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J Waterproofing
J21 Mastic asphalt roofing/ insulation/ finishes: 10, 110, 115, 120, 125, 130, 135
J31 Liquid applied waterproof roof coatings: 5, 10, 110, 120, 130
J41 Reinforced bitumen membrane roof coverings: 10, 12, 110, 115, 120, 125, 130, 135
J42 Single layer polymeric sheet roof coverings: 10, 110, 120, 130
N Furniture/ Equipment
N10 General fixtures/ furnishings/ equipment: 40, 350
N25 Permanent access and safety equipment: 10, 20, 210, 220