Brisbane 24 th Feb, 2015

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1 Alternative solutions Brisbane 24 th Feb, 2015 Evidence based design and the approach to alternative solutions Ken Thomson, Associate ESD, Erbas & Associates Engineers for Building services 1

2 Agenda Quick overview of the NCC Deemed to Satisfy Alternative solutions Examples 2

3 The National Construction Code now Free The National Construction Code (NCC) is an initiative of the Council of Australian Governments (COAG) developed to incorporate all on-site construction requirements into a single code. The NCC comprises the Building Code of Australia (BCA), Volume One and Two; and the Plumbing Code of Australia (PCA), as Volume Three. From now you can register online at the ABCB website for access to a free electronic copy of the NCC Adopted by State & Territory building legislation: new buildings new building work in existing buildings changes in building classification or use 3

4 The National Construction Code of Australia Each State's and Territory's legislation consists of an Act of Parliament and subordinate legislation which empowers the regulation of certain aspects of building work or plumbing and drainage installations, and contains the administrative provisions necessary to give effect to the legislation. 4

5 The Building Code of Australia Objectives Functional statements Compliance levels Performance requirements Building Solution Building Solution using the DTS Provisions Assessment of Building Solution for compliance with DTS Provisions Building Solution using the Alternative Solution approach Evidence of Suitability &/or Building Solution satisfies DTS Provisions Building Solution does not satisfy DTS Provisions Assessment Methods Verification Method Comparison with the DTS Provisions Expert Judgement &/or &/or Documentation to support decision Documentation to support decision COMPLIANCE WITH BCA ACHIEVED 5

6 The Building Code of Australia Compliance framework a. Prescriptive solution Compliance with the Deemed-to-Satisfy Provisions, or a. Performance Solution alternative solution by appropriate Assessment Method 6

7 Agenda Quick overview of the NCC Deemed to Satisfy Alternative solutions Examples 7

8 Deemed to Satisfy intent The goal of the BCA is to enable the achievement of nationally consistent, minimum necessary standards of relevant safety (including structural safety and safety from fire), health, amenity and sustainability objectives efficiently. This goal is applied so: there is a rigorously tested rationale for the regulation; the regulation generates benefits to society greater than the costs (that is, net benefits); the competitive effects of the regulation have been considered and the regulation is no more restrictive than necessary in the public interest; and there is no regulatory or non-regulatory alternative that would generate higher net benefits. Proposals to change the BCA are subjected, as applicable, to a Regulatory Impact Assessment process. 8

9 Deemed to Satisfy & Performance The DtS provisions within the BCA vol 1 & 2 and PCA vol 3 New perform requirements Extract provides easy reference to provisions for some alternative solutions 9

10 Agenda Quick overview of the NCC Deemed to Satisfy Alternative solutions Examples 10

11 Alternative Solutions assessment methods Evidence A report from a Registered Testing Authority. A current Certificate of Conformity or Certificate of Accreditation. A certificate from a professional engineer. A current certificate issued by a product certification body that has been accredited by the Joint Accreditation System of Australia and New Zealand (JAS-ANZ). Any other form of documentary evidence that adequately demonstrates suitability for use Verification Method Calculations - using analytical methods or mathematical models; and/or Tests - using a technical operation either on-site or in a laboratory to directly measure one or more performance criteria of a given solution. comparison with DtS This method permits a comparison to be made between a Deemed-to-Satisfy Provision and a proposed Building Solution. If it can be demonstrated to the appropriate authority that the Building Solution complies in an equivalent or superior way to a Deemed-to-Satisfy Provision, then it can be deemed to meet the relevant Performance Requirement Expert Judgement Where physical criteria are unable to be tested or modelled by calculation, the opinion of a technical expert may be accepted. This is referred to as the use of Expert Judgement, that is, the judgement of a person who has the qualifications and experience necessary to determine whether a Building Solution complies with the Performance Requirements. 11

12 Alternative Solutions Evidence for products Providing evidence via documentation and certification of the product in accordance with CodeMark The ABCB and New Zealand s Department of Building and Housing (DBH) manage the scheme in their respective countries. The Joint Accreditation System of Australia and New Zealand (JAS-ANZ) accredits certification bodies, who in turn evaluate and certify building products. Relevant legislation requires building control authorities to accept CodeMark certified products 12

13 Alternative Solutions Evidence for products CodeMark process Certification Bodies SAI Global Certification Global-Mark Pty Ltd CertMark Australasia NCS International Pty Limited 13

14 Alternative Solutions Evidence for Design A report from a Registered Testing Authority. A certificate from a professional engineer. Any other form of documentary evidence that adequately demonstrates suitability for use. 14

15 Alternative Solutions Verification Methods Subject to Building Control Authority approval Must be appropriate for use Could be an overseas code or standard Could be an approved modelling software 15

16 Verification Method DTS vs JV3 Deemed-to-Satisfy OBJECTIVE To reduce Green House Gas Emissions EVIDENCE Application of the DtS provisions by checking against BCA clauses and assessing using the provided calculations and Excel calculators Alternative Method JV3 OBJECTIVE To reduce Green House Gas Emissions EVIDENCE 1. Use the entire JV3 protocol as provided in the BCA 2. Compare against the DtS provisions 3. Expert judgement 4. Provide documented evidence of applicable alternative In both cases providing a report or sign-off against the provisions

17 Verification Method DTS vs JV3 Method of Assessment A Architecture B Building Services C Compliance

18 Alternative Solutions Comparison with DtS A direct comparison between BCA clauses and product or design information. This method permits a comparison to be made between a Deemed-to-Satisfy Provision and a proposed Building Solution. If it can be demonstrated to the appropriate authority that the Building Solution complies in an equivalent or superior way to a Deemed-to-Satisfy Provision, then it can be deemed to meet the relevant Performance Requirement 18

19 Alternative Solutions Expert Judgement Where physical criteria are unable to be tested or modelled by calculation, the opinion of a technical expert may be accepted. This is referred to as the use of Expert Judgement, that is, the judgement of a person who has the qualifications and experience necessary to determine whether a Building Solution complies with the Performance Requirements. 19

20 Examples of Alternative solutions Residential Glazing systems DtS compliance Clause (a) Performance Requirements P2.1.1 and P2.2.2 are satisfied for glazing and windows if designed and constructed in accordance with AS 2047 for the following glazed assemblies in an external wall: (b) Performance Requirement P2.1.1 is satisfied for glazing if designed and constructed in accordance with AS 1288 for all glazed assemblies not covered by (a) and the following glazed assemblies:

21 Examples of Alternative solutions Residential Glazing systems Alternative solution Comparison with DtS For compliance with P2.1.1 Structural stability and resistance to actions: The BCA compliance requirements for compliance with the structural provisions for wind loads provide information in Table glass thickness for wind class not exceeding N3: ordinary annealed glass. Clause Human impact safety requirements Additional requirement of impact safety resistance in AS2208 For compliance with P2.2.2 Weatherproofing: The glazing is a fully sealed integrated unit, argon filled. Therefore each window is both air and water sealed glazing unit installed into a timber frame with external grade silicon for weather proofing.

22 Examples of Alternative solutions Conditioned space means a space within a building, including a ceiling or under-floor supply air plenum or return air plenum, where the environment is likely, by the intended use of the space, to have its temperature controlled by air-conditioning, but does not include (a) a non- habitable room of a Class 2 building or Class 4 part of a building in which a heater with a capacity of not more than 1.2 kw or 4.3 MJ/hour provides the air-conditioning; or (b) a space in a Class 6, 7, 8 or 9b building where the input energy to an air-conditioning system is not more than 15 W/m2 or 15 J/s.m2 (54 KJ/hour.m2); or (c) a lift shaft. Conditioned Space Expert Judgement

23 Examples of Alternative solutions Conditioned Space Expert Judgement Definition of Envelope Plant Room Access Stair Private Office = Walls of the building envelope General office: The external walls, roof and floor above a carpark bounding General Office (Conditioned) Public Corridor (Conditioned) General Office (Conditioned) the general office are treated as part of the building envelope under the BCA definition because all rooms are conditioned. Corridor: This area is also inside the envelope because it is conditioned.

24 Examples of Alternative solutions Conditioned Space Expert Judgement A perforated ceiling in this application may not comply with J3, even if there is insulation applied in compliance with J1.

25 Examples of Alternative solutions Conditioned Space Expert Judgement Insulation and building sealing installed in this location what is the conditioned space boundary how do you apply insulation requirements to ductwork in the ceiling void.

26 Examples of Alternative solutions JV3 partial application Using the Baseline building as the DtS model for comparison, energy modelling aspects of a building can be used to determine compliance A Architecture B Building Services C Compliance

27 Summary The NCC a performance based Code Alternative solutions Questions? 27