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April RIBA CPD 04

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Event Title: Kalzip
Event Type: CPD Seminar
Date: Friday 26th April 2019
Time: 13:00 - 14:00
Venue: 38 Carrington Street
£0.00 GBP
Eventbrite Link:
Click Here

CPD Main Points:
• To understand the principles of weather tightness
• To understand the classifications of curtain wall
• To gain an overview of curtain wall testing regimes
• The Products
• The Projects


This CPD discusses the use of aluminium standing seam roof and wall cladding systems. The original “unhole-y roof” concept was developed in the US in the 1960s, inspired by the efficiency and flexibility of the zips used to fasten clothing. Unperforated sheets of metal were profiled with one small roll standing seam and one large roll standing seam, and secured by placing the sheets over halter clips, with the large roll of one sheet overlapping the small roll of the adjacent sheet. They were then sealed firmly together using a “zipping” machine to close the large roll of the standing seam tightly over the small roll, leaving a secure standing seam. Roll-formed standing seam roofing was first introduced to Europe in 1968, with the opening of a factory in Stuttgart. Today, the concept has evolved and it is possible to achieve complex shapes and geometries, and to use standing seam systems for a range of building roofs and walls.

The key to a standing seam roof is the use of a continuous unpenetrated top sheet, made of a durable material. Sheets are “zipped” over the halter clips. The zipping process means there are no fasteners penetrating through the aluminium sheets allowing huge areas of roof to benefit from a continuous and robust impermeable covering.

For most buildings, some penetrations will be required in the roof or walls to allow for elements such as access hatches, vent pipes, louvres and rooflights. Where these must be located mid sheet, it is recommended that the detail is welded, to ensure that the sheet remains impervious.

The metal sheets are held in place with halter clips, which provide the load path to the structure. They can also move in relation to it, accommodating thermal expansion and contraction in the metal sheets. Movement is controlled by the inclusion of a single fixed point, which must be correctly calculated and engineered to counteract considerable in-plane forces caused by longer sheet lengths. Factors to consider include sheet length, pitch, material gauge, snow load and even the colour of the sheet. A fixed-point calculation should be provided for every project. It is imperative that a second fixed point is not introduced. 

This is a generic detail for all standing seam systems. The fixed point calculation is not specifically mentioned in British Standards but is covered in MCRMA Technical Paper No.3, Secret Fix Roofing Design Guide, published by the Metal Cladding and Roofing Manufacturers Association.

All attendees will receive a certificate of attendance, and CPD literature. Discover up-to-the-minute information about ergonomics and assistive technology products, ask questions to ensure that your organisation is offering the most appropriate product solutions to your students or employees.

For more information on the event, visit their website.
For more information about us and our monthly RIBA CPD seminars, please visit Architecture North website.