Part J3 Elemental provisions for a sole-occupancy unit of a Class 2 building or a Class 4 part of a building

(1) Where a Deemed-to-Satisfy Solution is proposed, Performance Requirements J1P1 to J1P4 are satisfied by complying with—

1. J2D2; and
2. J3D2 to J3D15; and
3. J4D2 to J4D7; and
4. J5D2 to J5D8; and
5. J6D2 to J6D13; and
6. J7D2 to J7D9; and
7. J8D2 to J8D4; and
8. J9D2 to J9D5.

(2) Where a Performance Solution is proposed, the relevant Performance Requirements must be determined in accordance with A2G2(3) and A2G4(3) as applicable.

The Deemed-to-Satisfy Provisions of this Part apply to building elements forming the external building fabric and domestic services of a sole-occupancy unit of a Class 2 building and a Class 4 part of a building.

(1) The sole-occupancy units of a Class 2 building or a Class 4 part of a building must—

1. for reducing the heating or cooling loads—
   1. collectively achieve an average energy rating of not less than 7 stars, including the separate heating and cooling load limits; and
   2. individually achieve an energy rating of not less than 6 stars, including the separate heating and cooling load limits; and
2. for thermal breaks, comply with J3D5 and J3D6; and
3. for compensating for a loss of ceiling insulation, other than where the house energy rating software has compensated for a loss of ceiling insulation, comply with Table J3D7w; and
4. for general thermal construction, comply with J4D3; and
5. for floor edge insulation, comply with J3D10(3), J3D10(5) and J3D10(6); and
6. for building sealing, comply with Part J5.

(2) Energy ratings referred to in (1)(a)(i) and (ii) must be achieved using—

1. house energy rating software; and
2. the load limits specified in the ABCB Standard for NatHERS Heating and Cooling Load Limits.

(1) Ceiling fans must be installed in accordance with Table J3D4 in—

1. climate zones 1, 2 and 3; and
2. climate zone 5 in New South Wales and Queensland.

(2) Ceiling fans required by (1) must—

1. be permanently installed; and
2. have a speed controller.

(1) A roof that—

1. has metal sheet roofing directly fixed to metal purlins, metal rafters or metal battens; and
2. does not have a ceiling lining or has a ceiling lining fixed directly to those metal purlins, metal rafters or metal battens,

must have a thermal break, consisting of a material with an R-Value of greater than or equal to R0.2, installed between the metal sheet roofing and its supporting metal purlins, metal rafters or metal battens.

(2) The requirements of (1) do not apply to roofs constructed using insulated sandwich panels.

(1) A metal-framed wall that forms part of the building envelope 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 between the external cladding and the metal frame if the wall—

1. does not have a wall lining or has a wall lining that is fixed directly to the same metal frame; and
2. is clad with weatherboards, fibre-cement or the like, or metal sheeting fixed to a metal frame.

(2) The requirements of (1) do not apply to walls constructed using insulated sandwich panels.

(1) Roof and ceiling insulation must achieve the minimum R-Value—

1. in climate zone 1, in accordance with Tables J3D7a, J3D7b and J3D7c as applicable; and
2. in climate zone 2, in accordance with Tables J3D7d, J3D7e and J3D7f as applicable; and
3. in climate zone 3, in accordance with Tables J3D7g, J3D7h and J3D7i as applicable; and
4. in climate zone 4, in accordance with Tables J3D7j, J3D7k and J3D7l as applicable; and
5. in climate zone 5, in accordance with Tables J3D7m, J3D7n and J3D7o as applicable; and
6. in climate zone 6—
   1. R3.5; or
   2. if the roof contains reflective insulation, R3.0; and
7. in climate zones 7 and 8, in accordance with Tables J3D7p, J3D7q and J3D7r as applicable.

(2) Reflective insulation installed to comply with (1) must—

1. have a surface emittance of not more than 0.05; and
2. be adjacent to a roof space of not less than 20 mm; and
3. in climate zones 3 to 8, be downward facing.

(3) The thermal bridging in a metal-framed roof must be addressed as follows—

1. for a pitched roof with a horizontal ceiling—
   1. achieving the Total R-Value in Table J3D7s, calculated using a method that accounts for the effects of thermal bridging; or
   2. increasing the R-Value of the insulation between the ceiling frames by R0.5 more than the R-Value derived from (1); or
   3. adding a continuous ceiling insulation layer with a minimum R-Value of R0.13 above or below the ceiling joists or the bottom chords of the trusses; or
   4. achieving the required ceiling R-Value derived from (1) by stacking two layers of insulation immediately on top of each other, such that the top layer is orientated to cover the ceiling joists or bottom chord of the trusses and has an R-Value of at least R0.5; or
2. for a flat, skillion or cathedral roof—
   1. achieving the Total R-Value in Table J3D7t, calculated using a method that accounts for the effects of thermal bridging; or
   2. complying with Table J3D7u.

(4) Where F8D5(1) applies, continuous insulation placed above the primary insulation layer to mitigate thermal bridging must have a vapour permeance of not less than that of the primary insulation layer.

(5) Where, for operational or safety reasons, the area of ceiling insulation required is reduced, the loss of insulation must be compensated for in accordance with Table J3D7w.

(6) Where the ceiling insulation required by (1) to (5) has an R-Value—

1. greater than R3.0 and less than or equal to R4.5, it may be reduced to R3.0 within 450 mm of an external wall; or
2. greater than R4.5, it may be reduced to R3.0 within 450 mm of an external wall, provided all other required ceiling insulation is increased by R0.5.

(7) The requirements of (1) to (6) do not apply to roofs constructed using insulated sandwich panels.

(8) Roofs constructed using insulated sandwich panels must achieve the minimum Total R-Value in Table J3D7x.

(9) In climate zones 1 to 5, the solar absorptance of the upper surface of a roof must not be more than 0.64.

(1) The Total R-Value of an external wall—

1. in climate zones 1, 2, 3, 5 and 6—
   1. where the ratio of the area of opaque external walls to the floor area of the sole-occupancy unit is less than 20%, must be at least R1.15; and
   2. where the ratio of the area of opaque external walls to the floor area of the sole-occupancy unit is greater than or equal to 20% but less than 35%, must be at least R2.04; and
   3. where the ratio of the area of opaque external walls to the floor area of the sole-occupancy unit is greater than or equal to 35%, must be at least R2.24; and
2. in climate zones 4, 7 and 8, must be at least R2.24.

(2) The Total R-Value of an external wall must be determined in accordance with—

1. for a spandrel panel in a curtain wall system, in accordance with Specification 38; and
2. for all other walls, in accordance with AS/NZS 4859.2.

(3) The solar absorptance of an external wall must—

1. in climate zones 1 to 6, be in accordance with Table J3D8a; and
2. in climate zones 7 and 8, be in accordance with Table J3D8b.

(1) The Total System U-Value of wall-glazing construction that forms part of the external building fabric must not be greater than—

1. in climate zones 1 to 5, U2.2; or
2. in climate zone 6, U2.0; or
3. in climate zones 7 and 8, U1.4.

(2) The Total System U-Value of wall-glazing construction that forms part of the external building fabric must be calculated in accordance with Specification 37.

(3) Wall components of wall-glazing construction must achieve a minimum Total R-Value of—

1. where the wall is less than 80% of the area of the wall-glazing construction, R1.0; or
2. where the wall is 80% or more of the area of the wall-glazing construction, the value specified in Table J4D6a for a Class 3 building.

(4) In climate zones 1 to 6, the solar admittance of externally facing wall-glazing construction must be not greater than that shown in Table J3D9.

(5) In climate zones 7 and 8, glazing in a wall-glazing construction must have a Total System SHGC of at least 0.4.

(6) The solar admittance of a wall-glazing construction must be calculated in accordance with Specification 37.

(7) The solar absorptance of an external wall must be in accordance with J3D8(3).

(1) Where a sole-occupancy unit of a Class 2 building or a Class 4 part of a building has a concrete floor above an unenclosed carpark, undercroft, or the like, underfloor insulation must be installed with an R-Value at least—

1. in climate zone 2 and climate zones 5 to 8, R2.0; and
2. in climate zones 3 and 4, R1.5.

(2) Where a sole-occupancy unit of a Class 2 building or Class 4 part of a building has a concrete floor above an enclosed carpark, undercroft or the like, underfloor insulation must be installed with an R-Value at least—

1. in climate zone 2, R0.5; and
2. in climate zones 4 and 5, R1.0; and
3. in climate zone 6, R1.5; and
4. in climate zones 7 and 8, R2.0.

(3) A concrete slab-on-ground with an in-slab or in-screed heating or cooling system must have insulation with an R-Value at least 1.0 installed around the vertical edge of tis perimeter.

(4) Except for a waffle-pod slab—

1. in climate zones 6 and 7—
   1. insulation with an R-Value of at least 0.64 must be installed around the vertical edge of its perimeter; and
   2. insulation with an R-Value of at least 0.64 must be installed underneath the slab; and
2. in climate zone 8—
   1. insulation with an R-Value of at least 1.0 must be installed around the vertical edge of its perimeter; and
   2. insulation with an R-Value of at least 2.0 must be installed underneath the slab.

(5) Insulation required by (3), (4)(a)(i) and (4)(b)(i) must—

1. be water resistant; and
2. be continuous from the adjacent finished ground level—
   1. to a depth of not less than 300 mm; or
   2. for at least the full depth of the vertical edge of the concrete slab-on-ground.

(6) The requirements of (3) do not apply to an in-screed heating or cooling system used solely in a bathroom, amenity area or the like.

(1) In climate zones 2 to 8, the ratio of the conductance (C_U) and solar heat gain (C_SHGC) of the glazing of each storey, including any mezzanine, of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building must—

1. not exceed the allowance obtained from Table J3D11a; and
2. be calculated in accordance with the following formula:

(2) In the formula at (1)(b)—

1. $A_{1,2,etc}$

   = the area of each glazing element; and

2. $U_{1,2,etc}$

   = the Total System U-Value of each glazing element; and

3. $SHG{C}_{1,2,etc}$

   = the Total System SHGC for each glazing element, not exceeding 0.7; and

4. $E_W{}_{1,2,etc}$

   = the winter exposure factor for each glazing element obtained from Table J3D11b, J3D11c, J3D11d, J3D11e, J3D11f or J3D11g; and

5. $B{C}_{1,2,etc}$

   = the bedroom conductance factor obtained from Table J3D11h, J3D11i, J3D11j, J3D11k, J3D11l or J3D11m; and

6. $O{C}_{1,2,etc}$

   = the orientation sector conductance factor obtained from Table J3D11n; and

7. $R_{W1,2,etc}$

   = the room type factor obtained from Table J3D11h, J3D11i, J3D11j, J3D11k, J3D11l or J3D11m; and

8. $B{S}_{W1,2,etc}$

   = the bedroom solar heat gain factor obtained from Table J3D11h, J3D11i, J3D11j, J3D11k, J3D11l or J3D11m; and

9. $F_{W1,2,etc}$

   = the frame factor obtained from Table J3D11o, J3D11p, J3D11q, J3D11r, J3D11s or J3D11t for each glazing element; and

10. $H_{W1,2,etc}$

    = the floor factor obtained from Table J3D11h, J3D11i, J3D11j, J3D11k, J3D11l or J3D11m for each glazing element.

(3) For the purpose of J3D11—

1. orientation sectors must be determined in accordance with Figure 13.3.2a of the ABCB Housing Provisions; and
2. P/H must be determined in accordance with Figure S37C7; and
3. For P/H between those in Tables J3D11b, J3D11c, J3D11d, J3D11e, J3D11f and J3D11g, either use the next highest P/H or interpolate.

(1) In climate zones 1 to 7, the aggregate solar heat gain of the glazing in each storey, including any mezzanine, of a sole-occupancy unit of a Class 2 building or a Class 4 part of a building must—

1. not exceed the allowance resulting from multiplying the floor area of the storey, including any mezzanine, measured within the enclosing walls, by the constant C_SHGC obtained from Table J3D12a; and
2. be calculated in accordance with the following formula:

(2) In the formula at (1)(b)—

1. $A_{1,2,etc}$

   = the area of each glazing element; and

2. $SHG{C}_{1,2,etc}$

   = the Total System SHGC for each glazing element, not exceeding 0.7; and

3. $E_{S1,2,etc}$

   = the summer exposure factor for each glazing element obtained from Table J3D12b, J3D12c, J3D12d, J3D12e, J3D12f, J3D12g or J3D12h.

4. $R_{S1,2,etc}$

   = the factor obtained from Table J3D12i or Table J3D12j for each glazing element located in a bedroom or room which is not a conditioned space; and

5. $F_{S1,2,etc}$

   = the frame factor obtained from Table J3D12i or Table J3D12j for glazing element; and

6. $H_{S1,2,etc}$

   = the floor factor obtained from Table J3D12i or Table J3D12j for each glazing element.

(3) For the purpose of J3D12—

1. orientation sectors must be determined in accordance with Figure 13.3.2a of the ABCB Housing Provisions; and
2. P/H must be determined in accordance with Figure S37C7; and
3. for P/H between those shown in Tables J3D12b, J3D12c, J3D12d, J3D12e, J3D12f, J3D12g, J3D12h, J3D12i and J3D12j, either use the next highest P/H or interpolate.

Where shading is required to comply with J3D11 or J3D12, it must—

1. be provided by an external permanent projection, such as a verandah, balcony, fixed canopy, eaves, shading hood or carport, which—
   1. extends horizontally on both sides of the glazing for a distance greater than or equal to the projection distance P in Figure S37C7; or
   2. provide the equivalent shading to (i) with a reveal or the like; or
2. be provided by an external shading device, such as a shutter, blind, vertical or horizontal building screen with blades, battens or slats, which—
   1. is capable of restricting at least 80% of the summer solar radiation; and
   2. if adjustable, is readily operated either manually, mechanically or electronically by the building occupants.

(1) The net equivalent energy usage of a sole-occupancy unit of a Class 2 building or Class 4 part of a building, calculated in accordance with (a), must not exceed the allowance calculated in accordance with (b)—

1. $(A\times E_E)+E_P+E_S-E_R$

   , where—

   1. $A$

      = the floor area factor obtained from multiplying the total floor area by the adjustment factor in Table J3D14a; and

   2. $E_E$

      = the main space conditioning and main water heater efficiency factor obtained from the ABCB Standard for Whole-of-Home Efficiency Factors; and

   3. $E_P$

      = the swimming pool pump energy usage in (2); and

   4. $E_S$

      = the spa pump energy usage in (3); and

   5. $E_R$

      = the installed capacity of on-site photovoltaics apportioned to the sole-occupancy unit of a Class 2 building or Class 4 part of a building (kW); and

2. $A\times E_F$

   , where—

   1. $A$

      = the floor area factor obtained from multiplying the total floor area by the adjustment factor in Table J3D14a; and

   2. $E_F$

      = the energy factor obtained from Table J3D14b.

1. $E_P$

   = the swimming pool pump energy usage; and

2. $V$

   = the volume of the swimming pool to the nearest 1000 litres; and

3. $FP$

   = the swimming pool pump factor in Table 13.6.2c of the ABCB Housing Provisions.

1. $ES$

   = the spa pump energy usage; and

2. $V$

   = the volume of the spa to the nearest 100 litres; and

3. $FSB$

   = the spa pump factor in Table 13.6.2d of the ABCB Housing Provisions.

A sole-occupancy unit of a Class 2 building or a Class 4 part of a building must achieve a whole-of-home rating of not less than 50 using house energy rating software.