This partial fill cavity wall insulation board measures 1200 x 450 x 75mm and is made from rigid polyisocyanurate (PIR). It is intended for use within masonry cavity walls where thermal insulation is required, while still maintaining a residual air gap for moisture management.
Typically installed during new builds or refurbishments, the board fits between wall ties as brick or blockwork progresses. Its 75mm thickness offers a practical balance for meeting insulation requirements without increasing wall thickness, making it suitable for both residential and commercial applications where efficient thermal performance is needed.
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