Therefore it is very important to consult with the roof plumber for the project where the roof frame is designed and a compliant gutter cannot be installed without major roof frame alterations.
Box gutter design vba.
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.
Box gutter design and compliance is detailed in plumbing regulations sa hb 39 installation code for metal roof and wall cladding as well as saa snz hb 114 guidelines for the design of eaves and box.
The total flow is used to size the sump and overflow.
State of victoria victorian building authority 201 7 published june 201 this fact sheet provides guidance to the building and plumbing industries on designing and installing box gutters to achieve compliance with relevant regulations.
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.
Overflow provision for box gutters october 2014 the vba has identified several instances of plumbing practitioners failing to install appropriate overflow provision in box gutters and rainheads.
In victoria the installation of box gutters is regulated plumbing work that must be carried out and certified by suitably registered licensed plumbers.
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.
They are simply described on the vba s box gutter design fact sheet as a graded channel generally of a rectangular shape for the conveyance of rainwater within the building footprint including adjacent to a wall or parapet.
Plumbers are reminded that roof drainage systems need to be designed and installed with appropriate overflow provision.
Box gutter and overflows.
Peter coll provides a timely update regarding the provision for overflow and box gutter compliance.
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.