Xtratherm is committed to supplying the highest quality insulation materials. Production processes are closely monitored to ensure the delivery of consistently high-quality products. We stock a comprehensive range of Xtratherm Thin-R Pitched Roof XT/PR PIR (polyisocyanurate) roofing insulation for use on pitched roofs (ventilated, hybrid or warm) and provides the most efficient U-values with minimal intrusion into valuable living space.