Atlas Hoter U White EPS Adhesive Basecoat 25kg UK — 2-in-1 White Cement Bond for Certified EWI Systems

Achieving a flawless, bright foundation for your thin-coat render while saving time on priming is exactly what Atlas Hoter U White EPS adhesive basecoat 25kg UK is engineered to deliver. Formulated for high-performance EWI systems, this white eps adhesive uk functions seamlessly within our EPS adhesives & basecoats range to provide both a powerful bond for your boards and a bright, smooth receiver layer for the final finish.

As a core component of a certified system, it pairs perfectly with premium EPS insulation boards to create a robust, thermally efficient facade. By utilising high-grade white cement, this advanced adhesive significantly reduces the need for opaque tinted primers, speeding up the overall application process on site.

Key Benefits

• Saves Time and Primer: Your topcoat colours appear more vibrant and require less preparation, as the bright white formula eliminates the need to mask dark grey cement backgrounds.
• Dual-Purpose Efficiency: You can use a single product for both fixing the insulation and embedding the fibreglass mesh, reducing site waste and simplifying your material ordering.
• High Vapour Permeability: Your underlying masonry remains fully breathable, ensuring moisture naturally escapes through the reinforcement layer and out of the wall build-up, keeping the masonry dry and mould-free for the long term.
• Exceptional Flexibility: Your facade resists thermal expansion and microscopic movement, thanks to the advanced polymer matrix that flexes naturally with the building structure.
• Strong Early Grip: Your insulation panels stay firmly locked in place from the moment they are pressed to the wall, accelerating your installation timeline.

Technical Specifications

Parameter	Value
Pack Size	25 kg bag
Colour	White (premium white cement base)
Coverage — Board Fixing	4.0–5.0 kg/m² (approx. 5 m² per bag)
Coverage — Basecoat / Mesh	3.0–3.5 kg/m² (approx. 7 m² per bag)
Mixing Ratio	5.0–5.5 litres water per 25 kg bag
Pot Life	Approx. 4 hours at 20 °C
Open Time	Min. 25 minutes
Application Temperature	+5 °C to +25 °C (substrate and ambient)
Reinforced Layer Thickness	2–5 mm
Bond Strength to Concrete	≥ 0.25 MPa
Bond Strength to EPS	≥ 0.08 MPa
Certification	ETA-certified (Atlas ETICS) / BBA / NSAI

Application & Compatibility

Formulated for universal adhesion to mineral backgrounds, this dual-purpose mortar bonds securely to brickwork, concrete, and existing sound render. For a complete system, pair it with Atlas 150 g/m² fibreglass mesh to form the impact-resistant reinforced basecoat layer that protects your insulation and provides a stable canvas for the final decorative finish. The fibre-enhanced basecoats guide explains how the built-in structural microfibres in this formulation deliver long-term crack resistance across the full facade.

• Bonds exceptionally well to most standard exterior substrates without the need for intensive mechanical keying.
• Provides the ideal tension-free layer for embedding reinforcing fibreglass mesh over both white and graphite EPS boards.

Installation Notes

For the strongest reinforcement layer, apply the white basecoat to the insulation using a notched trowel, lay the mesh onto the surface, and firmly trowel it into the upper third of the adhesive, rather than pressing the mesh directly against a dry board and rendering over the top.

Trade Insight / Installer's Note

Using a white basecoat is a brilliant logistical upgrade when you are applying light-coloured silicone or acrylic topcoats — a single light pass of standard primer replaces the two thick coats of tinted primer that a grey base demands, saving hours of drying time and material cost. Combined with the same generous 4-hour pot life as the grey Hoter U, this white version gives your crew unbroken working time across wide elevations without the constant interruption of re-mixing. The structural microfibres in the mix lay flat under the trowel for a smooth finish that consumes noticeably less quartz primer at the next stage.

Is This Product Right For Your Project?

• Choose this product if: You are installing an EPS system and plan to use a white or light-coloured thin-coat render, aiming to save time on the priming stage.
• Need the standard grey version? The Atlas Hoter U Grey 25 kg adhesive in the same fibre-reinforced Hoter U range delivers identical 4-hour pot life and ETA-certified bond strength — the ideal base when your topcoat is a mid or dark shade where white cement offers no primer advantage.
• Working with rock mineral wool? For breathable A1-rated systems, Roker U grey 25 kg provides the high vapour permeability mineral wool boards require and is certified for slabs up to 300 mm as well as EPS up to 500 mm.

FAQ

How much wall area does a single 25kg bag cover?

A single 25kg bag typically covers around 5 to 6 square metres when used for fixing boards, or roughly 7 to 8 square metres when applied as the reinforced basecoat layer, providing excellent value for material estimation.

How should I dispose of the empty paper sacks?

The empty multi-wall paper bags can be safely processed with your standard site recycling streams, minimising hazardous waste and keeping your skip costs down.

Does this product carry system warranty protection for UK projects?

When applied within the manufacturer's specified parameters — maintaining a +5°C to +25°C substrate temperature — this white adhesive delivers long-term adhesion that meets the performance standards expected of professional UK rendering systems. Keeping a dated record of application conditions provides straightforward documentation for any future warranty or Building Control enquiry.

Can I skip the render primer entirely when using this white adhesive?

While the white colour brilliantly hides the base layer and saves you from needing deeply tinted primers, applying a standard manufacturer-approved primer is still recommended to equalise the substrate suction before floating your silicone topcoat.