Part JSection J (Part J) report – DTS and JV3 Performance based solutions

At Low Impact Development Consulting we will provide you with a timely building energy efficiency Building Code of Australia Section J (Part J) report.

We undertake thorough Deemed to Satisfy (DTS) assessments including liaising with the building surveyor for more complex buildings that do not pass the simpler DTS assessment we can undertake energy modelling of the proposed building. This computer modelling JV3 performancealternative solution generally provides more opportunities for solutions and meeting compliance than does the simpler DTS assessments.

We will confirm a DTS or computer modelling alternative solution quote within two days, and request copies of pdf plans for quoting.

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JV3 Alternative Solution report snapshot

We undertake JV3 Alternative Solution energy simulations on more complex buildings or where your building struggles to pass the deemed to satisfy Section J assessment process. An Alternative Solution computer simulation is a more holistic and detailed assessment than the deemed to satisfy (DTS) approach. Where a standard DTS Section J assessment will fail the glazing component if one elevation fails, an Alternative Solution undertaken to JV3 requirements will allow for the net energy losses/gains of all the elevations combined. A fail in the glazing performance on one elevation can be offset by a greater pass on another elevation. Alternatively the energy loss/gains of the glazing can be offset by improved insulation in other aspects of the building fabric. This more detailed modeling allows greater flexibility and chance of energy efficiency compliance for your building, than a Section J deemed to satisfy assessment might. It will often allow a lower specification glass tint to comply.

Section J Alternative Solution modeling is the non-residential modeling equivalent of the residential modeling NatHERS (FirstRate, Accurate, BERS) process, except that it generally involves a higher level of complexity than most residential modeling.

Part J Background

Section J of the Building Code of Australia (BCA) requires minimum levels of energy efficiency to be achieved for non-residential buildings (generally building classes 3-10). Compliance applies to all new buildings within these classes, and to all new extensions or refurbishments of existing buildings in these classes, although there is some latitude as to how far compliance with Section J must go in some extension or refurbishment projects.

Section J addresses the operational building energy efficiency, but takes no account for water sensitive design aspects, material selection, waste, recycling, indoor environment quality or the impact of the building project on the natural environment. It addresses specific standards to be achieved for:

  • Insulation
  • Glazing performance
  • Building Sealing
  • Air-conditioning and ventilation performance
  • Artificial lighting and power performance
  • Access to plant for maintenance

It is beneficial for BCA Section J compliance to be considered early in the design development stage of a project, ideally window schedules and walls types have been nominated, as it is then that the relevant elements: window locations, size and orientations, building fabric systems, lighting and mechanical heating, cooling and ventilation elements are being considered and can be altered if necessary. If obtaining Section J compliance is left until the end of the design process, un-welcome costs may need to be incurred to modify the design, or upgrade the spec of any of the above mentioned elements to compensate for weaknesses in the building fabric’s passive design characteristics. Alternatively a more expensive energy modelling JV3 alternative solution approach may be required to show the building still meets the required BCA building energy efficiency performance standards.