022 RCI 0717

RCI July 2017

RCI TECHNICAL NOTE NUMBER 246 Glazed Clay Roof Tiles to match existing or in ANYCOLOUR of your choice 1920s Houses 022 JULY 2017 RCIMAG.COM Part B2 also identifies a number of variations and special provisions, such as permitting parts of walls in rooms to have a poorer performance over limited areas, but no poorer than Class 3. A suspended ceiling can contribute to the overall fire resistance provided it meets additional provisions. Guidance on flexible membrane covering a structure and the use of PTFE based materials are given in other references. Thermoplastic materials Thermoplastic materials such as polycarbonate and PVC can be used for internal glazing, rooflights and lighting diffusers provided that they meet a TP(a) rigid or TP(b) classification based on an alternative test method. Restrictions on the size and layout of rooflights are set out in detail in a separate table and diagrams. Thermoplastic rooflights and lighting diffusers should not be installed above protected stairways. Conclusion The first set of Building Regulations was published in their current form in 1965. Over the past fifty years they have been amended and updated, introducing variations and special provisions with multiple test methods. Many of the requirements of Part B are closely interlinked. This presents a complex document open to misinterpretation and which is now under national review. This introduction is no more than a summary of principal issues. Readers should refer to Approved Document B for the details. Future RCI Technical Notes in the August and September issues of RCI will look at Parts B3 and B4. “The first set of Building Regulations was published in their current form in 1965. Over the past fifty years they have been amended and updated, introducing variations and special provisions with multiple test methods. Many of the requirements of Part B are closely interlinked. This presents a complex document open to misinterpretation and which is now under national review” References 1. Approved Document B ‘Fire Safety’, 2006 edition incorporating 2007, 2010 and 2013 amendments, Volume 1: Dwellinghouses (82 pages), Volume 2: Buildings other than dwellinghouses (170 pages), available at www.gov.uk/government/publications/fire-safety-approved-document-B 2. BS 476 – 6:1989 ‘Fire tests on building materials and structures. Method of test for fire propagation for products.’ 3. BS 476 – 7: 1997 ‘Fire tests on building materials and structures. Method of test to determine the classification of the surface spread of flame of products.’ Keith Roberts, who compiled this Technical Note exclusively for RCI, is an independent roofing consultant. Contact him at: Roberts Consulting 2 Gardiner Close, Abingdon, Oxon, OX14 3YA Tel/fax: 01235 529 693 www.robertsconsulting.co.uk During the 1920s coloured glazed roofs became fashionable with architects and house builders and many fine examples still exist in select areas throughout the British Isles. We are able to match the original tiles and colours as closely as possible and with improved manufacturing methods, refined clays and environmentally conforming glazes, offer a new lease of life to these classic buildings. We offer tile models and colour glazes to match amongst others "Sterreberg", "Courtrai", "Pottelberg", "D&G", and "Bridgwater" Double and Single Roman. Smithbrook Building Products Ltd, PO Box 2133, Shoreham-by-Sea, BN43 9BD Tel: 01273 573811 Fax: 01273 689021 Email: info@smithbrookproducts.com www.smithbrookproducts.com


RCI July 2017
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