Lengths of ties in cavity walls
In December Mr J. B. Olorenshaw aired difficulties over the satisfactory use of ties, including the problem of ensuring adequate lengths of embedment. We are grateful to Dr. C. Anderson who now brings to our notice the relevant guidance from BSI:
Mr Olorenshaw raises some important practical issues, but I am very concerned that he, and presumably you, are not aware that a BSI committee recently applied itself to producing a replacement for BS 1243 in the form of a performance standard. At the end of 1986 BSI published DD 140: Part l which deals with test methods for wall ties for masonry/masonry and masonry/timber construction and, early in 1987, Part 2 which deals with the use of wall ties.