大教堂天花板的曼萨德屋顶的外部泡沫
我需要一个理智check on the proper application of exterior rigid foam with a complex Mansard style roof.
我们只是在80年代建造的房屋上关闭，该房屋需要一个全新的屋顶。当前的屋顶似乎已于1986年安装，并且已经过去了。
现有的结构是独一无二的，面临着一些挑战。
The architecture includes a large Cupola in the center, 2 large barrel shaped dormers that taper up the roof and an eyebrow section over the front door with a complex, convex shape.
The interior is a vaulted ceiling with exposed structural trusses and a tight drywall ceiling. (see photo)
整个上层只有2个嵌入式灯可以灯光，因此天花板上似乎相当密封。屋顶桁架似乎为2×10，在干墙上方的桁架之间的空间中，R-13或R-13似乎包括2×8，带有R13或R19。
我对屋顶绝缘的可见性为零，只是从热图像来看。整个房屋的上层只有一个小8×8的“阁楼”空间，当然，它装有HVAC单元。阁楼中没有管道。
I am assuming that there is some airspace between the current insulation and the roof deck, per common practice and gravity since it’s 32 years old.
我很难找到理解该概念的屋顶工，更不用说是执行的，对结构护套的外部刚性泡沫。
The discussions start with “the roof needs to breath” then I point out the current roof is unvented.
其次是“我们可以使用一些凉爽的屋顶瓦，它将做同样的事情”。
然后，它推动了添加辐射屏障，覆盖了整个曼萨德墙，果皮和棍棒等。
I’m using the detail image found in the detail library (attached) to try and relay the concepts.
Is this detail suitable for adapting to a Mansard roof?
I can’t think of any reason why it would not apply.
我要在接缝处涂上结构护套或液体，交错的Polyiso泡沫为2-3英寸，再次粘在接缝处，然后是钉子，交感神经底层和带状疱疹。
我是在思考还是错过了什么？似乎并不那么复杂。
我知道屋顶将比正常人“厚”，并带来其他筋膜细节。我们甚至可能不得不在眉毛座椅上逐渐缩小一些面板的缩小，但顶部没有任何尺寸。
Finally, I know I’ll be replacing some of the roof decking based on the condition of the shingles. I assume since we are using exterior foam, I can just add insulation to the exposed cavities and not worry about any air channel below the structural sheathing given the exterior foam.
GBA细节库
A collection of one thousand construction details organized by climate and house part
Replies
杰森，
You're in a tough situation due to the curves on this roof. Adding rigid foam above this roof is a challenge. It would involve the use of multiple layers of thin rigid foam (perhaps 1/2-inch foam) in the curved sections, or judicious use of spray foam in the curved sections, along with custom-made framing members above the roof sheathing to handle the spray foam.
It might be doable, but it's a challenging job, both in terms of craftsmanship and aesthetics. It would also be very expensive.
我认为您应该使用常规的屋顶方法（没有任何外部绝缘材料）更换屋顶，然后撕下干墙天花板。在内部使用闭孔喷雾泡沫（换句话说） - 换句话说，是闪光和棒状的方法 - 然后是新的干墙。
有关更多信息，请参阅"Flash-and-Batt Insulation."
Thanks for the input Martin, I appreciate it.
I'm trying to avoid tearing out the sheet rock due to the complexity of the interior finishes. The sheetrock guys really do not want to replicate the interior barrels and they won't even quote it out, just T&M.
如何在枪管上使用1/4英寸薄板泡沫并凸出部分，或者根本不为这些区域泡沫呢？
它不会像其他空间一样隔离，但是这些细节占总面积的10％，因此至少我会改善其他90％。
我还认为可能像弹性板隔热材料一样可以确认曲线，但是木瓦仍需要钉子，因此将这些腔塞满并且不尝试从这些斑点中的顶部隔离，这可能更有意义。
can you remove the roof sheathing, and existing insulation, and fill with spray foam? seems like it would be cheaper than removing the drywall
The location/climate zone of this place is... ??
经验丰富的泡沫安装程序可以将其块或合适厚度盖的多叶块带到屋顶甲板上，可以将相当一致的2磅泡沫的深度放在几乎任何弯曲的表面上。将泡沫放在适当的情况下，2x4卧铺可以用煎饼木螺钉拧入结构屋顶甲板，可以将钉子甲板固定在其上。
With more environmentally friendly HFO blown closed cell foam it'll run about R7/inch, and code compliance can be made on a U-factor basis rather than R value, to keep the added thickness to reasonable levels. With the pre-existing enclosed cavities & fluff and the extra air films & R value of the vented nailer it probably won't take more than 4" to get there with HFO blown 2lb foam even in colder climates. At the 3" closed cell foam itself is structural, and is it's own weather resistant barrier- no need for peel & stick membranes. (The nailer deck still needs #30 felt under the shingles.)
每平方英尺的深度为$ 125-1.50，这并不便宜，但又一次又不是1/4英寸刚性泡沫的十二层。
对不起，达娜，你想我记得要添加。
邮政编码为35244区3
我终于找到了一个屋顶工，他在屋顶甲板上完全了解Polyiso，他完成了马丁从刚性泡沫中说话开始的工作。
He says that there is no way to add the rigid foam without a ton of flashing due to the changes in thickness. There is just no way to make it look right with the dormers and eyebrow. So we are back to adding insulation where possible under the decking.
我还与屋顶机一起看了一位泡沫专家，他们担心由于甲板被绑在桁架上阻塞通道的情况下，他们无法在所有必需区域中获得泡沫，所以我认为内部泡沫也出现了。
因此，鉴于外部泡沫已经熄灭，在泡沫中吹出了，还有什么可以考虑在他们可以进入的区域中尽可能多地填充蓬松的绝缘材料吗？
I was planning to use Rockwool on top of the current fiberglass for areas where the decking is completely replaced or should I just save that extra expense and add more fiberglass?