ABSTRACT
Another suggestion from the literature (Walker et al. 2005) is that embedded bolts attaching roofs should be buried to a depth of 600 mm. It is suggested that ties should be inserted at least 150 mm into the wall with a clearance of 150 mm from the edge. Lindsay (2012) provides similar advice in an Australian context. Houben & Guillard’s (1994) famous book also contains guidance on fixings but lacks specifics in terms of dimensions. Interestingly, they advise anchoring roofs using continuous ties as opposed to using isolated supports. In many cases it appears that guidance derives from personal experience and tradition (as is the case with much structural design advice using RE) and therefore probably includes large (& hidden) safety factors which result in potentially uneconomical solutions.
