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Are there any special factors which have to be considered when determining the thickness of insulation required for an inverted roof?

April 26, 2017determining factors insulation inverted roof special thickness

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Are there any special factors which have to be considered when determining the thickness of insulation required for an inverted roof?

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Allowance must be made for the cooling effect of rainwater which reaches the waterproofing layer. Normally a 20% increase in insulation thickness is required. However, with the ROOFMATE MinK system the rainwater cooling penalty is reduced to 2% (see Agrément certificate 97/3431). The final U-value required for the roof will depend upon the overall energy performance of the building (see Part L guide for further information).