Abstract: A method of forming a threshold drain 31 is disclosed. The drain 31 extends alongside an exterior wall 4 of a building and is formed in an exterior surface 36. The building has an interior floor 21 with the exterior surface 36 and the interior floor 21 being substantially flush to permit traymobile, wheelchair and invalid access. In a single concrete pour, the drain gutter 31, exterior surface 36, interior floor 21 and a gutter 40 are all formed. The gutter has an exterior side wall 39 which supports a plurality of triangular cantilever arms 43. A support frame 42 having two longitudinally extending rims 51,52 is supported by the arms 43 and releasably receives a grate 32 between the rims 51, 52. The inner rim 51 is spaced from the wall 24 of the building, preferably by 10-12 mm (?-½ inch), so as to provide a barrier to moisture in accordance with the Building Code of New Zealand standard set out in Clause E2 External Moisture. The drain 31 is also disclosed.

Abstract: A method of forming a threshold drain 31 is disclosed. The drain 31 extends alongside an exterior wall 4 of a building and is formed in an exterior surface 36. The building has an interior floor 21 with the exterior surface 36 and the interior floor 21 being substantially flush to permit traymobile, wheelchair and invalid access. In a single concrete pour, the drain gutter 31, exterior surface 36, interior floor 21 and a gutter 40 are all formed. The gutter has an exterior side wall 39 which supports a plurality of triangular cantilever arms 43. A support frame 42 having two longitudinally extending rims 51,52 is supported by the arms 43 and releasably receives a grate 32 between the rims 51, 52. The inner rim 51 is spaced from the wall 24 of the building, preferably by 10-12 mm (?-½ inch), so as to provide a barrier to moisture in accordance with the Building Code of New Zealand standard set out in Clause E2 External Moisture. The drain 31 is also disclosed.