![]() Usage increased significantly in the 1970s due to to rising energy prices and they continue to be widely used today. They possessed notably lower thermal conductivities than other materials of the period. PUR and PIR began to be used as building insulation in the early part of the post-war era. ![]() Polyurethane (PUR)/polyisocyanurate (PIR) – thermal conductivity: 0.021 – 0.028W/m.K.The material is spun from molten glass, stone or slag and has been mass produced for the wider construction market since the 1920s. Mineral fibre was first manufactured in the 19th century for industrial applications. Mineral fibre – thermal conductivity: 0.034 – 0.038 W/m.K.An account from Roman author Pliny the Elder describes cork being used to insulate roofs in first-century Rome, while thatched roofs became a common feature of British homes in the Middle Ages. Cork and straw were among the first materials to be used on buildings specifically because of their insulating properties. Cork and straw – thermal conductivity: 0.040–0.065 W/m.K.This means that a reduced thickness of insulation is needed to meet the required level of thermal performance for the complete element (whether it be a floor, wall or roof). The lower the thermal conductivity of an insulation material, the slower the rate of heat transfer and the better its thermal performance.Īs building and production methods have developed, manufacturers have created insulation materials with increasingly low thermal conductivities. This measure is referred to as either the thermal conductivity or “lambda value” of the material and is measured in units of watts per metre-Kelvin (W/m.K). The primary function of any insulation is to resist heat transfer through conduction. This CPD will outline the major options, how performance of the insulation is measured and how to ensure the correct thickness is installed. To get the most from this component, it is crucial to have a clear understanding of the insulation choices that are are available. ![]() Insulation is a fundamental part of any modern construction and the type of material chosen can have a significant impact on how comfortable, spacious and energy-efficient the completed building is. ![]()
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