This video from the 2022 NCC Seminars discusses Section C Part C4 Protection of openings from NCC 2022 Volume One.
Hello my name is Graham Moss, Principal Building Surveyor for the Australian Building Codes Board
this video is a brief overview of changes to Part C4 protection of openings found in Section C of NCC 2022 Volume One.
The first change I want to talk about today is C4D10 which is in NCC 2019 known as C3.9.
This is the provision that stops fire isolated exits from having penetrations except for the
few things that would be necessary, for example in this photograph here we have
a hydrant riser which is necessary to meet particular requirements of the NCC and so
of course it's allowed to have that hydrant riser penetrate into the fire isolated exit.
C3.9 or C4D10 also allows electrical wiring so you can put lights in there, of course
pressurization ducting is something else that's been allowed for a long time to penetrate a fire
isolated exit. For 2022, we've added fire service test drain pipes because it's common practice to
put the test drain out in the basement car park or somewhere else outside of the fire isolated
exit so that the water drained from that test pipe can be dealt with in a place that's not a
fire isolated exit. Apparently this is a common performance solution
so we've included this sensible inclusion in NCC 2022.
This next change is to do with C3.16 construction joints or C4D16 in 2022.
here's what it looks like in NCC 2019, C3.16 in 2019 is quite restrictive because when you use
a tested system to achieve an FRL, what you put on site needs to be identical to the tested prototype
this doesn't align with other provisions, like Schedule 5, which applies concurrently
and Schedule 5 lets you use a different arrangement that has been certified by
the accredited testing laboratory, it doesn't have to be identical with the prototype.
So for 2022 that flexibility is introduced for construction joints also in C4D16.
There's another change in Section C to cover and that's in Specification 5 which is known in
NCC 2019 as specification C1.1, now this change is to do with Class 2 and 3 timber framing concession
that's the concession which lets you build a three-story Class 2 or 3 with timber
framing even though other provisions say C1.9(a) would require some elements to be non-combustible.
So for 2022 we've added the subclause (c) shown by the orange arrow on this slide
notwithstanding Spec 5 C3(1)(c) timber framing may be used. Now I'll show you what specification
5 Clause 3(1)(c) is on the next slide but before we get there I just want to show you something about
that word notwithstanding, now notwithstanding is a word that's used quite often in the NCC
and some people get confused by it so I'm going to give you a little tip today when you see the word
notwithstanding simply think despite what it says in because that's what it means notwithstanding.
So despite what it says in Specification 5 Clause 3(1)(c) timber framing may be used for a part of
the building that provides support to a part of the building constructed of timber framing
what does Specification 5 Clause 3(1)(c) say well here it is, this is fire protection for support
of another part that's an existing provision found in Specification C1.1 Clause 2.2 and
that's that part of the BCA in Spec C1.1 that says if you are supporting something that needs
to be non-combustible, then the thing that you support it with has to also be non-combustible
now considering the timber framing concession if you have an external wall that would need to be
non-combustible but because that concession can contain timber framing if you support that with a
brace wall an internal brace wall then under Spec 5C3(1)(c) it would be required to be non-combustible
so of course we've included this additional concession as a clarification for NCC 2022 because
it's always been intended that timber framing can be used throughout when that concession is used.