Skimping on proper insulation in your attic can cost you big later on. The biggest problem is that without sufficient insulation, heated or cooled air will be able to escape from your property. This will increase your energy bills as your HVAC system is forced to work harder to maintain comfortable indoor temperatures. Another issue is that when warm, moist air escapes through your attic, the underside of your wooden roof deck may actually become damaged, causing mold-related allergy and odor issues or even premature roof failure.