We bought 75 boards of 2.4 x 1.2 m 100mm insulation. 216 square metres in all and have just three left with some offcuts after completing the underfloor installation. We have squeezed in expanding foam between every gap we could to minimise cold spots. We managed to buy these boards last July when the price was 40% below present levels so out squirreling opportunism has worked well for us
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