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.

Mineral Wool Reinforcement Collar - 90mm

Brand: Wkret-Met

SKU: WKR-TDX-90

Pack of 100 Collars

£24.66 Incl. VAT

£24.66 Incl. VAT (regular price)

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

Quantity:

The Mineral Wool Reinforcement Collar – 90mm is a fibreglass-reinforced polymer spreader plate designed to support mechanical fixings when installing mineral wool insulation boards, including lamella. Used in combination with EWI fixings, it increases the contact area and improves pull-through resistance, ensuring stable and long-lasting installation under wind loads.

Suitable Insulation Boards

Insulation Type	Compatibility
Mineral Wool	Compatible
Mineral Wool Lamella	Compatible
EPS / XPS / PIR / Wood Fibre	Not required / not recommended

Compatible Fixings

Fixing Type	Compatibility
Hammer Fixings	Compatible
Screw Fixings	Compatible

Used as a supplementary disc with EWI mechanical fixings to improve load distribution on mineral wool systems.

Key Features

Fibreglass-reinforced polymer for durability and strength.
Improves load distribution and pull-through resistance.
Essential for mineral wool lamella and slab systems.
Compatible with both hammer-in and screw-in fixings.
Lightweight, impact-resistant, and easy to install.
Supports high wind-load performance in ETICS applications.

Sizes & Box Quantities

Size	Box Quantity
90mm diameter	100 per box

Application

Preparation

Ensure mineral wool boards are properly bedded and adhesive has been applied as specified.
Select suitable mechanical fixings for the substrate.

Installation steps

Place the collar over the fixing point on the insulation surface.
Insert the chosen fixing through the centre of the collar.
Drive the fixing into the substrate until the collar sits flush.
Continue fixing to specified density, increasing fixing count in high-suction areas.

Quality checks

Ensure collars sit flat and are not dished or distorted.
Confirm secure fixing hold without crushing insulation.

Frequently Asked Questions

It increases the contact area around the fixing to improve pull through resistance and keeps mineral wool boards secure under wind load. It is especially useful for lamella and slab systems.

Use it with mineral wool insulation, particularly lamella and slab boards. It is not required for EPS, XPS, PIR or wood fibre.

It works with hammer in fixings and screw in fixings.

Use it only with mineral wool systems. It is not recommended for EPS, XPS, PIR or wood fibre.

Lamella boards have vertically aligned fibres, so they are more flexible. The collar spreads the load and helps prevent the fixing head from pulling through under wind pressure.

Place the collar over the fixing point, insert the fixing through the centre, then drive the fixing into the substrate until the collar sits flush with the surface.

Not if installed correctly. Make sure they sit flat and flush without distortion and avoid overtightening.

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Mineral Wool Reinforcement Collar - 90mm

SKU: WKR-TDX-90

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Mineral Wool Reinforcement Collar - 90mm

Suitable Insulation Boards

Compatible Fixings

Key Features

Sizes & Box Quantities