This video from the 2022 NCC Seminars discusses Section G Ancillary provisions from NCC 2022 Volume One.
Hello my name is Graham Moss, i'm the Principal Building Surveyor for the Australian Building Codes Board
this video is a brief update on NCC 2022 ancillary provisions Section G.
The first change to cover today is G1D4, what's known in 2019 as G1.3 and that's outdoor play
spaces for early childhood centers. Now it's always been the case that the outdoor play
space needs a 1926.1 compliant pool fence that is 1926.1 the reference standard for pool fencing.
So for this reason the fence which is at the edge of an outdoor play space will need to be
at least 1.2 meters tall. This year we've added (1) (b) and (c) as shown by the orange line on this slide
for where there is a fall of two meters or more, now this fall could be because of the retaining wall.
For instance or for other landscaping, however this provision was developed to cover outdoor
play spaces that are found on balconies or on rooftop spaces. So if you have a
2 meter fall the fence needs to be at least 1.8 meters tall to meet these requirements.
Next I want to cover is Part G5 construction in bushfire prone areas there's been some
significant changes this year, because under NCC 2019 in the national provisions
the only buildings that Volume One requires to meet bushfire requirements are a
Class 2 or 3 building or an associated Class 10a like a deck or a bin store.
For NCC 2022 we have a new section for the Class 9 buildings that you
see listed here they're hospitals, early childhood centers, primary and secondary
schools and residential care buildings such as aged care buildings. Now note this isn't
every type of Class 9 building for example you don't see a sports stadium listed here
these particular building types are ones where the occupants are vulnerable and
therefore it's appropriate to provide extra provisions to protect them in a bushfire event.
I'll take you to those extra provisions shortly but the first thing to note if these Deemed-to-Satisfy
provisions for these special Class 9 buildings apply only to BAL 12.5
now you're probably aware of the AS 3959 bushfire attack level the BAL rating
system, that's a risk rating system which based on the likelihood of exposure to bushfire attack.
These DtS provisions for certain Class 9 buildings run out at BAL 12.5, if you go up to
BAL 19 or above you need to do a performance solution however up to bushfire prone land up to BAL 12.5
are covered by these Deemed-to-Satisfy provisions. If you're familiar with the
current bushfire provisions for Class 2 and 3 buildings you'd be aware that for these
particular buildings we refer you to AS 3959 for construction requirements. Now for these special
Class 9 buildings it's different we don't refer to AS 3959 instead we send you to Specification 43
which contains the construction requirements for these special buildings, now these construction
requirements do exceed those that are found in AS 3959 I'll step you through those right now.
First provision to show you is clause 2 in Specification 43 separation from classified vegetation now this
is quite similar to requirements found in AS 3959 what we're requiring is a minimum
distance from vegetation that's specified and that's a concept straight from AS 3959.
Next is clause 3 separation between buildings you have three options and I'll explain those
options using the hypothetical scenario with these three buildings A, B and C the first option is a
distance of at least 12 meters between buildings as is the case between A and B here. If you have
12 meters or more then you meet the requirements but buildings B and C are within 12 meters of each
other and that's where clause 2(b) comes in there are more options inside this Clause that both
involve envelope protection so the first option is to provide frl60/60/60 walls as shown on building B.
The next option as shown on building C is a tested envelope system now that entire envelope needs to
be submitted to a test under AS 1530.8.1 for a flux of at least 10 kilowatts per square meter.
Now AS 1530.8.1 isn't a primary reference in NCC 2019 however it is caught up by AS 3959
it's the standard that's used by manufacturers and people like that to test windows, doors and
other things to find out what BAL those could withstand and of course it can be used also
for to rate a wall or a roof system as an option for buildings within 12 meters of another building.
So that's clause 2 separation between buildings we also require separation from
hazards including a boundary or an open car park that's clause 4.
clause 5 requires protection from other hazards like a bin compound now that
needs to be at least 10 meters but if you don't achieve 10 meters you can use the
same protection methods that I outlined before an frl60/60/60 wall or the tested envelope system.
So with four provisions about separation you can see that this is an important part of the
fire safety strategy for bushfire protection for these Class 9 buildings and of course that's not
new it's a established way of protecting buildings from the effects of bushfire. However that's not
all we also have clause 6 which is requiring a non-combustible path at least one and a half
meters wide around the building so you can't have garden beds for instance right up against
your building. Next is clause 7 access pathways what you'll find in this provision are additional
requirements beyond those found in D1.10 for exit pathways from buildings. Clause 9 is important to
note there needs to be internal tenability maintained for the duration of the bushfire
and so clause 9 contains special requirements in order to ensure that that internal tenability is
met. Clause 10 building envelope you have to build the walls and roof to AS 3959 as if your building
is in a BAL 19 Zone even though it's only up to 12.5 for which these provisions supply.
There's also water supply requirements even if your building doesn't need a fire hydrant
you need to at least have a water supply that could be a pool or a dam you'll find more
details in clause 11 of Spec 43. There's also a requirement for emergency power, now
this power system needs to be able to run the internal tenability systems for clause 9
and other things for a period of at least six hours. Signage is also required in clause 13
there has to be a sign somewhere saying don't store combustible material near the building.
And of course, finally vehicular access has to be provided as for a large isolated building this
requirement is to ensure that the fire brigade can easily access the building and affect operations.
Now this is a very brief overview of the new Class 9 bushfire provisions, if you are
working with Class 9 buildings in bushfire prone areas I do recommend that you have a
closer look at Part G5 and Specification 43 in the production version of NCC 2022.
Also new for Section G is livable housing or you might know of this as accessible housing
this is also in Volume Two in Part H8, what is livable housing? Well I'll explain it this
way currently there are no accessibility requirements in the NCC for the internal
parts for Class 2 unit or indeed for a Class 1a house to be accessible, there's no requirement
under NCC 2019 for these internal dwellings to be accessible but that changes with NCC 2022.
Both Volume One and Volume Two refer to a new ABCB reference standard the Livable Housing
Design Standard I've talked about making these dwellings accessible but livable
housing isn't so much about making these accessible but rather making them adaptable.
This is a diagram from the standard and under the standard you need to have a toilet on the entrance
level of the dwelling that toilet has to be next to a wall and though the grab rail doesn't have
to be installed for the final inspection you do need to have blocking or sheeting installed so as
to be able to receive a handrail in the future. So the handrail doesn't have to be there for
the final inspection but the blocking or the sheeting needs to be there. So of course this
is a way amongst others of how the Livable Housing Standard makes a dwelling adaptable.
There are other requirements listed on this slide we're talking about step-free entry, circulation
requirements as shown by this diagram here, corridor widths of one meter or more
minimum doorway widths, also the requirement for a step-free shower. Now at the time of recording
of this video the technical requirements of the Livable Housing Standard had not been
finalized so of course we're not in position to update you fully during this video, however
do watch our website abcb.gov.au because we certainly intend to support livable housing
provisions when they're finalized with detailed education so please watch this space abcb.gov.au.