SYSTEMS
OPTION 3 Through-wall plus façade
SYSTEM TYPES Through-wall is a relatively new term used to describe a system approach to external wall systems using light gauge steel framing, plasterboard, sheathing boards and breather membranes, and may include AVCL membranes as necessary. SFS light gauge steel framing systems provide the structural framework for the inner skin of external walls. An SFS/system supplier’s definition will be subject to the scope of their supply. For the purposes of this guide, through-wall is defined using the following three approaches: Option 1 From the inner plasterboard lining to the sheathing board Option 2 Includes the insulation on the face of the sheathing board Option 3 Includes the façade system. Note: in relevant buildings, work will be carried out so that materials that become part of an external wall, or specified attachment, of a relevant building are of European Classification A2-s1, d0 or Class A1, classified in accordance with BS EN 13501- 1:2007+A1:2009 – Fire classification of construction products and building elements. EVIDENCE OF PERFORMANCE AND RESPONSIBILITY System owners offering the options listed above carry out extensive testing in order to provide evidence of performance. Where a designer selects an option 1 system, they become responsible for the addition of external insulation, AVCL and the façade system working together. Where a designer selects an option 2 system, they become responsible for the addition of the façade system working together. Option 3 will have performance evidence of all the performance elements working together, which can be used to demonstrate compliance.
OPTION 2 Through-wall including insulation
OPTION 1 Through-wall
AVCL
Breather membrane
Through-wall including external insulation and façade.
Image: encon.co.uk/kingspan-k- roc-rainscreen-slab!pd-73-4762
SPECIFICATION The most common methods used by designers for the selection and specification of through-wall systems are noted below. Collaboration and communication are key to a compliant specification. It should be noted that any changes made to the specification at any stage will turn whoever makes those changes into the designer. Points to considerwhen writing a specification: • Talk to the manufacturer • Performance is king (fire, acoustics etc) • Consider the interface with other elements • Understand the use, now and in the future • Understand the budget • Understand the programme and site conditions • Understand the vision and client aspiration • Ensure that the performance and workmanship requirements and standards are clearly included • Understand the implications of maintenance • Understand the environmental implications and what will happen at end of life • Do not be scared of specifying new products.
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