We frequently remove old insulation, before installing spray foam due to some reasons. Firstly, it helps to make better conditioning. Secondly, cellulose and fiberglass are less durable than spray foam. Thirdly, if there is mold in your attic, we can solve this issue. Fourthly, we can disinfect the attic if there are insects or pests. So, the new insulating process will move smoothly and effectively.