CMA PUBLISHES UPDATED CONCRETE ROOF TILE “BIBLE”:
Article Date: 29 June 2007
Hard on the heals of its “Step-By-Step Roofing Guide”, the Concrete Manufacturers Association (CMA) has re-issued an updated version of its technical manual on the design and construction of concrete tiled roofs. First issued in 1999, the manual has been compiled in compliance with the National Building Regulations and SANS 10062-2003 (Fixing of concrete interlocking roofing tiles) and offers architects, builders and roofing contractors technical guidance and practical information.
CMA director, John Cairns, notes that good roofing practice necessitates correct design and detailing, good quality materials and proper installation procedures. “Adhering to these steps will ensure roofs which are aesthetically pleasing and which provide years of maintenance-free service,” he says.
Comprising over 120 pages, the manual leaves nothing to chance and covers all aspects of constructing a concrete tiled roof from the storage of timber and erection of trusses, to detailing work prior to completion. For those unsure about terms such as cleat, hip, and head lap, a page is devoted to roofing nomenclature, each name or phrase being clearly defined.
Technical data such as estimating costs, the preparation of tender specifications and bill of quantities are well covered in Section 2 as are roof pitch, wind forces and undertile membranes.
Cairns says undertile membranes are considered a very important part of a concrete tiled roof as they provide highly effective barriers against wind-driven rain and dust, and several pages in Sections 2 and 4 are devoted to their proper installation.
Section 3, which covers tiling procedure, explains the inspection process before tiling, the setting out and stacking of tiles prior to laying. The section also covers considerable detail on tile laying, eaves, valleys, ridges, hips and verges.
Detailing, which is dealt with in Section 4 and covers items such as condensation and ventilation among others, is also available on CD in various CAD formats. These can be placed directly onto drawings as is or modified to suit specific requirements.
Twenty eight different types of roofing applications are displayed and a range of tile profiles and tile fittings which are readily obtainable on the local market are showcased under Section 1. Section 5 deals with matters such as timber specification and treatment, wind forces and the erection of trusses.
The manual can be downloaded from the website www.cma.org.za. Alternatively it is available in hard copy format from the CMA. Copies of the CAD CD are also obtainable from the CMA. Call Pam on 011 805 6742 or email main.cma@gmail.com .
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