structural importance factor residential energy efficiency

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

E | technicalenquiry@buildingcommission.com.au

ANY QUESTIONS