Description
Where the 10 kg Mosaic Render Bucket Fits on a UK Facade
Ceresit CT177 mosaic render 10kg is a 1.0–1.6 mm coloured-quartz plaster declared to EN 15824, and the small bucket suits plinth returns, window and door jambs and detail repairs where a 25 kg pack would overshoot. Both packs sit in the mosaic renders for plinths collection at Renders World, and both carry Declaration of Performance No. 00469.
The data sheet's own application list is narrower, and more useful, than "decorative finish" suggests. Read as a list of zones, it settles quickly whether one small bucket is the right order.
- Plinths, balustrades and jambs — the outdoor surfaces the sheet names as quick to soil, and the ones usually finished in short runs.
- Entrances, corridors and staircases — the indoor surfaces it names as exposed to abrasion and dirt, worked in panels rather than elevations.
- The facade layer over insulation — inside the Ceresit Ceretherm systems the sheet assesses, which is how the plinth zone of an insulated wall is closed off.
- A hard face at splash height above plinth and below-DPC insulation boards, where road spray and knocks arrive together.
Why Installers Order the Small Pack for Detail Work
Four declared properties earn this material its place at the bottom of a wall, and one line about batch numbers decides how a small pack is ordered. Renders World lists both bucket sizes so a detail zone can be priced without buying volume it will not use.
- Impact resistance, category I to ETAG 004 — the classification that counts where a surface sits within reach of bags, boots and barrows.
- Water absorption W3, w ≤ 0.1 kg/m²·h⁰·⁵ to EN 15824 — splashback and driven rain stay on the face rather than soaking in.
- Vapour permeability V2, 0.14 ≤ Sd < 1.4 m to EN 15824 — moisture in the wall keeps a route outward through the finish.
- Scrub-resistant and easy to keep clean, in the sheet's own terms, so a shaded return responds well to washing; the guide to red and green algae on render covers what to reach for.
- One production batch per plane — the sheet asks for a single batch number across one surface, so a small bucket is bought for a self-contained zone rather than to top up a larger run.
How to Read the CT 177 Specification Before You Order
Every value below is declared for the plaster itself and carries the standard it was declared under, taken from the current Ceresit data sheet. Three rows repay a second look, and they are explained beneath the table.
| Property | Declared value |
|---|---|
| Grain size | 1.0–1.6 mm coloured quartz grits |
| Base | Aqueous synthetic resin dispersion, coloured mineral fillers |
| Density | approx. 1.75 kg/dm³ |
| Adhesion | 0.6 MPa, EN 15824 |
| Water absorption | category W3, w ≤ 0.1 kg/m²·h⁰·⁵, EN 15824 |
| Water vapour permeability | category V2, 0.14 ≤ Sd < 1.4 m, EN 15824 |
| Water vapour, ETAG test | Sd ≤ 1.0 m, ETAG 004 |
| Thermal conductivity | λ = 0.61 W/(m·K), EN 15824 |
| Impact resistance | category I, ETAG 004 |
| Application temperature | +10 °C to +25 °C, air and substrate |
| Relative humidity during work | below 80% |
| Preliminary drying time | approx. 30 minutes |
| Rain resistance | after approx. 3 days |
| Maximum water addition | 250 ml per 25 kg of plaster |
| Shelf life | 12 months from production, protect from frost |
| Declaration of Performance | No. 00469, EN 15824 |
| Published coverage rate | not published here — see the ordering note below |
The vapour figure appears twice: category V2 under EN 15824 is the product's own classification, while Sd ≤ 1.0 m comes from the ETAG 004 regime applied to a system. Quote the EN 15824 line when a specifier asks what the render is classified as.
Reaction to fire belongs to the system, not to the bucket. Under EN 13501-1 the sheet declares class B-s1,d0 in Ceresit Ceretherm Visage and class B-s2,d0 in Ceretherm Popular, Classic and Premium — results for those assemblies, which a wall carries only when it is built as one of them.
The λ of 0.61 W/(m·K) is the conductivity of a decorative layer a couple of millimetres thick, so it belongs inside a build-up calculation rather than standing alone as a wall U-value.
Applying Mosaic Render from a 10 kg Bucket Without a Processing Break
A detail zone is finished in one visit, and Ceresit CT177 mosaic render 10kg is packed for exactly that. Preliminary drying begins at around 30 minutes, so the size of the panel you open a bucket for is the decision that carries the finish.
- Stir the bucket to a homogeneous consistency with a slow-speed drill and basket mixer. Prolonged, intensive stirring discolours the aggregate and aerates the mass, so stop at even.
- Cap any water addition at 250 ml per 25 kg of plaster. The sheet states that limit against a 25 kg pack, so keep an addition to a smaller bucket proportionately under it, measured rather than poured by eye.
- Lay it on with a stainless steel trowel at a minimum of 1.5 times the grain thickness, evenly across the panel.
- Work wet-on-wet on one plane, holding the same consistency throughout and smoothing out as you go.
- Tape any unavoidable break: run self-adhesive tape along a defined line, apply, smooth, then pull the tape with the fresh material on it and restart from that edge.
Two prohibitions sit alongside those steps, both explicit on the sheet: do not sprinkle the plaster with water, and do not trowel the surface back once smoothed. Trade practice adds one more — run the passes in a single direction, because a circular action rearranges the grits into swirls that low winter sun finds later.
Quantities are the one thing this page leaves open: no coverage rate and no bucket count are published here. That hold sits on the record rather than on the document, so confirm your measured area with Renders World before ordering. The mosaic plinth application guide walks the same sequence in site order.
Priming and Colour Limits Before the Mosaic Goes On
Every declared substrate reaches this plaster through a quartz key coat, and the sheet names Ceresit CT 16 for the job with a waiting time for each background. Getting that sequence right is what lets a small repair patch settle invisibly into the wall around it.
- Cement and cement-lime plasters over 28 days old, primed with CT 16.
- Concrete over three months old at a moisture content of 4% or less, primed with CT 16.
- Mesh-reinforced layers in Ceresit ZU, CT 85, CT 190 or CT 100 mortar over three days old, and CT 87 mortars over two days old.
- Absorbing backgrounds, primed with CT 17 first and then CT 16 after a minimum of two hours.
Trade-size exterior render primers are stocked alongside the mosaic at Renders World, and the CT 16 sheet puts consumption at 0.3–0.5 kg/m² depending on how smooth and absorbent the background is, drying in approximately 3 hours before the mosaic follows. Tinting it close to the aggregate colour is the sheet's own recommendation, and it shows most on a single reveal.
Colour carries one documented limit worth planning around. The sheet recommends a light reflection coefficient HBW of 20 or above, asks for consultation with Ceresit's technical department below that figure, and confines intense dark shades in a Ceretherm system to small areas such as plinths and architectural details — precisely the work a 10 kg bucket is bought for.
Choosing Between the 10 kg and the 25 kg CT 177 Bucket
Both buckets carry the identical formulation and the same declared values, so the choice is pack size against the area in front of you. Renders World lists them side by side for that reason.
| Pack | Price at last check | When to choose |
|---|---|---|
| Ceresit CT 177 — 10 kg bucket | £39.50 per bucket, August 2026 | Reveals, jambs, short returns, repairs |
| Ceresit CT 177 — 25 kg bucket | £79.00 per bucket, August 2026 | Continuous plinth runs, repeat elevations |
Stock states move between visits: at the August 2026 check the 10 kg bucket was showing as in stock and the 25 kg pack as out of stock, so confirm availability there before planning a continuous run.
Is the Small Bucket the Right Order for Your Detail Zone?
- Order the 10 kg pack for a pair of reveals, an entrance surround, a short plinth return or a colour-matched repair, where a larger bucket would sit half-used.
- Move up to the 25 kg bucket for a continuous plinth run, since one production batch across a single plane is what the sheet asks for.
- Pair mosaic detail with a different finish above the DPC — the decorative facade design guide covers how the two are set out.
- Add the key coat to the same order, tinted close to the mosaic shade, so priming is dry and settled before the trowel comes out.
Ceresit CT177 mosaic render 10kg was listed at £39.50 per 10 kg bucket as displayed in August 2026, in stock at that check.
CT 177 Ordering, Compatibility and Site Conditions: Common Questions
Which primer goes underneath, and how long before rendering?
Ceresit CT 16 is the quartz key coat named on the CT 177 sheet, applied in a colour close to the mosaic and left for approximately three hours. Absorbing backgrounds take CT 17 first, with a minimum of two hours before the CT 16 goes on.
What site conditions does the sheet allow for?
Air and substrate between +10 °C and +25 °C with relative humidity below 80%, in dry conditions, with the fresh rendering protected by nets or tarpaulins until hardened. Rain resistance arrives after approximately three days, and a milky look while fresh clears as the surface dries.
Does the 10 kg pack perform differently from the 25 kg?
No — one formulation, one set of declared values and one Declaration of Performance, No. 00469, cover both bucket sizes. Pack weight and batch planning are the only practical differences, which is why the smaller bucket suits self-contained detail zones.
Does this plaster carry a fire rating?
Reaction to fire is declared for named assemblies rather than for the bucket: class B-s1,d0 in Ceresit Ceretherm Visage and class B-s2,d0 in Ceretherm Popular, Classic and Premium under EN 13501-1. A specific wall takes its rating from the system it is built as, confirmed with the system holder.
Technical Documentation Retrieved for This Page