Premium Basecoat (EWI-225)- 25kg – x40


£725.76 (incl VAT)

In stock

  • High strength
  • Dual-purpose
  • Breathable
  • Waterproof
  • Frost-resistant
  • High elasticity

This product is sold in pallets of 40 bags.


Premium Basecoat is breathable, high strength and durable. EWIPro’s finest basecoat adhesive, it is used for a range of solutions for example as a basecoat/adhesive for Mineral Wool, Kingspan K5 and Wood Fibre insulation boards or as a render-only solution onto a range of substrates including render carrier board. The adhesive is white due to the presence of white Portland cement – making it stronger than other basecoat adhesives (EWI-220 and EWI-210). Once the basecoat has dried it provides an incredibly strong and flexible reinforcement layer; we therefore highly recommend this product for ‘render only’ systems.

Premium Basecoat can be used for two purposes:

  • An adhesive used to create the reinforcement basecoat layer in render only or Mineral Wool, EPS, Kingspan K5 and Wood Fibre EWI systems
  • An adhesive used to fix Mineral Wool (Rockwool) to a substrate.

Premium Basecoat is prepared in the same way regardless of whether it is being used as a basecoat or an adhesive for fixing the Mineral Wool insulation boards to the substrate. The Premium Basecoat comes as a dry mix in 25kg so needs to be mixed with clean, cold water ( >5.9 litres) prior to use. We suggest filling a large bucket with the correct quantities of water prior to adding the dry basecoat mixture. Once the basecoat has been added to the water, it needs to be mixed using a paddle mix until an even consistency mortar is produced. Once the product has been mixed sufficiently, leave the bucket for 5-10 minutes and then remix using the paddle mix before the adhesive is ready for use.


If using the Premium Basecoat for the basecoat layer, apply the basecoat using a 10mm  notched trowel to the substrate. Then embed overlapping pieces of Fibreglass Mesh – the mesh should sit within the middle of the basecoat layer. Once embedded the basecoat layer should be 6mm in total.

If using the Premium Basecoat to fix insulation boards to the substrate, the product can either be applied to the whole surface of the insulation board using a notched trowel or applied to the perimeter of the insulation board with 3 dabs across the middle.

  • Primer: EWI-301 or EWI-310 if a key is required
  • Application temperature (air, substrate, materials): from +5°C to 25°C
  • Time of usability after mixing with water: approx. 2 hours (temp. +20°C)
  • Water mix proportions: approx. >5.9 litres of water per 25 kg of dry mix
  • Quantity to be used:
    • Fixing insulation panels of foamed polystyrene and reinforced layer on foamed polystyrene: approx. 4-5 kg/m2
    • Fixing insulation panels of Mineral Wool and reinforced layer on Mineral Wool: approx. 5-6 kg/m2


Comes in powder form in a 25kg paper bag. Store in a cool, dry place. Avoid ingress of water. Shelf life: up to 12 months from the date of manufacture.


  • Basecoat/Adhesive – 25kg/2.5m2
  • Render Only (Brick/block) – 25kg/2.5m2
  • Render Only (RCB) – 25kg/3-3.5m2
  • Render Only (Insulation) – 25kg/3-3.5m2


Weight 25 kg


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