答复

1. Expert Member
   Dana Dorsett|2017年10月16日下午12:22|#1

   在螺柱之间使用昂贵的高R/英寸泡沫是浪费良好的泡沫。看：//m.etiketa4.com/articles/dept/musings/installing-closed-cell-spray-spray-foam-foam-bet-------------------

   What's worse, XPS loses performance over a few decades as it's climate damaging HFC blowing agents leak out, eventually falling to under R4.3/inch ( R15 @ 3.5").

   From a price/performance point of view you're better off caulking the wallboard to the framing with polyurethane caulk (not the cheap stuff) and installing well fitted 3.5" ( R15) rock wool in that partition wall, and NO vapor barriers, and either standard or exterior grade drywall on the garage side, painted with a standard interior latex paint.

   The high vapor permeance of the drywall prevents moisture accumulation inside the studwall, since can dry easily into the wall. If that's not good enough for the local code inspectors, paint the interior side drywall with "vapor barrier latex" before insulating the cavity to bring it within the NBC code definition for "vapour barrier".

   摇滚羊毛具有完全防火的额外好处，而聚苯乙烯（XPS）在车库火灾的情况下会融化并燃烧。

2. GBA Editor
   马丁·霍拉迪（Martin Holladay）|2017年10月16日下午1:23|#2

   Vernon,
   Dana Dorsett referred to your "interior side drywall," but the way I read your question, there is no interior side drywall. It sounds like you covered the wall with laminate.

   另一条评论：达娜（Dana）建议“车库一侧的标准或外观干墙”。请注意，大多数建筑代码要求此干墙厚5/8英寸（因为这是车库）。

3. Expert Member
   Dana Dorsett|2017年10月16日下午1:33|#3

   “我不想拆除的客厅一侧的干墙，因为我用壁炉安装了层压板。”

   Reads to me like the laminate was installed over the drywall, not replaced by laminate.

4. GBA Editor
   马丁·霍拉迪（Martin Holladay）|Oct 16, 2017 01:39pm|#4

   达娜，
   我向弗农（Vernon）读了您的建议 - “涂上内侧的干墙” - 是指“将面向起居空间的石膏板画”。对我来说这似乎是不可能的。

   But perhaps you were advising Vernon to paint the back side of the drywall -- the side of the drywall facing the stud bays.

5. 
   Acfrqflyer|2017年10月16日下午2:25|#5

   Dana and MARTIN, update: the living room wall is fully drywalled with laminate installed on top of the drywall in the middle of the wall . The wall is approx 16 ‘ long. The laminate takes up approximately 8’ . So to understand what your telling me, I paint the garage side drywall (back side of living room drywall) with a vapour barrier paint. Then caulk were the studs meet the drywall in each cavity with polyurethane caulk. Then install rock wool batts in each cavity, then install drywall over that. Then paint wall with latex paint. Also, what brand is considered a good polyurethane caulk? Dap?

6. Expert Member
   Dana Dorsett|Oct 16, 2017 03:39pm|#6

   我确实在建议在绝缘之前对内侧干墙的腔侧面的腔，但前提是检查员坚持。

   在任何绘画之前，将干墙填入框架上可能会最好地完成 - 油漆可能不会像填缝一样牢固，并且希望它能保持一个世纪或更长时间。值得一提的是填补所有加倍框架的接缝，例如顶部板，千斤顶螺柱等。也密封了所有电气和管道穿透。多伦多处于气候区域5/6边界，外部护套是高度渗透的墙板，在车库中的空气慷慨地排气，而真实的外部壁板暴露在天气中很长一段路，它将有资格，因为“排气在IRC处方中覆盖石膏的覆层，该规定将允许III类蒸气延迟器进入组件的内部：

   https://up.codes/viewer/wyoming/int_residential_code_2015/chapter/7/wall-covering#R702.7.1

   Siding with a 6mm rainscreen would also qualify, if using an exterior grade gypsum board, but you have a whole garage between the gypsum board and the true exterior. (That's one HUGE rainscreen! :-) )

   Any general purpose polyurethane caulk should be good enough, just avoid specialty types that are thinner, such as "self leveling" caulk designed for sealing cracks in concrete. Just avoid cheaper stuff such as painter's caulk, which is less likely to survive the test of time.

7. 
   里德·鲍德温（Reid Baldwin）|2017年10月16日下午4:08|#7

   Vernon,

   I am surprised nobody asked what you were attempting to accomplish by removing the garage-side drywall and the existing insulation. Was there a problem with them? If your objective was to significantly improve the R-value of this wall, then the advice might be different.

   BTW, While your wall is open, you should put in the wiring for an electric car charger.

8. 
   Acfrqflyer|Oct 16, 2017 04:33pm|#8

   Hi Reid, thanks for answering. I installed an electric fireplace on the opposite side of the wall. There was no electrical for it. So I needed to run a wire. Also, the wall was very cold to begin with so I wanted to air seal and insulate always. The only thing now, I can’t remove the drywall in the living room because I don’t want to remove the fireplace and laminate feature wall I installed on top of the drywall. What’ is your thoughts?

9. 
   里德·鲍德温（Reid Baldwin）|2017年10月16日下午5:51|#9

   我相信达娜（Dana）关于如何改善空气密封的建议。空气密封车库/房屋墙尤其重要，因为室内空气质量的问题。如果以前的空气密封相对较差，那将解释墙壁很冷。围绕旧绝缘材料流动的空气可能导致墙壁不执行其名义R值。除非房屋中的其他墙壁具有较高的R值，否则没有理由认为这堵墙的R值需要改善超出Dana的建议。

10. GBA Editor
    马丁·霍拉迪（Martin Holladay）|2017年10月17日上午08:15|#10

    Vernon,
    我同意您到目前为止听到的建议。空气密封工作至关重要。如果您想改善墙壁的R值，那么您就有一个很好的机会 - 但您不必这样做。

    一种选择是在安装5/8英寸干墙层之前，在螺柱的车库侧安装一层刚性泡沫。多伦多位于气候区域5或6中 - 因此，对于5区的2x4壁，外部刚性泡沫的最小R值可能低至R-5，或者在6区的2x6壁上高达R-11.25。不过，我认为您不必太担心这些最低限度，因为您的车库不会像外部空气那样冷。有关更多信息，请参阅Calculating the Minimum Thickness of Rigid Foam Sheathing.