Minimum Box Gutter Fall

Box gutter outlets must discharge through either a rainhead or sump.

Minimum box gutter fall.

Box gutters should have a minimum fall of 1. This effectively states that all box gutters must allow for 30mm of freeboard which is from the overflow point eg. Overflow box gutters must have independent overflow provision discharging to the atmosphere. We can manufacture this box gutter to your custom measurements.

The amount of collected water increases until it spills over the sides of the gutter. The gutter slope also called the pitch is the amount the gutter tilts down to let rainwater flow out of it. Have a minimum depth of 75mm at the high end. If gutters slope too severely they don t hold water and water could splash over the sides in heavy rain.

Allowable box gutter width slope and length required by the australian plumbing code as nzs 3500 3 2 box gutters allowable width slope and length to as nzs 3500 3 2018 stormwater drainage acceptable solutions. Box gutters are essentially placed between parallel surfaces as in a valley between parallel roofs or at the junction of a roof and. It may be lined with epdm rubber metal asphalt or roofing felt and may be concealed behind a parapet or the eaves or in a roof valley. Can i change the measurements on this box gutter flashing.

If gutters don t slope water gathers in them. Rainhead overflow or specific box gutter overflow must be at least 30mm below the height of the back of the box gutter. I fall or slope box gutters to be installed with a minimum uniform fall of 1 in 200 towards the outlet.