隔离现有墙壁的有效选择是什么？
If this question has been answered please point the link – I am unable to find past material.
房屋已有50多年的历史了。墙壁横截面是：砖贴面，腔，celotex型材料，框架和石膏，内部板上。Celetex和石膏之间的壁腔中没有其他绝缘材料。
The blown in insulation folks say they are the best option. The injection foam folks say they are the best in R value and performance – that the blown in settles over time and that it does not control air movement enough. Of course the foam is more expensive.
What is the right strategy?
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答复
The effectiveness of the cavity behind the brick is going to be a big determiner of whether an insulation project will work, or just cause eventual moisture problems.
I have only seen a couple of injection foam installations, but have not been impressed. It appears easy to miss spots and leave gaps and voids in the wall. Then there are the possible chemical issues. You don't get much if any added R value over dense pack cellulose, so I wouldn't go with the foam.
The blown-in folks you're talking to... are they long-established companies that have done hundreds of homes like yours in your area? That's who I would go with.
I would select dense packed cellulose over the injection foam any day. As you already mentioned, foam is more expensive, and I think it is safe to say a less reliable product. I have inspected many homes that have had their walls insulated by cellulose or the injection foam. It does seam that the foam guys miss wall cavities more often, but mostly the product degrades over time. I have some Infrared images where it looks like the walls are on fire from the inconsistencies of the application. Even had a customer send me a photo where they cut into their wall and the foam shrunk about 25% and was floating in the middle of the wall cavity.
Now cellulose is the staple of the majority of Home Weatherization Programs throughout the country. And yes it can settle if it is not installed properly. But as David mentioned, if you select a contractor that has been doing it for awhile, settling will not be an issue. And it will help control air flow. My 1500sf ranch saw a 400cfm reduction from dense packing the walls alone.
马塔伊，
您没有描述框架腔，但我假设您的房子的螺柱深3.5英寸或4英寸。如果是这样，请搭配纤维素。
The degree to which (or even whether) cellulose settles is entirely a function of it's installed density ad how much seasonal moisture cycling there is. Behind a moisture-reservoir cladding such as brick it will require somewhat higher density than behind back-vented clapboards, etc. In a cold climate zone it would also be wise to install variable-permeance vapor retarder (eg. Certainteed MemBrain) to limit wintertime moisture accumulation as well. For most installation 3.5lbs per cubic foot density is "good enough" and in warmer, less humid parts of the US even 3.0lbs density would be fine forever. But just depends.
当构架框架的热桥接时，低曝光注入泡沫的额外的R/英寸仅对整个壁r产生微小的影响，并且不值得额外支付。它比3磅的纤维素更适度。
这种类型的泡沫也不是很蒸发的蒸气，也不能以闭孔聚氨酯的方式保护冬季水分驱动器免受冬季水分驱动器的影响。在没有蒸气延迟器的组件中，纤维素的水分缓冲能力比高透明的泡沫更好地保护结构木材免受冬季水分驱动器的影响。