仍在试图了解未通风的屋顶细节
I’ve been posting on here a lot, thanks for the feedback.
我仍在尝试了解一个未通风的大教堂，并在after子之间用刚性泡沫和绒毛绒毛。
1）冰和水盾是否可以涂在护套顶部，上面是刚性吗？
2) If I put down 1×4 straps over the Iso board, do I need any sort of barrier before I lay down my metal? If not, wouldn’t there be a lot of condensation underneath the metal dripping onto the Iso board? Maybe this is OK?
3) Where are the problem spots for air infiltration in these assemblies besides the ceiling? How are they typically addressed?
谢谢
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答复
嗨，乔，
I'm actually in the process of doing this exact same research for a spring build. Here are the answers I have found so far.
1）冰和水盾是否可以涂在护套顶部，上面是刚性吗？是的。防水，蒸气不透水的棕褐色和粘膜是可以的，因为您的天气屏障，空气屏障和蒸气屏障都将在同一层上。顶部的刚性还可以，因为刚性泡沫可以很好地处理一些水和湿度。
2) If I put down 1×4 straps over the Iso board, do I need any sort of barrier before I lay down my metal? If not, wouldn’t there be a lot of condensation underneath the metal dripping onto the Iso board? Maybe this is OK? I would do horizontal, then vertical strapping to allow for any water accumulation to drain/dry out.
3) Where are the problem spots for air infiltration in these assemblies besides the ceiling? How are they typically addressed? your air barrier layer is on the outside. What is important to ensure you have the proper insulation value on the exterior of the roof sheeting to control condensation on the inside layer of your OSB. It seems that 40 percent of the total amount of insulation should be on the exterior and the remainder of insulation should be either cellulose, rockwool or open cell sprayfoam. Alternatively, close cell sprayfoam can be applied to the underside of your roof sheeting, however it's not my first choice since the product is not good for the environment.
乔，
Have you read this GBA article?“如何在屋顶护套的顶部安装刚性泡沫。”
感谢马丁，
我已经阅读了有关该主题的每个单词。我想我只是对特定细节和水分问题感到紧张。因此，所有问题。
乔，
Q. "Is Ice and water shield OK to apply to the top of sheathing, with the rigid on top of that?"
A. Yes, unless you are worried about potential odor issues. (I wouldn't worry, but some people do.) You absolutely need a bulletproof air barrier above your sheathing. If you don't want to use Grace Ice & Water Shield because of odor worries, use one of the European air barrier membranes sold by 475 High Performance Building Supply or Small Planet Supply.
Q. "If I put down 1×4 straps over the polyiso board, do I need any sort of barrier before I lay down my metal?"
A. Yes. Building codes require you to install roofing underlayment (asphalt felt or synthetic roofing underlayment).
Q. "Where are the problem spots for air infiltration in these assemblies besides the ceiling? How are they typically addressed?"
答：问题点是护套接缝和所有穿透（例如，管道排气管）。这些区域与您家中的其他地方有关 - 用高质量的磁带或连续的膜密封，并补充了喷雾泡沫和填缝罐，并通过使用鼓风机测试来验证工作。
Is it interior warm air that is the true threat to moisture buildup?
小小的外部泄漏不关心吗？
由于完全粘附的自愈合膜，例如冰和水上盾，外部泄漏很少见。这些东西可以很好地围绕指甲和螺钉穿透力密封。
But even with #30 felt up top the true primary moisture risk to the roof deck in cold climates is air leaks and vapor diffusion from the interior side.
HI Joe -
改良的沥青膜及其粘附非常取决于温度。我不相信这些膜会随着时间的推移保持密封，尤其是在经历非常严重的温度波动的屋顶上。如果您使用底漆，那会有很大的不同。
And yes, in cold climates, it is warm moist air making its way through assemblies that leads to condensation. But bulk water management is no less important; the mantra is bulk water, air control, vapor control (directional dedicated drying potential), THEN thermal control layer (insulation).
Peter