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我如何在未通风的after湾中用玻璃纤维棒的大教堂天花板纠正天花板,现在发出强烈的发霉气味?

Michael Roland|Posted inGBA Pro帮助on

调查发现3个问题:1)无拱形通风孔;2)隔热板延伸到塑料after式通风口的尽头,将空气通道关闭到山脊通风口;3)在墙壁上方没有阻塞以密封玻璃纤维。我已经纠正了前两个,并在内部填补了山脊,但无法修复阻塞。气味持续存在,我担心玻璃纤维被模具污染,复活的气流无法消散。会拔出玻璃纤维(通过拱腹以避免重大解构)并用泡沫工作填充海湾吗?开放的细胞工作是否可以访问封闭电池是不切实际的吗?该组件在板岩下面的内部已经有1/2英寸箔式的Polyiso。- 迈克尔·罗兰(Michael Roland)

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  1. 专家成员
    达娜·多塞特(Dana Dorsett)||#1

    With foil faced goods on the interior you have no real choice but to stick with a vented roof. But the "real solution is to re-build the ceilings (and maybe the roof), converting it into an unvented roof, complying with IRC 2012 presriptive methodologies:

    http://publicecodes.cyberregs.com/icod/irc/2012/icod_irc_2012_8_sec006.htm

    笔记, the foam-R minimums presume the total R to be the full IRC code minimums for those climate zones:https://www.google.com/search?q=irc2012+chapter+11&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a&channel=fflb

    如果您在第4区,并且您没有足够的after脚来真正达到R49,那么您实际上不需要整个R15作为上面的泡沫(或直接在下面,并且与之接触) - 您只需要屋顶甲板需要比较百分比。R15约为R49的30%,如果您只有5.5英寸深的after架,则可以在屋顶甲板上方的R10和R23摇滚羊毛板之间逃脱(R10的30%,占R33的30%)或1英寸的1“屋顶甲板(R6-R7)的底面的闭合细胞聚氨酯和4.5英寸的湿纤维素(〜R16)或压缩的R19牛皮纸面包板(〜R15)和无内部侧面蒸气屏障。

    在美国气候区域1和2中,有一个开放式细胞泡沫的全腔填充物可在3区中变成IFFY(尤其是应用于具有“凉爽屋顶”带状疱疹的OSB屋顶甲板)。但是,如果您在新天花板上使用“智能膜或Intello Plus”,即Certanteed Membrain或Intello Plus等“智能”蒸气延迟器,即CERTANTANTEED MEMBRAIN或INTELLO PLUS,或者(第二最好的),即使是6区,即使是第6区也可以。

  2. GBA编辑
    Martin Holladay||#2

    Michael,
    听起来您有一个结构不良的绝缘大教堂天花板,有几个可能的问题。我认为没有任何中途解决方案可能有效。为了做对,您需要计划进行重大重建 - 可能包括从内部或外部开放rafter湾。

    有关正确执行此操作的信息,您可能需要阅读本文:如何建造绝缘大教堂的天花板

  3. Robert Sanders Jr||#3

    我选择在旧屋顶的顶部建造一个新的屋顶。我通过完全封装原始的after湾,对我的玻璃纤维巴特填充的大教堂天花板进行了翻新。我切断了the绕的尾巴并将其密封,然后密封在旧的山脊通风口上。然后,我在旧屋顶甲板的顶部建立了3英寸的刚性泡沫和半英寸的箔面对聚异尿酸盐,以反射热量,然后是1.5英寸的排气间隙,新甲板和山脊通风孔,从而使旧的天花板结构保持在内部屋。我小心翼翼地密封了旧屋顶甲板上方的所有东西。现在,冬季的房子少得多,夏天凉爽得多。

    BUT, I didn't have to deal with any polyiso on the interior and I am in Georgia (climate zone 3).

  4. Michael Roland||#4

    Thank you for your responses. Brief follow up. How crucial is it that fibrous insulation in vented bays be sealed from outside air? Some details in Fine Homebuilding/GBA show seals, others do not, particularly when using pre-formed plastic rafter vents. Also, when using blanket insulation on an attic floor, isn't that area open to outside air via soffit vents, ridge vent, and/or gable end vents? --MR

  5. GBA编辑
    Martin Holladay||#5

    Michael,
    纤维绝缘层顶层的风洗可以降低绝缘的热性能。如果您使用通风挡板(例如,聚苯乙烯挡板像Propervent一样),则将减少这种风洗的效果。更好的是安装的站点建造的挡板,并关注气密性。

    If your baffle isn't airtight, the flaw is not fatal. But if you are trying to do a conscientious job, it's always a good idea to try to enclose fibrous insulation with an air barrier on all sides.

    Why isn't this done on attic floors? The main reason is that insulation contractors have discovered that it's less expensive to just blow in a few more inches of cellulose to counteract the effect of wind-washing than it is to try to cover the top of the insulation layer with Tyvek.

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