Attachment 4 - Site Investigation and Slab Report

guide, for brick masonry, ties should be provided            7.1.4 Termite Barriers
every fourth course and for block masonry, every             Articulation joints do not prevent the installation
second course, ie at 400-mm centres. If a filler strip       of effective termite barrier systems within the
is used it should extend around the sliding ties. For        masonry wall or cavity since each barrier system
masonry having hollow cores, adequate embedment              has specific details for this situation. Note that any
of the ties will generally require the grouting of any       termite barriers that cross articulation joints must
cores containing the larger sliding ties.                    be able to accommodate the expected movement.
    For masonry veneer (brick or block) and
reinforced single-leaf (block) masonry walls, sliding        7.2       Windows and External Doors
ties may also be provided, but are generally not             In residential buildings articulation joints should be
required as the masonry on either side of the joint is       combined with window or external door openings
held in place by either a structural frame (typically        wherever possible, as these typically form points
timber) or reinforced and grouted cores which                of weakness within the masonry wall, at which
provide the required support to the masonry.                 the risk of cracking is increased. The continuous
                                                             vertical articulation joint, running from footing (or
                                                             damp-proof course) to roof, can be provided on the
                                                             line of the window or door jamb. These locations
                                                             also assist to reduce the visual impact of the joint
                                                             as it is possible to conceal much of the joint behind
                                                             architraves and cover mouldings, particularly with
                                                             full-height windows and doors.
                                                                  For windows or doors up to 1.8 m wide, and with
                                                             the maximum joint spacings from Section 5, an
                                                             articulation joint is generally required on only one
                                                             side of the window or door. For larger windows and
                                                             doors, articulation joints at both sides of the opening
                                                             should be considered Figure 24. Note that if one
                       Articulation                          side is less than 2 m from a corner, an articulation
≤ 4.5 m                      joints
                                                             joint on the side closest to the corner will be of little
from corner but if
≤ 2.0 m, joint will    More                                  benefit Figure 3.
be of little benefit   than 1800                                  It is essential that a gap is left between the
                                                             window or door frame and masonry to ensure that
Figure 24 Articulation joints should be considered           movement is possible. One method of achieving this
at both sides of wide window/door openings                   in cavity/solid masonry while still providing secure
                                                             fixing of the frame to the walling, is to use column
                                                             expansion ties fixed to the widow or door frame



Note:
Various tie types
available                                            Masonry expansion tie                 Architrave conceals joint on inside
                                                     screwed to window frame
                                                                                                          Window/door frame




                                                                                                Cover moulding conceals
                                                                                                articulation joint on outside


                                                                                     Gap




Figure 25 Fixing of window/door frames at articulation joints


                                                                                                     Articulated Walling Page 15