This video from the 2022 NCC Seminars discusses Part H1D7 Roof and wall cladding from NCC 2022 Volume Two.
My name is Phil Finnimore from the Australian Building Codes Board, today I'm going to talk to
you about a particular part in the roof and wall cladding section of Volume Two NCC 2022.
H1D7 roof and wall cladding, what I'd like to point out in this is the solutions relating to
gutters and downpipes. If you have a look on the right there through those relevant
Australian Standards 1562.1, 2050 and 3500.3 you'll find solutions for gutters and down pipes. Also, on
the left is a Deemed-to-Satisfy set of solutions that are contained within the Housing Provisions
for NCC 2022, if that's the DtS solution that you choose. So specifically we're talking about
clause H1D7 of Volume Two which will take you through H1D7(4) subclause (b) to Part 7.4 of the Housing Provisions
for solutions for gutters and downpipes. But before we move into that and talk
about the detail I'd like to point out that the Housing Provisions, which is different to NCC 2019,
we've excluded the provision of box gutters in those Deemed-to-Satisfy solutions.
There are solutions for box gutters but they exist in 3500.3, the only thing that 2019 talks
about in terms of box gutters is the requirement for a fall and then it sends you across to 3500.3.
So a decision was made for 2022 in the Housing Provisions to exclude box gutters
entirely so that the complete solution is in that reference document 3500.3.
There were only a few changes to this particular set of technical DtS provisions
in the Housing Provisions for 2022 and I'll point those out to you now.
The first one is a change in terminology from 2019 to 2022, which is
described there we've gone from the average recurrence interval to annual exceedance probability
it's a defined term and this term has been changed to a line with 3500.3.
Along with the data for rainfall intensity, so if we're looking at these particular tables and this
one is for the Australian Capital Territory, you'll note that there are differences in those rainfall
intensities this is based on weather bureau data and it's also aligned with the review of 3500.3
to maintain consistency between the code and the relevant Australian Standard. For 2022 on the
Housing Provisions we've expanded a little bit for valley gutters in the part relating to the
installation of gutters specifically clause 7.4.4, we provided in there a little bit more
detail through subclause (4) about dimensions and the pitch relevant tables things like free board
set out in subclass (c) there and side angles. And what we've done to support this is provided tables
with different rainfall intensities which will give you different dimensions across those
three columns for effective depth and width, and supporting that also is explanatory information
which sets out in profile in an illustrative way what those table dimensions actually relate to.