Remove and Replace or Recover - Which type of metal roof is best?

So you’re considering a metal roof for your home. Congrats-even if you decide it’s not the time for a metal roof right now, there’s no harm in exploring options! Ultimately, researching a significant home expense like roofing is a smart move.

Your research will likely show that metal roofing is a long-lasting (50多年的使用寿命) and durable solution. And if the life expectancy isn’t enough, metal roofing also requires much less maintenance. Consequently, it’s an excellent investment for residential homes compared to conventional shingles.

But, if you’re like most folks, you also have lots of questions as you consider metal roofing. Two of the most common we hear are:

• How much will metal roofing cost compared to shingles? You can read more about that by reading our earlier post这里.
• Do the shingles need to be removed, or can you install metal roofing over the top of the existing roof? When new metal panels cover an existing shingle roof, it is considered a recover project. And not only is it possible, the recover approach is actually more common than removing the shingles before installing a metal roof. Let’s explore why it’s more prevalent.

Five Benefits of a Residential Metal Roof Recover

1. Reduced Cost.One of the biggest reasons for leaving a shingle roof in place under a new metal roof involves saving money. When using the recover approach (compared to remove and replace), homeowners save the cost of shingle tear-off and disposal. And who doesn’t love saving money?

2.安心。许多房主经常引用安心作为将原始屋顶留在原地的原因。由于住宅重新屋顶项目的安装很快，因此侵入水的风险相当小，但确实发生了意外的风暴。拆除旧屋顶后，几乎没有保护，直到安装新屋顶为止。此外，如果道路上有泄漏，将现有屋顶留在原地可以提供额外的保护层。

3. Less interruption.Removing a roof is a messy, noisy process. Keeping the old roof in place minimizes the mess, noise and shortens the length of the overall re-roofing process.

4.Reduced Electrical Bills.根据安装方法，安装在带状疱疹上的金属屋顶可以将电消耗降低10-25％。当一个通常称为“上面的通风”的空气空间存在于新旧屋顶之间并且充分排气时，就会节省这种节省。尽管有几种方法可以完成此腔，但our 138T Shingle Recover Systemdoes so without the cost and additional labor of installing furring strips.

5. Recyclability.除了短暂的使用寿命外，沥青带状疱疹也不是环保的屋顶材料。每年从现有项目中删除了1100万吨的带状疱疹，它们需要300年才能分解。因此，许多当地垃圾填埋场收取高昂的费用来丢弃带状疱疹。

Conversely, metal roofing is made from a high percentage of recycled material and is 100% recyclable at the end of its service life. So if you’re concerned with preserving the environment for your kids, grandkids, nieces, or nephews, leaving your existing shingle roof in place and recovering with metal can be a great option.

Bottom line: If you’re looking for the quickest and least expensive way to install a metal roof on your home, leaving the existing shingles in place is likely your best approach.

The vast majority of homeowners do just that and have no issues. But of course, nothing in life is guaranteed.

Potential issues with installing a metal roof over shingles

There are some risks involved with leaving an existing shingle roof in place and covering it with metal. Let’s take a closer look at what they are so you can decide whether a complete roof replacement makes more sense for your unique situation.

Trapped Moisture.如果水被困在新的金属屋顶和旧的木屋顶之间，则水分可能会积聚。被困的水分会导致腐烂和霉菌。为了避免此问题，承包商可以在山脊上安装通风孔，或者在毛茸茸的条上安装新的金属面板以升高金属并创建必要的通风。

Unknown Damage.当您在旧木瓦上安装新的金属屋顶时，您可能会错过一些严重的损坏区域，隐藏在带状疱疹下面。现有的一些损坏可能是霉菌，腐烂或水点。如果您面临诸如扭曲或不平坦的屋顶线以及破碎或腐烂的组件之类的问题，那么您最好在进行新的金属屋顶之前拆除并修复问题。诸如此类的条件可能会随着时间的流逝而恶化，并迫使您在某个时候卸下新的金属屋顶，以便您可以解决旧屋顶的潜在问题。

Building Code Issues. Depending on where you live, you may have to tear off your old roof before installing a new shingle or metal roof. Some jurisdictions require the removal of old roofing before the installation of new roofing. Other areas will allow 1 or 2 layers to remain. It’s important to research local codes before proceeding with recover. Without taking this vital step, you run the risk of compliance issues and fines.

In summary, while most homeowners opt for leaving their existing shingle roof in place, there are certainly some considerations. If you’d like to explore this topic further, check out thisrecent white paperpublished by the Metal Construction Association, or visit the找到承包商section on our website and get connected to a local professional.

Residential Metal Roof Options

一旦你决定whether to remove your shingles or recover them with a new metal roof, you’re ready to determine what style of metal roofing you like. Different expectations require different metal panel alternatives. The best choice for your project depends on factors such as performance, desired longevity, and budget.

One of your first considerations will likely be how the panels are attached to the roof deck. Specifically, are they attached with hidden screws (referred to as concealed fastener systems) or screws that are exposed?

To learn more about this,给我们先前的文章阅读.

Once you understand the pros and cons between the two attachment methods and your preferences, you’re ready to visit theResidential Roofing page在我们的网站上，可以查看我们的完整产品或查看下面我们一些最受欢迎的住宅产品。

Concealed Fastener Systems:

子午线。If you’re looking for an economical snap-together standing seam panel, our Meridian panel may be just the ticket. Meridian panels are simply attached to the roof deck with pancake head fasteners with no need for clips.

Tilcor Stone Coated Shingle.如果您正在寻找沥青带状疱疹的外观，但是金属面板的耐用性，我们的倾斜石涂层可能是完美的选择。

138t。The 138T Shingle Recover System utilizes patented clips to create an Above Sheathing Ventilation (ASV) airspace that helps generate energy savings when installed directly over the existing shingles.

Medallion-Lok. With a 1.75” high seam Medallion-Lok is an excellent choice for larger, custom homes. Medallion-Lok features hidden clips and a snap-together seam which eliminates the need for job site seaming.

暴露的紧固件系统

Max-Rib.Max-Rib的低矮肋骨高度非常适合住宅屋顶应用。

5V.McElroy’s 5V panels are 24" wide and incorporate the classic standing seam design but use an exposed fastener for installation.

Met-Tile.Our Met-Tile product looks like ceramic tile roofing but offers all the benefits of metal roofing.

Thanks for spending a few minutes with us on your journey to research and consider metal roofing. If you still have questions about the process or the problems that come with installing metal roofing over shingles, we encourage you tocontact us today. We look forward to hearing from you!