确保摇滚浴舒适性绝缘是不辩护的屋顶组件的底部
We’ve just completed the exterior work of an unvented roof assembly and are moving on to installing the rafter bay insulation. The house is a 1923 bungalow with the typical 1 1/2 stories. There was an addition from the 80’s with a 2/12 shed roof. We are in zone 4a. Assembly from the outside in: three tab asphalt shingles with standing seam on the shed roof, synthetic underlayment, 1/2 in CDX plywood, 3 inches of XPS (sorry, didn’t understand problem with greenhouse gas potential at the time), another layer of synthetic underlayment, 3/4 inch mix of CDX and solid wood, 2 x6 rafters sistered to actual 7 1/4″, R30 Comfortbatt. The living spaces will be finished with drywall, the shed roof will be exposed ComfortBatt. Rafters are 24″ on center.
在试图在屋顶过程中试图在屋顶过程中难以接近棚屋的部分时，我们发现了ContryBatt绝缘并没有完全填充椽架，并且会从屋顶装饰的侧面留下最多1英寸的差距。结果，因为我们需要与工作的屋顶部分继续前进，所以从毛茸茸的深度减少到标称2×6的毛茸茸的条带，并用垂直于椽子捆扎搭扣以保持搭扣。这似乎已经降低了R30绝缘到R23，但甚至可能比材料太密集更糟糕。
The Rockwool installation instructions are a bit thin with unvented roof assemblies and, despite searching off and on for weeks, I have not found this question answered on GBA.
在确保椽子的同时支持BATT绝缘的正确方法是完全的，屋顶甲板和BATT绝缘顶部之间没有间隙？拜托，任何帮助都会非常感激。
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由气候和房屋部件组织的一千个建筑细节的集合
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保持毛茸茸的条带将有助于实现全部深度。我知道代码是明确的“与屋顶甲板直接接触”，但实际上，如果我们要相信乔，那么很少的物理来支持这一要求：
https://www.buildingscience.com/documents/insights/bsi-064-bobby-darin-thermal-performance.
假设气密腔，1“气隙不会显着改变性能。
But to answer your question, I've seen housewrap or roofing felt used to hold batts in place.
Thanks Jason, from reading the link it would seem at 7.25" there won't be much airflow at least due to stack effect in the rafter bay. I'm not sure the 1" gap is in an airtight space as the historical 1x material used in roof decking has maybe a 1/4" to 3/8" gap between boards. There is a synthetic underlayment applied under the 3" XPS and the XPS joints were taped so that assembly is airtight. The perimeter of the roof was replaced with 3/4" CDX and caulked with PU caulk so there shouldn't be any wind pushing air around. I'll restore the 1.75" furring strips and fluff up the R30 comfortbatt.
您可以使用“绝缘电线”来支持击球。这些只是切割的钢丝块比椽子之间的差距长一点。你将电线推入贝蒂的底部，它们会在两侧咬到椽子上以提供一些支持。这通常是你需要的，只是在安装过程中小心，电线不会弹出并戳你。穿安全眼镜！
我已经看到薄玻璃支撑有薄胶层，也在椽子之间压制。你所需要的只是一个春天的力量，可以一起举起东西。如果你真的想全力以赴，你可以在椽子的两侧钉起来一些1x2（或胶合板），并使用那些支持将支持斯巴特的板条。
您可以购买比正常悬架线更硬的预剪切绝缘线，这是我将使用的。您还可以将自己的电线从像9号钢支撑线（常用用于降底栅格支架）的东西中剪掉自己的电线（常用于落地栅格支架，这就是为什么它被称为“悬架”线）。
账单
嗨比尔，我看到了绝缘支撑线，并没有印象深刻，但你的认可让我重新考虑。我可以点开几个不同的长度来支持老房子椽子的不同宽度。
理查德，
The crew installing my batt insulation used wire spikes that pushed through the batts. A push on metal washer/cap went on each wire to hold the batts up. Each wire has a small metal base onto which they put a dab of construction adhesive to hold it to the decking. The wires were put in place a day before the other crew members set the batts.
我不太相信电线和胶水是ld hold over time, so I stapled leftover banding from bundles of materials across the batts at 24" intervals. These were just fiberglass batts, which I think are quite a bit lighter than Comfortbatts, so I would guess that extra support might be a good idea.
I also used the wires that span between joists or rafters and found the biggest annoyance being the tendency for them to "flop" bow side down. I had to go back and set a number of them to make sure the bow went up and pushed on the batts. Do keep some heavy duty clippers or sidecutting pliers on hand when set the wires on less than standard width. Too much bow makes them even more twitchy.
An electric stapler will allow you to place the plastic banding from bundles of whatever pretty quickly. If new material is the only choice, the webbing used for lawn chairs would be cheap and provide lots of support.
嗨Roger，我想我将使用捆扎和电线支撑的组合。我在开始项目之前订购了2000英尺卷（最小可用）盒捆扎材料。电动订书机将让我在一个狭窄的空间中驾驶1/2“钉书针。我担心捆扎的长期生存，但在考虑更长的长度时感觉更好。也许弹簧线的组合来推动绝缘层在需要和更广泛的支持的情况下，将工作。
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