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When do I use a Latham Strip which has Neoprene 12mm thick?
Normally 6mm Neoprene-X-Pansion joints are used internally whilst 12mm are used externally in combination with reduced bay sizes, but Latham recommend the following.

Paving shall be divided with N-X-P strips into wholly separate bays to control and isolate movement stresses, in accord with the recommendations of AS 3958.1 - 1991 Ceramic Tiles - Part 1: Guide to the installation of Ceramic Tiles, Section 5 Clause 5.4.5.2. Maximum bay sizes shall take into account the dimensional stability and stiffness of the supporting structure, the location of the structural movement joints, the degree of exposure and response of the pavement to temperature and moisture variations and the overall expansion characteristics of tiling, paving and substrate materials.

Install N-X-P joints wherever tiles abut massive obstacles and fixed structural elements such as columns, stair and lift wells, steps and ramps, ie. wherever movement induced by expansion, contraction, deflection and settlement may be concentrated or impeded.  Isolate tiles and under bedding from rigid and massive elements attached to or penetrating the structural base, for instance handrail and balustrade stanchions, light poles, street furniture supports and brackets, guy wire anchors, pipework and the like by installing N-X-P joints.

Ensure that all movement joints in paving and flooring penetrate the full depth of tiling and under bedding to the slip sheet, waterproofing membrane or structural deck, whichever directly contacts the under bedding. Ensure that N-X-P joints are accurately and continuously aligned above expansion, contraction and untied construction joints.  Locate N-X-P joints at all changes of direction in large tiled areas. Locate joints so as to subdivide geometrically complex areas into bays of simple shape and to avoid acute angle junctions in joint strips. Continue joints along walls and extend through coving where indicated in the drawings by installing matching N-X-P coving sections.

Joint depth, and therefore selection of the appropriate size of N-X-P control joint, shall be set by the level of the top of the wire anchor when fixed in its anchoring loop, plus the thickness of the paving and a reasonable allowance for tolerances and variations in workmanship. Strips shall be an overall height of ..... mm by 6mm <12m > neoprene control section width (refer to design charts for dimensions), cut to length so that anchors fixed to loops occur within 50mm of the ends of each section of jointing. Combinations of joint lengths shall be selected and configured to ensure that each section contains at least three pairs of symmetrically opposed anchors. Butt joints in control joint strips shall be located to avoid intersection of three or more ends. Where N-X-P joints separate bays of rough surfaced tiles, exfoliated natural stone, textured reconstituted stone, porphyry paving sets and the like, set the top of metal edges flush with or slightly below the level of low points in the paving material to prevent mechanical damage to projecting joint strips.

Control joint strips shall be installed in the locations and configurations shown in the drawings while the bounding sand/cement mortar under bed is in a plastic workable state. Strips shall be fixed directly and consistently over previously formed, intact and unfilled trowel-cut gaps or over compressible closed-cell foam filler strips and rods. Strips shall be securely fixed by inserting the specified and supplied wire anchors through corresponding loops and into the adjacent under bedding. The sand/cement under bedding bounding the control joint assembly shall be trowelled to ensure firm anchorage in dense compacted material, taking care not to dislodge filler strips or collapse the sides of trowel-cut grooves.

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