What is EPS insulation made from?

EPS insulation is made from expanded polystyrene beads that are fused together to form rigid boards. This composition gives EPS its strength, durability and excellent thermal performance, making it ideal for use in residential, commercial and industrial insulation projects.

Where can EPS insulation be used?

EPS insulation is suitable for both external and internal wall insulation. It can be applied to masonry, timber and system-built properties, as well as used beneath renders or within cavity wall insulation systems. Its versatility makes it a popular choice for new-build and retrofit projects alike.

How is EPS insulation installed?

EPS boards are typically installed using a dual fixing method, adhesive and mechanical fixings, to ensure a secure hold. For best results, we recommend using EWI-220 EPS Basecoat Adhesive, a specially formulated product designed to bond EPS insulation boards securely to masonry and other substrates. Once the boards are fixed, they should be covered with a basecoat and reinforcing fibreglass mesh. The surface should be rasped or sanded before applying the basecoat to create a better key for adhesion. EPS can be finished with EWI-075 Silicone Render or EWI-040 Acrylic Render, both of which complement its non-breathable nature and provide a durable decorative finish.

Can EPS insulation be used internally?

Yes, EPS can also be used for internal wall insulation. However, external wall insulation generally achieves better results by preventing thermal bridging and reducing the risk of internal condensation.

Why is EPS insulation cost-effective?

EPS insulation offers exceptional performance at a lower price point compared to many other materials. Its lightweight structure means it requires less adhesive strength and uses plastic fixings rather than metal, reducing both material and labour costs without compromising quality.

What is the difference between EPS and XPS insulation?

EPS (Expanded Polystyrene) and XPS (Extruded Polystyrene) are made from the same base resin but produced using different processes. EPS is lighter, more affordable and ideal for wall insulation. XPS is denser and stronger, making it better suited for below-ground or flooring applications. Both materials deliver excellent thermal performance, but EPS is often preferred for external wall insulation systems due to its cost-effectiveness and ease of installation.

Is EPS insulation waterproof?

Yes, EPS insulation is highly water-resistant. It helps protect your property against damp and mildew, maintaining a healthy wall structure. For added protection, you can pair EPS insulation with a waterproof render such as Nano Drex Silicone Render or Premium Bio Silicone Render to enhance weather resistance.

Silicate Paint (EWI-002) - 5L

Brand: EWI Pro

SKU: EWI-002-5A

EWI-002 Silicate Paint is a highly breathable masonry paint designed for lime render, mineral render, concrete and external wall insulation systems.

The Silicate Paint chemically bonds to mineral surfaces to create a durable, matt finish that allows moisture vapour to escape while helping protect façades from weathering, UV exposure, water and dirt.

Ideal for older properties, listed buildings and breathable render systems, it offers long-lasting colour, excellent surface protection and a fresh, natural mineral finish.

£31.19 Incl. VAT

£31.19 Incl. VAT (regular price)

Please note: This product has a slightly longer lead time. Our team will notify you with an estimated delivery date.

Quantity:

EWI-002 Silicate Paint is a durable, breathable masonry paint designed for mineral surfaces and external wall insulation systems. Made with potassium water glass, it forms a strong bond with the surface to create a long-lasting matt finish that helps protect against the weather while still allowing moisture vapour to escape. Suitable for both internal and external use, it is a great choice where you want a reliable, hard-wearing finish that keeps façades looking fresh over time. It is also especially well suited to older and listed buildings where breathability is important.

Why Choose EWI-002 Silicate Paint?

Breathable finish that allows moisture vapour to escape.
Designed for mineral surfaces including lime-cement render, concrete and mineral plaster.
Suitable for use with external wall insulation systems.
Ideal for older and listed buildings where breathability matters.
Provides a durable, weatherproof finish for internal and external surfaces.
Resistant to UV rays, water and dirt, helping façades stay cleaner for longer.
Matt finish for a clean, modern appearance.
Ready to use for straightforward application on site.

Intended Uses

EWI-002 Silicate Paint is designed for use on mineral backgrounds such as lime-cement render, concrete and mineral plaster, and is also suitable for external wall insulation systems. Because it is highly breathable, it is particularly useful on buildings where moisture management is important, including older properties and heritage-style projects. It can be used internally or externally wherever a tough, attractive mineral paint finish is required.

Substrate Preparation

All surfaces should be clean, dry and stable before painting. Dust, dirt, oil, mould and algae should be removed, and any cracks or damaged areas repaired before application. Once prepared, the surface should be primed with EWI-333 Topcoat Primer to help control absorption and improve adhesion. Good preparation helps ensure a more even finish and better long-term performance.

Product Preparation

EWI-002 Silicate Paint is supplied ready to use and should not be diluted with water or mixed with other products. Stir well before application and check the colour before starting work.

Application

EWI-002 Silicate Paint can be applied by brush, roller or spray machine. For the best finish, apply evenly and continuously to avoid visible overlaps, and always use paint from the same batch on a single wall or elevation to maintain colour consistency. Leave at least 12 hours between coats.

Application Conditions

Apply when air and surface temperatures are between 5°C and 25°C. Avoid painting in direct sunlight, strong wind, rain or frost, as these conditions can affect the final finish and drying performance.

Technical Data

Technical Data	Value
Composition	Potassium water glass, titanium dioxide, mineral fillers, pigments, polymer dispersion, additives, water
Gloss level	Matt
Consumption	Approx. 0.225 l/m²
Density	Approx. 1.45 g/cm³
pH	Approx. 9
Water Vapour Permeability	1113.4 g/(m²·24hr)
VOC Content	0.81–1.32 g/l
Wet abrasion class	≥ 5000 cycles
SD-value	Approx. 0.031 m
Application and setting temperature	5°C to 25°C
Drying Time	12 hours at +20°C
Unit Quantity	5 or 15 Litre Bucket

Frequently Asked Questions

It is a highly breathable masonry paint designed for lime render, mineral render, concrete and external wall insulation systems.

Silicate paint and limewash are both breathable mineral finishes, but they are used slightly differently. Limewash is a traditional lime-based coating that creates a soft, natural, chalky finish and is ideal for heritage-style buildings. However, it generally needs more regular maintenance and reapplication. Silicate paint offers a similar breathable benefit but with improved durability, weather resistance and colour stability. Making it a better choice for homeowners who want a mineral finish with longer-lasting performance.

EWI-705 Lime Paint and EWI-002 Silicate Paint are both breathable mineral coatings, but they offer different benefits. Lime Paint is made from natural limestone and is ideal for a traditional, eco-friendly matt finish on heritage and breathable exterior surfaces. Silicate Paint chemically bonds to mineral substrates, creating a more durable, weather-resistant finish with long-lasting colour and façade protection.

It is designed for mineral surfaces such as lime-cement render, concrete and mineral plaster. It’s also suitable for use with external wall insulation systems. It’s ideal for use on older or listed buildings where breathability is essential.

Once the surface is ready EWI-333 Topcoat Primer should be applied to control absorption and improve adhesion. Windows, doors and any other areas not intended for painting should be protected before application begins.

Approx. 0.031 m, which indicates the material is highly vapour permeable.

When stored correctly, the product remains usable or up to 24 months from the date of manufacture.