This video from the 2022 NCC Seminars discusses Part 12.3 Attachment of framed decks and balconies to external walls of buildings using a waling plate from NCC 2022 Housing Provisions.
My name is Phil Finnimore from the Australian Building Codes Board and today I'm going to talk about some slight
changes to NCC Volume Two 2019 relevant to the attachment of frame decks to either:
timber framed external walls of houses or masonry single leaf reinforced walls.
So for NCC 2022 we've made some changes to the current provisions in 2019, particularly in
relation to the size of timber waling plates. You can see in this slide through the track changes
that we've crossed out the size timber of 190 by 45 and replace it with two options in capital (A)
and (B) there in 12.3.2 and that's 130 by 30, 140 rather by 35 millimeter profile or 90 by 35 with
the requisite stress grades. The reason this has been done is to respond to public comment that
said 190x45 was a size timber that was just too hard to achieve in the industry there was just no
way of sourcing that particular timber size. We've responded to that and given two options in
140 by 35 and 90 by 35, with those relevant stress grades. While doing that and as part of the proposal that
changed this particular provision we've added some fixing types that are more relevant in
use in the industry and they're set out there in 12.3.2(d)(ii) and that's for in external walls
that are timber frame, you can use number 14 type screws. We've also changed the diagrams that
support those particular provisions tidied them up a bit taken away the timber sizes so that we
just rely on the clauses and we've included for the waling plate connection to structural walls
at a concrete masonry, that are reinforced concrete masonry, with the use of chem sets.
This was not in 2019 but for 2022 there's a chem set solution it's used in a horizontal
application as it's shown in that particular diagram, we've added explanatory information
there just to draw your attention to the fact that if you're using this particular detail, a
chem set in a horizontal position you need to make sure you select the right type of chem set.