在200年历史的房屋中绝缘爬网空间
我们有一个项目包括一个250年的老房子uilt on the side of hill that, 17000 CFM @50 pascals. The customer does not have a lot of money, so we are trying to figure out the best way to air seal/insulate the crawlspace. When running the blower door, there is noticeable air leakage through the floor boards and along all interior wall bottom plates. The oil furnace is in the crawlspace and although I would like to figure out a way to condition it all, the crawlspace is uneven and broken up by rock walls as part of the foundation, storage areas, and 5 foot high dirt piles. Our second and cheaper option was to remove the existing R-13 craft face batts in between the log floor joists and spray foam 2″ of cc to the joist bays, the homeowner cannot afford the 2″, so we are down to 1″. However, since we are not doing 2″ and eliminating the batts, I am wondering if we should flash the floor at 1/2″ cc, reinstall or use new batts. My question is twofold, first, are there any other suggestions, and second, if we went with the 1/2″, we would need to re-install the batts to increase R-value, however, I am worried about using the craft facing will somehow create a moisture problem between the foam and the batt. If I take the craft facing off, I will have nothing to staple to the existing log joists. The crawlspace has no moisture issues.
这所房子是一栋历史悠久的房子，看来墙壁已经重新覆盖（猜R-13）。我们还将修复其他一些问题泄漏点（即密封并在楼梯顶部的大型彩色玻璃阁楼进入后面隔离）。窗户是原始的风暴。
There is also a pantry that has no insulation underneath the floors with frozen peaches on the shelf as proof. The house is in Maryland. Thanks in advance for any advice.
GBA细节库
由气候和房屋部分组织的一千个建筑细节的集合
Replies
房主有能力/愿意自己做任何工作吗？
空气密封很有用，但是您在这里谈论的是非常低的R值。在这个问答论坛上没有人建议这样做半次，并且在无条件（不可能条件）爬网空间需求至少R-30上的热边界。显然，在无条件的空间中找到炉子无济于事，因此最好将任何机械设备和管道重新放置到条件空间中，或将爬网空间划分，以便您最终在炉子周围绝缘。重新安装现有的R-13板可能价格便宜，但对房主的服务不是很好，因为他们显然希望减少能源消耗。我建议他们告诉他们正确执行此操作的费用。
Jim,
Trying to help out a client with a low budget by proposing a halfway measure is always a mistake. Do it right or don't do it.
有人需要挖掘污垢堆并清理爬行空间地板，以使其水平并提供良好的访问权限。爬行空间壁需要用至少2英寸的闭孔喷雾聚氨酯泡沫绝缘。
It makes no sense to insulate between the floor joists.
吉姆（Jim），空中销售始终是第一，如果预算是预算，这始终是最好的选择。您的想法可以并且应该在将来添加到上述激进分子所暗示的那样。
Welcome to 2012 and the hugely polarized modern Twitter, blog, Facebook, texting, smartphone world, me included!
Jim - if your customer is on a tight budget, some low cost strategic air sealing can do wonders.
您似乎专注于爬行空间，因为这是您注意到鼓风机门中最多的空气泄漏的地方。鼓风机是一个很好的工具，但有时可能会产生误导。仅仅因为您的地板上有一个“孔”，并不一定意味着空气会渗入该洞。请记住，建筑科学基础知识 - 堆栈效应/热量上升，一个= 1英寸。如果您的结构顶部没有任何孔以使空气脱落，则不会在您的地板上渗入任何空气。
用空气密封在房屋顶部用空气来花钱。这将减少房屋底部的空气泄漏，即使不密封底部的孔。预算计算时，每一点都很重要。如果您密封了50％的孔，您将消除50％的漏气 - 这不必100％完美才能工作。