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The Sun foil is an insulation material which can be used to insulate roofs of residential buildings which causes less energy to accomplish a comfortable temperature inside the building. It’s becoming popular in Sri Lankan building construction sector. The efficiency of the Sun foils is done for commonly used brands. The important thermal properties are analyzed for Sun foils with a thickness of 3mm, 5mm and 8mm and it is tested using a miniature building model for the further evaluation of the efficiency. The aluminum layer of the Sun foils could reflect most of the radiation back and the polyethylene foam layer could keep a temperature gradient of a few degrees. Thermal insulation is a method to reduce the heat transfer of the building. An insulated house is more comfortable as the temperature remains consistent over weather changes such as rising daytime temperature. Thermal insulation of exposed roofs is a very effective method for a country like Sri Lanka near equator as the solar radiation incidents throughout the year and roof is the main surface which absorbs and conducts heat into the building. Employing an insulation material, the heat transfer can be controlled to attain a comfortable environment inside the building.

Sun foils which are widely used in roof insulation can be identified by different names such as heat foils, aluminum foils, roofing foils etc. Generally, Sun foils is a polyurethane or polyethylene foam layer of various thicknesses (3 -12 mm) with a reflecting thin aluminum layer. The aluminum layer helps to have a shiny look and a corrugated surface to the Sun foils.

The top layer of the Sun foils is an aluminum foil which is made by an aluminum alloy that contains 92 – 94 percentage of aluminum. It is used to manufacture thermal insulation for the construction industry, fin-stock for air conditioners, electrical coils for transformers, capacitors for radios and televisions, insulation for storage tanks, decorative products containers and packaging.

The polyethylene foam layer of the Sun foils holds a significant importance in resisting the heat flow through it. The Sun foils with different thicknesses of the Investigating the thermal efficiency 3 polyethylene layers are available in the market. Polyethylene foam as a porous material has an irregular inner geometric structure. Polyethylene or polythene which has the IUPAC name polyethene or poly (methylene) is a thermoplastic commodity heavily used in consumer products.