Retrofit assessment

Risks from the retrofit

One of the main requirements of the PAS 2035 retrofit process is a risk assessment of the works to be carried out before they start. This risk assessment determines the way the project is run (known as the Pathway). The three pathways are as follows
Path A: The simplest of retrofit projects, topping up loft insulation for example. These require
Path B: Medium risk projects, where there are multiple measures being installed, they are riskier and/or the building itself is older or has particular problems.
Path C: High risk projects, where there are multiple properties, they are high rise or other risks.
For each path there are sets of increasingly complex requirements to ensure your project runs smoothly. Further details can be found in this document
Whilst it may seem initially that retrofit projects are relatively low risk there are a number of things that can go wrong. Your house was designed to operate in a certain way, older houses had open fires and plenty of air circulating to feed them this means relatively few damp problems . Retrofitting a house typically involves removing these draughts and making the house more airtight which means moisture is retained within the house and needs to be managed correctly.
Alongside this there are other risks such as fire, poor installation or changes to historical features.
Finally there is the possibility that different improvement measures will conflict with each other and reduce effectiveness or create problems. This is shown in the matrix at the end.
Using the analysis this project is assessed as the following grade:
Overall risk grade
0
Criterion
Grade
1
Highest assessed grade
B
There are no rows in this table
1
Count
Number of measures per dwelling
0
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Criterion
Options
Grade
1
The average number of measures per dewlling
1-2
A
There are no rows in this table
1
Count
Number of dwellings in the project
0
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Criterion
Options
Grade
1
The number of dwellings to be improved
1-10
A
2
There are no rows in this table
1
Count
Measures proposed
0
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Criterion
Options
Grade
1
The inherent technical risk of the highest risk measure from the risk table
2
B
There are no rows in this table
1
Count
Combination of measures
0
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Criterion
Options
Grade
1
The highest risk combination of measures excluding ventilation
Orange
B
There are no rows in this table
1
Count
Construction and Built Form
0
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Criterion
Options
Grade
1
Construction and built form of buildings
Traditional not protected B
B
There are no rows in this table
1
Count

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