This video from the 2022 NCC Seminars discusses Section C Fire resistance from NCC 2022 Volume One.
Hello my name's Graham Moss this video is an update on
the changes in NCC 2022 for fire resistance in Section C.
First change to show you is C2D10 Non-combustible building elements, this is currently known as C1.9
in NCC 2019. It's been structured this way for a long time you've got (a) and (b), which set out things
that have to be non-combustible: external walls, shafts, flooring of lift pits and things like that.
You've also got subclause (c) which points to Spec C1.1 for load-bearing internal walls and also
load-bearing firewalls and the combustibility requirements found in that specification.
You've also got (d), which has a small number of concessions from the non-combustibility requirements of (a) and (b).
Now currently in 2019 that list has seven things in it there's: gaskets, caulking sealants
and a few other things, there's seven things in that list and then you have C1.9(e) now this
is a concession list, but it's a concession of things that can be used despite being
combustible they can be used where things need to be non-combustible for purposes of (a) and (b) but of
course anywhere in the NCC. So C1.9(d) is a limited concession list but C1.9(e) is a concession list
for everything in the NCC and in the building code Volume One that needs to be non-combustible.
First change I want to show you for 2022 is that what's currently C1.9(e) is pushed down to
the new subclause subclause (6) to make space for a new subclause (5). Now this new subclause (5) is a list
of materials that can be used wherever something needs to be non-combustible, because really they
are non-combustible. So apparently test labs have been getting phone calls from manufacturers saying
can you do a combustibility test on our bricks we're being asked for a certificate.
Now just for the record the BCA has never required that you'd need to go to an accredited testing
laboratory to do a combustibility test for a brick wall or any wall for that matter. Now of course it
might be chosen to use to to get a combustibility test for reasons of evidence of suitability
and that's a good idea for something which is a wall system that is not known, however
the BCA has never actually required it. For some things yes so for instance where a wall needs to
achieve a fire resistance level and a meet falls outside the specifications found inside the BCA
and it's therefore is a tested system well yes and the BCA is requiring that it
accuracy testing laboratory be used for those circumstances but we've never actually asked
for proof of non-combustibility for a brick wall. Now regardless of this we have inserted a new list
of concessions in C2D10 subclause (5) and it's not just bricks, bricks are there in C for Masonry,
but you can see this list of things which are non-combustible or non-combustible in nature
these are things have been included in NCC 2022 for a general as a general concession for reasons
similar to that I've described for Masonry. Now that's the new C2D10(5) for material concessions,
next I want to talk about C1, what's currently C1.9(d), that list of things
which can be combustible but don't have to comply with C1.9(a) and (b). Now you may recall there were
seven things in that list: gaskets, caulking, sealants, termite protection and other things.
That list has grown now to 21 items, I say 21 because 6b there is a new system, external wall
system thermal brakes, now because glazing systems thermal brakes for glazing systems are currently
receive a concession but basically from 6b onwards these are all new concessions included in C2D10.
The next change to show you is C2D14 ancillary elements, this provision has received
some changes for NCC 2022 it's currently known as C1.14 in NCC 2019 now C1.14 is that provision
that sets out things that can be attached to an external wall or be found within an external wall
and it's the reason why downpipes for instance for Type A and Type B buildings can be combustible.
There are some minor changes for NCC 2022 including some additional concessions but also some
clarifications, one of those concessions is to do with these things air conditioning condenser units
outside like this on Class 2's and 3's. Now these need to connect to the split system inside
through the external wall and a lot of certifiers have been requiring performance solutions because
the penetration sleeve, the penetration insulation is combustible and found inside the external wall
so for 2022 C2D14 has new concession that allows the insulation for the penetration
sleeve to be combustible but also to have other combustible items for service penetrations.
As for clarifications we've included a new note that points out that this is allowed that is an
air conditioning condenser unit despite having combustible parts can be mounted on external
walls of Type A and Type B buildings. Another clarification found in C2D14 is about something
that we call in the office the kitchen cabinet issue. Here we have a high-rise apartment it's
Type A construction we're looking at the inside of some external walls here, we've got a kitchen
placed against one of the external walls and we've got some windows leading onto the balcony
which is the other external wall. Now those kitchen cabinets attach the inside of that external wall
to those kitchen cabinets have to be non-compostable but what if we put some
internal blinds on those windows do those internal blinds have to be non-combustible? Well under 2019
some people say they do because C1.14 talks about ancillary elements that are fixed to the internal
parts of an external wall those kitchen cabinets are hanging off the internal frame with the
external wall and so people will be saying that yes these things need to be non-combustible. In the
same way that blinds if they were attached to that external wall would be attached to the internal
parts of that external wall to the framing, etc. Now C1.14 has never intended to apply to things inside
the building in this way that's why we have C1.10 to cover the internal fire hazard properties.
It's things that are inside the wall itself that's what we're interested in and that's why
the provision talks about the internal parts of an external wall, but we've never intended
for this provision to apply for things inside the wall, inside the building, like the kitchen
cabinets and the blinds. So we've changed C1.14 to include this limitation just to make it clear that
this provision does not apply to things that are fixed on the inside of the external wall like the
kitchen cabinets, the internal blinds, anything like that. It was never meant to and this edition
for NCC 2022 makes that clear, now some may say that a kitchen cabinet attached to the internal
parts, say the frame of the external wall, is still something that's subject to C1.14 or now C2D14
however it's the opinion of the ABCB office that that kitchen cabinet that might be
attached to blocking or framework inside the external wall, is still a kitchen cabinet that
is installed or attached to the internal face or to the lining of the external wall
it's still fixed to that lining, despite being screwed into the blocking or the frame behind
therefore the limitation applies and kitchen cabinets are excluded from this provision.
Next change is a new provision C2D15 fixing of bonded laminated cladding panels, now we're not
just talking about aluminum panels like honeycomb panels, this is a provision that applies to any
cladding panel on a Type A or Type B building that is a panel that is bonded and laminated.
Now in a nutshell what this provision is requiring that the fixing must be mechanical
for example a cassette style fixing. Tape or glue fixing is not allowed on account of C2D15.
Now you can still use adhesives in addition to mechanical fixing so you can tape it in place
and then screw it in but you can't use the tape or glue as the sole fixing. This is because mechanical
fixing will do a better job of preventing the panel from coming away in a building fire.
Now note that this provision has some concessions in subclause (2).
Since this new fixing provision doesn't apply to the cladding panels that are listed in
subclause (2), now this is not a free kick, this concession list is not a way of saying hey you
can go and use glue or how you can just use some double-sided tape for these particular panels.
In fact it's very unlikely that if you tape fix these things say fiber cement
sheet to an external wall that it would meet the requirements of Section B and that's why
we've got this explanatory information box which points out that there's other provisions of the
NCC that apply to cladding panels and it's very very unlikely that you'll meet those
particular requirements simply using tape or glue for fixing those items listed in subclause (2).