatibility, and Ordering
How many 10 kg buckets does a pair of window reveals need?
One bucket is usually sufficient for two standard window reveals, which together typically total 1.0–1.5 m² at the confirmed yield of approximately 4.0 kg/m². Measure each reveal's height and depth, multiply to get the total area, and add 10 % for edges and wastage — if the combined area exceeds 2.5 m², a second bucket ensures both reveals complete in a single wet-on-wet session without running short mid-application.
Is the 10 kg pack suitable for patching an existing mosaic plinth?
A single 10 kg bucket is the ideal format for patch repairs — its 2.5 m² coverage handles a localised plinth section, a damaged corner, or a reveal that needs refreshing without surplus material left over. Confirming the original batch colour code and ordering the matching shade keeps the repair invisible, because pigment sits within the quartz grains themselves and does not fade or shift with age. Applying CT 16 primer to the prepared repair area before rendering gives the resin an even-suction surface to grip, so the new section bonds as securely as the original.
Is the 10 kg pack the same formulation as the 25 kg?
Every performance characteristic is identical — the same transparent acrylic resin, the same 1.0–1.6 mm coloured quartz aggregate, the same Category I impact resistance, W3 water absorption, and V2 vapour permeability under EN 15824:2017. The only difference is bucket weight and the area each one covers: 10 kg finishes approximately 2.5 m², 25 kg finishes approximately 6 m². Choosing between them is a question of project scale, not performance.
What is the minimum application temperature for the 10 kg pack?
Both air and substrate temperature should remain between +10 °C and +25 °C throughout application and for approximately three days afterwards while the acrylic resin cures — this range delivers the full cross-linking that produces the hard, colour-stable surface. For small areas like reveals and entrance surrounds, localised polythene sheeting taped over the finished section is often enough to maintain conditions without dressing the full scaffold.
Is the 10 kg pack breathable enough for solid-wall reveals and plinth returns?
Moisture trapped in a solid masonry wall migrates outward through the mosaic render rather than accumulating behind it — the performance older properties without a cavity require. The V2 vapour-permeability rating (Sd 0.14–1.4 m under EN 15824:2017) confirms water vapour passes through the coating at a rate compatible with dense-brick and stone substrates, so a repaired reveal or replaced plinth section breathes exactly as well as the rest of the wall.
What's the shelf life of a 10 kg bucket once opened?
Unopened buckets stored between +5 °C and +25 °C remain workable to the printed shelf life on the lid (typically 12 months from production). For callback work, an opened bucket resealed tightly the same evening can be reused on the following morning with a brief re-stir — leaving the bucket open overnight allows the resin surface to skin, which then needs removing before the rest of the material is used.
Technical Documentation — Ceresit CT 177 TDS, DoP, and Certifications
- Ceresit CT 177 Technical Data Sheet (Henkel global English edition, PDF — shared across 10 kg and 25 kg packs)
- Declaration of Performance No. 00469 — EN 15824:2017 (W3 · V2 · 0.6 MPa adhesion · B-s1,d0 fire reaction system-dependent)
- European Technical Assessment coverage — Ceresit Ceretherm Popular, Classic, Premium, Visage, and Wool Classic EWI systems
Product information last reviewed by the Renders World technical team, May 2026, against the current Henkel TDS edition.