LVL平坦的空气/蒸气屏障
Finally framing! We are confronting the confounded floor sill/rim detail at intermediate floor connection in terms of air sealing. Our original detail had called for Mento to cover the entire Rim joist, but our framer was concerne, with floor hosts on hangers over Mento. Our builder was concerned about the hundreds of nail holes. So we decided to install TJIs and air seal around them. My question is whether the face of an LVL rim is sufficient for air and vapor sealing, or whether a vapor barrier should be applied to the inside face of the LVL. Otherwise we could just seal the top plate of the first floor wall and the bottom plate of the second floor wall and call it a day. Is there a reason that the air stealing should be continuous over an LVL Rim joist?
GBA细节库
由气候和房屋部分组织的一千个建筑细节的集合
Replies
伊桑,
Your questions are a little confusing. One of your questions concerns "whether a vapor barrier should be applied to the inside face of the LVL." That one's easy: there is no requirement for an interior vapor barrier in Zone 5 -- merely a requirement (for most but not all walls) for an interior vapor retarder, which is a less stringent layer than a vapor barrier. As far as I know, the requirement for an interior vapor retarder does not apply to rim joists.
也就是说，知道如何绝缘LVL轮辋托梁将很有帮助。它会在外部隔热吗？在内部？您将使用哪种类型的绝缘材料？
空气从绝缘密封是一个单独的问题d vapor retarder questions. Of course your air barrier needs to be continuous -- so the seam where the bottom of the LVL meets the top plate, and the seam where the top of the LVL meets the subfloor above, needs to be sealed against air leakage.
Martin, I am sorry for the unclear nature of my question... I was excited about the new ease of use of GBA on mobile, so I posted from a jobsite using my phone. I think that lead to unclear question...
1.我可以令人震惊的是编辑我的问题。但是我的意思是指空气屏障而不是蒸气屏障...我们将在我们的2x6框架内使用Intello Smart Air/蒸气屏障。
2. The LVL Rim joist will be insulated on the exterior with 6" rockwool and 2"+ Rockwool on interior.
3. As you can see in the picture, we are planning to tape (or calk in some locations) the top plate/LVL connection. We can then use caulk at top of plate between plate and 2nd floor decking.
4.我不知道LVL是否需要内部面上的空气屏障（在每个托梁之间安装并在托梁接缝之间进行胶带胶带……或LVL本身起作用的空气屏障？我知道该区域托梁湾经常充满喷雾泡沫，但我们不使用喷雾泡沫...
伊桑,
I think part of the confusion comes from the location of the rim joist. It looks for the photo as though it is flush with the interior face of the top plates. So the I-joists will be supported by hangers? Whats on the exterior of the LVL? Where is the air-barrier located? At the interior of the wall or the sheathing?
伊桑,
Malcolm's questions are good ones.
But to answer your question:
问：“ LVL是否需要内部面上的空气屏障（在每座托梁之间安装并在托梁接缝之间进行胶带），或者LVL本身是空气屏障？”
A. The LVL is an air barrier. Just make sure that your air barrier is continuous. If you tape the LVL to the top plate of your wall, that means that your top plate becomes part of your air barrier -- so any interruptions in the top plate need to be sealed. Moreover, if your exterior sheathing is part of your air barrier, then any seams between the top plate and the exterior sheathing need to be sealed as well.
Malcolm and Martin
我的边缘托梁设置为2x6框架的内部，以给2英寸的岩石圈带2英寸（请参阅附件）。是的，我的托梁将得到衣架的支撑。我认为承包商现在计划将所有我周围的录音机胶带胶带。托梁（阻止Web创建一个方形表面）。这可能是过分的，但看不到它会受到伤害。
马丁，我不明白您的意思是“此外，如果您的外部护套是您的空气屏障的一部分，那么顶板和外部护套之间的任何接缝也需要密封”。
Exterior sheathing will be plywood, but is not intended as air barrier. Exterior sheathing will have Mento and taped/flashed window surrounds acting as a WRB.
伊桑,
并非所有的建筑商都在护套层中创建一个空气屏障，如果您决定不这样做，那还可以。但是，您需要知道您的空气屏障在哪里，如果您想有任何希望连续的希望。
If you are using a housewrap (Solitex Ment0) as your exterior air barrier, that will work. Just make sure that the perimeter of the Solitex Mento has an airtight connection to your ceiling air barrier and your foundation air barrier. Transitions are the tricky areas.
如果您总是打算将Solitex Mento（房屋包）用作您的空气屏障，并且如果房屋包装从一层到另一层连续，我不确定为什么LVL是否是空中屏障的问题第一位。
Martin
My drawing shows the intello to be continuous from one floor to the next but that was wishful design thinking, and the carpenters cancelled that plan. The ultimate solution was to tape around each I joist after blocking out the webs. No if it is true that the LVL is an air barrier than it seems that we would only have to tape the air barrier to the bottom the LVL and then again to the top of the LVL making sure that the sills are sealed and part of the air barrier.
伊桑,
我的设计中也有一个内部空气屏障，我们围绕着您遇到的轮辋托梁问题，从螺柱墙的顶部以及顶板上方和顶板上放置了2英寸宽的膜。那留下了大约16英寸宽的膜，悬挂在外面。一旦上面的地板被框起来，我们将一块膜包裹在轮辋上，并将其钉在地板上，然后再在墙壁上工作。然后将该膜粘贴到墙壁上的膜上，以形成连续的空气屏障。
乔恩
Thanks for your reply. But if Martin is correct, maybe this wrapping you suggest is unnecessary because the rim joist itself (double LVL) is an air barrier itself so air barrier?
伊桑
伊桑
伊桑,
我以为您有一个外部空气屏障（使用房屋包）。
乔恩athan had an interior air barrier.
Which approach are we talking about?
我有一个内部空气屏障（Intello）。我有一个外部WRB（Mento）。
伊桑,
It is not the rim board in my case, or in your case the LVL that is the issue, it is the connections between the rim board/LVL and the plates.
您为什么不能将Mento用作空气屏障？
Here is a picture to show what we did. I had Siga sign off on this detail before proceeding.
Thanks, Jon. As you can see from the photo I posted above, in which we taped the top plate to the LVL, I think we have the air control layer under control, assuming the LVL and 5.5" of plywood on the flat count as part of a continuous air barrier. I'm concerned that the Intello won't be continuous so our smart vapor control will have a gap at the rim. To be honest I don't know if this is a problem.
Martin... after reading back through your responses, I started asking myself... why not make the sheathing/SolitexMento my primary air barrier? I think I had it in my mind that my interior vapor retarder COULD also be the air barrier, so it SHOULD be... but our building form is very simple and at this point I am not clear why I couldn't make the exterior sheathing+Mento my primary air barrier, with the Intello on the interior acting as a secondary air barrier. I basically have a rectangle with a shed roof and flange windows, so this could be the primary air barrier as long as it is OK to tape it to the underside of the roof sheathing and then have the air barrier shift to the top of the roof sheathing (I don't imagine we would have to wrap the eave...
伊桑,
实际上，大多数高性能的房屋在外护套上建立了主要的空气屏障。如何使从墙壁屏障到天花板的空气屏障的过渡取决于天花板的绝缘层的位置。
Martin, I'm assuming by your use of the word "primary", that there can be a "secondary" air barrier at the interior wall that serves more as a vapor control layer keeping vapor out of dense pack cellulose.
（天花板绝缘是大教堂tji tji tji的密集包装纤维素。）
伊桑,
Don't confuse air barriers with vapor retarders.
我会改写您的问题：“墙壁可以同时拥有主要的和次要的空气屏障吗？”答案是肯定的。有关此问题的更多信息，请参阅“一两个空气障碍？”
如果您需要在墙壁的内侧控制蒸气，则该层将被称为蒸气延迟器，而不是空气屏障。有些材料既可以充当空气屏障，也可以充当蒸气阻滞剂，但大多数材料都不能充当。例如，蒸气延迟涂料或面部面孔通常用作蒸气阻滞剂，但不是空气屏障。