答复

1. 
   David Meiland|2012年8月16日下午10:35|＃1

   We pour it on like that here in 4 marine and I think R-60+ in the attic is the right thing to do. Once you are set up and blowing, the extra stuff is very cheap and will pay dividends as long as the building is there. We have gotten a surprising amount of positive feedback from clients who we've done this for, folks who were previously not really tuned into insulation and air-sealing as important steps. They like the comfort and stable temperatures.

2. 
   兰迪·勒索姆|2012年8月16日晚上11:36|＃2

   Thank You Armando for your comments. I think you are exactly right and I might even add to the "doing things on the cheap" list - poor performing windows. The challenge is how does the humble insulation (or even general) contractor help these people in a cost effective manner.

3. Expert Member
   Armando Cobo|2012年8月16日晚上11:40|＃3

   我认为这是简短的答案：达拉斯的热/寒冷房间问题，而其他任何地方都是廉价方面做事的结合。泄漏的建筑信封，不良的绝缘选择和安装，设计错误，超大，安装不良的HVAC设备，泄漏的管道，弯曲导管，通风式阁楼中的设备，无返回管道，没有调试设备。除此之外，我与之交谈的HVAC承包商必须不知道正确或想正确地做到这一点。
   这是我的起点，如果您每1,000-1-1,200平方英尺安装超过1吨的冷却，则在建筑物信封（产品和材料规格和安装）或HVAC系统中设计或安装错误的系统中，您的设置错误。安装巨大的耗时数量，同时拥有糟糕的信封和HVAC系统正在将口红放在猪上，并浪费了钱。
   Aren’t you glad I gave you the short answer?

4. Expert Member
   Armando Cobo|2012年8月16日晚上11:58|＃4

   兰迪，
   这一切都始于教育，想做正确的事情。我知道很多好的承包商，但是行业中的大多数人都拒绝做正确的事情，因为增加了工作成本。我们研究了所有这些都由平方英尺定价的理论，并且我们基于这一点而不是我们的工作是“竞争”。该系统将改变，承包商将通过构建代码升级和执法或使承包商对客户的能源账单和家庭绩效负责来做得更好；后来不会发生。

5. GBA Editor
   马丁·霍拉迪（Martin Holladay）|2012年8月17日上午5:14|＃5

   兰迪，
   要添加的另一点是：在所有可用的绝缘类型中，松散的玻璃纤维最不可能按预期执行，因为它是如此蓬松且可渗透。通常，您必须安装价值“ R-60”的玻璃纤维，以使其与R-40纤维素一样。

6. 
   David Meiland|Aug 17, 2012 10:10am|＃6

   So Armando, how much attic insulation do you think is correct? You are correct that HVAC equipment is often a big problem, but you also mention envelope and insulation problems. It sounds to me like he is improving envelope and insulation with what he is doing. What are you recommending, assuming he can't get the customer to buy a complete HVAC rebuild?

7. Expert Member
   达娜·多塞特（Dana Dorsett）|2012年8月17日下午4:12|＃7

   扩展马丁关于低密度玻璃纤维的评论：

   玻璃纤维在某种程度上是对红外辐射的半透明，在热屋顶甲板下，玻璃纤维中的空气在几英寸的位置将比阁楼空气高几位。（德克萨斯州A＆M的一些人在1980年代将其研究为死亡。）这意味着您要对更高的温度（玻璃纤维几英寸的温度）进行绝缘（玻璃纤维的较低（玻璃纤维的厚度），从最热的层降低了玻璃纤维的厚度）

   Then during the heating season the high air permeability of fiberglass causes it to give up some performance to convection currents within the fiberglass- the warmed air at the ceiling bubbles up to the top, to be displaced by cooler denser air from above.

   纤维素比玻璃纤维少得多，并且不透明红色红色。在热屋顶甲板下，纤维素的表面是纤维层中最热的点，尽管阁楼空气从上面有辐射通量，但阁楼空气将其冷却至几个度。最终结果是在一年多的整个温度范围内的稳定器R值和性能。

8. 
   Robert Hronek|2012年8月17日下午08:57|＃8

   Dana

   我同意你的看法。由于玻璃纤维是任何隔热材料中最多孔的，因此我只是没有在阁楼中使用。我认为夏季或冬季，您的空气通过降解其绝缘价值。然后，我喜欢您将其“半透明”放到辐射热的方式。因此，它在夏天有2次罢工。

   我已经阅读了很长时间，以至于为了使玻璃纤维以其陈述的r值执行，需要在6边的空气紧密围栏中进行，但是在阁楼中，我们将其开放到顶部，然后我们有屋顶通风孔。添加电动屋顶通风口，甚至更糟。

9. Expert Member
   Armando Cobo|2012年8月17日下午09:53|＃9

   大卫，
   Design retrofits are a different animal, but I always recommend starting with an Energy Analysis. It gives me a chance to educate the homeowner on how to do the job right. Sealing the building envelope and encapsulating the HVAC system, in a ventilated attic, is a priority; and it maybe easier, and cost less, to condition the attic.
   对我来说，如果客户不愿意或无法正确完成工作，我将不会从事新房或改建设计工作。这始终是灾难的秘诀，也不适合我的商业模式。

10. 
    JoeW N GA Zone 3A|2012年8月18日上午11:47|＃10

    @ David, Armando

    像兰迪一样，我是第3区...但是（湿度）很大。我正在升级的房子在阁楼上吹了FG。我认为将其全部抛光，用几英寸的喷雾泡沫闪烁尽可能多地密封天花板，然后在顶部堆放。

    Both guys recommend I pile the fg back on; one explained that the humidity might cause some issues for the cellulose, and it's more expensive/inch here. Assuming the budget remains the same and the target is high effective R-value, would you prefer on top of spray foam --

    更多玻璃纤维
    或者
    纤维素较少

    我想保留通风的阁楼。提前致谢。

11. 
    迈克尔·钱德勒|2012年8月18日下午12:04|＃11

    Armando is spot on. I consulted on one house in Fort Worth TX that was Energy Star certified and has gotten acceptable blower door numbers (it was a very large volume house so E-star acceptable blower door at 6 ACH-50 was pretty easy to achieve) but significantly there had never been a duct blaster test done. The owners complaint was about excessive dust in the home, they weren't complaining about comfort or cost. They had analyzed the dust and it was cellulose.

    建造者最终进行了弹簧进行鼓风机测试，而爬网空间中的返回空气导管正在通过基础通风孔拉动割草机剪接，并将其分配在家具上。显然，这也使热交换器装满了潮湿和发霉的割草机，从而影响了HVAC系统的室内空气质量，能源成本以及舒适性 /湿度性能。

    Adding more insulation to the attic would not have been part of the solution. It's important to start with an audit that includes both a blower door test and a duct blaster test. Many energy audits don't include a duct blaster test as it involves sealing off all the ducts and can be time consuming to perform. Calculating duct leakage from a blower door test is no substitute.

12. Expert Member
    Armando Cobo|2012年8月18日下午08:10|＃12

    JoeW,
    Cellulose is hygroscopic, but I do not know of high humidity affecting its performance; other than rain/leak wetting. Assuming you do not have the HVAC system in the attic, I do like vacuuming all existing insulation, installing the 2” CC foam and then pack the rest of cellulose to meet R38 or more.
    您可以尝试用生态着密封，然后堆积纤维素。那也许便宜。
    Perhaps Allison, Carl, Michael or John Tooley know more about that issue in your neck of the woods.

13. 
    迈克尔·钱德勒|2012年8月20日12:21 AM|＃13

    我更喜欢将FG拉开，用CAN泡沫密封穿透性和顶部板，盒子任何非IC罐头灯光，然后在我走时将FG放回原处，并用六到十英寸的纤维素覆盖。纤维素可以拾取湿度并很快脱落，并有助于抵抗玻璃纤维问题的风洗。