IKO enertherm XPS is a rigid extruded polystyrene (XPS) board with a Global Warming Potential (GWP) of less than five and achieves a BRE certified Green guide rating of A+ and A, depending on density. A lightweight, lap jointed board with high compressive strength and performance, thermally bonded tri-laminate of polypropylene, spun bonded (outer layers) and microporous (inner layer). Thermal performance of an inverted roof is improved when used in conjunction with IKO enertherm WCL. Used for the thermal insulation of a wide variety of flat roofs including an inverted roof below ballast or paving slabs or a green/garden roof.
IKO enertherm XPS has a compressive strength of 300kpa, but when we are asked to assess the impact of loading on the product, a factor of safety of 2.50 is employed as this is commonly used by the British Board of Agrément (BBA).
Therefore, if it can be shown that the loading will not exceed 120kpa, it will be suitable. If loading's are likely to exceed this figure, then we have an alternative “Super” grade, which is a 500kpa board and can accept loadings of 200kpa.
0.033 W/mK declared thermal conductivity, but for U-Value calculations a design lambda used which is ≥ 100mm - 0.034W/mK, and < 100mm - 0.035W/mK