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.

您的研究可能表明金属屋顶是持久的（50+ years of service life）和耐用的解决方案。而且，如果预期寿命还不够，金属屋顶也需要更少的维护。因此，与传统的带状疱疹相比，这是住宅房屋的出色投资。

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:

• 与带状疱疹相比，金属屋面的成本将多少？您可以通过阅读我们的较早文章来了解有关此信息的更多信息here。
• 是否需要卸下木瓦，还是可以在现有屋顶的顶部安装金属屋顶？当新的金属面板覆盖现有的木瓦屋顶时，它被认为是一个恢复项目。不仅有可能，恢复方法实际上比在安装金属屋顶之前卸下带状疱疹更为普遍。让我们探讨为什么它更普遍。

Five Benefits of a Residential Metal Roof Recover

1.降低成本。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. Peace of Mind.Many homeowners often cite peace of mind as a reason for leaving the original roof in place. Since residential re-roofing projects install pretty quickly, the risk for water intrusion is fairly small, but unexpected storms do happen. With the old roof removed, there’s very little protection until the new roof gets installed. Further, should there be a leak down the road, leaving the existing roof in place provides an extra layer of protection.

3.减少中断。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.Depending on the install method, metal roofing installed over shingles can reduce electrical consumption by 10-25%. This savings occurs when an air space, commonly referred to as “above sheathing ventilation,” exists between the old and new roof and is adequately vented. While there are several ways to accomplish this cavity,our 138T Shingle Recover System这样做，没有安装毛圈条的成本和额外的劳动。

5.可回收性。In addition to their short service life, asphalt shingles are also not an environmentally friendly roofing material. Eleven million tons of shingles are removed every year from existing projects, and it takes 300 years for them to decompose. Consequently, many local landfills charge exorbitant fees to discard shingles.

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.

最重要的是：如果您正在寻找在家中安装金属屋顶的最快且最便宜的方法，那么将现有的木瓦留在适当的位置可能是您最好的方法。

绝大多数房主就是这样做的，没有任何问题。但是，当然，生活中没有任何保证。

Potential issues with installing a metal roof over shingles

将现有的木屋屋顶留在适当的位置并用金属覆盖它有一些风险。让我们仔细看看它们的状态，以便您可以决定对您的独特情况是否更有意义。

被困的水分。如果你的新金属屋顶之间的水滞留and old shingle roof, moisture can accumulate. Trapped moisture can lead to rot and mold. To avoid this problem, contractors can install venting at the ridge and eave or install the new metal panels over furring strips to raise the metal and create the necessary ventilation.

Unknown Damage.When you install a new metal roof over old shingles, you may miss some severe areas of damage hiding under shingles. Some of this existing damage may be mold, rot, or water spots. If you’re facing issues like warped or uneven roof-lines and broken or rotted components, you would be better served to tear off and repair the issues before proceeding with a new metal roof. Conditions such as these may worsen over time and force you to remove the new metal roof at some point so you can resolve the underlying problems from the old roof.

Building Code Issues。根据您的住所，您可能必须在安装新的木瓦或金属屋顶之前撕下旧屋顶。一些司法管辖区要求在安装新屋顶之前取消旧屋顶。其他区域将允许1或2层保留。在进行恢复之前，研究本地代码很重要。在不采取这一重要步骤的情况下，您会冒着合规性问题和罚款的风险。

总而言之，虽然大多数房主选择将现有的木瓦屋顶留在适当的位置，但肯定有一些考虑。如果您想进一步探索这个主题，请查看此问题recent white paperpublished by the Metal Construction Association, or visit theFind a Contractor在我们的网站上部分，并与当地专业人员联系。

住宅金属屋顶选择

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,give our earlier post a read。

一旦您了解了两种附件方法和您的偏好之间的利弊，就可以访问住宅屋顶页面of our website to see our complete product offering or check out some of our most popular residential products below.

隐藏的紧固件系统：

Meridian.如果您正在寻找一个经济的接触式接缝面板，那么我们的子午线面板可能只是门票。子午线面板简单地安装在屋顶甲板上，带有煎饼头紧固件，无需夹子。

Tilcor Stone Coated Shingle.If you’re looking for the look of asphalt shingles but the durability of metal panels, our Tilcor Stone Coated Shingle might be the perfect fit.

138t。138T木瓦恢复系统利用专利的夹子来创建上面的护套通风（ASV）空域，该空域有助于直接安装在现有的木瓦上时产生节省。

奖章。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.

裸露的紧固件Systems

最大框架。Max-Rib's low ¾” rib height is an excellent fit for residential roofing applications.

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

大都市。我们的METTILE产品看起来像陶瓷瓷砖屋顶，但提供了金属屋顶的所有好处。

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 to立即与我们联系。我们期待您的回音！