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(Nbvember f 1983)Trade names for proprletaiy expansion jointsshould as far as possible be excluded from specif i oat ionsand drawings to avoid any suggestion that their choicemight be influenced by other than engineering considerations*Proprietary expansion joints should be obtainedfrom suppliers on the Lands and Works List of Suppliersand Specialist Contractors for Materials and Works*Responsibility for the installation of proprietaryexpansion joints should be explicitly assigned tothe supplier, with the main contractor providingattendance only*Proprietary expansion joints should beselected by one of the following methods* Either(a) tenders should be called from suppliers onthe Lands and Works List and the mostsuitable tender selected by the appropriateprocedure; supply and installation of theselected joints should then be includedin the main contract as a Prime Go&fc Sumand the main contractor required to enterinto a formal sub-contract with the selectedsupplier as a Nominated Sub-contractor; thesupplier should be expressly required toinstall the selected joints while the maincontractor only provides attendance j or talternatively!(b) the main contractor should be required tosubmit detailed proposals to the Engineerfor approval based on the use of aproprietary expansion joint supplied bya supplier on the Lands and Works List}the main contractor's proposals shouldallow for the proprietary expansion jointto be installed by the supplier while themain contractor provides only attendance*Suppliers in the "Expansion Joint 1 * category ofthe Lands and Works List are given in Appendix 4*11 «1«Acceptable proprietary expansion joints and their mainmechanical properties are lisrted in Appendix 4*11«2»Other proprietary expansion joints may only be usedwith the prior approval of C*E*H«/Str« B«