This board is a 1200 x 450 x 100mm polyisocyanurate insulation panel designed for use in partial fill cavity walls. It features aluminium foil facings and is typically positioned between the inner and outer masonry leaves to help reduce heat loss.
The dimensions are suited to common wall layouts, supporting faster installation and consistent coverage. On site, installers often use this type of insulation to achieve the required thermal values while leaving a residual air gap to assist with moisture management.
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