Lesson Two – Classification of Buildings and Acceptable Construction

Michael Martin - Cert IV - Codes and Standards 2012

CPCCBC4001A Apply building codes and standards to the construction

process for low rise building projects

Lesson Two – Classification of Buildings and Acceptable Construction


Note

• The following slides make use of the ABCB National Construction Code Awareness Resource Kit

• And have been condensed or modified to suit this context.


Todays Lesson

• Handout (next section P 21 to 36)• Classification of Buildings• Performance and Acceptable Construction• Compliance with the BCA• What the BCA applies to

National Construction Code SeriesNational Construction Code Series

Building Code

Volume ThreeGuide toVolume One

Volume OneAppendices Volume TwoVolume One

PlumbingCode



Using the BCA – from P21

• Classifications in whole are in Volume 1, Section A, ‘General Provisions’

• Part A3.2 (BCA 2012 from page 39) • Its important to read the rest of the general

provisions to see what's applicable to the classifications

• BCA Volume 2, section 1.3 (BCA 2012 from page 35)


Using the BCA – from P21

• Once the classification has been established the volume applicable to the “proposed building work can be identified”

• In most cases for us, it will be Volume Two, for we are working within the residential building sector.

• The next step is to work progressively through Section 3 and compare the proposed building work against the Deemed-to-Satisfy Provisions


Classification - from P22

• The Classification of a building or part of a building is determined by the purpose for which it is designed, constructed or adapted to be used (BCA, 2012 A3.1).

• This helps not only in classifying construction requirements, but also governs various other requirements such as: – those for waterproofing, – sanitary facilities, – room sizes, light, – ventilation and noise control

What is a Class of Building?

• Not in your text specifically• The Class – or Classification – of a

building/structure is determined by the purpose for which it is designed, constructed or adapted to be used.

• As the purpose of buildings vary – the BCA has different requirements for different classes of buildings

Operation of the BCAMichael Martin - Cert IV - Codes and Standards 2012

Classes of Buildings

• Part A3 of the BCA provides detailed descriptions of various classes of buildings.

• The classifications and typical examples include:– Class 1a single dwellings / houses– Class 1b small guest / boarding houses– Class 2 dwellings / apartments (above others)– Class 3 hotels / motels (unrelated persons)– Class 4 a single dwelling in a Class 5 to 9



– Class 5 offices – not Class 6 to 9– Class 6 retail shops– Class 7a carparks – Class 7b storage / display warehouses– Class 8 a laboratory or factory– Class 9a health-care building– Class 9b assembly building

Operation of the BCAMichael Martin - Cert IV - Codes and Standards 2012


– Class 9c aged care building– Class 10a non-habitable building (e.g. a carport/ garage)– Class 10b structure – swimming pool – fence– Class 10c a private bushfire shelter

• Buildings can have multiple classifications • Each part of a building must be classified separately, except that if

not more than 10% of floor area of the part in which it is located, the major classification may apply (exclusions apply – See A3.3).

• Look in your text notes to further explain & view example P24 to 25



Exercise - from P24 • Building Classification ?

• 1. abattoirs 8• 2. hospital 9a

• 3. government offices 5

• 4. football ground stadium 9b

• 5. two storey house 1a

• 6. block of flats 2

• 7. hotel 3

• 8. butter factory. 8


Performance & Acceptable Construction - from P27

• Performance based regulations differ in that they set levels of performance that must be achieved.

• also referred to as objective based • set mandatory levels of performance required • do not dictate how to achieve required results• must ultimately be ‘accepted’ by a Certifying

Authority


Volume Two

Section 1

Section 2

Section 3

Contains information on the operation and application of the BCA

Contains all Performance Requirements for volume Two

Contains Acceptable Construction or the Deemed-to-Satisfy Provisions


Acceptable Construction

• Acceptable Construction Manuals can include Australian Standards

• Acceptable Construction Practice will generally reflect traditional construction techniques

ACCEPTABLECONSTRUCTION


MANUALS


PRACTICE

OR


BCA Structure & Example - from P28

• Performance Requirements – state mandatory levels of performance for Building Solutions

• Building Solutions – are solutions that comply with Performance Requirements and may be: – a Deemed-to-Satisfy solution – or an Alternative Solution – or a combination of both


BCA Structure & Example -

• BCA, Part 3, section 3 – Parts 3.1 to 3.12 (BCA 2012 from page 101)

• These are “ deemed-to-satisfy provisions that are considered to be acceptable forms of construction that meet the legislative requirements for complying with the housing provisions” (BCA, 2012 p. 101)


Scenario One


Scenario One

• What's the problem ?• Site drainage problem– Causing water ponding in sub floor– Decay of stumps– Decay of timber joists and bearers

• What class of building ?• Class 1a, residential house


BCA Specific

• BCA 3.1.2.3 Surface water must be diverted away from class 1 buildings as follows:– (c) The ground beneath suspended floors must be

graded so that the area beneath the building is above the adjacent external finished ground level and surface water is prevented from ponding under the building (see figure 3.1.2.3)

– Continues next slide


BCA Specific (2012 page 118)


BCA Specific (BCA 2012, page 118)

• Also consider• 3.1.2.4 Subsoil drainage• Where a subsoil drainage system is installed to

divert subsurface water away from the area beneath a building, the subsoil drain must……

• Anything else ??

Lesson Two – Classification of Buildings and Acceptable Construction

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