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Step by Step Application of BCA Provisions - Climate Zone 2

Step by Step Application of BCA Provisions - Climate Zone 2. 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. Proposed Dwelling - Floor Plan & Elevations.

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Step by Step Application of BCA Provisions - Climate Zone 2

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  1. Step by Step Application of BCA Provisions - Climate Zone 2

  2. Proposed Dwelling • New house is to be constructed inRobina • Construction: • slab-on-ground • brick veneer external walls • pitched tile roof • Habitable rooms are to be air-conditioned

  3. Proposed Dwelling - Floor Plan & Elevations

  4. Gold Coast is in Climate Zone 2 Step 1 - Determine Climate Zone • From Climate Zone Table & Map (Table 1.1.2 & Figure 1.1.4)

  5. 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 3.12.1.2 • BCA Table 3.12.1.1

  6. Step 2.1 - Building Fabric - Roof This shows that in Climate Zone 2, the roof is required to have a total R-value of R2.2 Extract of BCA Table 3.12.1.1

  7. Step 2.1 - Building Fabric - Roof • Step B ‑ Refer to BCA Figure 3.12.1.2 to determine insulation required • this is determined by subtracting the inherent R-value for the roofing materials from the total R-value required

  8. Total R-value required Roof construction type Inherent R-value of roof & ceiling materials R-value to be added to the roof Extract of BCA Figure 3.12.1.2

  9. Design Alert! 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 Step 2.1 - Building Fabric - Roof Step 2.1 Outcome - • In climate zone 2 install R1.5 insulation in roof

  10. Step 2.2 - Building Fabric - Walls • Step A - to determine total R-value required for external walls, refer to: • BCA Clause 3.12.1.4 • BCA Table 3.12.1.3

  11. Step 2.2 - 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 3.12.1.3

  12. Step 2.2 - Building Fabric - Walls • Step B ‑ Refer to BCA Figure 3.12.1.3 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

  13. Wall construction type Total R-value required R-value of wall materials Added R-value required to walls Extract of BCA Figure 3.12.1.3

  14. Step 2.2 - Building Fabric - Walls Step 2.2 Outcome - • In climate zone 2 install R0.46 insulation This can be achieved with an RBM

  15. Step 2.3 - Building Fabric - Floors • Refer to BCA Clause 3.12.1.5 - • No requirements in Zone 2

  16. Step 2.4 - Building Fabric - Garage Treatment. • Refer to Clause 3.12.1.6 - 3 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

  17. Wall to comply with DTS Provisions Step 2.4 - Building Fabric - Garage Treatment. • Dividing wall between garage and house is a timber stud wall lined with • cement sheet on garage side • plaster board on dwelling side • Easiest case to achieve compliance in this case is option 1 - separate garage from dwelling

  18. Step 2.4 - Building Fabric - Garage Treatment. • Step A - to determine total R-value required for external walls, refer to: • BCA Clause 3.12.1.4 • BCA Table 3.12.1.3

  19. Step 2.4 - 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 Extract of BCA Table 3.12.1.3

  20. Step 2.4 - Building Fabric - Garage Treatment. • Step B ‑ Refer to BCA Figure 3.12.1.3 to determine insulation required • this is determined by subtracting the inherent R-value for the wall materials from the total R-value required

  21. Wall construction type is now: Total R-value required R-value of wall materials Added R-value required in wall Extract of BCA Figure 3.12.1.3

  22. Step 2.4 - Building Fabric - Garage Treatment. • Consideration needs to also be given to height of dividingwall • does it need to extend up to underside of roof covering? • does it only need to extend up to the ceiling? Clause 3.12.1.1 requires bulk insulation to abut other insulation or building members providing insulating to ensure that there are no voids

  23. Step 2.4 - Building Fabric - Garage Treatment. Step 2.4 Outcome - • Install R0.6 insulation in separating wall between garage and dwelling • Wall to extend to level of roof/ceiling insulation

  24. Step 3 -External Glazing. • Step A - Determine window construction • In this example windows are timber framed with single clear glass • Step B - Refer to BCA Figure 3.12.2.1 to determine orientation sectors

  25. Step 3 - External GlazingDetermining Orientation North BCA North BCA East BCA West North BCA South

  26. Step 3 -External Glazing . • Step C - Refer to BCA Table 3.12.2.1 for : • maximum floor area to window ratios • shading requirements

  27. Extract of BCA Table 3.12.2.1 From plan, the dwelling hasno eave overhang From plan, windows are timber frame with single clear glass This means that the maximum total area of glazing to the dwelling is to be 29% of floor area. Step 3 -External Glazing .

  28. Step 3 -External Glazing. • Dwelling floor area is 160 m2 therefore, the maximum overall window area allowance is: • 46.4 m2 (ie. 29% of dwelling floor area) • North facing windows also receive a concession and only half of their area need be counted in calculations

  29. Area of windows in North sector is 12.67 sq m however, only 50% of this area needs to be counted Step 3 -External Glazing. Window/floor area ratio is 19.5% & therefore, complies with BCA requirements

  30. Step 3 -External Glazing. Step 3 Outcome - • Window/floor area ratio of proposed dwelling is 19.5% calculated • Complies with BCA Table 3.12.2.1 • For climate zone 2 (max 29%) • No shading required

  31. Step 4.1 - Building Sealing External Doors • 3 external doors • Assumeall habitable rooms are airconditioned (not evaporative cooler) • To be fitted with weather seals (all round)

  32. Step 4.2 - Building Sealing Windows • Windows complying with AS 2047 are deemed to provide adequate sealing

  33. Step 5 - Air Movement Step 5.1 - Ventilation Requirements • Step A - Refer to BCA Clause 3.12.4.1 to determine when required • Step B - Refer to BCA Table 3.12.4.1 to determine % of ventilation openings

  34. Step 5.1 - Air MovementVentilation Requirements No ceiling fan - Openings to be at least 10% • Design incorporates: • no ceiling fans • Ventilation required: • All rooms - 10%

  35. Step 5.2 - Air MovementBreeze Path Requirements • Step A - Refer to BCA Clause 3.12.4.2 • General breeze path requirements: • can not pass through more than 2 openings • internal openings must be at least 1.5 m2 • 20 m max between openings in external walls • breeze paths can serve multiple rooms

  36. Step 5.2 - Air MovementBreeze Path Requirements • Step 5.2 outcomes: • floor plan has breeze paths that comply with BCA requirements

  37. Step 6 - Domestic ServicesHWS installation • Only appliestostorageHWS • Proposed dwelling has: • a gas storage HWS against the building outside the laundry • 1 m of piping before entering wall

  38. Step 6 - Domestic ServicesHWS installation Step 6.1 - Piping toand fromHWS • Refer to AS 3500.5 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”- R0.3- 13 mm closed cell polymer

  39. Step 6 - Domestic ServicesHWS installation Step 6.2 - HWS Heat Trap • Refer to AS 3500.3.38.3 - all HWS systems to have a heat trap installed

  40. Step 6 -Domestic ServicesHeating & Cooling Ductwork • In example, air conditioning/heating ductwork is located in ceiling space • Step 6.3 - Refer to BCA Clause 3.12.5.3 and Table 3.12.5.2

  41. Step 6 -Domestic ServicesHeating & Cooling Ductwork • Ductwork is to have: • R1.0 insulation • all joins sealed • an outer sleeve installed to protect the insulation from damage

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