答复

1. GBA Editor
   马丁·霍拉迪（Martin Holladay）|2012年4月11日上午05:55|#1

   Kristina,
   As long as the building is heated in winter, the drywall will be close to room temperature, and will therefore be warm and dry -- just as the plaster used to be.

2. 
   克里斯蒂娜·贝德尔（Kristina Beedle）|Apr 11, 2012 07:33am|#2

   是的，建筑物将在冬季加热。我认为干墙的温度以及将传递给砖的热量与石膏的温度大致相同。

3. Expert Member
   Michael Maines|2012年4月11日下午11:00|＃3

   克里斯蒂娜（Kristina），如果您绘制墙壁的缩放范围，则可以帮助您的检查员了解墙壁上发生的事情，如下所示。在外侧，画一条表示室外温度的水平线。高出它几英寸，在墙壁的内侧画一条水平线，代表70°或任何您喜欢的东西。通过连接水平线的墙壁画一条线。这是墙壁内的近似温度梯度，并清楚地表明，只要内部加热，干墙就会变暖。

   
4. 
   Trevor Trainor|2012年4月11日下午09:22|＃4

   Kristina,

   I think your inspector has a point. The issue is not the temperature of the drywall, but the temperature of the interior surface of the brick wall and the ability of vapour and interior air to reach it and condense within the wall assembly. What are the air and vapour control layers? When you apply the drywall to the furring strips, will this create an air gap? The change you are proposing could result in a significant change in the vapour and thermal profile of the wall and present condensation risk.

   我不会这么快地排除绝缘选项。如果与外部水控制措施合作正确地完成，则可以在不增加冻结/融化风险的情况下添加内部绝缘材料，并在此过程中创建更节能的房屋。约翰·斯特劳伯（John Straube）博士可以比我更好地解释这一点 - 查看有关该主题的论文 -

   http://www.buildingscience.com/documents/digests/bsd-14-interior-unsulation-sunsulation-Retrofits-of-load-load-boarning-masonry-walls-in-cold-climates/

   Trevor

5. 
   克里斯蒂娜·贝德尔（Kristina Beedle）|Apr 11, 2012 09:31pm|＃5

   I have actually been in contact with the Building Science corp, and because of the type of brick and the evidence of freeze thaw cycles in our paraphets we will not be insulating the walls. I have had several engineers and an architect advise against the insulation for our walls. All of the exterior items on the home have been addressed. Yes there will be an air gap and yes our plan is to attach the drywall right to the furring strips. They are very secure and have withstood the last 120 years. We will not be adding a vapor barrier as this would cause condensation between it and the brick, and we need the brick to breathe. We are proposing some sort of a ventilation system to help control the moisture, but I just don't see how drywall would allow or add any more moisture than the lath & plaster did...as there was an sir gap with the lath & plaster too.

6. GBA Editor
   马丁·霍拉迪（Martin Holladay）|2012年4月12日上午05:26|＃6

   特雷弗，
   You have it backwards.

   You wrote, "The change you are proposing could result in a significant change in the vapour and thermal profile of the wall and present condensation risk."

   实际上，如果没有隔热材料，则砖块将变暖，烘干机，如果安装了隔热材料。

7. 
   Trevor Trainor|2012年4月12日09:22 AM|＃7

   Sorry to be unclear. My point was that by removing the stucco and replacing it with drywall, you will be changing the vapour and thermal profile of the wall. If there was an air gap previously, then the change in the thermal profile will be minimum, but the vapour permiability of drywall is approximately 5 times higher than stucco, changing the vapour profile significantly. The other issue to consider is the moisture tolerance of drywall compared to stucco. Condensation moisture touching the stucco in the old wall system would not cause damage, while it only takes a small amount of moisture to cause problems with drywall.

   You just want to make sure that you do a really good job of controlling air and vapour flow from the inside in this low R wall system.

8. Expert Member
   Michael Maines|2012年4月12日上午09:34|＃8

   The original plaster likely had many coats of relatively impermeable oil-based and/or lead paint. The new drywall (installed over existing furring strips, according to Kristina) will likely be covered with permeable latex paint.

9. GBA Editor
   马丁·霍拉迪（Martin Holladay）|2012年4月12日09:41 AM|＃9

   迈克尔和特雷弗，
   While you are right that the vapor permeance of the drywall may differ from that of the painted plaster, (1) it's an easy matter to apply a coat of vapor-retarder paint to the drywall, and (2) my original point -- that the drywall will stay warm and dry all winter as long as the building is heated -- remains true.

10. 
    克里斯蒂娜·贝德尔（Kristina Beedle）|2012年4月13日上午08:35|＃10

    感谢大家。感谢您的意见。