Box Gutter Sump Regulations

Sumps are to be appropriately sized in accordance with as nzs 3500 3 with a minimum length of 400 mm and when fitted with a high capacity overflow device with a depth of not less than 150 mm when either one or two box gutters enter the sump.

Box gutter sump regulations.

For commercial projects the minimum allowable width is 300mm. Vertical faces enter the full vertical face area. Have a minimum width of 300mm for commercial installations 200mm for domestic installations. However any width can be entered.

For the associated box gutter outlet. Read more about compliant guttering options what does it mean for installers. Down pipe must be vertical from sump not to the side minimum sump length is 400mm. Overflow devices need to discharge to the atmosphere in such a way as to prevent damage to buildings and property.

Sump with a side overflow device sumps do require an increase in the depth of flow in the box gutter and gutters are to be fitted with either. Sizes the depth shown of the box gutter is the depth at the upstream end. Box gutters must be straight no bends. Trial box gutter width the minimum width allowed for domestic projects is 200mm.

Experiment with this figure to get the depth of box gutter you require. The regulations require that guttering has allowances for water to overflow gutters in a way that does not cause water to flow back into the structure. State of victoria victorian building authority 2017 published june 2017. Have a minimum depth of 75mm at the high end.

This will prevent water damage in the event of gutters overflowing either due to high rainfall or a blockage. Have a sole width which is not reduced discharge at the downstream end without.