The need for attic insulation
The purpose of insulation in the attic is to keep the rooms below it warm in the winters and cool in the summers. Insulating the attic includes lagging the floor, walls, and roof of the space. The amount of insulation needed by a house depends on its structure. The main idea in insulating a home apart from maintaining temperature is to allow the roof to breathe. In doing this, air can ventilate adequately, keeping the ceiling at an appropriate temperature in the winters to keep the house warm, but the roof cold, so ice dams do not form within the roof, eventually damaging it. Ventilation in a roof can be provided by installing individual rafter vents to ensure the movement of air. All these works need skill and knowledge that is why even attic insulation in Los Angeles where winters are not cold at all is usually made by professionals.