Where pavers are compacted/jointed in the normal trade way with sand or crushed metal or loose and can be lifted, the accepted treatment method is to lift the lift the pavers and trench the area to be treated. We do not recommend that these pavers are drilled. If the pavers have been concreted or secured in such a way that prevents them being lifted then they will have to be drilled.
Note: where pavers are not able to hold the chemical down at injection causing excessive chemical escape through the jointing then they should be lifted.
Where treatment has been undertaken to houses on infill slabs we recommend at least a 6 monthly inspection frequency on houses treated with a repellent chemical. Where the house has been treated with a non-repellent chemical the inspection frequency can be 12 monthly or less.