保持一个狭小空隙vented-insulation选择吗?
I live in a 100 year old barn that was converted to a single family in 1971. It has a field stone foundation and a vented crawl space. Beneath the floor and betweent the floor joists is 30 year old fiberglass insulation.
我想改善绝缘材料并消除爬行空间和居住空间之间的任何空气流动。
I’ve read every thing I can find about crawl space design and the merits of enclosing the crawl space and including it as part of the conditioned space. However, i’m wondering if that applies in my case considering there are no mechanicals in the crawl space and there will not be in the future. Can I just better insulate the underside of the floor and keep the crawl space vented?
I thought I could put 6 or 12 mil vapor barrier under the joists, and that would support insulation between the joist. Or better, fasten rigid foam board under the joist and use that to hold additoinal insulation. All joints with either method will be taped and spray foamed for air sealing.
Any major flaws in this thinking? Thanks in advance for any help.
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由气候和房屋部分组织的一千个建筑细节的集合
Replies
史蒂文，
在像您这样的房子里，您可以如果需要，可以离开爬行空间。
如果旧的玻璃纤维棒状恶化，我会把它们扔掉。一旦托梁湾为空，您就可以用喷雾聚氨酯泡沫在托梁之间进行隔热。
If the fiberglass batts are in good shape, you can leave them in place. I would insulate under the joists with at least 2 inches of rigid polyisocyanurate foam with taped seams. This work will be difficult to do well if you have round log joists; however. If you have sawn joists, it should go fairly smoothly. Use caulk or canned foam as necessary to assure an airtight installation.
通过the way, what's your climate? How do you keep your plumbing pipes from freezing?
谢谢你回复马丁。我忘了提到我在5A区（马萨诸塞州）。
我将处置旧玻璃纤维棒，因为它们状况不佳，多年来一直是许多小动物的家。真正的挑战将是访问...在某些地方，爬网空间非常浅，我需要进行一些挖掘，只是为了获得足够的空间才能靠在我的背上。我研究了喷雾泡沫，但这很昂贵，我仍然需要做一些挖掘，以便安装人员到达那里。
在这种情况下，很高兴听到保持通风孔打开是一种选择。
编辑以补充说托梁是锯，而不是日志。
You have a vented crawl space in Massachusetts and your plumbing pipes don't freeze? What do you use -- electric heat tape?
爬行空间有通风口，但并非所有爬行空间都排放。这是因为谷仓的原始托梁实际上坐在土壤上，而在这些托梁的顶部建造了一套较新的托梁。因此，并非所有的爬网空间都暴露于外部空气，但也不能很好地隔热。
水的主要位于霜冻线下方，即将进入房屋约12英尺。进入房屋的水主的垂直部分包裹在许多绝缘材料中。没有热胶带。到目前为止，一切都很好，但是我想第二天或两天将是测试，因为我们几年来这里度过了最冷的天气。
史蒂文，
由于您将要删除玻璃纤维“ Nest”，因此您可以考虑将其替换为硼酸盐处理的可回收蓝色Jean Batts（如果托梁间距是常规的）。它比玻璃纤维更难切割，但对啮齿动物的昆虫不会有吸引力。
正如马丁所建议的那样，您需要在托梁和用箔胶带胶带下涂抹2英寸箔脸的Polyiso板。这不仅会消除托托梁的热桥梁，而且还可以从冷地板上放射一下地板。。
感谢您的输入罗伯特。幸运的是，我找到了当地的可回收牛仔布隔热材料的供应商，现在我的房子里坐着几100平方英尺。我需要更多。但是不幸的是，我发现这所房子里没有什么是常规的！因此，将涉及很多削减。
对于刚性板，我假设像陶氏凝灰岩R这样的产品？
New questions as my project moves along...
据我所知，代码要求在温暖的一面使用蒸气屏障，因此在我的情况下，这意味着托梁之间的隔热层下方的蒸气屏障。我认为设置是水平墙组件。
--My plan was to use rigid foil-faced foam under joists to address thermal bridging. If I add additional insulation between the joists and add vapor barrier on top of that, am I creating a bad situation (no way for moisture to escape through foam or through subfloor)?
--Batts would be difficult to place between the joist because they would have to be cut in half the long way. So I think loose fill insulation may be the easiest thing to do. If it settles and I have an airspace under the subfloor, is that a problem? I'd rather not dense pack because that would be harder for me to do myself.
Thanks.
史蒂夫
史蒂夫,
Q. "The code calls for vapor barrier on warm side."
A. No, building codes call for vapor retarders, not vapor barriers, on the warm-in-winter side of some walls and ceilings, in some climates.
Q. "In my case that would mean vapor barrier under subfloor above insulation that is between the joists."
A. No it wouldn't, because as far as I know there is no code requirement for vapor retarders in floors. In any case, plywood and OSB both qualify as a vapor retarder.
Q. "My plan was to use rigid foil-faced foam under joists to address thermal bridging."
答：这将起作用。
问：“如果我在托梁之间添加其他绝缘材料，并在其中添加蒸气屏障，我会造成不良情况吗？”
答：在托梁之间添加额外的绝缘材料是可以的，但是忘了在托梁之间的绝缘层之上添加额外的蒸气屏障。
Q. "I think loose fill insulation may be the easiest thing to do. If it settles and I have an airspace under the subfloor,is that a problem? I'd rather not dense pack because that would be harder for me to do myself."
A. I suggest you install unfaced fiberglass batts or Roxul mineral wool batts. Install oversized batts so they stay in contact with the subfloor.