Attachment 4 - Site Investigation and Slab Report

                                                                           7.1.3 Wall Ties
                       Face of lintel may                                  To provide support for wall panels at articulation
                       be sealed
                                                                           joints, the BCA requires wall ties to be provided
                                                                           on each side of the joint and spaced horizontally
                                                                           no more than 300 mm from the joint. The vertical
                                                                           spacing of wall ties at articulation joints must also
                                                                           be halved, effectively doubling the number of ties
                                                                           at these locations. In order to suit brick or block
                                                                           courses, the vertical spacing could vary from 200 to
                                                                           400 mm but should average the required 300-mm
                                                                           spacing (ie half of the normal 600-mm vertical
                                                                           spacing).
                                                                               For cavity and unreinforced single-leaf masonry
                                                                           walls, lateral support across the joint (to carry
                                                                           horizontal loads and to maintain alignment) should
                                                                           be provided. To achieve this, and also to allow the
                                                                           joint to open and close, masonry expansion (sliding/
                  Figure 22 Bed joint along lintel may also require        extendable) ties are used Figure 23. The strength,
                  sealing at articulation joints                           number and spacing of ties should be sufficient to
                                                                           transfer the calculated loads across the joint. As a




                                                      Articulation joint                                        Articulation joint




                  Figure 23 Examples of masonry expansion (sliding/extendable) ties




Page 14 Articulated Walling