| 摘要 |
According to the invention there is provided a ceiling board (10) which comprises first and second corrugated sheets (12 and 14) sandwiched between first, second and third flat sheets (16, 18, and 20) respectively, all of virgin paper. The first flat sheet (16) has a weight of 250 g/m<2>, the two corrugated sheets (12 and 14) a weight of 160 g/m<2>, and the second and third flat sheets (18 and 20) a weight of 225 g/m<2>. A sealing layer (22) having a weight of at least 8 g/m<2> is applied to the exposed outer surfaces of the first and third flat sheets (16 and 20), to cover 70% thereof. The total weight of the ceiling board is therefore in the order of 1.034 kg/m<2>. Due to the light weight of the ceiling board (10), the transport and installation cost thereof is relatively lower than that of conventional ceilings.
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