Agricultural engineering

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Low-cost high-quality roof construction with round timber.
(University of Zambia, 2020-05-03) Lusambo, Edward
Pole timbers provide an inexpensive source of structural timber in many developing countries and are widely used for traditional buildings. The use of round timber has considerable potential in comparison to the use of sawn timber because of its higher structural strength and its low material cost. There are, however, problems associated with working with non-uniform sections and also with jointing. The traditional methods ofjointing using sisal rope or strips of bark in rural areas do not permit the full strength of the poles to be utilised. Improved low cost methods of connecting poles could lead to stronger structures and more economical use of materials. This paper reviews aspects relating to the use of round timber and describes the design and fabrication of some low-cost, yet high-quality structural systems suitable for roof structures of modern buildings. Keywords: Round timber, Roof structures, Connections, Jointing methods