A quarter of heat loss in an uninsulated house happens through the roof, which is why it is vital to make sure the loft is properly insulated if the house is to stay warm without costing the owner a fortune in energy bills.
There are many different products to choose from when insulating a loft, each with its own benefits and drawbacks. One of the most important characteristics of an insulation product is its U-Value, which measures the effectiveness of a material in preventing heat transfer. If you bear in mind the Energy Saving Trust’s recommended U-Value for an insulated loft is 0.16 W/m2K, that will help you gauge the efficiency of these products.