What if you need to insulate an existing unvented low-slope roof, say 3 ft. high at the high side, with very limited attic access? You could rip out the ceiling or tear off the roof, but there is a third method. Bill Hulstrunk is the technical manager at National Fiber, a manufacturer of cellulose insulation. "Our installers crawl in and do as much air-sealing as possible on the side with good access," Hulstrunk explains. "There is a point where the attic gets too confined and you can't do any air-sealing. So they'll dense-pack the side of the attic with limited access, and then they'll blow in loose-fill cellulose on the side of the attic where there was enough access for air-sealing work. It is always a good idea to have vents on the high-side walls, above the top of the insulation, to provide some connection between the air above the loose-fill insulation and the outside. If they've done a good job with the air-sealing, they've reduced the amount of moisture that will get up there. But in case there is some moisture that gets through, it's good to have some way to allow the moisture to make its way to the exterior."
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机译：如果您需要隔离现有的，未通风的低坡度屋顶，例如高处高3英尺，阁楼通道非常有限，该怎么办？您可以撕开天花板或撕下屋顶，但是还有第三种方法。 Bill Hulstrunk是纤维素绝缘材料制造商National Fiber的技术经理。 Hulstrunk解释说：“我们的安装人员会爬进去，并在易于接近的一侧进行尽可能多的空气密封。” “在某些情况下，阁楼太密闭，无法进行任何空气密封。因此，他们会在阁楼的侧面密集堆放，并限制出入，然后将松散填充的纤维素吹到阁楼一侧有足够的空间进行空气密封工作。最好在隔热层顶部上方的高侧壁上设置通风口，以便在松散的空气上方提供一些连接，填充绝缘材料和外部材料如果他们在空气密封方面做得很好，他们减少了将要吸收的水分，但是如果有水分通过，最好有一些允许水分进入外部的方式。”
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