Peter coll provides a timely update regarding the provision for overflow and box gutter compliance.
Box gutter regulations victoria.
This has become a big issue in the past few months particularly in victoria and is going to be a new section in the upcoming.
Inappropriate box gutter size for the roof catchment area.
This free online box gutter calculator will calculate the size of box gutters and sumps with a side overflow in accordance with the australian plumbing code as nzs 3500 3 2003 part 3 storm water drainage.
Roof drainage systems should be designed and detailed by a suitably qualified trade or professional in accordance with the bca and the australian standards.
As an alternative the top of the rainhead may be installed so that it is no higher than 50 per cent of the flow depth of the box gutter consistent with saa hb39 installation code for metal roof and wall cladding section 5 clause 5 7 3 and figure 5 7 3 to prevent internal flooding or damage to the building or contents see figure 2.
Installing box gutters to achieve compliance with relevant regulations.
Method for design of eaves gutter systems.
In victoria the installation of box gutters is regulated plumbing work that must be carried out and certified by suitably registered licensed plumbers.
Read about the new guttering standards introduced by the vba as of january 1 2016.
New regulations went into force on 1st.
All professional plumbers are aware as of 1 1 16 the vba are enforcing as3500 3 2015.
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.
Roof coverings and associated flashings not installed in a good and workmanlike manner.
Quantity and placement of downpipes.
Architects draftpersons builders and other practitioners responsible for designing a box gutter should work closely with the roof plumbers that will install the box gutter to ensure that the overall design and installation will be compliant with relevant regulations.
The side with the maximum flow is used to size the box gutter.
Box gutters plumbers must install a box gutter system in accordance with as nzs 3500 3 as nzs 3500 5 hb 114 and hb 39.
A recent audit performed by the victorian building authority found that many plumbers were installing eaves gutters with insufficient overflow capabilities.
The total flow is used to size the sump and overflow.
Plumbing regulations 2008 part 2 r 14.
It isn t often that there are major changes to the construction industry s regulations so it s important to stay informed when there is a change.
In my last article i discussed the emergence of the issue of provision for overflow in external eaves gutters or more specifically the lack of provision for overflow.
And the provision of appropriate overflow devices.
Plumbing regulations 2008 part 3 r 14.
