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    New industry guidance for CDM project Principal Designers

    The Temporary Works Forum (TWf) has published new guidance on the role of the CDM 2015 Principal Designer with respect to temporary works see below.

    Businesses undertaking temporary works design are covered by the definition of ‘designer’ under CDM 2015. The business appointed Principal Designer (PD) must ensure that all other designers comply with their CDM 2015.

    The PD must also ensure cooperation between designers (both permanent and temporary works) and the PD role continues into the construction phase when design work is carried out.

    The TWf believes that many designers may be more familiar with permanent works design issues than temporary works. The new Information Sheet seeks to provide guidance which it hopes will prove useful to Principal Designers and the wider UK construction industry.



    HSE Explanation of what TW includes:

    Temporary works is a widely used expression in the construction industry for an “engineered solution” used to support or protect an existing structure or the permanent works during construction, or to support an item of plant or equipment, or the vertical sides or side-slopes of an excavation, or to provide access. The construction of most types of permanent works will require the use of some form of temporary works.

    Temporary works is defined in BS5975: 2008 “Code of practice for temporary works procedures and the permissible stress design of falsework” as “(those) parts of the works that allow or enable construction of, protect, support or provide access to, the permanent works and which might or might not remain in place at the completion of the works”.

    Examples of temporary works include, but are not limited to:

    Earthworks – trenches, excavations, temporary slopes and stockpiles. Structures – formwork, falsework, propping, façade retention, needling, shoring, edge protection, scaffolding, temporary bridges, site hoarding and signage, site fencing, cofferdams.

    Equipment/plant foundations – tower crane bases, supports, anchors and ties for construction hoists and mast climbing work platforms (MCWPs), groundworks to provide suitable locations for plant erection, e.g. mobile cranes and piling rigs. Further information on temporary works design principles and the consequences and causes of failure are set out in Appendix 1.”

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