排水沟系统有两种主要类型：外部和内部。一边美学，两种款式之间的主要区别涉及在排水沟失败时发生的事情。排水沟失效可能从像堵塞的下摊位一样简单的东西发生或作为极端降雨的复杂，超过系统携带的系统。
无论原因如何，当发生故障时发生外部排水沟在建筑物外壳外的水箱外，内部排水系统存放在建筑物内的水中。
外部排水沟系统通常涉及在屋顶的低端（或屋檐）外安装排水沟在建筑物占地面积外。然后，倒下的水管连接到排水沟，允许任何流入排水沟的水排出建筑物外部。
相反，内部排水系统通过将水滤流到屋顶系统内的一系列槽中。然后这些槽将水排入位于建筑物内部的管中。
At first blush, this difference may seem minor but the implications can be potentially serious.
Pitfalls of Internal Gutters
Internal gutters are most common in flat roof applications; however, they are also occasionally designed formetal roofing systems。Their use in metal roofing systems tends to occur when either the building design isn’t conducive to external gutters or when the designer or owner wants to avoid the visual appearance of gutters.
While internal gutter systems aren’t necessarily rare, it’s routinely recommended to avoid them if at all possible. The reasons for this recommendation are numerous.
首先，如前所述，内部排水沟在建筑信封内沉积水。当管排水系统未能正常运行时，水渗透可能导致大楼基础设施和占用者的严重损坏以下：
- Life safety issues such as mold and employee injuries due to slips and falls on wet surfaces
- Water damage to building contents and inventoried products
- 对整个屋顶系统的无法弥补的损坏，包括但不限于绝缘。一旦绝缘变湿，绝缘值大大减少了。此外，可以对与湿绝缘接触的其他建筑部件发生损坏。
Consequently, whenever possible, it’s preferred to use designs that allow water to exit outside of the building envelope.
Secondly, internal gutters can be incredibly difficult to repair or replace because the roofing material is commonly installed on top of the gutter system. When shorter life roofing systems, such as membranes and TPO systems, utilize an internal gutter, replacement of the gutter is less critical as they tend to wear out at the same pace as the roofing system.
但是，当内部排水系统与长寿命产品一起使用时，如metal roofing那which can routinely last 50-60 years, internal gutter repair or replacement can become a major issue.
事实上，业主经常发现自己更换屋顶材料，只需解决内部排水沟替换。因此，应尽可能避免内部排水沟系统metal roofing项目。
内部排水沟的提示
对于无法避免内部排水沟的项目，请考虑以下提示：
- Address internal gutter repair or replacement during the initial building design.
- 内部排水沟应由长寿命材料制成，如不锈钢。
- 在散雪易发的地区，应使用雪卫系统来允许排水沟保持自由排水融化的雪。
- 内部排水沟应设计有连续支撑结构，如胶合板。
总之，内部排水沟已经使用了几个世纪，所以很清楚他们“可以”工作。但它也清楚他们代表了巨大的失败风险，这是最好的避免。
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Since 1963, McElroy Metal has served the construction industry with quality products and excellent customer service. The family-owned components manufacturer is headquartered in Bossier City, La., and has 13 manufacturing facilities across the United States. Quality, service and performance have been the cornerstone of McElroy Metal’s business philosophy and have contributed to the success of the company through the years. As a preferred service provider, these values will continue to be at the forefront of McElroy Metal’s model along with a strong focus on the customer.
