How to achieve DIY BASIX energy requirements with Bradford

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Bradford Insulation Selector

Recent Changes to BASIX DIY

On July 1st 2017, the New South Wales Government increased the energy targets and insulation requirements under the BASIX DIY method. This means higher insulation values are required due to increases in the heating and cooling caps. Builders need to ensure that they meet the new minimum R-Value requirements.

How To Achieve BASIX DIY

A number of solutions are now available to help builders achieve the BASIX DIY energy requirements. All available solutions for residential Brick Veneer and Lightweight Clad construction have been provided below. Key considerations when attempting to achieve the NSW BASIX DIY energy targets are:

  • Climate Zone/Region
  • Wall Type/Roof Type
  • Stud Spans
  • Wall Wrap options
  • Slab On Ground or Suspended Floor

When To Use BASIX DIY

The use of the BASIX DIY method is required if your building meets any of the following criteria.

  1. The conditioned floor area is 300m2 or less
  2. The building is no more than double storey
  3. The dwelling contains no open mezzanine area greater than 25m2
  4. The dwelling does not contain a third level habitable attic room
  5. The glazing area must be within 10% to 40% of the conditioned floor area
  6. Total number of glazing units in the building must be less than 40
  7. The total area of skylights and sky windows must be 3m2 or less

If your building does not meet these minimum requirements, you will need to use the Simulation Method under BASIX to obtain a certificate.

Please note: using these insulation values does not guarantee that the requirements of the BASIX DIY assessment will be met. A full BASIX DIY assessment must be completed to ensure that glazing, water and energy consumption requirements for the building are met.

Brick Veneer Insulation Selector

To find the required wall or ceiling insulation:

  1. Identify your ‘Region’ or ‘Climate Zone’
  2. Pick your ‘Wall Wrap’ or floor type
  3. Choose your ‘Stud Thickness’ or roof type
  4. Find the required insulation

The table below shows the minimum insulation values needed to meet the BASIX DIY requirements for Brick Veneer walls and a variety of roof options.

(click image to enlarge)

In certain regions, it is now possible for builders to use a combination of Bradford R1.5 insulation batts and Thermoseal Wall Wrap XP to achieve the thermal comfort assessment Brick Veener walls. Thermoseal Wall Wrap XP is able to provide a reflective air-gap R-Value of 0.5 when the semi-reflective antiglare surface faces a 40mm brick veneer wall cavity. However, in colder more temperate regions, where condensation control is required, the use of Enviroseal RW is recommended.

Lightweight Clad Insulation Selector

To find the required wall or ceiling insulation:

  1. Identify your ‘Region’ or ‘Climate Zone’
  2. Choose ‘Direct Fix’ or ‘Battened’ or your floor type
  3. Choose your ‘Stud Thickness’ or your roof type
  4. Find the required insulation

The table below shows the minimum insulation values needed to meet the BASIX DIY requirements for Lightweight Clad walls and a variety of roof options.

(click image to enlarge)

Wall Wrap XP is not suitable behind Lightweight Clad wall construction and the use of Enviroseal RW is recommended for increased condensation control.

To determine the new minimum R-Values needed to meet insulation requirements under the BASIX DIY method, please refer to the BASIX Technical Bulletin leaflet by Bradford.

 

Source: Bradford Technical Bulletin – Revision Level A May 2018