Existing built asset risk potential

Why pre-assessing the building condition is a must before retrofitting?  

When planning a thermal retrofit of a building, it is essential to assess a range of existing damages or conditions that could compromise the effectiveness, safety, or cost-efficiency of the retrofit.

A breakdown of key areas to evaluate (not limited to) is given in Table 1 below. 

Thermal retrofitting often involves sealing up the building envelope, adding insulation, and upgrading systems to improve energy efficiency. However, if the building has underlying issues – such as structural weaknesses, moisture ingress, outdated wiring, or hazardous materials – these can be exacerbated by the retrofit process.  

Structurally compromised materials

In some cases, the underlying issues can render a retrofit ineffective or dangerous. For example, if a building contains RAAC planks or other structurally compromised materials, adding new loads without reinforcing these elements could lead to failure.

Moisture problems

Similarly, if moisture problems like rising damp or leaks exist behind newly installed insulation, this can create ideal conditions for mould growth, rot, corrosion, and long-term damage to the building fabric. 

Fire safety

Fire safety is another critical concern. Retrofitting can unintentionally block escape routes or enclose outdated electrical systems that are already under strain. Without proper assessment, this could increase the risk of fire or make evacuation more difficult in an emergency. 

Legal and regulatory dimensions

There are also legal and regulatory dimensions to consider. Building codes evolve, and retrofitting may trigger requirements to bring other parts of the building up to current standards. Ignoring these can lead to compliance issues, fines, or the need for costly rework. 

Building assessment list for thermal retrofitting

Table 1 captures potential risks or damages grouped into nine topic areas. It provides a high-level description, risks explanation, identification and characterisation, risk evaluation, potential consequences, potential mitigation strategies, and useful links.   

Table 1: Existing building risk asset potential