Box Gutter Overflow Requirements

For commercial projects the minimum allowable width is 300mm.

Box gutter overflow requirements.

All domestic box gutters must be a minimum of 200mm wide and 75mm deep. Use a 10mm spacer this creates a gap behind the gutter so water can overflow freely. Overflow devices need to discharge to the atmosphere in such a way as. The minimum width allowed for domestic projects is 200mm.

Box gutters must be straight no bends. Have a minimum depth of 75mm at the high end. Code box gutter requirements. If draining to a sump with a vertical overflow somewhere along the box gutter use this calculator.

The hydraulic capacity of the overflow device must be no less than the design flow for the associated box gutter outlet. Trial box gutter width the minimum width allowed for domestic projects is 200mm. Have a sole width which is not reduced discharge at the downstream end without. However any width can be entered.

The width of the rainhead is to be at least equal to the width of the box gutter and the box gutter needs to be sealed to the rainhead. Sides must be vertical. For commercial projects the minimum allowable width is 300mm. Rainhead overflow or specific box gutter overflow must be at least 30mm below the height of the back of the box gutter.

This effectively states that all box gutters must allow for 30mm of freeboard which is from the overflow point eg.