Have a minimum depth of 75mm at the high end.
Minimum gutter fall victoria.
Have a minimum width of 300mm for commercial installations 200mm for domestic installations.
Roof drainage systems should be designed and detailed by a suitably qualified trade or professional in accordance with the bca and the australian standards.
Box gutter outlets must discharge through either a rainhead or sump.
Layout box gutters must.
Overflow box gutters must have independent overflow provision discharging to the atmosphere.
This applies whether the waterproofing is a polymeric single ply membrane a reinforced bitumen membrane or another type listed in bs 6229 2018 the code of practice for flat roofs with continuously supported flexible waterproof coverings.
B be located as close as possible to valley gutters and if the downpipe is more than 1 2m from a valley provision for overflow must be made to the gutter.
Overflow sump and gutter support have been left out for clarity.
Maximum allowable length between expansion joints with one end fixed.
Gutters with inadequate fall will allow water to pond shortening the life of the gutter and creating a condition conducive to timber building and pest inspections activity.
Or 42mm per 10m.
Required gutter slope 1 40 to 1 200 there is always some confusion as to how the slope affects the overall depth.
Quantity and placement of downpipes.
Box gutter with rain water head at end of box gutter.
The depth shown in the calculations is at the upstream end.
Therefore any slope on the gutter will make the downstream end deeper or the flashing longer.
A maximum 12m gutter length served by each downpipe is to ensure effective fall and adequate capacity to discharge all water anticipated during a heavy rain period.
To achieve a 1 80 fall the code of practiceread more.
Different styles of gutter known as profiles are produced.
Water doesn t respect national.
The recommended minimum fall for a flat roof is 1 80 0 72.
The minimum size of a sump is 400mm x 200mm minimum width of box gutter and 150mm deep.
Old goat join date oct 2006 location tallahassee fl usa age 78 posts 316.
Simplified suitable for flattish roofs with little or no vertical faces or steep roofs draining to one side of box gutter only or any roof if you are in a hurry and make the necessary allowances for all catchments.
About 25mm per 6m.
For the best results i use 12th sep 2007 01 06 am 3.
Standard here is 1 inch per 20 feet.
The outlet must be no further than the diameter of the outlet to the centre of the outlet.
Dimension x not greater than downpipe size see clause 5 3 3.
And the provision of appropriate overflow devices.
