Machine CT174 Silicasilicon Render 1.0 mm — Spray-Applied Silicate-Silicone Finish (25 kg)

Product Overview

Designed exclusively for professional spray rigs, Machine CT174 silicasilicon render 1.0 mm is a silicate-silicone hybrid decorative plaster that delivers a fine stone-textured facade finish at a coverage rate of approximately 1.5 kg/m² — giving you roughly 16–17 m² from a single 25 kg tub. Sourced from the premium silicone render collection at Renders World, this machine-applied vapour permeable render combines the mineral hardness of silicate binders with the flexibility and hydrophobicity of silicone technology, creating a double-action finish that repels rain on the outside while letting internal moisture escape freely through the wall.

CT174 Machine produces a facade that breathes efficiently, sheds rainwater naturally, and bonds firmly to properly prepared substrates across all UK climate zones — backed by EN 15824:2017 certification with V2-rated vapour permeability (Sd 0.14–1.4 m, so internal moisture escapes freely), W3-rated low water absorption (w ≤ 0.1 kg/m²h⁰·⁵, meaning rain beads off rather than soaking in), and 0.6 MPa substrate adhesion — certified as a system component within Ceresit Ceretherm ETICS assemblies (ETA 08/0309, 09/0014, 08/0308, 09/0037, 09/0026). Available in the full Ceresit Colours of Nature palette — 516 factory-mixed shades spanning six curated collections (Wise & Confident, Grey Vibes, Harmonious & Balanced, Romantic & Delicate, Energetic & Positive, and Intense & Expressive), the 1.0 mm aggregate produces the finest stone texture in the CT174 range with through-body pigmentation — meaning the colour runs all the way through the render mass, so minor surface scuffs never expose a different shade underneath. This makes CT174 Machine the go-to specification for large commercial elevations where spray-applied uniformity, rapid site coverage, and lasting colour consistency are essential.

Key Benefits

• Maximum Site Speed on Large Facades: Your team covers more wall area per shift because the 1.0 mm grain is formulated for pump-and-spray equipment (PFT G4, Putzmeister, and similar professional units), flowing evenly through a ≥6 mm nozzle without clogging — so a two-person crew can finish a full commercial elevation in a fraction of the time hand application would require.
• Breathable Moisture Management: Your wall structure stays dry and healthy because internal moisture passes outward freely through the render layer — V2-rated vapour permeability (Sd 0.14–1.4 m to EN 15824:2017) ensures this moisture transfer happens continuously, keeping insulation at peak performance and indoor air quality high.
• Rain-Repellent Self-Cleaning Surface: Your facade stays visually clean for years because the silicone-siloxane binder creates a hydrophobic surface rated W3 to EN 15824 — rainfall beads across the finish rather than soaking in, carrying atmospheric dust, pollen, and urban pollutants away with every shower.
• Crack-Resistant Hybrid Formula: Your render moves with the building instead of splitting because the dual silicate-silicone binder absorbs seasonal thermal expansion and minor structural movement — the silicate component provides mineral hardness and UV stability while the silicone component adds the flexibility that keeps the finish intact through UK temperature cycling from summer highs to winter frosts.
• BioProtect Anti-Microbial Shield: Your north-facing and sheltered elevations resist biological growth because active biocidal agents embedded in the render mass inhibit algae, mould, and fungi — keeping the facade free from the green and dark staining that typically appears within two to three years on unprotected surfaces in damp UK conditions.
• Efficient Material Use: Your project budget goes further because the 1.0 mm grain uses approximately 1.5 kg/m² per layer — roughly 35–40 % less material per square metre than the 1.5 mm variant — so each 25 kg tub covers around 16–17 m², reducing both cost per square metre and the number of deliveries a large site requires.
• 516 Through-Coloured Shades with UV Stability: Your facade keeps its chosen colour for decades because every shade from the Ceresit Colours of Nature palette is mixed through the full 1.0 mm render thickness using UV-stabilised hybrid pigments — minor surface scratches never expose a grey substrate, and the finish never needs repainting to maintain its appearance.

Technical Specifications

Property	Value
Binder Type	Silicate-silicone hybrid resin (water dispersion of synthetic resins with mineral and pigment fillers)
Grain Size	1.0 mm (stone texture)
Pack Size	25 kg
Coverage Rate	Approx. 1.5 kg/m² (~16–17 m² per tub)
Density	1.9 kg/dm³
Vapour Permeability	V2 (Sd 0.14–1.4 m) — EN 15824:2017
Water Absorption	W3 (w ≤ 0.1 kg/m²h⁰·⁵) — EN 15824:2017
Adhesion to Substrate	0.6 MPa — EN 15824:2017
Thermal Conductivity	λ = 0.61 W/(m·K) — EN 15824:2017
Application Temperature	+5 °C to +30 °C (air and substrate)
Open Time	Approx. 15 minutes
Rain Resistance	Approx. 24 hours after application
Recommended Nozzle	≥6 mm
Colour Range	Full Ceresit Colours of Nature palette (516 shades, through-body pigmented, UV-stabilised)
Biological Protection	BioProtect formula (algae, mould, fungi)
Standard Compliance	EN 15824:2017 (TDS verified November 2025)
System Certification	Ceresit Ceretherm ETICS (ETA 08/0309, 09/0014, 08/0308, 09/0037, 09/0026)
Primer Required	Ceresit CT 16 quartz primer (mandatory)
Shelf Life	12 months in original unopened packaging

Application & Compatibility

CT174 Machine integrates into the Ceresit Ceretherm ETICS build-up as the decorative finish layer, bonding to a cured reinforced basecoat that has been primed with Ceresit CT 16 quartz primer from the render primers range. Embedding Atlas 150 g/m² fibreglass mesh into the basecoat layer creates the stable, crack-resistant substrate that this fine-grain finish is designed to sit on — giving you a complete system from insulation board through to decorative top coat.

• Compatible Insulation Types: Performs as a certified finish over graphite EPS boards, standard EPS, mineral wool slabs, and XPS boards within ETICS assemblies — covering new-build facades, retrofit solid-wall insulation, and over-cladding projects across the UK.
• Substrate Versatility: Works best on reinforced basecoats made with Ceresit CT 85, ZU, CT 190, CT 100, or CT 87 adhesives over masonry, concrete, and existing well-bonded mineral renders — provided the surface is clean, dry, and primed with CT 16 at least 24 hours before rendering.
• Machine Equipment: Formulated for professional rendering units such as PFT G4 and SPG Baumaschinen PG 20, with a recommended minimum operating pressure of 2 bar and a nozzle aperture of ≥6 mm — always run a test panel on a spare board to calibrate consistency, flow rate, and operating pressure before committing to the facade.
• Weather Window: Scheduling application when air and substrate temperatures are between +5 °C and +30 °C with humidity below 80 % gives the render ideal curing conditions — the guide to when you can apply silicone render in the UK covers the full seasonal planning calendar for British weather.

Installation Notes

Getting the preparation right is the single step that determines the quality of your finished CT174 Machine facade. Stir the full tub contents with a low-speed mechanical mixer until the consistency is uniform, then adjust with up to 2 % clean water to suit your machine's flow characteristics — run a sample spray on a spare board to calibrate nozzle delivery rate and operating pressure before committing to the elevation. Hold the nozzle vertically at approximately 40–60 cm from the wall and apply in two passes using a circular motion (or one horizontal pass followed by one vertical pass, wet-on-wet) until the full 1.0 mm grain thickness is achieved with complete, even coverage.

For the cleanest finish, complete each elevation face in a single continuous operation rather than stopping and restarting — this eliminates the visible join lines that become apparent in raking light once the render cures. For the best curing results, check a 48-hour weather forecast before you start to confirm rain-free conditions for at least 24 hours after application, ensuring the silicate-silicone binder forms a fully cross-linked, durable film.

Trade Insight: Installer's Note

I always run a 1 m² test panel at the start of each project day to dial in the machine pressure and water addition — the 1.0 mm grain is noticeably more sensitive to consistency changes than the 1.5 mm variant, so spending five minutes calibrating saves hours of rework on a full elevation. The 15-minute open time means texturing needs to happen immediately behind the spray pass; on wide elevations I keep a second operative with a plastic float working no more than two metres behind the nozzle to close the surface before the silicate binder starts to firm. One surface, one batch number — that is the rule for the finest grain, because even minor pigment shifts between production runs become visible on a large, smooth facade. The machine vs hand-applied render guide covers equipment setup, crew coordination, and the full technique comparison for contractors weighing their options on large-scale projects.

Is This Product Right for Your Project?

• This is the right choice if you are a professional rendering contractor with spray equipment who needs to cover large commercial or multi-block residential facades quickly and uniformly with the finest stone texture available in the Ceresit silicate-silicone range. CT174 Machine's 1.0 mm grain covers approximately 16–17 m² per 25 kg tub at just 1.5 kg/m², with V2 vapour permeability, W3 water resistance, and 0.6 MPa adhesion certified to EN 15824:2017.
• Need a coarser grain for hand or mixed application? The CT174 1.5 mm silicate-silicone render in the same hybrid range offers a versatile stone texture suitable for both trowel and machine application at approximately 2.5 kg/m², covering around 10 m² per tub — making it the better fit for smaller domestic elevations, mixed-method projects, or sites where basecoat tolerances are harder to control.
• Looking for a pure silicone or BBA-certified system? For standard EWI retrofits and new builds where pure silicone hydrophobicity or third-party BBA certification is the priority, the Atlas Silicone Render and Atlas Gemini RS systems within the BBA-certified silicone render range offer matched formulations with the same next-day UK delivery.

Frequently Asked Questions

How many tubs of CT174 Machine 1.0 mm do I need for my project?

Each 25 kg tub covers approximately 16–17 m² at the TDS-verified application rate of 1.5 kg/m², so a 500 m² commercial facade typically requires around 30–32 tubs. Adding 5–10 % for detailing around window reveals, corners, and equipment priming waste ensures you have enough material to maintain continuous wet-on-wet application across each full elevation without a visible join line.

Can I apply CT174 Machine by hand as well as by spray rig?

CT174 Machine is optimised for spray application through a ≥6 mm nozzle at a minimum operating pressure of 2 bar, and this is the method that produces the most uniform 1.0 mm stone texture across large areas. Hand application with a stainless-steel float is possible for small touch-up areas or detail work, though the fine 1.0 mm aggregate demands a near-flawless basecoat and very consistent float technique to avoid visible thickness variation — for primarily hand-applied projects, the 1.5 mm CT174 silicate-silicone render gives a more forgiving application experience with the same double-binder performance.

What primer and basecoat does CT174 Machine require?

Ceresit CT 16 quartz primer is the mandatory preparatory coat, applied to the cured reinforced basecoat at least 24 hours before rendering to regulate suction and provide a mechanical key for uniform bonding. The basecoat itself should incorporate alkali-resistant fibreglass mesh at 150 g/m² embedded in a Ceresit-compatible cementitious adhesive (CT 85, ZU, CT 190, CT 100, or CT 87), cured for a minimum of two to three days at +20 °C before priming. Matching the CT 16 primer colour to the final render shade gives you the cleanest result by eliminating any show-through of a contrasting primer tone beneath the fine 1.0 mm aggregate layer.

Is CT174 Machine suitable for dark colours on south-facing elevations?

Every shade in the 516-colour Ceresit Colours of Nature palette is available as a through-body tint for CT174 Machine, so the colour you specify runs through the entire render thickness and resists fading thanks to UV-stabilised hybrid pigments. CT174 Machine handles mid-range and lighter shades confidently on any orientation, thanks to its flexible silicone component that accommodates the daily thermal cycling sun-exposed walls experience. For very dark colours with a Heat Brightness Value (HBW) below 25, Ceresit CT 76 Solar Protect render is the better specification — its nano-scale heat-reflective pigments actively manage solar thermal stress, keeping dark facades stable on south- and west-facing elevations where standard pigments can accelerate surface temperature build-up.

Is CT174 Machine an environmentally responsible choice?

CT174 Machine is a water-based formulation with very low volatile organic compound (VOC) content, so it produces minimal fumes during application — a practical benefit for installers working inside scaffold enclosures on large commercial projects. The 1.0 mm grain uses approximately 1.5 kg/m² of material per layer, a fraction of the 30–40 kg/m² that traditional sand-and-cement renders require at 15–20 mm thickness, which significantly reduces material consumption and site waste per square metre. Through-body colour eliminates the recurring resource use of periodic repainting cycles, and Ceresit's Eco Bucket packaging uses up to 62 % post-consumer recycled polypropylene.