It totally depends on the situation of attic. It is not necessary to remove the existing but if your insulation has been excessive moisture or you have experience insects or rodent. Its recommended to remove old insulation as it may contaminated with bacteria, mildew, rodents, insects and other contaminants. Proper insulation removal requires special machineries. Coolia.com offers insulation service in some areas.
All type of insulations are good but it depends on the area to be insulated and the most energy efficient approach may involves combination of several types and the best option will be reviewed by us depending on budgets and needs during insulation.
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