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Partial fill cavity wall PIR insulation. Fibre free rigid insulation core with aluminium foil composite to both sides. The boards are conveniently sized to co-ordinate with brick and block dimensions and allow the insertion of wall ties at the appropriate spacing. Eco-Cavity achieves high levels of thermal performance for thinner constructions whilst maintaining a clear residual air gap and effective protection against driving rain. BBA certified Boards are specifically designed to combine accurately with standard sized bricks/blocks Enables easy installation of wall ties Will not rot, sag or decay within the cavity wall Out performs traditional insulants by 50% - you need approximately half the thickness