More Energy-Smart Details
水管理是建筑行业的重中之重。水经常被命名为建筑物的第一名，水需要我们的注意。如果不是水，设计和建造建筑物将相对容易。但是我们的墙壁有窗户，这意味着连续性中断，并有机会通过组装运动。我们在墙壁上切下孔，将窗户插入孔中，然后留下来重新创建原始连续性水平。
One of the most important aspects of a window installation is managing water at the rough sill. Our water management strategy is twofold. First, stop water from migrating to the interior face of the exterior wall. Second, address any accumulated moisture. While there are many ways to accomplish both, we typically use the following four options.
Option 1: Flanged window inside a rough opening with a back dam.The sill membrane flashing is installed on the outside face of the rough sill, across the top of the rough sill, and up and over the back dam. The benefit of this detail is that the back dam provides a vertical surface to stop interior migration of moisture; and the membrane flashing keeps the moisture from being absorbed into the wall framing. The downside of this detail is that it doesn’t promote drainage of moisture to the exterior. One solution is to install the rough sill at a slight angle to the exterior to direct moisture outward.
选项2：倾斜后水坝。像选项1一样，倾斜的后水坝可防止向内的水分迁移。好处是，它为外部提供积极的倾斜排水，以摆脱进入粗糙开口的任何水。这也是一种具有成本效益的方法，非常易于安装。一个轻微但值得注意的缺点是需要反向斜坡…
6 Comments
OMG... Nice details, but I see you're taking a risk of not getting invited to the Thanksgiving table for using FLANGED WINDOWS! Maybe there is hope to teach the Old Dog some new tricks...
The parts of the world that are subject to intense rainfall include quite a few that have recently had significantly more intense rainfall than they did in the past. Given the uncertainty about what other changes there might be, it seems wise to build in resilience regardless of where you are.
关于选项4，我想知道窗户制造商是否应该开始将制造的闪光单元及其制造的窗户单元起到至少为选项。
I've had the same thought about window manufacturers. If I owned such an outfit I'd be including sill pans. It's a built in market. If folks are buying windows they'll very likely want them. They will know the pans are made expressly for the windows they're ordering and they'll have the convenience of a single supplier.
My experience looking at damage to framing around windows has been that it was the result of the area being constantly damp, not bulk water intrusion large enough to require drainage. So I make sure the sill is protected with a pan, but don't worry much about sloping it.
对于那些喜欢斜坡的人来说，我发现最简单的方法是运行窗台框架木材，尽管只有6度角的桌子在框架下方的外部锯，而将其剩下的水平留给任何壳体用来。
I've noticed some nice details (I believe on this site in a few places) with a sill that combines a few of those methods. For example, a piece of lap siding to make a slope, butted to a piece of ripped 1X to make a vertical back dam, both liquid-flashed.
That's definitely the belt-and-suspenders approach to bulk water management.
This all gets yet more complicated as we move towards continuous exterior insulation. (IRC2021)
Why doesn't life just get simpler for once!?
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