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Table 1. Requirements for Preformed Thermal Insulation – Type 1
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 1 products not intended for exterior of basement walls: Flame-spread classification must not exceed 25; smoke-developed classification must not exceed 50.
Smoulder resistance Applicable only to Type 1 products, not intended for exterior of basement walls. Mean mass loss ≤ 2% and each specimen ≤ 3%. Smoulder zone must not reach specimen periphery.
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 Batts and rolls: not applicable for Type 1 products
Boards: applicable to adhered membrane/insulation or to non-adhered membranes
Corrosiveness Applicable to Type 1 batts and rolls
Boards: corrosion ≤ control
Fungi resistance Applicable to Type 1 batts and rolls
Boards: growth ≤ comparative item