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Which Insulation Adhesive Do I Use?

There are several rules to follow when installing external wall insulation, one of which is to always use the correct insulation adhesive. At EWI Store we offer a range of EWI Pro insulation adhesives, all of which are designed for use with different insulation boards.

In today’s post we are going to be talking you through the different insulation adhesives within the range, including which ones should be used for which insulation material.

EWI-220 EPS Basecoat Adhesive

As the name suggests, this type of insulation adhesive is designed for use with our EPS insulation, but it can also be used for XPS. Because EPS is such a lightweight insulation board, it does not require as much of a heavy-duty adhesive as other materials.

The EWI-220 creates a strong, long-lasting adhesion, securing the boards to the substrate for years to come. It can also be used within the basecoat reinforcement layer, whereby a Fibreglass Mesh is embedded within the adhesive. The purpose of this is to create a smooth, strong surface ready for the render to be applied to. 

EWI-225 Premium Basecoat

The Premium Basecoat is our strongest adhesive, designed for securing Mineral Wool, Wood Fibre and Kingspan K5 insulation boards to substrates. This particular adhesive contains portland cement and fibres which create a highly adhesive material, able to support the weight of these heavier insulation boards.

Much like the EWI-220, this insulation adhesive can also be used within the basecoat reinforcement layer. Because the product is so strong, it’s also ideal for use in the basecoat layer for render-only systems.

  • EPS Basecoat
    Quick View

    EPS Basecoat Adhesive (EWI-220) – 25kg

    £12.52 Excl. VAT

EWI-221 Winter Adhesive

If you’re installing EWI during the winter months, then you may want to consider using our EWI-221 Winter Adhesive. This insulation adhesive can be used for EPS and XPS, at temperatures even down to zero degrees.

  • EWI-221 Winter adhesive
    Quick View

    Winter Adhesive (EWI-221) – 25kg

    £14.66 Excl. VAT

Filling Gaps Between Insulation Boards

If you’re installing external wall insulation, you may find that you end up with small gaps between the insulation boards. The best way to sort this is by either using insulation offcuts, which is probably ideal for larger gaps or by using a spray foam adhesive.

Gaps between boards should never be filled using adhesives. This is because spray foam adhesives are best for preventing thermal bridging, as they have a low thermal conductivity – insulation adhesives will just let all the heat escape through the gaps and cracks.


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