I have purchased insulation panels for my flat roof the specification on my plans are for Kingspan TR 26 120 which is what I ordered and have paid for, however. There are no markings on the boards to indicate who made them. The product code from Kingspan is ITR followed batch numbers depending on thickness thickness. These do not appear anywhere. I have called and emailed Kingspan for two days with no response to mail or callback. There is nothing on the website. The only thing I have is the merchants delivery note from the driver which is just a piece of paper. Just how do you know if you have the genuine article ?
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