A box gutter must be installed with a fall not less than 1 100 and be designed in accordance with the joint australian and new zealand standard as nzs 3500 3 or section 5 of as nzs 3500 5.
Box gutter regulations nsw.
High front guttering advisory committee report in 2010 the high front guttering advisory committee was established to investigate concerns that high front guttering products and installation techniques may be.
The builder or guttering installer needs to make sure the gutter system is fully compliant with nsw laws and australian standards.
There is always some confusion as to how the slope affects the overall depth.
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.
There is detailed government legislation regarding the design installation and maintenance of guttering.
The depth shown in the calculations is at the upstream end.
Box gutters allowable width slope and length.
Minimum width 300 mm for commercial construction and 200 mm for domestic construction.
Required gutter slope 1 40 to 1 200.
Read more about compliant guttering options.
All domestic box gutters must be a minimum of 200mm wide and 75mm deep.
Pre manufactured gutter mitres and gutter angles for many guttering profiles reduce the need for creating mitres on site therefore simplifying the installation.
Examples of box gutters are shown below.
Understanding the ncc gutter and downpipe provisions for housing includes information for building designers hydraulic consultants plumbers builders and other onsite trades about the selection and installation of gutters and downpipes including overflow measures.
This effectively states that all box gutters must allow for 30mm of freeboard which is from the overflow point eg.
Rainhead overflow or specific box gutter overflow must be at least 30mm below the height of the back of the box gutter.
In victoria the installation of box gutters is regulated plumbing work that must be carried out and certified by suitably registered licensed plumbers.
For commercial projects the minimum allowable width is 300mm.
You do not want to put extra pressure on the system.
Always check the measurements of your building and work out exactly how much downpipe will be serving each gutter.
This will prevent water damage in the event of gutters overflowing either due to high rainfall or a blockage.
Stratco gutters are strong yet lightweight making them easy to handle.
Plumbers must install a box gutter system in accordance with as nzs 3500 3 as nzs 3500 5 hb 114 and hb 39.
