防止封闭的门廊中的凝结
您好，我们建造了一个新房子，并设有一个附有20x20英尺覆盖的门廊。我们在安大略省。就在渥太华以西约200公里。我认为气候区5。
我确实向GBA社区寻求有关此房屋建筑的建议，非常感谢！
我们现在遇到的问题是，盖有盖的门廊打算是一个3个季节的房间，可以在冬季使用，并能够在冬季加热。因此，它是2×6 16oC，带有R24围兜和R10 GPS护套。R70在天花板上吹，R21 CC喷雾泡沫地板，然后在托梁之间进行R21板，然后R10 GPS板盖托梁，然后是soffet。地板在2英尺至10英尺处的2侧开放，因为地面倾斜到我们的后院。它在浮动侧的螺丝桩上，主侧的ICF粉底墙。
2个外墙中的大多数是大防晒屏幕窗户，所以一个薄的聚窗。非常漏水。无r值。房间里有一个良好的密封木燃烧壁炉，带风扇和一个小型电加热器。
So here is the issue. We are using it more then expected in the winter. When we warm up the room frm minus 15C it takes 5 hrs with a fire. Then when it cools, water is condensing above the ceiling vapour barrier. We have water puddles above the ceiling vapour barrier. They turn to ice until was warm it up again. We want to change out the windows to triple pane casments so we can still open up the screen room in the warmer months. Then warm the room permanently to maybe 10 or 15C and warm it up a bit more when we use it.
Would anyone have a solution. I think the floor is insulated sufficient. Would anyone add more to the floor? Enclose the floor to keep wind out? Heat loss it dominated by the windows that need to be changed. Would anyone add a minisplit for heat and air conditioning?
Thanks so much
我会尝试发布图片
NOTE: The area in the pic that looks like batts in the ceiling is under our bedroom. Behind those r20 batts is 4 or 5inches of CC sprayfoam. That’s why there is no vapour barrier in the spot.
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水量增加吗？可能是屋顶或管道泄漏吗？更多图片包括外面的一些图片。沥干水，看看它是否复发。
感谢您的想法。我们将肯定会在天花板上进行天花板和视觉检查。
现在的屋顶正处于雪下，并且门廊中没有管道。这是带有隐藏紧固件的金属屋顶。全新的。泄漏极不可能。首先，水在天花板上的小隔离水坑里收集。整个屋顶金属都需要散落的许多小孔才能做到这一点。就像在屋顶组件中需要下雨一样。
水只会增加在我们一个温暖的房间d let it freeze again. I'm confident this is condensation on the poly as the room temp, and therefore poly and insulation move to above dew point (22C last night) when we warmed in up, then fall to way below freezing again.
我希望这有帮助。
Thanks
How is the roof over the area vented?
Since the vapor barrier is the warm side air barrier, is it continuous and well sealed around the perimeter? Is the vapor barrier connected to the SPF under the bedroom?
如果您要在多个侧面上凝结，则通常意味着内部的温暖潮湿空气进入屋顶，无法逃脱。当空间冷却时，这会凝结并滴到多个。
天花板上的水还是在某些地区？您有很多屋顶/墙连接点需要详细的闪光灯。我仍然怀疑您外面有某种泄漏。冰堵住了。您的使用变化会使情况变得更糟，更加热/冷却周期。
感谢您的输入。
Akos，屋顶是金属屋顶上的全长脊通风口。摩尔通风口和拱腹。我们需要进入那里，但不应被阻止。
蒸气屏障密封很好。我们将要查看它以确保，但是据我所知，没有针孔可以泄漏到房间组件中。
In my mind warmth is getting above the poly because heat goes right through the vapour barrier. The air up there is already laden with moisture so it's just the warmth causing a dew point?
Johnathan, the water is all over the ceiling in small puddles above the poly. No rivers, but doesn't seem to be running anywhere. I did see the construction of the and I think flashing was very well done but it is possible their is a leak. We will look for one once we get up there.
Darn, this seems like a big problem!
Again thanks for the input. Will inspect for ventilation and leaks.
VB中的针孔不是问题。要么通风孔无法正常工作，要么您会从房屋泄漏到门廊上方的阁楼上。
Looking at the picture, that is not a simple intersection with the room overhang into the porch roof, typically these intersections are hard to air seal properly. Hard to see, but the ridge cap doesn't look like a vented one.
如果排序空气泄漏/通风，门廊上方的阁楼空间中的空气应始终留在室外露点附近。加热Poly不会影响这一点。这意味着即使房间冷却，您也不应该在多个侧面看到任何凝结（或仅仅是很小的凝结）。
谢谢！知道了。因此，回顾一下，您怀疑它是空气泄漏或排气阻塞。明天我会和我的GC一起研究。
Thanks for the info. GC and I have looked and we believe it is the vapour barrier. As suggested above, it is complex to seal it given the bedroom above and steel beam down the center. There are many spots that warm air and vapour are able to get into the roof assembly.
So now we need to fix it. My first thought was to build down the ceiling with 2x4 and spray foam the entire thing with 2" CCspf. Air and vapour seal the entire thing tight as a drum. It adds R14 approx to the ceiling too.
I would appreciate any thoughts.