Published November 20, 2025 | Version v1
Journal article Open

Post-Retrofit Moisture Risk in Solid-Wall Buildings: A Case-Based Study of Birmingham Homes

Authors/Creators

  • 1. Retrofit Academy | DMU (De Montfort University) | CIOB (TechCIOB) | CABE

Description

This technical report explores the challenges and risks associated with retrofitting solid-wall dwellings in the UK, focusing particularly on moisture-related failures. Drawing on field case studies from Birmingham (Handsworth, Edgbaston, Smethwick), it examines real-world detailing issues, including thermal bridging, interstitial condensation, and vapour control. The article discusses best practice approaches aligned with PAS 2035 and highlights the importance of hygrothermal modelling (e.g. WUFI), RH sensor monitoring, and post-retrofit evaluation. Designed for retrofit professionals, building scientists, students, and policy-makers, this report offers evidence-based insights for safer and more resilient retrofit delivery.

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moisture-risk-retrofitting-solid-wall-homes-uk-hamed-esmaeili.docx 5.pdf

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Additional details

Dates

Issued
2025-11-20
This technical report investigates post-retrofit moisture risks in traditional solid-wall homes across Birmingham, UK. Drawing from real-world case studies and building performance data, it explores the impact of poor detailing, vapour control, and thermal bridging in Internal and External Wall Insulation (IWI/EWI) retrofits. The report also provides industry recommendations in line with PAS 2035 and BSI Moisture Guidance. Authored by Hamed Esmaeili, the document contributes to the growing field of moisture-aware retrofit design for Net Zero housing.