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The following recommendations apply to roof trusses on standard domestic buildings where truss design details are obtained from MiTek engineering programs. ROOF TRUSS INSTALLATION GUIDE. SCOPE &. GENERAL. 1.1 GENERAL. Timber roof trusses are engineered and manufactured to an exacting standard which require 1.3.1 Layout. A roof truss layout must be obtained prior to erection, with the following points considered: a) Check dimensions of the supporting structure Most basic timber roof trusses timber dimensions are 90x35mm and start at strength grade MGP10 (old grading called F5). If the truss requires a bigger timber The Ulfimate Steel Building System wall frames and trusses by AusSteel are designed, engineered and manufactured in accordance with Australian Standards.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 The following details provide a guide for design proportions. Table 1. Steel Lintel Proportions. Laminated Timber Lintels. Type A : Laminated veneer lumber (LVL)