ANTI TERMITE TREATMENT:
Before any type of construction anti-termite treatment is a process in which soil or sub soil treatment is applied to a building in preliminary stages of its construction. The requirement of anti-termite treatment is to provide the buildings or any type of structures with a chemical protector against the sub-terrain termites.Anti-termite treatment is a sophisticated task, required effective knowledge of the chemical composition , soils characteristics, various termite to be dealt with and the suitable and non suitable environmental conditions, in order to provide
effective treatment and long lasting protection to the property undergoing anti termite treatment.
- Now it can be explained that the works of anti-termite treatment need to be got executed through specialized agencies only. The pre constructional soil anti termite treatment is required to be applied during the construction stages of the sub-structure up to plinth level. The authorized vendor has to be watchful of the various phase of sub-structure works and arrange to carry out the soil treatment in time after proper coordination with the respective department and other authorized at site.
Scope of the work:
The physical scope of anti-termite treatment covers the soil treatment with approved chemicals in water emulsion in foundation trenches for columns, plinth beams, plinth filling, at junction of walls and floor, in expansion joints etc. in stages as detailed in this specifications and drawings.
In order to confirm uniform distribution of the chemical emulsion and to assist penetration, the following site preparation shall be carried out:
a) Remove all trees, stumps, logs or roots from the building site.
b) Remove all concrete form work if left any where, leveling pegs, timber off-cuts and other building debris from the area to be treated.
c) If the soil to be treated is sandy or porous, preliminary moistening will be required to fill capillary spaces in soil in order to prevent the loss of emulsion through piping or excessive percolation.
d) In the event of water logging of foundation, the water shall be pumped out before application of chemical emulsion and it should be applied only when the soil is absorbent.
e) On clays 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 75mm at least.
f) All sub-floor leveling and grading should be completed. All cutting trenches and excavations should be completed with back filling in place, borrowed fill must be free from organic debris and shall be well compacted. If this is not done supplementary
treatments should be made to complete the barrier.
Chemical to be used:
The effectiveness of chemical depends upon the choice of the chemical, the dosage adopted and the thoroughness of application. The chemical solutions or emulsions are required to be dispersed uniformly in the soil and to the required strength so as to form an effective chemical barrier which is lethal and repellent to termites.
Soil treatment with chemicals:
One of the following chemicals in water emulsion shall be used uniformly over the area to be treated.Chemical % of concentration of Chemical by weight in the Kerosene emulsion
I. Heptachlor 20 EC emulsifable concentrates
II. Chlordance 20 EC emulsifable concentrates
III. THIODAN 35 EC emulsifable concentrates
IV. Chlorpyriphos 20 EC emulsifiable concentrates
Mode and Rate of Application:
The chemical emulsion as stated above will be applied uniformly by sprayers at the prescribed rates as detailed below in all the sages of the treatment.
Treatment in Foundation Trenches:
In case of normal wall load bearing structures, columns pits, wall trenches and basement, the treatment shall be at 5 litres/sqm. or surface area of the bottom and sides to a height of at least 300mm. After the foundation work, the sides shall be treated at 7.5 litres/sqm.of vertical surface of substructure on each side. After the earth filling is done, treatment shall be done by rodding the earth at 150mm centers close to wall surface and spraying the chemical with the above dose i.e. 7.5 litres/sqm. In case of framed structure, the treatment shall start at adepth of 500mm below ground level. From this depth the backfill around the columns, beams and R.C.C. basement walls shall be treated at 7.5 litres / sqm. of the vertical and at 5 litres /sqm. for the horizontal surface at the bottom in the trenches / pits.
Treatment on Top Surfaces on Plinth Filling:
The top surface of the filled earth within plinth walls shall be treated with chemical emulsion at the rate of 5 litres/sqm. of the surface area before sub-base to floor is laid. If filled earth has been well rammed and the surface does not allow the emulsion to seep through, holes up to 50 to 75mm deep at 150 mm centers both ways shall be made with crow bars on the surface to facilitate saturation of the soil with the emulsion.
Treatment at Junction of Walls and floors:
Special care shall be taken to establish continuity of the vertical chemical barrier on the inner wall surfaces from the finished ground level (or from level where the treatment had stopped) up to the level of the filled earth surface. To achieve this a small channel 30 X 30 mm. shall be made at all the junctions of wall / column with floor (before laying sub-grade) and rod holes made in the channel up to the finished ground level at 150mm apart and the iron rod moved backward and forward to break the earth and chemical emulsion poured along the channel at 7.5 litres (or at recommended quantity per sqm. of the vertical wall / column surfaces so as to soak the soil right up to the bottom. The soil shall be tamped back into place after this operation.
Treatment for Expansion Joints:
The soil beneath the expansion joins shall receive special attention when the treatment under 2.5.1 above is in progress. This treatment shall be supplemented by treating through the expansion joint after sub-grade has been laid at the rate of 2 litres per metre length of expansion joint.
Precautions during Treatment:
1. Utmost care shall be taken to see that the chemical barrier is complete and continuous. Each part of the area shall receive the prescribed dosage of chemical emulsion.
2. The treatment should not be carried out when it is raining or when the soil is wet with rain or sub-soil water.
3. Once formed, the treated soil barrier shall not be disturbed. If by chance,treated soil barriers are disturbed, immediate steps shall be taken to restore the continuity and completeness of the barrier system.
Precautions for Chemical Health Hazards and Safety Measures:
All the chemicals mentioned here are extremely poisonous and hazardous to animal and human health. These chemical components can have an opposite and bad effect upon human health when absorbed through the outer portion of skin, inhaled as vapors or spray mist or swallowed etc. During handling or using these hazardous chemicals should be warned of these dangers and advised that absorption through the skin is the most likely source
of accidental poisoning. They should be cautioned to observe carefully all the safety precautions particularly when handling these chemicals in the from of concentrates. Particular care should be taken to prevent skin contact with this raw concentrates.Workers should wear clean clothing and should wash thoroughly with soap and water especially before eating. In the event of severe contamination, clothing should be removed at once and the skin washed with soap and water. If these hazardous chemicals splash into the naked eyes they shall be flushed with plenty of water and immediate medical attention should be sought.The hazardous concentrates are oil solutions and present a fire hazard owing to the use of petroleum solvents. Flames should not be allowed during mixing of following chemicals.Sufficient care should be taken in the application of chemicals / soil toxic-ants to see that they are not allowed to contaminate wells or springs and other sources of drinking water.
Method of measurement:
The bill payment will be made on the basis of plinth area of the building measurements at ground floor area only. For all the steps of treatment in sqm. correct to two places of decimals. Various rates are includes the cost of materials, labour and all tools, plants, sprayers , transportation , marketing required for complete operation.