2131 Permanent shoring (6) Permanent shoring and supports to existing structures on and off site, which are to remain in place at the conclusion of the Contract 2132 Retaining existing facades (0) Retaining facades of structures which are otherwise to be demolished and maintaining the facades until incorporated into a new structure 2133 Temporary support to existing structures (1) The temporary support of houses and similar existing structures during lifting for the construction of alterations and for re-piling