The balsa sawn boards were tried for manufacturing an insulation board. A total of 32 rough sawn balsa boards, 100 × 25 × 1.5 mm length, were air-dried to 15% moisture content, dressed and machined into tongue and groove (T and G) product. The T and G boards were joined side by side (lamination), bonded with polyvinyl acetate (PVA) liquid wood adhesive to form an insulation board of 4.8 m² wide surface area. After curing of adhesives, the surfaces of the boards were lightly sanded and coated with paints and varnish. Laminated board surfaces exhibited a fine texture due to the use of sharp tools. The application of adhesive and surface coatings enhanced strong bonding and coated fairly well respectively. It was noticed that natural grayish brown colour of balsa appeared orange to yellowish brown after it was polished. The finish laminated products were suggested as suitable insulation board materials for utilization in interior lining purpose with a particular reference to ceiling construction in buildings.
Key words: Balsa wood, wood machining, tongue-and-groove, lamination, lining, insulation board, polyvinyl acetate liquid adhesive, surface coatings.
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