建筑构件耐火极限和燃烧性能

厂房仓库建筑构件耐火极限和燃烧性能名称一级二级三级四级备注墙防火墙3不燃性3不燃性3不燃性3不燃性甲乙类厂房、甲乙丙类仓库防火墙是4小时承重墙3不燃性2.5不燃性2不燃性0.5难燃性楼梯间和前室的墙，电梯井的墙2不燃性2不燃性1.5不燃性0.5难燃性避难走道两侧的墙1不燃性1不燃性0.5不燃性0.25难燃性非承重外墙房间隔墙0.75不燃性0.5不燃性0.5难燃性0.25难燃性二级耐火等级厂房仓库房间隔墙，采用难燃性墙体时，耐火极限提高0.25.柱3不燃性2.5不燃性2不燃性0.5难燃性一二级耐火等级单层厂房仓库耐火极限分别不低于2.5和2h。梁2不燃性1.5不燃性1不燃性0.5难燃性楼板1.5不燃性1不燃性0.75不燃性0.5难燃性一二级，厂房仓库，上人平屋顶，耐火极限分别不低于1.5和1h。二级，多层，厂房仓库，预应力钢筋混凝土楼板，耐火极限不低于0.75屋顶承重构件1.5不燃性1不燃性0.5难燃性可燃性采用自动喷水灭火系统，一级等级，单多层厂房仓库，耐火不低于1h疏散楼梯1.5不燃性1不燃性0.75不燃性可燃性吊顶（吊顶格栅）0.25不燃性0.25难燃性0.15难燃性可燃性名称一级二级三级四级备注墙防火墙3不燃性3不燃性3不燃性3不燃性承重墙3不燃性2.5不燃性2不燃性0.5难燃性非承重外墙1不燃性1不燃性0.5不燃性可燃性楼梯间和前室的墙，电梯井的墙2不燃性2不燃性1.5不燃性0.5难燃性避难走道两侧的墙1不燃性1不燃性0.5不燃性0.25难燃性房间隔墙0.75不燃性0.5不燃性0.5难燃性0.25难燃性柱3不燃性2.5不燃性2不燃性0.5难燃性梁2不燃性1.5不燃性1不燃性0.5难燃性楼板1.5不燃性1不燃性0.5不燃性可燃性大于100米民用建筑，楼板不低于2h屋顶承重构件1.5不燃性1不燃性0.5可燃性可燃性疏散楼梯1.5不燃性1不燃性0.5不燃性可燃性吊顶（吊顶格栅）0.25不燃性0.25难燃性0.15难燃性可燃性