如何隔离具有6英寸贴面的无外壳外墙？
Greetings
I am in the process of renovating a 1920 bungalow in Kansas City, MO., zone 4 or 5. I wish to make it as tight and efficient as possible, maybe even net-zero with a 6.3 KW grid tied PV system. I have it gutted now as the combination of neglect, a failed tile roof and unique original construction shortcomings made saving any of the interior impossible.
One feature of this project has me and everyone I’ve talked to flummoxed. The house has beautiful stone veneer that is in fantastic shape that must be saved. The exterior walls are of 2×4 construction with no exterior sheathing, just the back of the stone veneer. The walls had never had insulation in them.
The veneer is fairly watertight, with only a little re-pointing needed, though I can tell that some liquid water has gotten though in the last 96 years. There is no deterioration or frost damage I can detect, even on the porch stonework.
I’ve had suggestions to fill the walls, from the back of the stone in, with closed cell and/or open cell foam, with/or/without house wrap to create a rain screen, or shoot 2″ of closed cell on the back of the veneer then dense pack cellulose, or cut and cobble foam into the stud bays. None of these suggestions strike me as entirely appropriate.
我的问题是：是否有一个壁系统可以在保持石材和木材结构的完整性的同时提供最大的空气密封和R值？（最好在不增加壁的厚度的情况下尽可能负担得起。）
I have attached 3 images: the outside of the house, a photo of the interior wall and a wall section drawing I made.
Thank you for any suggestions.
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Replies
吉姆，
Step one: Consult an engineer to determine whether these unbraced walls need any bracing. (It's probable that the only bracing was provided by the lath and plaster.)
Step two: Read this article:Insulating Walls in an Old House With No Sheathing.
我建议使用附带WRB附带的三维塑料网格产品 - 一个品牌是Home Slicker Plus Typar, but there are many similar products on the market. You may have to cut this product into relatively narrow strips to wiggle it behind the studs. Once this product is installed against the stone, you can come up with a plan to insulate.
-- Martin Holladay
Thank you for speedy answer.
As to step one, you are right and I have addressed that with and engineer and wall bracing, you just can't see it in the photo.
在第二步中，我阅读了您提到的文章，并为我回答了很多问题。因此，我的看法是，我需要一个排水平面，空气密封，蒸气屏障，绝缘层和内部墙壁盖。看起来像一层，例如1英寸的闭孔喷雾泡沫，一镜头满足了空气密封和蒸气屏障的需求，尽管它是昂贵且无绿色的。然后，我可以在其中使用任何绝缘材料。巴特。
Any other ideas? What would you do if it was your house?
谢谢
Jim Gottsch
吉姆，
Flash and batt is probably a good approach. If you use something like Home Slicker Plus Typar, make sure that the WRB faces the interior (so that the spray foam doesn't clog the plastic mesh).
-- Martin Holladay
Flash 'n' batt is fine if it's milled lumber dimensions on standard spacings. But it looks like full-dimension 2x4s, possibly on something other than 16" o.c. spacing. That makes properly fitting batts real PITA, enough so that blown or sprayed insulation.
Even if the spacing is 16" o.c., a full dimension 2x4 cavity is a full half-inch narrower than standard milled lumber, which can make some batts buckle unless trimmed, and trimming 1/2" off the batt edges to fix it isn't exactly quick or fun.
KC处于第4区的凉爽边缘，即使是第5区，也没有木材护套来积聚冬季水分，它也不需要在组件的两侧都有蒸气屏障（低于65F，这是KC中的仲夏平均户外露点）。您可以使用喷洒在家用Slicker Plus Typar上的开放式细胞腔填充物，然后进行一次拍摄。四英寸的开放单元具有与1英寸闭孔相同的聚合物，并使用水而不是HFC作为吹剂。一个英寸的闭孔也不一定是空气密封件，而是在3英寸或更多的开放式空气密封件细胞几乎可以。
Save the high impact closed cell stuff for the rubble foundation, where the low vapor permeance and waterproof characteristics actually buy you something.