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Table 1. Requirements for Preformed Thermal Insulation – Type 3
Property Requirement
Length –1%, +3% for batts and rolls
–3 mm, +10 mm for boards and sheets
Width –0%, +3% for batts and rolls
± 3 mm for boards
Thickness Mean thickness ≥ the design thickness and none of the individual specimen thicknesses < 90% of the design thickness
–1 mm, +3 mm for boards
Thermal resistance Mean thermal resistance ≥ the design thermal resistance (as stated on the product)
Thermal resistivity ≥ 18.5 (m·K)/W
Surface burning characteristics For Type 3 products, the test values must be reported without reference to the acceptance criteria.
Compressive resistance of draining insulation Not applicable to batts or rolls
Applicable to draining insulation only. Compressive resistance for a 38 mm or thicker draining insulation must be at least 7 kPa at 10% deformation and for thinner than 38 mm it must be at least 10 kPa at 25% deformation.
Water vapour permeance ≤ 60 ng/(Pa·s·m2) for Type 3 products
Boards: applicable to adhered membrane/insulation or to non-adhered membranes
Corrosiveness Boards: corrosion ≤ control
Fungi resistance Boards: growth ≤ comparative item