屋面没漏，地面却总是湿的——多半是冷凝水。湿度高的厂房，这个问题要在设计阶段解决。The roof doesn't leak, but the floor is always wet — that's condensation. In humid plants, solve it at design stage.
食品厂、养殖场、纺织车间这类高湿环境，常见一个奇怪现象：晴天屋面也不漏，但檩条和板底挂满水珠。这是冷凝：室内湿热空气遇到冰冷的钢板表面，析出水分。
治理要在设计阶段做三件事：一是保温层厚度按当地露点温度计算，高湿环境不建议低于 75mm 玻璃棉；二是屋面板内侧加设防潮贴面（铝箔或 PVDC 膜），阻断水汽进入保温层；三是组织通风，屋脊通风器与侧墙通风带配合，把湿气排出去。
已经出现冷凝的厂房，加装内保温与通风改造的成本，远低于不处理——冷凝水长期滴落会加速檩条锈蚀。
In food plants, farms and textile workshops, a strange thing happens on humid days: the roof doesn't leak, yet purlins and sheet undersides drip. That's condensation — warm humid indoor air meeting cold steel surfaces.
Fix it at design stage with three measures: size insulation to the local dew point (for high-humidity buildings, don't go below 75mm glass wool); add a vapor barrier on the liner side (aluminum foil or PVDC film) to stop moisture entering the insulation; and organize ventilation — ridge ventilators plus wall louvers to exhaust humid air.
For buildings already suffering condensation, adding liner insulation and ventilation costs far less than ignoring it — dripping condensate accelerates purlin corrosion.
上海雄岚钢结构 · 出口 60+ 国家 · EN 1090 CE 认证 · 24 小时内工程师回复
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