Inspect area where slab are to be laid and all area under building and removal all timber, root, branches, and the like, before treatment.
Immediately prior to laying membrane or pouring concrete, apply 0.5% solution of aldrin or heptachlor or 1% solution of chlordane in water as barrier at the rate of 5 litres of solution per m2 of ground,continuing treatment 300 mm. byond the free edges of slab and all exposed area under building.