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Internal Gutters

Fully supported parapet and internal gutters should comply with section 8.4.4. It should be :

  • laid to a minimum fall of 1 in 200 – 12 mm in 2.4 m;
  • designed to discharge rainfall of 200 mm/h without flooding;
  • not less than 50 mm deep at the highest point;
  • designed to discharge the rainfall clear of the building if the outlet becomes blocked; and
  • designed with expansion drips at a minimum depth of 50 mm .

 

The width of a rain water head or sump must be equal to that of the gutter.

The rain water head must have an overflow area equal to or greater than the area of the gutter at a level below the height of the sole of the gutter. (see drawing 8.6.1.)

Expansion joints must be provided to accommodate the thermal movement at the gutter high points between outlets. (see drawing 8.4.4.)

 

The roof side of a parapet gutter upstand should be joined to the roof sheeting by means of a drip edge flashing. (see drawing 11.6.1)

 

Clause: 
018_006_000_000_000_000_000_000_000
Clause Number: 
18.6
/cop/trash/internal-gutters
Draft Clause: 
018_006_000_000_000_000_000_000_000