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|Article||Thin-R Loft Decking XT/Walk-R is a composite of high performance PIR insulation with tough OSB board that provides safe access into insulated roof spaces. XT/Walk-R maintains very high insulation values and complies with health and safety guidelines. Whether building new or upgrading, due consideration towards the energy efficiency of your home can have many benefits, including reduced energy costs and improved living conditions. One of the easiest and most cost effective measures to take is to insulate the roof space. But how do you allow safe access to this space, water tanks, services and fittings? XT/Walk-R is the solution and provides safe entry as well as improved insulation of the attic space. Specification Clause The roof insulation shall be Xtratherm Thin-R Walk-R manufactured to EN 13165 by Xtratherm, comprising a rigid Polyisocyanurate (PIR) core between low emissivity foil facings bonded to OSB board. The Walk-R 86mm with _ _ _mm Mineral Wool to achieve a U value of _ _ _W/m2 K for the roof element. To be installed in accordance with instructions issued by Xtratherm. Refer to NBS clause P10 10, P10 135. Resistance ‘R’ Values The resistance value of any thickness of Xtratherm insulation can be ascertained by simply dividing the thickness of the material (in metres) by its agrément declared lambda value, for example: Lambda 0.022 W/mk and thickness 50mm -> 0.050/ 0.022 -> R-Value = 2.25. R-values should be rounded down to the nearest 0.05 (m 2 K/W). Da|