1. SCOPE
This standard (Part 2) gives recommendations for the
chemical treatment of soils for the protection of
buildings from attack by subterranean termites. It
includes reference to the chemicals to be used, lays
down minimum rates of application for usage, and
outlines procedures to be followed while the building
is under construction.
2. REFERENCES
The Indian Standards given in Annex B contain
provisions, which through reference in this text,
constitute provision of this standard. At the time of
publication, the editions indicated were valid. All
standards are subject to revision, and parties to
agreements based on this standard are encouraged to
investigate the possibility of applying the most recent
editions of@e s@dm,ds indicated.
3. TERMINOLOGY
For the purpose of this standard, the following
definitions shall apply.
3.1 Chemical Barrier
The layer of chemically treated soil in immediate
contact with the foundation and floor structure of a
building which kills or repels termites thus forming a
barrier which is impervious to termite entry.
3.2 Soil Treatment
The application of chemicals (toxicants) to the soil
adjacent to and under a building to form a chemical
barrier which is lethal or repellent to termites.
3.3 Pre-Construction Soil Treatment
This is a process in which soil treatment is applied to
a buildlng during the early stages of its construction.
4. SITE PREPARATION
4.1 The removal of trees, stumps, logs or roots from
a building site reduces the hazards from subterranean
termites. Similarly, the sub floor area should be kept
free from all debris in which new colonies of termites
might be established. In order to ensure uniform
distribution of the treating solution and to assist
penetration, some site preparation, may be necessary.
The information given in
4.1.1 to 4.1.4 is for guidance
in preparing a building site for chemical treatment.
4.LI Heavy Soils and Sloping Sites
On clay and other heavy soils where penetration is
likely to be slow and on sloping sites where run off of
the treating solution is likely to occur, the surface of
the soil should be scarified to a depth of at least 75 mm.
4.1.2 Sandy or Porous Soils
On loose, sandy or porous soils where loss of treating
solution through piping or excessive percolation is
likely to occur, preliminary moistening to fill the
capillary spaces in the soil is recommended.
4.1.3 Levelling, Excavations and Filling
All sub floor levelling and grading should be
completed; all cuttings, trenches and excavations
should be completed with backfilling in place,
borrowed fill must be free from organic debris and
should be well compacted. If this is not done
supplementary treatments should be made to complete
the barrier.
4.L4 Concrete Formwork
All concrete formwork, Ievelling pegs, timber off-cuts
and other builder’s debris should be removed from the
area to be treated.
5. CHEMICALS AND RATE OF APPLICATION
5.1 Basic Principle
Chemical toxic to subterranean termites maybe used
effectively to check termite infestation in the soil.
These are useful in the treatment of new building sites
and may also be used to eradicate existing infestation
in buildings and to prevent reinfestation. The
effectiveness and/or residual activity depend upon the
choice of the chemicals, the dosages adopted and the
thoroughness of application. The chemical solutions
or emulsions are required to be dispersed uniformly in
the soil and of the required strength so as to form an
effective chemical barrier which is lethal and
repellent to termites.