Box Gutter Sump Regulations

The minimum size of a sump is 400mm x 200mm minimum width of box gutter and 150mm deep.

Box gutter sump regulations.

Sides must be vertical. Vertical faces enter the full vertical face area. Must have a constant slope between 1 40 and 1 200. Down pipe must be vertical from sump not to the side minimum sump length is 400mm.

Box gutters must be straight no bends. Read more about compliant guttering options what does it mean for installers. For commercial projects the minimum allowable width is 300mm. Sizes the depth shown of the box gutter is the depth at the upstream end.

State of victoria victorian building authority 2017 published june 2017. Have a minimum width of 300mm for commercial installations 200mm for domestic installations. This will prevent water damage in the event of gutters overflowing either due to high rainfall or a blockage. 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.

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. 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. Overflow devices need to discharge to the atmosphere in such a way as to prevent damage to buildings and property. Have a minimum depth of 75mm at the high end.

Trial box gutter width the minimum width allowed for domestic projects is 200mm. However any width can be entered.