lesson three – scenario exercises, and understanding p erformance r equirements

Michael Martin - Cert IV - Codes and Standards 2012

CPCCBC4001A Apply building codes and standards to the construction

process for low rise building projects

Lesson Three – Scenario Exercises, and Understanding Performance Requirements


Todays Lesson

• Handout (next section P36 to n44 )• Review Scenario 1• Understanding Performance (begin)• Scenario 2 in groups


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 ??


Review What BCA Applies to

• The application of the BCA is determined by each State or Territory• Generally – the BCA applies to the

construction of all new buildings • The BCA can also apply to additions and

alterations to existing buildings• The BCA, or parts of it, can also apply to

proposals to change the use of a building


Understanding Performance Requirements

from P 36 text


Understanding Performance Requirements – from P 36 text

• Requirements are mandatory and Deemed-to-Satisfy Provisions are optional

• However complying with the BCA without using Deemed-to-Satisfy Provisions – Means: developing Alternative Solutions

• We’ve broken this into three sections– Prescription ‘v’ performance– Developing Alternate Solutions– Assessment of Alternate Solutions


Prescription ‘v’ Performance

• The old system (Prescription)– When something must be done– What must be done– How it must be done

• A minimum necessary standard P 37• In this system, alternative methods were sought

through the courts• Example of prescriptive clause on P 38• Now look at the alternate clause P 38 written as a

performance requirement (the current BCA)


Performance & Alternate Solutions

• No longer need to apply to Tribunals or Courts• Most Certifying Authorities can now approve

Alternative Solutions • Performance regulations reduce the need to;– lodge objections to regulations– apply for a modification or variation of a code– appeal decisions of Certifying Authorities

• What do you see as the benefit of doing things the way you like ? P 39


BCA language & Performance

• we need to understand what’s actually required in order to comply P 39

• must understand the wording and the language used to express Performance Requirement.

• There are two ways– QUALITATIVE terms or – QUANTITATIVE terms


Qualitative

• This means that requirements are described using words

• The wording does not propose any particular means of compliance

• The designer has flexibility to use any acceptable means


Quantitative

• This means that requirements are described using numbers

• That provide an absolute measure of performance

• This Performance Requirement specifies the intensity of rainfall that must be accommodated in the design of a surface water system


Two key phrases

• To the degree necessary……• Appropriate to …….

• Look over page 40 to 42


Developing Alternatives

• It’s often preferable to design something different to DTS • to develop an Alternative Solution. P 42• Full compliance with the DTS is usually the simplest way

to design a building• following the DTS pathway may not be the most cost-

efficient or practical• It may also not be possible to do so if a client wants

something out of the ordinary. • Part A0.5 provides two pathways to demonstrate

compliance of Alternative Solutions


Part A0.5 (BCA 2012, Vol 1, P 19)

1. Developing an Alternative Solution to meet the Performance Requirements2. Developing an Alternative Solution to at least equate to DTS Provisions

We’ll carry on with this next week P 43


Scenario Two


BCA Standard Specific

• 3.1.3 (BCA 2012, from P 123)


Other AS Standards

• AS3660.1 – 2000 Termite Management – New Building Work

• AS3660.2 – 2000 Termite Management – In and around existing buildings and structures – Guidelines

• AS3660.3 – 2000 Termite Management – Assessment criteria for termite management systems

• AS 4349.3 – 1998 Inspections of Buildings – Timber pest inspections


http://www.timber.net.au/index.php/termite-management-for-builders.html


Reference list

• ABCB National Construction Code Awareness Resource Kit

• http://www.timber.net.au/index.php/termite-management-for-builders.html

• http: www.google.com.au (for some images)

http://www.google.com.au/

lesson three – scenario exercises, and understanding p erformance r equirements

Documents

building codes

bca specific bca

bca specificbca

bearerswhat class of

existing buildingsthe

alternate clause p

subsoil drainage system

scenario exercises