Accuracy

Most bolt and connector trusses for domestic roof construction will be assembled using sawn timber. The tolerance on sawn timber in terms of over and under sizing, particularly in the larger dimension, is significant and for this reason the full size setting-out of the truss has been recommended in the assembly procedures described. The precise location for the bolt centres is essential to maintain the design edge and end distance for the timber connectors themselves. Insufficient end distance may result in a timber connector shearing out a section of timber thus allowing the truss joint to fail. Great care must therefore be taken to follow the precise dimensions detailed on the engineer's drawing. Reference should be made in this respect to the dimensions indicated on the design illustrated in Fig. 5.3.

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