ANTITERMITE TREATMENT:

GENERAL :

Preconstructional anti-termite treatment is a process in which soil treatment is applied to a building in early

stages of its construction. The purpose of antitermite treatment is to provide the building with a chemical barrier

against the sub-terranean termites.

Antitermite treatment being a specialized job, calls for thorough knowledge of the chemicals, soils, termite to

be dealt with and the environmental conditions, in order to give effective treatment and lasting protection to the

property undergoing treatment. It is, therefore, imperative that the works of antitermite treatment should be got

executed through specialized agencies only. The specialized agency should be preferably a member of the

Indian Pest Control Association and shall have sufficient experience of carrying out similar works of magnitude

envisaged in this tender.

The preconstructional soil treatment is required to be applied during the construction stages of the sub-structure

upto plinth level. The contractor has to be watchful of the various stages of sub-structure works and arrange to carry

out the soil treatment in time after proper co-ordination with Department and other contractors if any, working at site.

SCOPE :

The scope of preconstructional antitermite treatment covers the soil treatment with approved chemicals in water

emulsion in foundation trenches for columns, plinth beams, pile caps, brick walls, service trenches, lift pits, steps,

ramps etc. in top surfaces of plinth filling, at junction of walls and floor,in expansion joints etc. in stages as detailed

in this specifications and drawings. Unless otherwise stipulated, the antitermite treatment will be carried out as

per I.S.6313 (part II) 1981 and/or as per direction of the Engineer-in-Charge.

SITE PREPARATION :

In order to ensure 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 anywhere, levelling pegs, timber off-cuts and other builders 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 percolations.

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 75 mm. atleast.

f) All sub-floor levelling and grading should be completed, all cutting, trenches and excavations should be

completed with backfilling 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 : One of the approved chemicals in water emulsion, recommended by the Indian Pest Control

Association (IPCA), and approved by the Engineer-in-Charge, shall be used uniformly over the area to be treated.

The contractor should produce voucher(s) for the chemical purchased and should get verified the sealed

container(s) of the specified chemical from the Engineer-in-Charge before preparing the emulsion/use for the

treatment.

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 stages of the treatment.

Treatment in Foundation Trenches : In case of normal wall load bearing structures, column pits, wall

trenches and basement, the treatment shall be @ 5 ltrs./sqm. of surface area of the bottom and sides to a height

of atleast 300 mm. After the foundation work, the sides shall be treated @ 7.5 ltrs./sqm. of vertical surface of

substructure on each side. After the earth filling is done, treatment shall be done by rodding the earth at 150

mm. centers close to wall surface and spraying the chemical with the above dose i.e. 7.5 ltrs./sqm.

DAE / DCSEM : 21 : SPN-CVL

In case of framed structure, the treatment shall start at a depth of 500 mm. below ground level. From this depth

the backfill around the columns, beams and R.C.C. basement walls shall be treated @ 7.5 ltrs./sqm. of the

vertical surface and @ 5 ltrs./sqm. for the horizontal surface at the bottom in the trenches/pits.

Treatment on Top Surfaces of 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 upto 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) upto the level of the filled earth surface. To achieved 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 upto the

finished ground level at 150 mm apart and the iron rod moved backward and forward to break the earth and

chemical emulsion poured along the channel @ 7.5 litres ( or at recommended quantity) per sqm. of the vertical

wall/column surfaces so as to soak the soil right upto the bottom. The soil shall be tamped back into place after this

operation.

Treatment for Expansion Joints : The soil beneath the expansion joints 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 :

a) 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.

b) The treatment should not be carried out when it is raining or when the soil is wet with rain or sub-soil water.

c) 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 HEALTH HAZARDS AND SAFETY MEASURES :

All the chemicals mentioned above are poisonous and hazardous to health. These chemicals can have an

adverse effect upon health when absorbed through the skin, inhaled as vapours or spray mist or swallowed. Persons

handling or using these 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 the

safety precautions given in 2.7.2 to 2.7.5 particularly when handling these chemicals in the form of

concentrates

These chemicals are usually brought to the site in the form of emulsifiable concentrates. The containers

should be clearly labelled and should be stored carefully so that children and pets cannot get at them. They should be

kept securely closed.

Particular care should be taken to prevent skin contact with concentrates. Prolonged exposure to dilute

emulsions should also be avoided. Workers should wear clean clothing and should wash thoroughly with soap and

water specially before eating and smoking. In the event of severe contamination, clothing should be removed at once

and the skin washed with soap and water. If chemicals splash into the eyes they shall be flushed with plenty of soap

and water and immediate medical attention should be sought.

The concentrates are oil solutions and present a fire hazard owing to the use of petroleum solvents.

Flames should not be allowed during mixing.

Care should be taken in the application of chemicals/soil-toxicants to see that they are not

allowed to contaminate wells or springs which serve as source of drinking water.

GUARANTEE :

The contractor has to furnish the guarantee for 10 (ten) years from the date of completion of work, stating that in

case of reappearance of termites within the building area due to defective materials or workmanship or due to any

other reasons, the contractor will carry out the necessary post constructional treatment to keep the entire area free

from termite, once again, without any extra cost to the Department during the guarantee period.

MODE OF MEASUREMENT :

The payment will be made on the basis of plinth area measurements at ground floor only for all the stages of treatment

in sqm. correct to two places of decimals. Rate includes the cost of materials, labour and all tools,plants, sprayers required for complete operation.