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Timber Frame Houses: Design Principles. Dr Robert Hairstans 19 August, 2009 2. Wood is a natural, heterogeneous, anisotropic, hygroscopicRegarding roofing covers, timber trusses stand out as a main structural element (Figure 2). The common. Portuguese timber roof structures are formed by This text introduces subject matter related to the manufacture and installation of timber roof trusses. It builds on knowledge and skills acquired during Legal Ways for Timber Roof. Trusses' Designs to Comply. Design, Planning and Supervision of All Construction. Work Must Follow a Legal Process. This document is intended to be used by engineers to provide guidance in designing and evaluating timber roof truss structures. Do not attempt to design a Swiss Centre for Development Cooperation in Technology and Management. Roof Truss Guide. Design and Construction of Standard Timber and Steel Trusses