答复

1. GBA Editor
   马丁·霍拉迪（Martin Holladay）|Oct 19, 2018 03:53pm|#1

   Mill,
   如果您谈论的是膝盖墙后面的三角阁楼，最好将三角阁楼包括在房屋的条件空间中。这意味着您不想在膝盖或阁楼地板上进行绝缘。取而代之的是，绝缘层应遵循倾斜的车顶线。

   For more information, see“隔离阁楼膝盖的两种方法。”

   如果您忽略我的建议，并在三角阁楼的地板上安装绝缘材料，则可以像任何阁楼地板一样隔热。您不需要地板绝缘下的聚乙烯或膜 - 只需注意气密（尤其是气势连续性），这将需要在所有地板托梁之间阻塞）。

2. 
   Mill_house|2018年10月21日上午11:36|#2

   谢谢。After assessing my house, my budget and after reading and asking questions, I will be going with the traditional approach as outlined in the article you link to ie) I will be insulating the kneewall and the attic floor behind the kneewall.
   Two questions:
   1. There's a few pieces of duct work in the kneewall stud bays that heat/cool the upstairs. Because I will be installing 3" of EPS rigid foam on the attic side of the kneewall that will come into contact with the ducts, how should I prepare the ducts prior to mounting the foam? ie) i'm asking about shielding the foam from the hot/cold of the duct.
   2. Your recommendation of not installing a vapour retarder on the ceiling of main floor when it's demo'd - which in turn is the attic area on the second floor behind the kneewall - is not the answer I was expecting. Just to clarify, the walls on my main floor will have mineral wool batts in the stud bays, Membrain and drywall...but the ceiling won't have a vapour retarder, per your advice. (The ceiling will just be drywall and mineral wool batts.) Why smart vapour on walls but not on ceiling?

3. GBA Editor
   马丁·霍拉迪（Martin Holladay）|2018年10月22日上午06:30|#3

   Mill,
   You're making the wrong decision, especially if you have HVAC ducts in the attic. Whenever there are HVAC ducts in the attic, the right decision is to locate the insulation along the sloped roofline, so that the ducts are brought inside the home's conditioned space.

   在美国，当天花板绝缘材料上方具有通风阁楼时，在天花板绝缘层内部没有蒸气屏障或蒸气阻滞剂的代码要求。不用说，如果您的工作将由加拿大法规官员检查，您需要验证加拿大法规官员是否会批准您的详细信息。从建筑科学的角度来看，您不需要天花板下的内部蒸气延迟器，而只需注意气密。膜是不必要的，但无害。

4. 
   Mill_house|2018年10月22日下午01:32|#4

   这不是HVAC管道。这是一个连接到地下室炉子的锡管。它坐在膝盖阁楼侧的螺柱上，只有3英寸深，大约1英尺。我只有两个。否则，膝盖墙后面的阁楼部分没有任何东西。只是想知道在将泡沫对付他们之前，该如何对付他们。

   谢谢

5. Expert Member
   彼得·恩格尔|Oct 22, 2018 02:50pm|#5

   Since there's only two of them and they're small, you can probably insulate them individually. First, make sure they are well air-sealed at all seams and at the penetrations through the wall and attic floor. stuff your fluffy insulation around them to fill the wall cavity, then use a layer of 3" foam behind the ducts to isolate them from the attic. Since EPS is cheap, you might want to use two layers, extending out 6"-12" beyond the ducts to reduce edge-effects in the insulation.

   If you are insulating the stud cavities of the kneewalls with fluffy insulation, you also need to install a vapor permeable membrane or rigid air barrier layer on the back side to keep the cold air out of the fluffy insulation. The air barrier can go in front of or behind the EPS you're using to insulate your ducts.

   这种方法应该在加拿大大草原上使用，空调季节短（或不存在）。它在炎热/潮湿的气候中无法使用，因为您仍然会在冷却模式下在管道上获得凝结。

6. GBA Editor
   马丁·霍拉迪（Martin Holladay）|Oct 23, 2018 05:32am|#6

   Mill,
   您写道：“这不是HVAC管道。这是与地下室炉子相连的锡管。”

   That sounds like an HVAC duct to me -- either a supply duct or a return duct that is part of your space heating system.

   "HVAC" refers to any duct connected to a forced-air heating system or a forced-air cooling system. It also refers to ducts used for mechanical ventilation.

7. 
   Mill_house|Oct 26, 2018 07:49am|#7

   抱歉，是我的错。我的意思是说这不是阁楼中的HVAC系统。只有两个锡管厚约3英寸（最大），高约1英尺。他们俩都在膝盖螺柱舱中。否则，科德角的阁楼区域中没有什么。只是担心将EPS刚性板直接反对。

8. Expert Member
   彼得·恩格尔|2018年10月26日上午07:57|#8

   There is no problem putting EPS directly against the ducts. They don't get hot enough for any issues. Just make sure the ducts are airtight at seams and building penetrations before covering them up.