STRUCTURAL IMPORTANCE FACTOR RESIDENTIAL ENERGY EFFICIENCY SEMINAR ENGINEERS AUSTRALIA 22 FEBRUARY 2013 Marcus Collard Senior Technical Advisor Technical and Research Services
STRUCTURAL IMPORTANCE FACTORRESIDENTIAL ENERGY EFFICIENCY SEMINAR
ENGINEERS AUSTRALIA
22 FEBRUARY 2013
Marcus CollardSenior Technical AdvisorTechnical and Research Services
ProgramImportance Factor
� BCA / AS1170.0
� Examples
Energy Efficiency
� Practice Note 2011-55
� Verification Method
� Computer Software Ratings
� DtS Elemental Provisions New Dwellings
� ABCB Reference Documents
IMPORTANCE FACTOR
Building Legislation in Victoria
ADMINISTRATIVE MATTERS
• Administration• Appeals• Registrations• Refurbishments• Building standard
TECHNICAL STANDARDS
STATE & TERRITORY BUILDING ACTS
STATE & TERRITORY BUILDING REGULATIONS
NATIONAL CONSTRUCTION CODE SERIES
Volume 1 BCA 2011 – Class 2-9 buildings – Blue
Volume 1 BCA Appendices - White
Volume 1 BCA Guide – Yellow
Volume 2 BCA 2011 – Class 1 & 10 buildings – Red
Volume 3 PCA - Green
Importance Factor
� BCA Volume 1 Class 2 to 9 buildings
– Part B Structure
� BCA Volume 2 Class 1 and 10 buildings
– Part 3.11 Structural design manuals
� AS/NZS 1170 Part 0 2002
BCA Importance Factor
Part B (Class 2 to 9)
Table B 1.2a, B1.2b
and
Part 3.11 (Class 1 and 10)
Table 3.11.3a, 3.11.3b
AS/NZS 1170.0 2002
AS/NZS 1170.0 2002
Guide to the BCAExamplesImportance Level
Low rise residential constructionBuildings and facilities below the limits set for
importance level 3.
2
Farm buildings, Isolated minor storage facilities, Minor temporary facilities
1
Importance Level 3 Examples
Buildings and facilities where more than 300 people can congregate in one area.
Buildings and facilities with a primary school, a secondary school or day care facilities with a capacity greater than 250.
Buildings and facilities with a capacity greater than 500 for colleges or adult educational facilities
Health care facilities with a capacity of 50 or more residents but not having surgery or emergency treatment facilities
Jails and detention facilitiesAny occupancy with an occupant load greater than 5000Power generating facilities, water treatment and waste water treatment
facilities, any other public utilities not included in Importance Level 4Buildings and facilities not included in Importance Level 4 containing
hazardous materials capable of causing hazardous conditions that do not extend beyond property boundaries.
Importance Level 4 Examples
Buildings and facilities designated as essential facilitiesBuildings and facilities with special post disaster functionsMedical emergency or surgery facilitiesEmergency service facilities: fire, rescue, police station and emergency
vehicle garagesUtilities required as backup for buildings and facilities of Importance Level 4Designated emergency sheltersDesignated emergency centres and ancillary facilitiesBuildings and facilities containing hazardous materials capable of causing
hazardous conditions that extend beyond property boundaries.
ExampleA hospital may be of Importance Level 4 if it is the only hospital in an area. The same hospital may be of Importance Level 3 if it is one of many in an area.
Guide to the BCA
Level 1
Level 2
Level 3
Level 4
Level 5
� Not referenced in the BCA
Level ?
Level ?
Level ?
Level ?
Level ?
Level ?
Level ?
Fire at Warrnambool telephone exchange leaves 60,000 without mobile, internet or landline services
November 2012
YOU ARE AN INDUSTRY PROFESSIONAL
ENERGY EFFICIENCY
PRACTICE NOTE 2011-55
PN 2011-55
USE OF BCA 2012
Use of BCA 2012
� Volume One – Section J Energy EfficiencyClass 2 to 9 buildings
� Volume Two – Part 3.12 Energy EfficiencyClass 1 and 10 buildings
Use of BCA 2012
� Performance Requirements:
JP1, JP2 and JP3 or P2.6.1 and P2.6.2
� Verification Methods:
JV3 or V2.6.2.2
(both using a reference building)
� Deemed to Satisfy
� Victoria additional water saving measures for new class 1
Use of BCA 2012
� Class 2 to 9 Buildings
� Class 2 and 4 – 6 star average,
5 star minimum,
plus specific DtS requirements,
� Remainder of building and other classes,
comply with all Parts of Section J,
� PN 2011-55 Appendix 3
Use of BCA 2012
� Class 1 and 10 Buildings
� 6 star minimum,
plus specific DtS requirements,
OR
� DtS elemental provisions of 3.12.1 to 3.12.5
� PN 2011-55 Appendix 2
Use of BCA 2011
6 Star plus specific DtS requirements:
� Testing and installation of insulation,
� Thermal breaks for steel roof and wall framing,
� Compensating for ceiling insulation loss,
� Floor edge insulation,
� Building sealing,
� Services.
VERIFICATION METHOD
Verification Methods
� JV3 and V2.6.2.2
� Verification using a reference DtS building,
� Zone 7 & 8 heating load ≤ DtS building
� Zone 4 & 6 heating & cooling load ≤ DtS building
energy loads ≤
DtS reference buildingProposed design
COMPUTER SOFTWARE RATINGS
Computer Software Ratings
� Software must comply with:
ABCB Protocol for Building Energy Analysis Software Version 2006.1 (Class 3, 5 to 9)
ABCB Protocol for House Energy Rating Software Version 2006.1 (Class 1, 2 and 4)
AccuRate, BERS Pro, FirstRate 5
Computer Software Ratings
� Ensure the assessor is accredited:
– ABSA (Association of Building Sustainability Assessors)
– BDAV (Building Designers Association of Australia)
� Accredited for the software and version,
� Provide a report,
� Provide stamped plans.
Computer Software Ratings
Items to check:
� Location and climate zone,
� Orientation, site plan, floor plan,
� Construction,
� Additional insulation,
� Special windows or glazing,
� Any conditions or construction requirements.
Computer Software Ratings
Plus specific DtS requirements:
� Testing and installation of insulation,
� Thermal breaks for steel roof and wall framing,
� Compensating for ceiling insulation loss,
� Floor edge insulation,
� Building sealing,
� Services.
DtS ELEMENTAL PROVISIONS
DtS Elemental Provisions
New Building or Additions to an Existing Building:
� Building Fabric,
� External Glazing,
� Building Sealing,
� Air Movement and
� Services.
DtS Elemental Provisions
Building Fabric
� Roof,
� Walls,
� Floors,
� Applies to a Class 1 building and
� Class 10a with a conditioned space:
1.2kW or 4.5 MJ/hr
DtS Elemental Provisions
Roof:
� Solar Absorptance Values:
0.30Light cream0.35Off white0.45Light grey0.55Galvanised steel — dull0.55Zinc aluminium — dull0.60Yellow, buff0.75Red, green0.90Slate (dark grey)
ValueColour
DtS Elemental ProvisionsRoof:
� Table 3.12.1.1a ROOF AND CEILING—
MINIMUM TOTAL R-VALUE
6.35.1Minimum Total R-Value for a roof or ceiling with a roof upper surface solar absorptance value of more than 0.6
6.34.6Minimum Total R-Value for a roof with an upper surface solar absorptance value of more than 0.4 but not more than 0.6
6.34.1Minimum Total R-Value for a roof with an upper surface solar absorptance value of not more than 0.4
UpwardsDirection of heat flow
84, 5, 6 & 7Climate Zone
Roof:
� Construction type Total R-Value:
Therefore 5.1-0.23 = R 4.87 additional insulation required
DtS Elemental Provisions
DtS Elemental Provisions
Roof:Adjustment for the loss of ceiling insulation
DtS Elemental Provisions
Roof Lights:
� Are they required for minimum light or ventilation requirements?
� Yes: 150% area ventilation,
SHGC < 0.29, Total U-Value < 2.9
� No: Comply with table 3.12.1.2,
Maximum 5% of room floor area
DtS Elemental Provisions
Walls:
� Allowances for Heavy Weight walls ≥ 220kg/m2
Table 3.12.1.3a — OPTIONS FOR EACH PART OF AN EXTERNAL WALL
Achieve a minimum Total R-Value of 3.8.8
Achieve a minimum Total R-Value of 2.8.6 and 7
shade the external wall of the storey with a verandah, balcony, eaves, carport or the like, which projects at a minimum angle of 15 degrees in accordance with Figure 3.12.1.2.
(ii)
Achieve a minimum Total R-Value of 2.4; and(i)(b)
Achieve a minimum Total R-Value of 2.8.(a)
1, 2, 3, 4 and 5
OptionsClimate Zone
DtS Elemental Provisions
Walls:
� Clay masonry veneer; Total R-Value 0.56
Therefore 2.8-0.56 = R 2.24 additional insulation required
DtS Elemental Provisions
Floors:
Suspended floors:
Table 3.12.1.4 SUSPENDED FLOOR – MINIMUM TOTAL R-VALUE
Note:For an enclosed perimeter treatment, the underfloor airspace and its enclosure may be included in the Total R-Value calculation.
3.252.752.251.02.251.51.01.5Minimum Total R-Value
Downwards Upwards Direction of heat flow
87654321Climate Zone
DtS Elemental Provisions
Concrete Slab insulation:
Suspended slab:
R 1.0 insulation perimeter, R2.0 insulation under entire slab where in slab heating or cooling,
Slab on ground:
R 1.0 insulation perimeter, where in slab heating or cooling,
R2.0 insulation under slab climate zone 8.
Note: The height of the floor is measured from ground surface to the underside of the floor or the insulation.
0.46Downwards0.34UpwardsUnenclosed
0.640.790.84Downwards0.520.670.71UpwardsEnclosed - more than 1.2 m
to not more than 2.4 m high
0.720.890.94Downwards0.600.760.81UpwardsEnclosed - more than 0.6 m
but to not more than 1.2 m high
0.851.011.06Downwards0.720.880.93UpwardsEnclosed - not more than 0.6
m high
(b) Suspended concrete floor0.51Downwards0.39UpwardsUnenclosed
0.690.840.89Downwards0.570.720.76UpwardsEnclosed - more than 1.2 m
to not more than 2.4 m high
0.770.941.00Downwards0.650.810.86UpwardsEnclosed - more than 0.6 m
but to not more than 1.2 m high
0.901.061.11Downwards0.770.931.00UpwardsEnclosed - not more than 0.6
m high
(a) Suspended timber floor
9 mm fibre-cement sheet
190 mm concrete masonry
Cavity masonry
Total R-ValueEnclosure and height of floor
Table 3.12.1.5 TOTAL R-VALUE FOR TYPICAL SUSPENDED FLOOR CONSTRUCTION (for a floor without a floor heating system)
Cavity Barrier
DtS Elemental Provisions
Attached Class 10a buildings:
� Comply with external fabric requirements,
� Be separated from Class 1.
DtS Elemental Provisions
External Glazing
[(A1 x U1) + (A1 x U1) + .......] / [(A1 x SHGC1 x EW1) + (A2 x SHGC2 x EW2) + ........ ]
where—
A1, 2, etc = the area of each glazing element;
U1, 2, etc = the Total U-value of each glazing element;
SHGC1, 2, etc = the SHGC for each glazing element;
EW1, W2 etc = the winter exposure factor for each glazing element obtained from Table 3.12.2.2a.
DtS Elemental Provisions
External Glazing
(A1 x SHGC1 x ES1) + (A2 x SHGC2 + ES2) + .........
where—
A1, 2, etc = the area of each glazing element;
SHGC1, 2, etc = the SHGC for each glazing element;
ES1, S2, etc = the summer exposure factor for each glazing element obtained from Table 3.12.2.2b;
Improved window frames
See Thru Windows
DtS Elemental Provisions
Building Sealing
� Chimneys and Flues,
� Roof Lights,
� External Windows and Doors,
� Exhaust Fans,
� Construction and
� Evaporative Coolers.
DtS Elemental Provisions
Air Movement
� Climate zone 4 additional ventilation above 3.8.5 requirements for habitable rooms,
� 10% floor area, or
� Ceiling fans, or
� Evaporative cooler.
DtS Elemental Provisions
Services
� Insulation of services,
� Central heating water piping insulation,
� Heating and Cooling ductwork insulation,
� Electric Resistance space heating (more than 1 room):
– Room isolation switches,
– Temperature controller and time switch,
– 110W/m2 living rooms, 150W/m2 bathrooms
DtS Elemental Provisions
ARTIFICIAL LIGHTING
� Lamp power density,
� Illumination power density,
– Class 1 5W/m2,
– Verandah or balcony 4W/m2,
– Class 10 3W/m2,
– External lighting 40 Lumens/W
DtS Elemental Provisions
ARTIFICIAL LIGHTING
� Control devices includes:
– Lighting timer,
– Motion detector,
– Dimmers, manual and programmable,
– Daylight sensors.
� Allow additional W/m2 within a building
DtS Elemental Provisions
Heating and pumping of swimming pools and spas
� ABCB Corrigendum
ABCB REFERENCE DOCUMENTS
USEFULL LINKS
� ABCB www.abcb.gov.au
� ABSA www.absa.net.au
� BDAV www.bdav.org.au
� Building Commission www.buildingcommission.com.au
� Sustainability Victoria www.sustainability.vic.gov.au
� WERS www.wers.net
Contact Us
Building CommissionGoods Shed North733 Bourke StDocklands VIC 3008
P.O Box 536Melbourne VIC 3001
T | 1300 815 127
ANY QUESTIONS