Lightweight Basecoat (EWI-269) – 25kg x 40


£586.56 (incl VAT)

In stock

EWI-269 Lightweight Basecoat is designed to be used internally or externally and can be applied on on high-performance blockwork, lightweight masonry structures and stonework. The Lightweight Basecoat is suitable for machine application to substrates, and can also be applied up to 25mm in one pass. The basecoat is heritage friendly due to its lime content, which makes it lightweight and flexible.

  • Available in 25kg bags
  • Contains Lime & Perlite
  • Air content is approx. 29%
  • Compressive strength category – CSII

EWI-269 Lightweight Basecoat

EWI-269 Lightweight basecoat is a breathable, heritage friendly basecoat. Once dry, the basecoat provides a strong, flexible and waterproof layer. The Lightweight Basecoat can be applied internally or externally on the following substrates:

  • Ziegel Blockwork e.g. Porotherm, Thermoplan, Juwo blocks & Poroton Block;
  • Autoclaved aerated concrete blocks e.g. Ytong;
  • Calcium Silicate blocks;
  • Stone e.g. Sandstone, limestone and natural stone;
  • Solid brick walls


The Lightweight Basecoat comes as a dry mix in 25kg bags. The bag needs to be mixed with 5 litres of clean potable water using an electric paddle mix. It is recommended the basecoat is mixed for 2-3 minutes to achieve the required consistency. The Lightweight Basecoat is then ready for use. When hardened, the Lightweight Basecoat should not be remixed with fresh material.


The basecoat should be applied to the substrate using a plastering trowel or spray machine. The basecoat can be applied in either a single pass or multiple layers depending on the finish required. The maximum recommended depth of a single pass of the Lightweight Basecoat is 25mm.

Application conditions

  • Substrate primer: EWI- 301 or EWI-310 if a key is required.
  • Application temperature (air, substrate, materials): from +5°C to +25°C
  • Water mix proportions: approx. 5 litres of water per 25 kg of dry mix
  • Time of usability after mixing with water: approx. 2 hours (temp. +20°C)
  • Quantity to be used: approx. 4-5 kg/m2

Technical Specifications

  • Composition: Portland cement, hydrated lime, mineral fillers (including perlite), admixtures
  • Density once set: Approx 1.2 g/m3 class LW1
  • Density of fresh mortar: Approx 1.5 g/m3
  • Air content: Approx 29%
  • Compressive Strength after 28 days: CSII
  • Thermal conductivity coefficient (λ) (tabular value):
    • 0.47 W/m*K
  • Water vapour diffusion factor: 7.8
  • Reaction to fire: A1
  • Grain size distribution: up to 1.25mm
  • Adhesion to substrate and symbol of cracking model:
    ≥ 0.4 MPa; FP: B
  • Capillary water absorption: category W0

Storage conditions

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.

SKU: EWI-269-1
Weight 25 kg


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