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Thinsulex TLX Silver and Thinsulex Gold Foil Faced Loft / Attic Insulation is a thin multifoil insulation that is very flexible to work with for wall and roof type applications. Applications such like being installed under rafters or on top of rafters is acceptable. This product can be installed alongside PIR / Phenolic / Glasswool / Rockfiber type insulations. When installed correctly in accordance with manufacturer's specifications Thinsulex can reduce the thickness of alternative insulation being used alongside Thinsulex. Thinsulex is an airtight vapour barrier that restricts the movement of air from inside and outside the building. Hence enabling the homeowner to keep a more consistent air temperature within their building.