THERMAL ISOLATOR & SECTION J0.5 REQUIREMENTS
This technical note provides details of the Nvelope framing system, the Nvelope Thermal Gasket, its R-value and its relevance to the NCC 2019 Section J.
Requirements of NCC 2019 Section J0.5(c).
As can be seen in J0.5 (a) a thermal break is required only where “a wall lining that is fixed directly to the same metal frame” is present.
J0.5 Wall thermal breaks
For compliance with J0.2(c), a wall that—
(a) does not have a wall lining or has a wall lining that is fixed directly to the same metal frame; and
(b) has lightweight external cladding such as weather-boards, fibre-cement or metal sheeting fixed to a metal frame, must have a thermal break, consisting of a material with an R-Value of not less than R0.2, installed at all points of contact
As can be seen in J0.5 (a) a thermal break is required only where “a wall lining that is fixed directly to the same metal frame” is present.
When using the Nvelope system, there is no requirement for a thermal break under Section J0.5(c) because there is no single metal framing member of the Nvelope system that directly connects the wall cladding and the wall lining.