Hollow wood veneer ceiling slab for building, has core sandwiched between non-inflammable and micro-perforated wood veneer and permeated Kraft sheet that seals built-up roof, where core is made of mineral wool or glass wool

摘要

The slab has a core sandwiched between of non-inflammable and micro-perforated wood veneer and a permeated Kraft sheet that seals a built-up roof, where the core is made of mineral wool, mineral fiber, rock wool or glass wool, and the Kraft sheet is permeated by phenolic resin. The core is directly glued on a surface of the veneer and the Kraft sheet. The surface of the veneer is perforated between 12 percentages and 30 percentages along desired acoustical correction. The veneer receives triple treatment.