When you insulate, eliminate moisture sources in your house by fixing leaks and using fans that exhaust air to the outside when you cook or bathe. You can also reduce the flow of moisture into insulation if you use a vapor retarder. You can purchase insulation with a vapor retarder on one side. Filling the spaces between wall or ceiling frames does not prevent heat from passing through the frames which you aren't insulating. In fact, it may increase the flow through the uninsulated parts.
Heat flow is especially fast in metal framing.
To insulate properly, add enough insulation to cover the frame as much as possible. This decision depends on several factors. A careful homeowner can often insulate attic floors, basements, new or open walls, and crawl space walls. Wear a respiratory mask. Do not cover or pack insulation around bare stovepipes, flues, electrical fixtures, motors or any heat-producing equipment such as recessed lighting fixtures because trapped heat and blocked air circulation can create safety problems.