添加天花板绝缘...
我儿子的房子在卧室天花板上方有R-38玻璃纤维巴特（12英寸）。上面有通风阁楼空间。While the R-38 may be a decent # in theory (though R-50 would probably be the current zone 6 amount), I’m thinking the air sealing capability here is slim to none (below batts is the kraft facing stapled to joist bottoms and 1/2″ sheetrock.
我们正在考虑增加隔热材料的实用方法。一个会在纤维素中吹。易于执行和合理的成本，但不要认为这会增加空气不渗透性（在此应用程序中不是密集的包装）。首先压缩烤饼，然后添加纤维素是否有意义？The joists are 2×8 so the batts could easily be compressed to tops of those joists, which I know would reduce the overall R value of that batt (despite an increase per inch), -but wouldn’t that compression deter some air flow, or is that too negligible to justify? Are there other/better alternatives?
是否有可能/合理地在batts上固定泡沫？可以将泡沫板向下固定到Josit上衣，从而压缩纤维板。但是，不需要巨大的泡沫，费用巨大吗？这似乎有点像在屋顶甲板上方做，除了没有甲板！如果这种布置是可行的，可以从上方贴上泡沫板接缝吗？或者，最好在当前天花板和重做Sheetrock下方的泡沫板更好吗？（由于天花板高度的损失，已经很低）（这不是一个很好的解决方案）。或者，我猜泡沫板可以在天花板上方，在托梁之间，在巴特以下的托梁之间，可以将其拉回并放回，然后将其放在一起。托梁的边缘可以用喷雾泡沫或优质胶带密封。
感谢您的所有建议。
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答复
霍华德，
有经验的阁楼绝缘承包商地址like yours all the time. The right way to do the work is to lift up the fiberglass batts (separating the batts from the kraft facing if necessary) and piling them up on one side of the attic. Then air sealing work is performed. Once all of the air sealing issues have been addressed, the batts can be returned to the joist bays (with or without the kraft facing).
Once that's done, it's time to install a layer of cellulose on top of the batts to complete the job.
If you can't find an insulation contractor who understands the necessary work, keep dialing the phone until you find one.
For more information on this topic, seeAir Sealing an Attic。
Martin:
感谢这个建议。拿起烤饼并不难，这是我的选择之一。我怀疑最好的练习将是在牛皮纸上的几英寸喷雾泡沫，使海湾很好地密封，然后将其盖住。我想避免由于费用而避免泡沫，尽管已经考虑了DIY项目的泡沫类型（以及获得专业估算）。用刚性泡沫的切割和鹅卵石方法是否是密封所有接缝的绝佳选择？我有一把泡沫枪，可以用一张好的胶带加倍。更多的工作，但费用减少。
I have nothing against contractors, but am a DIY'er of many years and would not have what I do if I had used contractors regularly. Here in my rural area there are not many real "specialists", -mostly generalists in order to stay in business. This is not to say there isn't expertise in areas like insulation, but with the internet, sites and blogs like this one, BSC, etc, I should be able to gain needed info and not have to use a contractor just so it is (hopefully) done right. I've made my share of mistakes over the years, but did not benefit from current levels of research and info pre internet. I'm also aware of mistakes greater and more eggregious made by contractors that I avoided.
So, thanks for sharing your expertise.
霍华德，
Air sealing work usually doesn't require filling every joist bay with spray foam. Nor does this work require a full layer of rigid foam installed by the cut-and-cobble method.
The best way to air seal the leaks is to focus on the actual cracks and holes. The approach is described in my article,Air Sealing an Attic。
This info would make the job easier. There is not too much that should be a problem, -the one ceiling light stands out. There are otherwise no ducts or other utilities. Not needing a continuous air sealing barrier above the sheetrock must mean that the taped sheetrock is a considerable air barrier in itself, is that correct?
霍华德，
你是对的;胶带的石膏板是空气屏障。当然，穿过干墙的穿透经常泄漏空气。此外，请注意隔板顶板和安装在隔板墙上的石膏板之间的裂缝；这些裂缝是导致大量空气泄漏的原因。