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  1. OllyH
    Hi all, My self build is a flat roof single story L shaped bungalow. The roof is quite complex in that the L is at 110degrees not 90 and we have a wing at the front of the property that leads off the main dwelling to a garage. The total roof area is 257m2 but some of this is a overhang roof so I only need PIR insulation over 234m2 area. I've had quotes from the main tapered roof suppliers and Kingspan have come out the cheapest at £6.5k (£27.77 per m2) to achieve an average U Value of 0.17. I've then costed using 150mm Celotex PIR boards and timber firrings and this method was coming out more expensive. Has anyone had any experience of tapered PIR? They can be adhered to the OSB deck and GRP can be laid directly on the PIR boards. Seems quite a quick and simple solution and in this case cost effective. Cheers
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