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The build up of the loft space where my MVHR and hot water cylinder are going was going to be like this: Steico Flex has been in short supply for months. We placed the order at the beginning of August and were told it was a 10-12 week lead time but we would have it in October. Today my builder got a call from the supplier who cancelled the order. Calling round today we are getting even longer lead times of 12-14 weeks (From now). My builder is in a rush and wants to use PIR instead of the 140mm Steico Flex. I'm not keen on this at all because this build up was designed (together with the external layers of the roof such as the sarking board) to give us a decrement delay of about 8.5 to 9.5 hours. Not as good as the ideal 11h, but still much much better for keeping the house cool than PIR. My builder says it's just the MVHR and hot water cylinder room so it doesn't need to be kept cool. There is not much linear metres of MVHR pipe in that room, as although all the pipes start and end there, they leave the MVHR room within 3m or 4m at most. We have enough Steico flex for the the actual living spaces in the roof (where the build up is 160mm of steico instead of 140mm and we also have additional 40mm of hard wood fibre, so 200mm in total). What should I do: just make the builder's life easy and go with PIR for the section of the roof that encloses the MVHR and cylinder room, or try and find an alternative supplier or alternative product? (I've already called 4 suppliers any nobody has Steico flex in supply.)

Even though I ordered 15% wastage we are short by 110 tiles. Don't ask why! They are 330 x 226mm in size, Sandtoft 20/20 interlocking clay tiles in Antique Slate 68. If anybody has any spare, I will gladly buy them off you. Otherwise I'm looking at a 16 week wait to finish my roof. ☔

My build up for the walls and roof includes a layer of 40mm Steico Protect dry internal wood fibre board. This is out of stock with all the merchants I have approached (Mark Wye, insulationsuperstore and ecomerchant) and most are quoting very long lead times of up to 10 weeks. Can anybody suggest an alternative which would have the same decrement delay properties. Someone has suggested Phenolic Foam based product Kooltherm K7, made by Kingspan, on the basis that it has a density of 200kg/m3, but I don't think it will have the same decrement delay just because of the density. Any thoughts?