Technical Knowledge Base — EWI & Render Guides
Recent Articles
Free External Wall Insulation Grants in the UK: A 2026 Eligibility Guide
The Complete Guide to External Wall Insulation Systems
Fire Safety in EWI Systems: Materials, Testing, and Compliance
Condensation and Interstitial Moisture in EWI Systems
All Articles
(18)Free External Wall Insulation Grants in the UK: A 2026 Eligibility Guide
How free external wall insulation funding works in the UK: the main 2026 grant schemes, benefit and EPC-based eligibility rules, and how to check your own home's options.
The Complete Guide to External Wall Insulation Systems
How external wall insulation systems work, layer by layer: EPS, mineral wool, wood fibre and phenolic boards compared, render finishes, and how to match the right build-up to your home.
Fire Safety in EWI Systems: Materials, Testing, and Compliance
How external wall insulation is fire-rated in the UK: Euroclass classifications, BS 8414 facade testing, building height thresholds, and why A1-rated mineral wool systems lead modern specifications.
Condensation and Interstitial Moisture in EWI Systems
Condensation is the most misunderstood damp problem in UK homes. Learn how dew point physics, breathable EWI systems and proper ventilation keep insulated walls dry inside and out.
What Happens During an EWI Survey? A Homeowner's Step-by-Step Guide
A plain-English walkthrough of what a free EWI survey covers — wall construction, damp checks, measurements and access — and how the findings turn a budget estimate into a fixed quote.
EWI Pro Silicone Renders: Choosing the Right Finish for Your Home
APEX EWI explains the four EWI Pro silicone renders we install — EWI-040, 075, 076 and 077 — and which finish, grain size and colour suits your property.