Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Supported by: Step by Step Application of BCA Provisions - Climate Zone 2

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Proposed Dwelling  New house is to be constructed in Robina  Construction:  slab-on-ground  brick veneer external walls  pitched tile roof  Habitable rooms are to be air-conditioned

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Proposed Dwelling - Floor Plan & Elevations

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office  From Climate Zone Table & Map (Table & Figure 1.1.4) Step 1 - Determine Climate Zone Gold Coast is in Climate Zone 2

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Step 2 - Determine Requirements for Building Fabric Step 2.1 Roof Requirements  Step A - to determine total R-value required for roof, refer to:  BCA Clause  BCA Table

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Extract of BCA Table This shows that in Climate Zone 2, the roof is required to have a total R-value of R2.2 Step Building Fabric - Roof

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Step Building Fabric - Roof  Step B ‑ Refer to BCA Figure to determine insulation required  this is determined by subtracting the inherent R-value for the roofing materials from the total R-value required

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Extract of BCA Figure R-value to be added to the roof Total R-value required Roof construction type Inherent R-value of roof & ceiling materials

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Step Building Fabric - Roof Step 2.1 Outcome -  In climate zone 2 install R1.5 insulation in roof It is possible to use a combination of insulation materials such as bulk insulation, foil (RFL/RBM) etc with various system R-values to achieve the BCA required R value Design Alert!

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office  Step A - to determine total R-value required for external walls, refer to:  BCA Clause  BCA Table Step Building Fabric - Walls

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Step Building Fabric - Walls This shows that in Climate Zone 2, the walls are required to have total R-value of R1.0 Extract of BCA Table

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office  Step B ‑ Refer to BCA Figure to determine the added insulation required  this is done by subtracting the inherent R- value for the wall materials from the total R-value required Step Building Fabric - Walls

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Extract of BCA Figure Added R-value required to walls R-value of wall materials Total R-value required Wall construction type

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Step Building Fabric - Walls Step 2.2 Outcome -  In climate zone 2 install R0.46 insulation This can be achieved with an RBM

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office  Refer to BCA Clause  No requirements in Zone 2 Step Building Fabric - Floors

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office  Refer to Clause options for compliance:  Separate garage from dwelling with a DTS complying wall  Consider garage as part of dwelling  Consider garage in total to provide the required level of thermal resistance Step Building Fabric - Garage Treatment.

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office  Dividing wall between garage and house is a timber stud wall lined with  cement sheet on garage side  plaster board on dwelling side Step Building Fabric - Garage Treatment. Wall to comply with DTS Provisions  Easiest case to achieve compliance in this case is option 1 - separate garage from dwelling

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office  Step A - to determine total R-value required for external walls, refer to:  BCA Clause  BCA Table Step Building Fabric - Garage Treatment.

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Extract of BCA Table Step Building Fabric - Garage Treatment. As previously, this shows that in Climate Zone 2, external walls are required to have total R-value of R1.0

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office  Step B ‑ Refer to BCA Figure to determine insulation required  this is determined by subtracting the inherent R-value for the wall materials from the total R-value required Step Building Fabric - Garage Treatment.

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Extract of BCA Figure Added R-value required in wall R-value of wall materials Total R-value required Wall construction type is now:

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Step Building Fabric - Garage Treatment.  Consideration needs to also be given to height of dividing wall  does it need to extend up to underside of roof covering?  does it only need to extend up to the ceiling? Clause requires bulk insulation to abut other insulation or building members providing insulating to ensure that there are no voids

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Step Building Fabric - Garage Treatment. Wall extending to underside of roof insulation Wall extending to underside of ceiling insulation Insulation material Garage OROption 1Option 2 GarageDwelling

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Step 2.4 Outcome -  Install R0.6 insulation in separating wall between garage and dwelling  Wall to extend to level of roof/ceiling insulation Step Building Fabric - Garage Treatment.

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office  Step A - Determine window construction  In this example windows are timber framed with single clear glass Step 3 - External Glazing.  Step B - Refer to BCA Figure to determine orientation sectors

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Step 3 - External Glazing Determining Orientation North BCA North BCA West BCA South BCA East

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office  Step C - Refer to BCA Table for :  maximum floor area to window ratios  shading requirements Step 3 - External Glazing.

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Extract of BCA Table From plan, the dwelling has no eave overhang This means that the maximum total area of glazing to the dwelling is to be 29% of floor area. From plan, windows are timber frame with single clear glass Step 3 - External Glazing.

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office  Dwelling floor area is 160 m 2 therefore, the maximum overall window area allowance is:  46.4 m 2 (ie. 29% of dwelling floor area)  North facing windows also receive a concession and only half of their area need be counted in calculations Step 3 - External Glazing.

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Step 3 - External Glazing. Area of windows in North sector is sq m however, only 50% of this area needs to be counted Window/floor area ratio is 19.5% & therefore, complies with BCA requirements

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Step 3 Outcome -  Window/floor area ratio of proposed dwelling is 19.5% calculated  Complies with BCA Table  For climate zone 2 (max 29%)  No shading required Step 3 - External Glazing.

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office  3 external doors Step Building Sealing External Doors  To be fitted with weather seals (all round)  Assume all habitable rooms are airconditioned (not evaporative cooler)

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Step Building Sealing Windows  Windows complying with AS 2047 are deemed to provide adequate sealing

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office  From documents, the bathroom is not air-conditioned by the central ducted system  Therefore, the bathroom exhaust fan does not requires a damper to be fitted Step Building Sealing Exhaust Fans

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office  Skirtings, architraves and cornices are deemed to provide an adequate level of sealing Step Building Sealing Construction of Floor, Walls & Roof

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Step 5 - Air Movement Step Ventilation Requirements  Step A - Refer to BCA Clause to determine when required  Step B - Refer to BCA Table to determine % of ventilation openings

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office  Ventilation required:  All rooms - 10%  Design incorporates:  no ceiling fans Step Air Movement Ventilation Requirements No ceiling fan - Openings to be at least 10%

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Step Air Movement Breeze Path Requirements  Step A - Refer to BCA Clause  General breeze path requirements:  can not pass through more than 2 openings  internal openings must be at least 1.5 m 2  20 m max between openings in external walls  breeze paths can serve multiple rooms

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Step Air Movement Breeze Path Requirements  Step 5.2 outcomes:  floor plan has breeze paths that comply with BCA requirements

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Step 6 - Domestic Services HWS installation  Only applies to storage HWS  Proposed dwelling has:  a gas storage HWS against the building outside the laundry  1 m of piping before entering wall

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Step 6 - Domestic Services HWS installation Step Piping to and from HWS  Refer to AS Table 3.9  Piping to have insulation as follows:  Cold water - for 500 mm before heater  Hot water – until it enters wall  As it is external in “Region A”- R mm closed cell polymer

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Step HWS Heat Trap  Refer to AS all HWS systems to have a heat trap installed Step 6 - Domestic Services HWS installation

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office  In example, air conditioning/heating ductwork is located in ceiling space  Step Refer to BCA Clause and Table Step 6 - Domestic Services Heating & Cooling Ductwork

Building Australia’s Future Energy Efficiency Introductory Awareness Training AUSTRALIAN Greenhouse Office Step 6 - Domestic Services Heating & Cooling Ductwork  Ductwork is to have:  R1.0 insulation  all joins sealed  an outer sleeve installed to protect the insulation from damage