This video from the 2022 NCC Seminars discusses Section F Health and amenity from NCC 2022 Volume One.
Hello my name is Graham Moss, I'm the Principal Building Surveyor for the Australian Building Codes Board
and this video is an update on NCC 2022 Volume One Section F health and amenity.
I'll get into the technical changes in Section F shortly but first I want
to show you the structural changes or the changing to the referencing system.
What we've done for 2022 is we've taken what was F1 in 2019 and broken that into three parts.
Now F1 today in NCC 2019 is not a very long part it's about nine pages in my hard copy BCA.
But it's grown in 2022 we've got some additional Deemed-to-Satisfy provisions and once more we're
doing some work at the moment and we plan to put more provisions in NCC 2025 the next scheduled
edition of the NCC. So it made sense for NCC 2022 to split Part F1 into three different parts.
So part F1, the new part F1, is surface water management, rising damp and
external waterproofing, water outside the building. Part F2 is where there
is an overflow protection, water inside the building and Part F3 is roof and wall cladding.
So as a result of splitting Part F1 from 2019 into three parts for 2022
Section F in 2022 has changed its structure quite significantly, what was six parts is now eight.
So to the technical changes F1D4 is the first one I'll talk about today it's a new clause
that recognizes that construction joints are where leaks tend to happen. So under the Deemed-to-Statisfy
provisions for NCC 2022 your construction joints, your control joints, expansion joints, key joints in
fact any type of joint that is a part of a roof or a balcony or something like that that needs
to be waterproofed in accordance with AS 4654.2 that's a standard already referenced by the NCC.
If these joints are part of a roof balcony or something like that that needs to be
waterproofed then that joint needs to be waterproofed in accordance with 4654.2 that
is it needs to be protected. Now note subclause (b) in F1D4 here, our analysis showed us that there
are enough situations where control joints have been installed under fish ponds, under
green roofs, under plantar boxes and things like that which are consistently wet there's enough
control joints in those scenarios to make it necessary to include that subclause, which
is saying don't put those control joints there because that's where a failure is going to occur.
Now I need to clarify a few things about F1D4 exposed joints to help you use it in NCC 2022.
The first thing I want to clarify is this term here drainage surface,
so what is a drainage surface, well put simply it's what the rain falls on.
F1D4 is about surfaces exposed to weather so think flat roofs, podiums, rooftop courtyards,
things like that so the rain falls on these surfaces and that rain has to drain somewhere
so of course that makes it a drainage surface so when we're talking about drainage surfaces
of course we're talking about things that the rain falls on and therefore needs to drain away.
The next thing I want to clarify in F1D4 here is in this notes box we talk about an
exposed joint which is directly below the drainage surface. Now this is a notes box which is normative
it's not information it's explanatory it's not commentary it's actually a part of the provision
and sets out something that needs to be complied with. What this notes box is saying is that an
exposed joint which is directly below the drainage surface is one which needs to be protected also.
So what sort of scenario is that what are we getting at when we're talking about an exposed
joint directly below the drainage surface. Let me explain using this example so consider
this concrete slab we'll consider it a podium and so the rain is falling on this podium
and so of course the top of this concrete slab becomes a drainage surface and so you might be
thinking okay I've got a control joint in this drainage surface therefore F1D4 is telling me
I need to provide protection in accordance with AS 4654.2. However someone might think here's an idea
I don't want that to be the drainage surface I'll introduce a new drainage surface, I put down some
grout, put down some tiles on top of that and now the tiles become the drainage surface and the
control joint is no longer in the drainage surface, great idea? Well no it doesn't work that way.
It's true that the tiles have become the drainage surface but the notes box that I pointed out for
F1D4 clarifies that we're also talking about construction joints that are directly below
or just below the drainage surface. So backing rods, some grout and tiles isn't going to cut it
when it comes to F1D4 for NCC 2022. Instead the solution might look something like this
this is a representation of one of the details in AS 4654.2, as you can see we've got a membrane which
is bonded to the slab either side of the control joint, we've also got a tape over the backing Rod
so as to allow movement and then another membrane goes over the top of the tape and buns to the
membranes either side and then the grout and tiles can go down. Just one last thing on F1D4 exposed
joints you may have noticed that among other things this provision applies to joints in roofs
and you may be thinking well what about a metal roof or a tiled roof or a conventional
sort of roof that's not a concrete slab do I have to go and treat those joints as well?
Well the answer is no of course and that's taken care of by Part F1's application clause which is here
on the screen F1D2. Now F1D2 is setting out that F1D4 the joint clause does not apply to a roof
covering that complies with F3D2 (a) to (d) which I have listed there the conventional types of roofs.
Note also application of part that F1D5 a provision I'll show you shortly does not
apply to a roof with a covering complying F3D2 so a conventionally covered roof and also
it doesn't apply it to a perforated surface or a surface which is directly above ground.
What's F1D5, well I'm glad you asked that's the next change I want to show
you and that's external weatherproofing membranes, external waterproofing membranes.
Now F1D5 is a development of what's in NCC 2019 as F1.4. Now in NCC 2019 F 1.4 simply says that
waterproofing membranes for external above ground use must comply with AS 4654.1 and AS 4654.2.
Now strictly speaking F1.4 under NCC 2019 doesn't say that you have to install it,
read strictly it's saying that if you do install it you need to comply with the AS 4654 series.
So as you can see in the changes on the screen here F1D5 is saying that
yes every roof, every balcony, every podium, every similar horizontal surface or part
of a building must be protected with a waterproofing membrane.
If you want to do something different, for example if you want your balcony to have a plain concrete
finish then that would have to be a performance solution on account of this new provision F1D5.
So remember how I showed you application of Part F1D2 I'm showing you this photograph to
demonstrate how F1D5 doesn't apply to a balcony that is directly above the ground. So consider the
ground floor apartments in this photograph here, the one for instance closest to the photographer.
The ground floor apartments here are directly above the ground and therefore that balcony
would not need to be treated for weatherproofing. In accordance with AS 4654.2 it won't need a
membrane, however the other balconies pictured in this photograph, the ones that aren't directly
above the ground would need to be provided with a membrane on account of the new provision F1D5.
Next is Part F2 wet areas and overflow, now not much has changed but at the same time a lot has
changed, what do I mean by that? Well not much has changed there hasn't been many technical changes
I will show you the technical changes in a moment but at the same time a lot of the old requirements
are presented in a new way, especially Table F1.7 part of which I have shown on this
slide here. Now being the Australian Government we're confined to publishing guidelines and
under those guidelines we can only use tables for representing data, tabulated data, we can't
use tables for presenting text in the way that F1.7 does now. So we've had to make amendments
for NCC 2022 where this tabulated text is taken out and placed into clauses. I'll show
you what that looks like in a moment but first note the technical requirements in NCC 2019
for shower walls, note that water resistant was all that's required for shower walls up to the 1800mm
of course the junctions have to be waterproof also the first 150mm has to
be waterproof but the walls need only be up to the 1800, the walls need only be water resistant.
This is what that information looks like in NCC 2022, first note the technical change the walls
of the shower area must now be waterproof not water resistant for that full 1800 millimeters
but note also how what was presented in a table is now presented as a clause in a new specification
Specification 26. Now you might remember that handheld bidet spray suddenly became popular
recently, so the BCA is keeping up with the times we now have additional waterproofing requirements
for toilets with a bidet spray so you'll note that this is more stringent than a room that contains
only a toilet without the bidet spray. Before we leave Part F2 here's another technical change it's
a change to do with floor waste, this photograph is of a change room in an office building in the hand
basin area I have shown here a floor waste, now that floor waste is not required by the NCC.
There's only three times that the NCC makes you install a floor waste that's when it's inside
a shower, that's when you have a shower you need to have it install a floor waste for the shower
that's when you have a bathroom or laundry above a sole-occupany unit or a public space for Class 2, 3 and 4 buildings
or Class 4 parts of a building of course that's F1.11's requirements
in NCC 2019, which remains the case for NCC 2022. And also if you have a room containing a urinal
there's a requirement to provide a floor waste but those are the only times that a floor waste
is required by the BCA. So this floor waste in the photograph here is a voluntarily provided floor
waste because it's not serving a shower a bathroom above an SOU or a room containing a urinal.
Now this floor waste photographed here is a little bit like if I chose to install a fire hose reel in
my garage at home, now my garage at home is not required to have a fire hose reel it's only a
Class 10a building. So if I choose to put a fire hose reel in my garage at home because I like
fire hose reels well I don't have to put that fire hose reel within four meters of an exit I don't
have to put that fire hose reel with a spindle height at 1500 millimeters all these requirements
that would apply to a required fire hose reel don't apply to one that's installed voluntarily.
Now that's the case under NCC 2019 for this particular floor waste photographed here because
that floor waste is installed voluntarily there is no need to grade the floor to that floor waste.
However if it was a required floor waste like in a shower or a bathroom or laundry above an
SOU or a public space in a Class 2, 3 building or a Class 4 part of a building or in a room containing
a urinal, if the BCA said yes you must have that floor waste then the BCA also says you must grade
the floor to that floor waste but a voluntarily provided floor waste under NCC 2019 the floor
does not have to be graded to it. That changes for NCC 2022, this is a change for both volumes
I've got both volumes shown here F2D4 in Volume One and 10.2.12 for Volume Two. Now note that F2D4
subclause (2) we're saying that where a floor waste is installed whether it be a floor waste that's
required otherwise by the BCA or a floor waste that's installed voluntarily, if a floor waste is
installed then the floor must be graded along the line of the parameters shown on that slide.
Next is Part F3 roof and wall cladding so I have a photograph of a roof here, now this is the roof of
Terminal 3 at Sydney Airport, not every commercial roof is covered in gravel I admit that but under
that gravel will be a concrete slab with a waterproof membrane and that's a very common
way of finishing roofs in commercial buildings in Australia. However it's also not a Deemed-to-Satisfy
solution because F1.5 lists the Deemed-to-Satisfy solutions for a commercial roof
and includes tiles metal sheet and a few other things but it does not under NCC 2019 contain
waterproof slabs. That changes with NCC 2022 we've added a new option in F3D2 what used to be F1.5
and as you can see there an option for a roof is an external waterproofing membrane
complying with F1D5 which is that provision that we covered recently.
Now speaking of a lack of Deemed-to-Satisfy provisions for a long time we've had this note
in F1.0 of Volume One, it's an information box not a normative note just an informative information
box reminding you that there are no Deemed-to-Satisfy Provisions for weatherproofing
of external walls in Volume One. Now I'm glad to say that this box is deleted in NCC 2022 and
that's because in NCC 2022 we now have Deemed-to-Satisfy provisions for wall cladding, you can
use masonry to 3700, autoclaved aerated concrete to 5146.3 or metal wall cladding to AS 1562.1.
We've included those standards because each of those have provisions covering the weatherproofing
of the external walls and so they can be called up for the purposes of demonstrating weatherproofing
compliance with relevant performance requirements. Now this might seem restrictive, commercial
buildings are clad in more ways than just these three ways so that's why we're working
on introducing further Deemed-to-Satisfy provisions for commercial cladding in Volume One and we plan
to have these additional provisions in NCC 2025, the next scheduled edition of the NCC.
So in the meantime it might not seem like many but of course it's better than nothing which
is what we've got currently in NCC 2019 so an inclusion and an improvement for NCC 2022.
This next change is in Part F4 and it's a clarification currently the BCA has this line in
NCC 2019 requiring that in certain circumstances an ambulant facility must be provided for use by
males and females. Now apparently this has been interpreted by many as meaning that it's okay
in normal circumstances to have a single unisex ambulant facility because it can be used by males
and females, well that's not the intent. Which is why F4D5 which is the development of this
provision for NCC 2022 contains this clarification and as you can see we really spell it out we've
taken nine words and replaced them with 37, the sentence is now much longer but it is clear it's
pointing out that a facility for males and a separate facility for females must be provided.
Now of course F4D4 applies that's F2.3 in the current BCA and F4D4 or F2.3 in NCC 2019 sets
out some circumstances where you don't have to provide separate facilities for males and females,
these are the only reasons where you might have a single ambulant facility a single sex ambulant
facility but other than these circumstances outlined on the slide you must have at least
two ambulant facilities, one for males and one for females in circumstances where the building
is required to have ambulant facilities. Now the last change to cover in Part F is in Specification 28
which is currently known as Specification F5.2 under NCC 2019 that's a table of forms of
construction that meet specified sound insulation ratings, now Spec 5.2 has been in the BCA since
its first edition BCA 1988 and this particular table row, this particular item has been in there
since 1988 since BCA88 19 mm tongue and groove boards, not yellow tongue we're talking 19 mm
floorboards with insulation placed as shown in the specification here. Now not many people have
used this particular table row inside the last decade, what I'm saying is that Spec F5.2 has
been modernized we've included more modern forms of construction like this one here. We've taken out
the floorboards and replaced it with timber flooring that's that's current conventional construction.
Now of course just as it's always been you don't have to use Specification 28 you're welcome to
use other systems that are shown to comply through lab testing and a manufacturer might demonstrate
that for their floor systems or of course you can use one of the verification methods.
That's all we're covering in this video for Part F but I can't leave
Part F without a watch this space note for condensation management.
At the time of the recording of this video final sign off was yet to occur for condensation
management provisions so therefore I'm not able to provide you an update in this video. However we do
plan to support these provisions with education so please keep an eye on our website abcb.gov.au.