This system of cavity wall insulation has a defined pattern of holes, which has been tested by the British Board of Agrément to verify that it results in a complete fill.
Also, during your survey, we took measurements of your home including a depth gauge and inspection of the cavity to be filled. From these measurements we know the amount of material required to correctly fill your walls.
The technician will, therefore, check and record this data and match this against the quantity of insulation used. Our internal office staff operate a 100% check of this data and measure your results before we issue your 25 year guarantee.
It is possible that you may also be randomly selected in our on-site technical monitoring.