Attachment 4 - Site Investigation and Slab Report

               Clay brickwork              Concrete or sand/lime brickwork                       Concrete blockwork




                                Articulation joint                                   Articulation joint

Figure 14 Articulation joints at changes of wall thickness/material


       Elastomeric sealant       Render terminated in render       7         DETAILING OF ARTICULATION JOINTS
                                 starter or expansion joint trim   7.1       External Walls
                                                                   To maintain the bonding pattern at vertical
                                                                   articulation joints (recommended), half-length
                  d*
                                                                   bricks or blocks should be used at joint locations in
                                                                   masonry walls. The option of toothing masonry at
 D       Service run in chase
         (eg, insulated          Compressible filler               joints is generally not recommended because of the
         hot-water pipe)                                           difficulty of ensuring the required gap is achieved.
                                 Elastomeric sealant               (Note that AS 3700 does not allow toothing unless
                                                                   it is specifically considered in the design). Further,
 * If depth of chase > 0.25D
                                                                   as most sealants perform better in tension and
     an articulation joint is    Articulation joint
     required                                                      compression (at the vertical joint) than in shear
                                                                   (at the horizontal part of a toothed joint), suitable
Figure 15 Articulation joints at deep chases                       joint details must be specified if toothing is being
                                                                   considered.
                                                                        If the walls are rendered or coated, the same
                                                                   movement capacity available in the articulation joint
                                                                   should be provided in these finishes. Render can
                                                                   be stopped either side of the joint by using a starter
                                                                   trim or possibly an expansion-joint trim. Simply
     Articulation joint                                            forming a groove in the render at the joint location
                                                                   is not recommended Figure 18 (a). Bagged finishes
                                                                   and other types of thin coatings should also be kept
                                                                   flush with the edges of the joint. The painting of
                                                                   these types of finishes (including the sealant) will
                                                                   make joints less conspicuous Figure 18 (b).
                                                                        Articulation joints must be free of mortar and
                                                                   may be packed with a compressible filler such as
                                                                   polystyrene or a closed-cell polyethylene foam to
                                                                   ensure a continuous gap and provide a backing for
                                                                   an elastomeric sealant to be gunned into the joint
                                                                   Figure 19. Note that semi-rigid foams, bitumen-
                                                                   impregnated fibre board (eg jointex) or cork are not
                                                                   suitable as permanent joint fillers because of their
                                                                   limited compressibility. Alternatively, a temporary
                                                                   filler may be used to keep the joint clean and true;
                                                                   when removed, a permanent backer rod is forced
                                                                   into the joint to provide a backing for the sealant
                                                                   Figure 20. Note that the joint must be clean and free
                                                                   of any materials (eg mortar) that would prevent or
Figure 16 Articulation joint at offset in wall                     restrict closing of the joint.




                                                                                                          Articulated Walling Page 11