B Balcony bases
Surfaces with non-slip patterns should be designed with a 10 - 15 0/000 fall. Outer dimensions should not exceed 2 x 4 metres for ease of handling and installation.
Envelope fall to an embedded drain should always include equal-height element edges and horizontal underside. An envelope fall means greater thickness, more weight per square metre and small surfaces with a steep fall, making them less useful.
A one-sided fall to a gutter with a fall towards an embedded drain gives uniform panel thickness. The fall can be compensated by varying heights of the raised edge, so that its top edge is horizontal. Dimensions for gutters can be adapted to the drain used. Local thickening of the element by the drain can be necessary.
A one-sided fall for drainage over the front edge is the simplest model of element. The front edge can be fitted with a drip profile. A gutter can be fitted underneath to catch water.