Insulating Cork Render (EWI-745)

Brand: EWI Pro

SKU: EWI-745-10

£39.98 Incl. VAT

£39.98 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:

Insulating Cork Render (EWI-745)

Name: Insulating Cork Render (EWI-745)
Brand: EWI Pro
SKU: EWI-745-10
Price: 39.98 GBP
Availability: InStock

EWI-745 Lime and Cork Thermal Insulation Mortar is a sprayable coating mortar for the thermal insulation of both horizontal and vertical elements. Its spray machine compatibility lends itself to uniquely shaped architectural construction.

Intended Uses

Ceramics, thermo-clay, bricks, lime mortars, concrete blocks. It is not recommended for use on OSB panels. Rigid insulation systems are recommended for thicknesses greater than 8 cm. It is suitable for interior and exterior applications.

Substrate Preparation

Substrates must be solid, dry, and clean of any previous plaster, microorganisms, gypsum, cement, or other material that could prevent optimum adhesion. Dampen the substrate before application to ensure good adhesion and proper curing. This will also prevent dehydration and consequent cracking. For older substrates, it is recommended that a levelling parge coat is applied for uniformity.

Product Preparation

EWI-745 Lime and Cork Thermal Insulation Mortar comes as a 10kg dry mix. Mix 4.5L of water with the bag’s contents and continue mixing for 3-5 minutes until the mixture is homogeneous. For larger volumes of material, use an electric mixer on a lower speed. The usability after mixing is 60 minutes.

Application

Sprayed mortar: The mixed mortar should be spread evenly over the entire surface to be covered in layers of 1 to 3 cm thick. For thicknesses greater than 3 cm, apply the mortar in two or more layers, preferably before the previous one hardens. Trowel-applied mortar: It is recommended that the mixed mortar be spread evenly over the entire surface to be covered in layers with a maximum thickness of 1 to 1.5 cm. For thicknesses greater than 1.5 cm, apply the mortar in two or more layers, preferably before the previous one hardens.

Storage Conditions

This product comes in powder form in a 10kg paper bag. Use the product within one year of its manufacture. Store in its original, tightly sealed packaging in a cool place protected from rain. It is recommended that the entire bag be used once opened.

Frequently Asked Questions

EWI-745 Lime and Cork Thermal Insulation Mortar is a sprayable insulating render designed for both internal and external use. It combines natural hydraulic lime (NHL5) with cork granules to create a breathable, sustainable, and highly efficient thermal insulation layer.

The natural composition allows moisture to escape while improving thermal comfort, making it ideal for traditional and eco-friendly buildings. Its sprayable consistency also makes it perfect for irregular or curved surfaces where rigid insulation boards cannot be used.

EWI-745 can be applied to:

Ceramic blocks
Thermo-clay
Brick
Lime mortars
Concrete blocks

It is suitable for both interior and exterior applications but not recommended for OSB panels. For insulation thicknesses over 80mm, we recommend using a rigid insulation system such as EPS or Mineral Wool boards.

You can apply EWI-745 either by spray machine or trowel.

Spray application: Apply in layers of 10-40mm per pass. For thicker insulation, build up in two or more layers before the previous one has fully set.
Trowel application: Apply evenly in layers up to 15mm. For thicknesses beyond this, apply multiple coats before the previous one hardens.
Once applied, float the surface for an even, consistent finish.

Yes, EWI-745 forms the base insulation layer in a complete lime render system. To build a full breathable system:

Base Layer: Apply EWI-745 Lime and Cork Thermal Insulation Mortar to the substrate.
Reinforcement Layer: Use EWI-748 Lime Basecoat NHL 5 as a basecoat over the cork layer to regulate and strengthen the surface.
Mesh Reinforcement: Embed orange fibreglass mesh within the basecoat, particularly around openings and impact-prone areas.
Finishing Layer: Apply EWI-705 Lime Paint or EWI-707 Lime Wash for breathable, decorative protection.

For a smoother internal finish, you can also use EWI-749 Lime Plaster before applying a lime paint or wash.

Yes, EWI-745 is suitable for external façades as well as internal walls. Its natural lime and cork formulation ensures excellent weather resistance while maintaining breathability. For added protection and decorative appeal, finish with EWI-705 Lime Paint or EWI-707 Lime Wash.

Ensure the substrate is:

Solid, dry, and clean
Free from plaster, oil, dust, and microorganisms
Damped lightly (not saturated) before application to ensure good adhesion and prevent cracking

For uneven or older walls, apply a levelling parge coat for a uniform surface before spraying or trowelling.

Mix 4.5L of clean water with each 10kg bag of dry mix
Combine for 3-5 minutes until smooth and lump-free
The mixed mortar remains workable for 60 minutes

For larger quantities, use an electric mixer on a low speed

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