Skylights坐偶然但不要泄漏！这些存在吗？
我想白天当前未使用的阁楼nder a shingle roof. Because we’re in a historic district, we’re not allowed to visibly alter the roof’s silhouette (so no dormers or protruding skylights). My architect has proposed switching to a standing seam metal roof with thin glass skylights slotting into the metal seams (as seen in the attached pic). I’m worried that the lack of flashing will lead to leaks. Does anyone have experience with skylights that sit flush but don’t leak? Or am I chasing a unicorn?
您的反馈非常感谢！
纳撒利
GBA详细资料库
A collection of one thousand construction details organized by climate and house part
搜索和下载施工细节
Replies
纳撒利,
The only way I can see that system working is with two layers of butyl glazing tape -- under and over the glass, around the entire perimeter -- with aluminum or stainless-steel bars to provide pressure. The metal bars would need to be fastened to the rafters.
有更多的机会，不好的细节和失败，而不是成功的机会，但你可以做到这一点。我以40年前这样的方式建造了一个温室，雪松巴特对丁基玻璃胶带施加压力，尚未泄漏。
纳撒利,
它会泄漏，可能在安装后很快。在最佳情况下，天窗在问题上存在问题。他们是一个非常糟糕的想法。
Don't worry, I'm not planning to DIY this job, a professional roofer would do it! But I am still concerned about leakage due to the lack of flashing--in effect, the only thing keeping water out would be the window's rubber gasket, subject over time to tears, shrinking, cracking etc.
My contractor proposed a creative idea...installing the skylights in the existing shingle roof, but popped out with a few inches of flashing, and then laying a metal roof on battens above the shingle roof that would serve mainly as a rain screen. There would be openings in the metal through which the skylights would be visible. From the ground, the skylights would appear to be flush with the metal roof (thus satisfying the visual requirement), but the flashing would (theoretically) prevent the roof from leaking. The metal rain screen (standing seam or snap lock) would add longevity to the shingle roof and maybe even keep some water away from the skylights.
What do you think of this idea?
纳撒利,
我不喜欢屋顶者的建议。屋顶器显然暗示水被允许进入旧沥青瓦片屋顶和新钢屋顶之间的空间 - 这不是成功的好的食谱。
纳撒利,
I didn't mean DIY as in you doing the work, I mean using a site-built skylight rather than a manufactured one. Your first idea simply won't work. Metal roofing expands and contracts with differing temperatures. That's why things like skylights are installed on a curb with flashing that allows for this movement.
我不知道如何糖大衣：你的承包商新想法是直接的坚果。我不喜欢沮丧的人，但我希望我劝阻你。除非您可以找到制造的低调天窗，否则您将沿着一条导致您解开未来恶化的道路。不要这样做。
天窗 - 永无止境的噩梦。我和他们拥有的一个家，发誓我永远不会拥有或从地狱安装这个设备。除非它们安装100％与冗余的备用系统完美安装，否则在倾斜的屋顶上，否则人们每年都检查它们，否则不要这样做！你会诅咒你安装它的那一天。
除了泄漏之外，大问题也是它基本上是你屋顶上的R-3洞。你有一个R-40 / R-50屋顶，然后这个R-3孔就可以抢夺你的能量。雪，冰和冰雹是其他问题。天窗是坏消息，潮红的天窗是一场灾难。
What we do not know about the picture is how far the glass extends up the roof.If it extends up towards the peak significantly it may not leak.
作为一份说明，我的3个1/2沥青的4个遏制天窗，在5 +岁时不会泄漏[水，热量是另一个故事]
If I were to postulate a watertight solution to the ridiculous historic requirements.........
If you were to mount a fixed skylight to the sheathing, with ice and water shield in such a way that it was water tight [say 3 feet to either side] prior to the roofing being installed.
安装者,这样安装的屋面was slightly higher than the top surface of the skylight.
Install tempered glass panels in place of the metal roofing from roof peak to well below the skylight, above the surface of the skylight. Any break in this section of panel must be lapped shingle fashion.
On the sides the standing seam metal will overlap the tempered glass by say at least 6 inches
the edges of the tempered glass has a generous bead of sealant, continuous peak to eave. Inboard of that bead of sealant a series of diagonal beads of sealant angled downhill and not quite reaching the vertical bad of sealant or the edge of the overlapping metal roof. This guides water away from the edge of the glass.
基本上认为暴露的金属谷以及那些密封的方式，大多依赖于重力
Is it ridiculous? no more than the historic districts rules, most likely a ridiculous overreach of their mandate, but I will bet it won't leak.
屋顶应该是由于重力而没有密封剂的水，并且应该至少有一个双重措施。如果您在没有密封剂的情况下设想我的解决方案，它不会由于玻璃上的金属的间距和6英寸重叠而泄漏。密封剂防止风吹过水侧面。当[不是如果]他们未能在水平脚下的冰和水中工作时应该将水导向到屋顶边缘。实际的天窗只是空气和热障碍
God knows who you would get to install such a ridiculous system and how much they would charge, but hey, it would follow the rules............
基思写道：
“如果您在没有密封剂的情况下设想我的解决方案，它不会由于玻璃上的金属的间距和6英寸重叠而泄漏。”
It would leak like a sieve. Capillary action would draw the water between the glass and metal. The main reason you don't see certain details in buildings is that they don't work. Relying on multiple layers of sealant, having no strategy for dealing with the expansion at the perimeter when the water freezes, nothing to deal with the differing coefficients of expansion of the two materials - it's a really risky solution.
Funny Malcom, open metal valleys do not leak.
我的观点是你应该设计一个没有密封剂的重力泄漏的系统，即密封剂应该始终是冗余。在这种情况下，密封剂不是如此密封剂作为坝重定向风驱动雨水返回到玻璃上。
所有的瓦片屋顶都假设有“泄漏”，那么自排水
我的描述并非如此建议的解决方案，作为对图片可能会如何工作的解释，并显示奇怪的极端可能必须去满足一个荒谬的委员会
Keith, I agree entirely with your post and the point you make about gravity and sealants. I was simply piling on agreeing with your conclusion that it isn't a good idea, no matter how well done, so that nobody ends up trying it.
我不知道为什么没有想到它之前，但是瓦楞屋顶是在1820年代发明的，一些可爱的波纹金属屋顶，哦，所以别致的玻璃纤维镶嵌天窗板。
想知道委员会是否会在提交后让你在常规天窗中放置..........