刚性泡沫绝缘在旧砖房
嗨，我希望有人可以帮助我有一个绝缘局面，我面临着我的1895年砖房。在房子里，没有任何绝缘，我刚拆掉了所有的膏药墙壁。我不想用2×4框架框架框架，以允许所需的空间进行喷雾泡沫绝缘，并且实际上听说喷雾泡沫对于旧砖墙来说非常糟糕。此外，这将迫使我在已经小房子里丢失内部方形镜头，并破坏我所有的窗户和门框，非常昂贵。我去除的石膏和车床都附着在1英寸的垂直毛刺条上，砖墙间隔16英寸的砖墙上仍然完好无损。我认为最好的解决方案是将1英寸的Rmax Polyiso板用面向毛茸茸条带附着1英寸的Rmax Polyiso板，留下柱义索板和砖之间的1英寸间隙，然后在聚四诺板上干缝。我会把所有的接缝卷曲，尽我所能地密封在地板和天花板上的边缘。这不会给我一个我需要的uytate ny的r21代码要求，但我的建筑检查员告诉我，自从我的房子如此旧以来，我不需要要为绝缘编写而不是绝缘，并且由于使用喷雾泡沫实现r21来损坏砖墙。有谁可以帮助我决定我的计划是否使用面向Polyiso面板的1英寸箔是一个好主意？ Would using the Rmax Durasheath panels be better than the foil faced panels? I would also insulate the attic to R38 with Batt insulation. Thank you! Any thoughts and info would be greatly appreciated!
Armen
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答复
Armen,
I suggest that you read this article:绝缘老砖建筑。
Martin: USER-7032327 signed off with the name "Armen".
Armen: The 1" continuous layer of foil faced foam mounted to the 1" furring would probably work just fine, but it may also be fine to strip the 1" furring and install 2" of polyiso, which would have substantially higher performance. But it's complicated, and a better understanding of the wall construction, roof overhangs & building height would be necessary to comment any further.
达娜，
谢谢。
Armen,
Agreed with Dana, the 1" gap is overkill on a brick wall retrofit. You're not going to have any new mortar squeezings to clog your drainage gap. You could get away with doing a skinnier drainage gap, a product like重力腔这将保持排水隙，让您放入另一英寸的绝缘层，或者在其中使用带有凹槽的绝缘板保持间隙。如果你走这条路线，请确保在墙壁的底部，任何累积的水分都有明确的路径排出。不确定您的闪烁方案目前的样子。Joe Lstiburek有一篇文章Rebuilding Houston此过去跌倒，与您的情况相比，与绝缘，排水和闪烁有一些相似之处。
马丁的文章发出了一个好点 - 如果你的墙壁脆弱，你可能不想隔离它们。
Thanks Martin and Dana. Martin your article is very informative. Dana, the roof is a low pitch hip roof with around 15 inches overhang. It’s a two story brick house roughly 25 feet high. The brick walls are triple wythe on the first floor and double on the second floor. I had contemplated ripping the 1 inch polyiso panels into 16 inch wide strips and attaching them directly to the bricks between the furring strips then putting another 1 inch full panel over that to get the two inches and higher r value but I have been told hat it is important to keep an air gap between the polyiso and the bricks to they can dry out and breathe. It is for this reason I am concerned about doing spray foam directly on the brick. I also hate the idea of having to frame out the rooms with 2x4s to accommodate the foam. I think the polyiso boards make the most sense from a cost standpoint and for the health of my bricks but curious to hear what you guys think? Thank you!
Armen,
My article,绝缘老砖建筑, summarizes the best advice available from the most experienced building scientists in North America. Briefly, you need to correct water-management details on the exterior of the building to minimize wetting; you need to evaluate the soundness of the bricks; and, if the bricks prove to be durable enough, consider installing a limited amount of closed-cell spray foam on the interior side of the bricks.
但如果你不相信这篇文章，很难为你提供进一步的建议。
You wrote, "I have been told" -- by who? -- "that it is important to keep an air gap between the polyiso and the bricks to they can dry out and breathe. It is for this reason I am concerned about doing spray foam directly on the brick."
由您来评估您的信息来源。如果您的来源似乎是基于证据的，并且对您似乎比John Straube和Joe Lstiburek的建议更为信誉，那么我猜你应该从这个其他来源寻求建议。
There are many problems associated with your idea of keeping an air gap between the insulation and the bricks. Here's one: hidden air pathways are common in older homes. If interior air is allowed to flow into a gap between the insulation and the bricks, condensation and frost will build up on the interior side of your brick wall. You don't want that.
Thanks Martin - do you think I can have spray foam applied to the walls in between the existing 1 inch Furring strips? Or I suppose I could add another 1 inch furring strip to the existing ones to make two inches of furring strips and the spray foam could be applied to that getting me 2 inches of closed cell spray foam? Or do you think a one inch flash spray is better for an old brick house since you advise installing a “limited amount”?
Armen,
我打算再次推荐给我的文章，绝缘老砖建筑。阅读文章。
确定您是否可以在内部的旧砖砌建筑的墙壁上绝缘取决于风险评估的结果。如果您觉得有资格执行此操作，或者您可以聘请经验丰富的顾问为您进行风险评估。
Depending on the results of that risk assessment, you may be able to install interior insulation. The thickness of the insulation will depend in part on the qualities of your bricks, and the exposure of your bricks to wind-driven rain.