insulation products for bca 2010 vol 1 section j energy

AIRAH

Insulation Products forBCA 2010 Vol 1 Section JEnergy EfficiencySteve FraneticTechnical Services Manager (NSW/ACT) September 2010

AIRAH NSW BCA 2010 Section J – Energy Efficiency

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PART J1 BUILDING FABRIC

Topics

• J1 Building Fabric Insulation

• J5.2 Ductwork Insulation

• J5.4 Pipe Insulation

• Improve the content of your specification

- to simply include the clause “to meet the requirements of BCA 2010 Part J” is NOT acceptable because many contractors are not BCA savy.


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J1.2 Thermal construction - general

• Insulation must comply with AS/NZS 4859.1

- Bulk insulation to be tested by a NATA certified lab

- Certification from an independent accredited organisation - not just a statement from a manufacturer or supplier


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• Insulation must be against stud member

- Specify 600mm wide insulation to fill steel stud cavity- Standard batts are 580mm wide for timber frame

• Form a continuous thermal barrier with ceilings, walls, floors

- Include insulation under box gutters

• Reflective insulation must be installed with the necessary airspace to achieve the required R-Value

- R-value of reflective insulation is calculated, based on specific criteriathat is particular to each building system


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• Bulk insulation must be installed so that it maintains its thickness, other than where it is compressed between cladding and supporting members

• Metal sheet roofing fixed to metal purlins that does not have a ceiling lining or has a ceiling lining fixed directly to those metal purlins, must have a thermal break with a material R-Value ≥ R0.2

- building blanket is a deemed-to-comply thermal break‘compressed bulk insulation is considered to achieve an R-Value of not less than 0.2’

BCA 2010 Vol 2, Part 3.12.1.2


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J1.3 Roof and ceiling construction

• Safety wire to be installed taut – 2mm gauge wire will not stretch

• Insulation spacer raises the roof from the purlin to maintain insulation loft


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• Climate Zone 4, 5 and 6 – Total R3.2 (downwards) achieved with 100mm (Material R2.5) foil faced blanket with 75mm insulation spacer

• Climate Zone 7 – Total R3.7 (upwards) achieved with 125mm (Material R3.5) foil faced blanket with 100mm insulation spacer


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• Climate Zone 8 – Total R4.8 (upwards) achieved with 75mm (Material R1.8) foil faced blanket incorporating 40mm high compressive strength (300kpa) extruded foam spacer and R3.0 batts in the ceiling

• Climate Zone 2 – Total R4.2 / 3.7 / 3.2 (downwards) achieved with 125mm (Material R3.5) foil faced blanket with 100mm insulation spacer


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• Climate Zone 4, 5 and 6 – Total R3.2 (downwards) achieved with 100mm (Material R3.0) 32kg/m3 foil (reflective or non-reflective) faced glasswool sheets


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J1.5 Walls

• Climate Zone 4, 5 and 6 – Total R2.8 (reduced by 0.5 with concessions – density and orientation or shading)

• Climate Zone 7 – Total R2.8 (reduced to Total R1.4 with concession – glazing)

achieved with 90mm (Material R2.5) HD Wall Batts


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J1.5 Walls

• Climate zone 8 – Total R3.8 achieved with 150mm (R4.2) HD Wall Batts

• Climate zone 2 – Total R3.3 achieved with 2 layers of 75mm (R1.8)(reduced by 0.5 with concessions – density and orientation or shading) (reduced by 0.5 with concession – surface solar adsorptance value ≤ 0.6)

• Lightweight external cladding fixed to a metal frame and has a wall lining that is fixed directly to the same metal frame must have a thermal break, consisting of a material with an R-Value of ≥ R0.2


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J1.6 Floors

• Total R2.0 suspended floor with enclosed conditioned space in zones 1-7achieved with 75mm (Material R2.3) 32kg/m3 foil (reflective or non-reflective) faced glasswool sheets

• Total R1.0 suspended floor with enclosed non-conditioned space (2, 5, 6)achieved with 50mm (Material R1.5) 32kg/m3 foil (reflective or non-reflective) faced glasswool sheets


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SPECIFICATION J5.2Ductwork Insulation

• Comply with AS/NZS 4859.1

• Minimum material R2.0 in climate zones 1-7 achieved with75mm thick - (R2.3) FI 32 Semi-Rigid or (R2.0) FI 22 Ductwrap

• Minimum material R1.2 in a conditioned space in climate zones 2 & 5with 38mm thick - (R1.2) FI 32 Semi-Rigid or 50mm (R1.5) FI 22 Ductwrap

• Minimum material R1.0 in a conditioned space in climate zones 4, 6 & 7with 38mm thick - (R1.2) FI 32 Semi-Rigid or 38mm (R1.1) FI 22 Ductwrap

• Minimum material R1.0 for flexible ductwork ≤ 3m in length


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SPECIFICATION J5.4Pipe Insulation

• Comply with AS/NZS 4859.1 (Material R-Value or formula)

• Be able to withstand the temperatures within the piping

• Heating water pipe - minimum material R1.0 / 1.1 / 1.2 / 1.5

• Cooling water pipe – too many to restate (R0.6 –R2.2)


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2.375mm

1.550mm

1.238mm

0.820mm

Material R-Value

GlasswoolThickness

0.625mm

0.832mm

1.038mm

0.419mm

0.313mm

0.29mm

Material R-Value

Rubber Thickness


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• Comply with AS/NZS 4859.1

As an alternative to test method ASTM C335, the Material R-value of preformed pipe insulation may be calculated as follows:The thermal conductivity shall be measured (Note: Conductivity varies with temperature)The following formula shall then be applied

R = (r2loge(r2/r1))/k

whereR = Material R-value of the preformed pipe insulation sectionr1 = inner radius of the pipe insulationr2 = outer radius of the pipe insulationk = thermal conductivity of the insulation in planar form


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SPECIFICATION J5.4Correct specification to increase productivity

Reduce time spent on: • misunderstandings• corrections• disputes and • non-compliant works

Fletcher Insulation Specifier Advisory Service T. 1800 000 878E. [email protected]. insulation.com.au


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SPECIFICATION J5.4Avoid risk with fire-resistant insulation

insulation products for bca 2010 vol 1 section j energy

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