Initial lower cost and speed of erection are two of the primary reasons that building owners select pre-engineered metal buildings (PEMB) over conventional structures. But there’s more. Business owners also appreciate how easily metal buildings can be modified to gain peak operational efficiency.
The primary differences between a metal building and conventional commercial construction rest with the physical structure itself and the outside covering. Let’s explore each a bit more.
About Pre-Engineered Metal Buildings (PEMB)
金属建筑物具有大，刚性椽框架，通常间隔25至30英尺，通过冷形成，彼此相互连接，16至12号Zee紫线普通间隔5英尺。贴纸蛋白直线运行，没有弯曲，所以当它们安装并且施加死载时，它们将自然地偏转椽子框架之间。（这是一个非常重要的一点，将在后面更详细地解决。）刷子也在椽框架上叠加并彼此连接。然后将金属建筑物的金属屋顶和墙壁连接到顶部或壁纸下的BATT绝缘层。金属建筑物的常见屋顶选项包括26或24个曝光的紧固件板和24或22 Ga。隐藏式紧固件站立缝板。重要的是要注意，暴露的紧固件面板样式为建筑物提供结构隔膜，并且常设接缝板通常不会。因此，当建筑物最初设计和设计时，屋顶覆盖的风格是一个关键元素。
提示：了解暴露的紧固件屋顶面板不仅仅是金属建筑的包层。相反，它是结构本身的一个组成部分，并且需要认真考虑修改。
About Conventional Construction
Excluding water intrusion, metal roofs are typically much less susceptible to damage from hail, and physical damage than the membrane options; however, they can be more susceptible to corrosion from salt spray or chemicals than conventional roof systems such as shingles, single ply or modified bitumen.In conventional construction, the structure supporting the roof system typically consists of pre- cambered bar joist rafters spaced 5 to 6 feet apart with a 22 gauge or heavier roof deck attached to the bar joists. Once installed and the dead loads are applied, the bar joists should level out. The roof system, whether it is metal, single ply, modified or built up, is then attached to the steel deck.Single ply roofs are assemblies made from five to twelve foot wide rolls of reinforced membrane, 40 to 120 mils thick that can be attached to the underlying roof deck in at least 3 different ways. In all cases, there is rigid insulation on top of the steel deck and most of the time there is a fiberglass mat gypsum board between the membrane and insulation. These are assembled and attached to the deck in a very particular manner. Here are ways single ply roofs are attached to the deck.
- 沿着边缘机械地连接到甲板上并在接缝处加热焊接
- Heat welded to the top of special coated bearing plates that sit on top of rigid insulation or cover board. The bearing plates are attached to the deck below with long fasteners.
- 使用粘合剂完全粘附到刚性绝缘层或盖板上。
There are 3 basic types of Single ply membrane on the market today. TPO isa Thermoplastic Polyolefin and is the most popular, least expensive systemavailable. PVC is Polyvinyl Chloride and EPDM is Ethylene Propylene Diene Monomer. Each has their advantages and disadvantages.
屋顶ing Types Summary
For the long term quality minded buyer, a metal building with a站立缝roof提供最长（最昂贵的！）总使用寿命。不幸的是，并非每个新的建筑物所有者都有一个站立缝屋顶的预算。在这些情况下，金属建筑物上的暴露的紧固件金属板提供了可行的解决方案。这些面板类型的字面上有数十亿平方英尺，这些面板类型一直在数十年来表现。问题在于，随着时间的推移，这些暴露的紧固件面板可以开始泄漏，在紧固件将顶板保持在壁板上，围绕渗透和端部圈。这是由于钢板在热循环期间的自然膨胀和收缩发生。
使用单个帘布层恢复金属建筑在这些情况下是一个非常常见的应用程序。所有者经常选择此选项，因为它们比金属屋顶更容易安装，需要为安装程序提供较低的技能，并提供较低的初始成本。
重要的是要记住的是，金属建筑在结构上设计，以满足某种风格的屋面。修改屋顶材料可以完全改变建筑物（或者没有！）表演的方式，如雨雪等装载。然而，业主继续安装膜屋顶系统，该系统是在金属建筑风格设施上进行传统结构的。
那么为什么业主在金属屋顶上安装膜屋顶？
As we’ve seen, these two types of buildings are designed completely different. Why then do building owners throw caution to the wind and think they can mix and match the roofing material? Their decisions usually come down to three factors: cost, performance and a lack of education. Let’s start with cost.
- Cost: In any discussion of cost, it’s important to consider both “initial” costs and costs over the life of the building. When owners are faced with leaks caused by water entering around the fasteners on exposed fastener roof systems, there is no doubt that the “cheapest” initial cost is to place insulation in between the ribs of the panels and then cover the entire surface with a membrane or TPO type material which offers a 15-20 year life expectancy. Installing aconcealed fastener standing seam roof现有小组将具有更高的初始成本;但是，它可以经常预期为所有者提供50多年的无忧服务！
- Performance: Generally speaking, the best long-term performance roofing option for a metal building is a free floating standing seam roof system with limited penetrations and no end lap joints. But as we just addressed, that superior performance comes with a higher investment. Enter the membrane roofing option. While the lifespan of a membrane roof is easily half that of a standing seam roof, they do fall in between the standing seam and exposed fastener options with regard to both price and performance. Both站立缝and membrane systems frequently offer weather tightness warranties, which are not available on exposed fastener panels for obvious reasons.
Summary
所以在恢复之前你应该考虑的五个最重要的事情是什么？exposed fastener metal roofwith a smooth surface membrane?
- How you are changing the loading of the building?
- 建立崩溃的影响是什么？
- 哪些对您的初始成本或总成本更重要？如果是“初始”成本，这一个就会去膜。如果“总”成本，在50多年的使用寿命，这一人就可以到金属。
- 易于安装（膜赢得此）
- Desire for continual repairs and replacement (Metal wins this one)
About McElroy Metal
自1963年以来,麦克尔beplay苹果版手机免费下载beplay在线下载罗伊金属构造ion 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.
话题:Metal Roofing,恢复和改造,Exposed Fastener Panels,Standing Seam Systems,Best Practices,PEMB
