T2 Red products are suitable for use in buildings in internal, above ground, dry structural and non-structural applications in Australia. T2 Red can be used in conjunction with other building materials/systems to resist termite action and meet the performance requirements of the National Construction Code (NCC). Other materials and systems may include termite resistant materials other than T2 Red and/or termite barrier systems.
Building Performance Requirements

When designed, installed, used, and maintained in accordance with the below requirements, T2 Red will provide sufficient termite protection for a building to meet the National Construction Code (NCC) performance requirements relating to termite actions, which may occur north of the Tropic of Capricorn.

Class 2 to Class 9 Buildings (Volume 1) & Class 1 and Class 10 Buildings (Volume 2) BP1.1 & P2.1 Structural stability and resistance to actions:

a) A building or structure, during construction and use, with appropriate degrees of reliability, must:

      i. perform adequately under all reasonably expected design actions; and

      ii. withstand extreme or frequently repeated design actions; and

      iii. be designed to sustain local damage, with the structural system as a whole remaining stable and not being damaged to an extent disproportionate to the original local damage; and

      iv. avoid causing damage to other properties; and

    v. by resisting the actions to which it may reasonably be expected to be subjected.

b) The actions to be considered to satisfy (a) include but are not limited to:

    i. (i), (ii), (iii) ... (xiv), (xv) termite actions.

Building Design Requirements

The structural and durability design of buildings using T2 Red shall comply with the principles and requirements defined in Australian Standards AS1720.1, AS1684 and AS3660. Two options for resisting termite action in a building are:

1. The use of termite resistant materials as primary building elements, and/or
2. The use of termite barrier systems

The NCC defines a primary building element as a member of a building designed specifically to take part of the building loads and includes roof, ceiling, floor, stairway or ramp and wall framing members including bracing members designed for the specific purpose of acting as a brace to those members.

A unique Queensland variation to the NCC, specifically includes the following additional members within the meaning of primary building element, door jambs, window frames and reveals, architraves and skirtings. 

T2 Red is a termite resistant material and may be used solely or in conjunction with other termite resistant materials to resist termite actions and satisfy the NCC performance requirements. Where all primary building elements are not designed, specified and installed as termite resistant; a termite barrier system must be used. Where primary building elements other than T2 Red are also used in a building, then the NCC structural provisions relating to termite action shall be meet (AS3660.1 Termite Management – New Building Work).

Building Installation Requirements

T2 Red is to be installed, used and maintained in accordance with the building practice requirements of AS1684 “Residential timber-framed construction.” T2 Red termite resistance is dependent upon the integrity of the treatment envelope. Research has shown that a trimmed end, abutting a treated surface, does not adversely affect the termite resistance of the timber. Similarly, minor notching, trenching and drilling of holes in T2 Red, in accordance with the requirements of AS1684.2 Clause 6.2.1.4 is considered acceptable by termite experts.

However, a number of practical building situations can arise, during construction, which may either necessitate the removal of the envelope treatment from T2 Red or require the use of termite susceptible timber with no envelope treatment. This may occur in the following situations:

  1. Recessing of metal bracing products
  2. Rebates to accommodate showers or baths
  3. Inclusion of non-termite resistant timber members
  4. Stud straightening by planning of stud mid-sections
  5. Inadvertent damage to members

Where the exposed surface area of termite susceptible timber exceeds the cross-sectional area of the member concerned, then additional termite protection is required to achieve the performance requirements of the NCC relating to termite action. Where replacement of the affected timber member is not practical or possible then the following acceptable methods for protecting termite susceptible timber are required:

1. The installation of a termite barrier system
2. The in-situ preservative treatment of any termite susceptible timber

Suitable brush-on or spray-on preservative treatments for termite susceptible timber are listed below:

  1. Protim® Solignum® XJ Clear
  2. Tanalised® Enseal Clear or Ecoseal

These products contain insecticides, which with the correct application will provide termite protection to any exposed termite susceptible timber.

 

More Information
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