Overview
This project involved treating persistent mould and condensation around a bay window in a 1930s detached property. The homeowner had ongoing issues with damp patches and black mould forming during colder months, particularly around the curved bay area. This is a common problem in properties of this age and often linked to colder wall surfaces and poor airflow.
The Problem
Our survey identified that the bay window was suffering from cold surface temperatures that encouraged moisture to condense on the walls. In addition, the original timber floor with subfloor ventilation allowed draughts to pass through gaps between the floorboards and the wall. These draughts created isolated cold spots, causing the surface temperature to fall below dew point. As a result, condensation formed regularly and provided conditions for mould growth.
Our Solution
To correct the temperature imbalance, we installed Isotherm, an effective insulating system used to raise the surface temperature of internal walls. Isotherm typically increases wall temperature by up to nine degrees, significantly reducing the likelihood of condensation forming. When combined with improved ventilation, this keeps the surface temperature above dew point and prevents moisture from settling.
We also sealed the gap between the floorboards and the wall using polyurethane foam. This removed the cold draughts that had been contributing to the problem. Polyurethane foam offers a robust and water-resistant solution for this type of preservation work and helps stabilise the temperature of the affected area.
The Result
The bay window area is now warmer, dry and completely free from mould. By increasing the surface temperature and eliminating draught-related cold spots, the condensation problem has been fully resolved. The homeowner now benefits from a cleaner, healthier and more comfortable living environment.
Need Help with a Similar Problem?
If you are experiencing mould or condensation issues in cold spots such as bay windows, our specialists can help. Visit our Condensation Control page or get in touch to arrange a professional assessment.
