Box Gutter Overflow Requirements

For commercial projects the minimum allowable width is 300mm.

Box gutter overflow requirements. Overflow devices need to discharge to the atmosphere in such a way as. If draining to a sump with a vertical overflow somewhere along the box gutter use this calculator. For commercial projects the minimum allowable width is 300mm. Use a 10mm spacer this creates a gap behind the gutter so water can overflow freely.

Have a minimum width of 300mm for commercial installations 200mm for domestic installations. Sides must be vertical. However any width can be entered. Box gutters must be straight no bends.

Code box gutter requirements. 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. Have a minimum depth of 75mm at the high end. Rainhead overflow or specific box gutter overflow must be at least 30mm below the height of the back of the box gutter.

Hang the gutter lower the top of the bead must be 20mm below the top of the fascia to allow water to overflow safely over the bead. This effectively states that all box gutters must allow for 30mm of freeboard which is from the overflow point eg. The vba has provided several options for plumbers to make an installation compliant. 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.