EWI-225 Premium Basecoat

Product Overview

EWI-225 Premium Basecoat is the strongest and most flexible basecoat within the EWI Pro range, designed to deliver exceptional performance across both render-only and external wall insulation systems. In render-only applications, it forms a highly stable and durable base layer. Within EWI systems, its reinforcing fibres activate during mixing and application to securely bond all insulation types, including EPS, Kingspan K5, Mineral Wool and Wood Fibre boards, to the substrate. Once cured, the basecoat delivers outstanding strength and flexibility, supporting long-term system durability.

Intended Uses

EWI-225 Premium Basecoat is used for fixing insulation boards to suitable substrates and as a reinforcement layer within external wall insulation systems. It is compatible with all common EWI insulation types, including EPS, Kingspan K5, Mineral Wool and Wood Fibre boards, and is particularly advantageous where increased strength is required for heavier insulation materials. The product is also recommended for use in render-only systems, where it provides an exceptionally strong and flexible basecoat layer to support long-term durability of the finished façade.

BASECOAT
& ADHESIVE

SPRAY OR
HAND APPLIED

FLEXIBLE

VAPOUR-
PERMEABLE

Data Sheets

Product Data Sheet

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Safety Data Sheet

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Install Video Guide

Application Conditions

The basecoat should not be applied in rain or humid conditions, or where wet weather is expected before the material has set. Application should take place in temperate weather and must not be carried out in temperatures above 30 °C. Work should be postponed if the substrate or materials are frozen, or where there is a risk of frost within the first 24 hours after application. Typical setting time is between 24 and 48 hours, depending on environmental conditions and humidity. The product should be mixed with approximately 5.9 litres of clean water per 25 kg bag of dry mix.