This video from the 2022 NCC Seminars discusses Part H4 Health and Amenity from NCC 2022 Volume Two.
My name is Phil Finnimore from the Australian Building Codes Board and today I'm going to talk about some provisions
in Part H4 of Volume Two relating to health and humanity and in particular wet areas.
There have been some changes but before we get into what the changes are there's a need
to talk about some history. History of the NCC going back to BCA 96 right up to BCA 2011, where
we had in Volume Two Deemed-to-Satisfy provisions that provided technical solution to wet areas,
that's showers and baths and bathrooms and toilet areas, and also the ability to use AS 3740 as a
Deemed-to-Satisfy solution as well. So we had up to 2011 a method of providing a Deemed-to-Satisfy
solution through reference to AS 3740 or the solution within the Volume Two DtS provisions.
That changed in 2012, where we maintained a requirement in the code through the tables in
Part 3.8.1 to say where particular areas needed to be waterproof and where particular areas need to
be made water resistant. Which then took you to the technical solution of 3740, so from 2012 to 2019
the NCC told you and tells you how and where to provide waterproofing and water resistance and the
technical solution was 3740. What we've done for NCC 2022 through the Housing Provisions have gone
back to what was in 2011 and reinserted the Deemed-to-Satisfy provisions in detail into Volume Two.
H4D2 and H4D3 are the relevant Deemed-to-Satisfy provisions in Volume Two for wet areas,
the construction outcomes, mainly whether something is waterproof or not, are contained in the
Housing Provisions Standard, that's Housing Provisions 2022. The construction details, that is the how
it is done, is where the option exists you can use AS 3740 or you can use the new details in
the Housing Provisions Standard. Noting that if you're using the Housing Provisions or 3740 you
must comply with clauses 10.2.1 to 10.2.6 and also clause 10.2.12 relating to floor wastes.
The layout for the Housing Provisions 2022 we've regrouped into particular sections
those things that relate to waterproofing systems, materials, water resistant surfaces
under systems and materials that's 10.2.6 to 10.2.10. Construction of wet areas that is those
things relating to wall and floor substrates, falls, floor surface materials as in a separate section.
Showers and baths have their own sections their clauses 10.2.14 to 19 and 10.2.20 for baths and spas.
The remainder of the provisions that relate to membrane installations, substrate
surfaces, bond breakers, all of the details about the makeup of waterproofing and water
resistant systems are contained within ancillary provisions under 10.2.21 and down to 10.2.32.
Something new for NCC 2022 and the Housing Provisions
if you have a handheld bidet spray installation in a WC area, note that there are provisions
there for floors and walls and floor junctions to be waterproof and or water
resistant to a particular dimension set out there in 10.2.5(3)(b) (i) and (ii).