三、民用建筑的一般规定 规范的第三章为民用建筑,其中的第一节为一般规定。该节中共有17条一般性的规定。 1.当顶棚或墙面表面局部采用多孔或泡沫状塑料时,其厚度不应大于15mm,面积不得超过该房间顶棚或墙面积的10％。 多孔和泡沫塑料比较容易被点燃和快速蔓延,而且它们燃烧时产生的烟气对人体的危害较大。但在实际工程中,有时因功能需要,必须在顶棚和墙体的表面,局部采用一些多孔或泡沫塑料。对此特 Third, the general provisions of civil construction The third chapter of the specification for civil construction, of which the first section is a general rule. There are 17 general rules in this section. 1. When porous or foamed plastic is used locally on the surface of the ceiling or wall surface, its thickness should not exceed 15mm, and the area must not exceed 10% of the ceiling or wall area of ​​the room. Porous and foamed plastics are easier to be ignited and spread quickly, and the fumes they generate when they burn are more harmful to the human body. However, in actual projects, sometimes due to functional needs, some porous or foam plastic must be used locally on the surface of the ceiling and wall. This special