The Unilin (Xtratherm) Thin-R Cavity Wall PIR Insulation Board is a high-performance insulation solution designed to fit standard wall tie spacing. Measuring 1200 x 450 x 75mm, this board provides superior thermal performance with its precision-cut dimensions ensuring minimal gaps and heat loss. Its unique composition allows it to resist moisture and retain its insulating properties, making it an effective choice for cavity wall insulation.