How to manage temporary works in construction - Book - Page 115
5.2 Implementation risk classification
Implementation risk
5.2.1
BS 5975-1:2024 clause 5.1.3 states that in addition to Execution Risks, risks associated with
temporary works can also arise from where the structure is located.
Consider the consequence of failure for the open steel-mesh fencing show below. They are
the same structure with subtle differences in how they are installed, where they are
located, and the risk each one presents.
Adjacent to public highway with higher
person interface, therefore higher risk
Built inside site with lower person interface,
therefore lower risk
Implementation risk classification
5.2.2
BS 5975-1:2024 clause 5.1.3.1 states that each organization should determine the control
required dependent upon the implementation risk classification with reference to Table 1.
5.2.3
BS 5975-1:2024 clause 5.1.3.3 states that the PC’s TWC should confirm the implementation risk
classification where there is an interface between contractors.
5.2.4
The following table gives examples of temporary structures, and their associated implementation
risk classification based upon location related to Table 1. The structures shown are for illustration
purposes only.
Example of a structure in situ
Risk
level
Risk
description
Who can issue
the permit?
TWS
TWC
PC
TWC
How
frequently
should the
structure be
inspected?
After
Very low
No identified
practical mode
of failure
No impact if
failure occurs
A permit may not be
required as works
can be controlled via
RAMS
Matting Cat 0*
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installation
Before first
use
Intervals not
exceeding 7days
115
