Metal Roof Over Shingles Problems: 8 Things You Need to Know

Understanding the potential metal roof over shingles problems is essential for homeowners considering this installation method. Metal roof on top of shingles is also a very common project, and comes with special advantages and disadvantages. This can save time and money for homeowners who want to change their roof without having to strip the shingles off. But, like with any roof option, you need to take the pros and cons into account to make sure it is right for you and your home’s design. This article delineates what metal roofs have to offer compared to shingles, so you can make an informed decision.

Why Choose a Metal Roof Over Shingles?

While it’s a practical option for many, there are specific metal roof over shingles problems you should be aware of. We usually decide that we will go with a metal roof instead of shingles because it’s more convenient, more efficient and less expensive. Here are the main reasons this approach works:

Cost Savings

Homeowners often ask about metal roof over shingles problems, especially when weighing costs against long-term durability. You save on labor and disposal from shingle removal and lower the cost of the project. While cost-saving, this method can lead to metal roof over shingles problems if not done correctly.

Time and labour cost are reduced, and this is a realistic choice for a lower-budget homeowner.

Faster Installation

Since the shingle layer is already applied, the work is done in a short amount of time, and the project can be finished faster.

Perfect for homeowners that need protection immediately or who have a project deadline.

Added Insulation

Installing a metal roof over shingles can be efficient, but understanding common metal roof over shingles problems is crucial for a successful project. If shingles are left intact, they add an extra layer of heat and noise insulation that can make your home more energy efficient.

This can be especially useful in places where the temperature is high.

Environmentally Friendly

Leaving the shingles on eliminates construction waste from ending up in the landfill, which is a greener option.

Reuse the current roof structure, it saves the project as much ecological resources.

These benefits alone are why a metal roof over shingle roof is a nice choice, but you’ll also need to know what you can expect when doing so to make sure you get a long lasting solution.

Metal Roof Over Shingles: 8 Main Issues

Metal Roof Over Shingles: 8 Problems Good to Know About

Before committing to this roofing method, it’s important to evaluate the potential metal roof over shingles problems that might arise. Although shingles are the benefit of having a metal roof, there are some problems that homeowners should understand. From moisture issues to structural concerns, this guide addresses key metal roof over shingles problems you should consider.

Structural Concerns

Metal roof over shingles problems can impact your home’s integrity. Adding metal to a layer of shingle just adds extra weight to the roof system. Metal roofs are light in comparison to other roof types, but when multiple roof layers are stacked together, they strain older or compromised roof decks. This may result in structural failure in the long run, especially in dwellings that weren’t built to carry this load.

Trapped Moisture

Knowing the potential metal roof over shingles problems ensures you’re prepared for any challenges during installation. The biggest hazard when you leave shingles up is the possibility that water will get caught between the shingle and the metal roof. This can happen if your shingle roof is leaking or if ventilation is bad. Microbial, mould and rot growth could be caused by confined moisture that can compromise the roof deck and other supporting structure.

Uneven Surface

Curled, cracked or old shingles are going to provide an adobe basis for the metal roof. This makes installation more difficult and may cause visible defects (waviness, sags) in the finished metal roof. Uneven finishes also destroy the watertight bond of the metal panels and increase the chances of leaks.

Decreased Longevity

A metal roof’s lifespan will be impaired if it’s laid over shingles and the bottom layer is already ruined or moisture-ridden. In the long run, these problems can affect the functioning and the life of the metal roof and you may need to repair or replace it sooner than anticipated. If you’re planning to install a metal roof, knowing the metal roof over shingles problems can help you make an informed decision.

Ventilation Issues

Keeping a roof properly ventilated can save any roofing from heat infiltration and condensation. If you simply stick a metal roof over shingles without venting it, heat and moisture will sit on the roof and cause energy waste and damage to the roof deck. If there is not enough airflow, space between shingles and metal panels will cause wear on both.

Warranty Limitations

There may be certain types of installation requirements by the manufacturers of metal roofs for their warranties to hold. : Putting a metal roof on top of shingles that is not up to these requirements will void the warranty and you will be held liable for any future repairs or replacements. Remember to read the instructions of the manufacturer before you try it.

Noise Amplification

And while metal roofs are meant to be quiet, their lack of a flat, well-insulated base will make you more loud during the heavy rains or hail storms. This is especially true if your existing shingle layer has gaps or voids that aren’t good at keeping noise out.

Aesthetic Challenges

When you add a metal roof on top of an existing shingle roof, it can change the look of the roof and give it rolls or an uneven appearance. This won’t affect functionality but can affect curb appeal especially in contemporary or luxury home architecture where a professional finish is desired.

For a long-lasting roof, it’s important to address common metal roof over shingles problems during the planning stage. If you manage these potential issues during the planning stage, you will prevent a lot of them and still get an install job done right that offers the best of both worlds.

Cost vs. Benefit Analysis

Exploring the benefits is important, but so is addressing the metal roof over shingles problems you might face. There are some economic and practical advantages to covering a shingle roof with metal, but you’ll need to weigh those against the costs in the long run. Let’s see how it works to see if this is a fit for you:

Metal Roof over Shingles Problems:

Aspect	Benefits	Costs
Cost Savings	– Eliminates tear-off and disposal expenses, reducing project costs.	– Potential for higher long-term repair or replacement costs due to underlying issues.
Installation Speed	– Faster installation process without removing shingles.	– Faster installation may overlook detailed inspections or prep work, increasing future risks.
Insulation	– Adds an extra layer of thermal and sound insulation, enhancing energy efficiency.	– Poor ventilation or moisture buildup can negate insulation benefits and lead to damage.
Environmental Impact	– Reduces waste sent to landfills, making it eco-friendly.	– Underlying shingle issues can result in frequent maintenance, impacting overall sustainability.
Aesthetic Concerns	– Can be done without compromising visual appeal if underlying shingles are even.	– Uneven shingles may create visible ripples or bumps in the metal panels, reducing curb appeal.
Warranty	– Cost savings from skipping tear-off may outweigh risks if warranties remain valid.	– Manufacturer warranties may be voided if installation doesn’t meet specific requirements.

How to Install Metal Roof Over Shingles To Avoid Problems?

There are options for those homeowners who do not want to take the dangers that come with metal roofing over shingles but who also want the same benefits without the compromise of quality.

Full Roof Tear-Off

Advantages: Taking off the existing shingles gives you the full look at the roof deck so no hidden issues get missed. This gives the metal roof a clean and smooth surface to stand on, allowing for the maximum life and function.

Tips: A tear-off will cost more and take more time to install but, because it’s a one-step process, it gives you peace of mind knowing there is nothing to hide that might turn out to be wrong in the future.

Using Underlayment or Battens

Advantages: A layer of underlayment or battens placed between shingles and metal clapboard will give a flat installation floor. It’s an easier way to improve ventilation, decrease the chances of damp and also makes the final roof look better.

Tips: This takes a little more material and preparation time but is much cheaper and less disruptive than tearing-off altogether.

Installing a Hybrid System

Advantages: A partial tear-off combined with targeted underlayment is a good solution for specific trouble spots without having to take away all the shingles. This translates into savings along with better roof performance.

Factors to Consider: It takes expert knowledge to figure out what needs to go and what can stay.

Which one to opt for is up to your budget, your current roof and long-term plans. Asking a roofer to discuss these with you will make sure the solution is individualized for you.

Tips for Proper Installation

Proper installation minimizes metal roof over shingles problems. Installing a metal roof correctly is extremely important to avoid the usual problems and extend the life of the new roof for homeowners who are choosing metal roof over shingles. Here are a few general tips to help your project get off the ground:

Check and Clean the Existing Roof Prepare the Existing Roof.

Look over the shingles and look for curling, cracks or moisture problems.

Fix missing or damaged shingles and repair structural issues, such as rot or collapsed decking on your roof.

Use a High-Quality Underlayment

Install a synthetic underlayment or insulation between the shingles and metal roofing panels. This gives a cleaner finish, a lot more air flow, and another layer of water resistance.

Ensure Proper Ventilation

Include ridge vents, soffit vents or other air movement systems to keep out heat and moisture. Assists in airflow that makes energy efficient and does not degrade the roof deck over time.

Choose Professional Installation

Hire professional roofing contractors who are well-versed with metal roofing on shingles. Experts are skilled to get the panels right oriented, fastened and sealed.

Follow Manufacturer Guidelines

Conform to the metal roof manufacturer’s installation guidelines to keep your warranty valid. These include spacing, fixings, and procedures specified for your roof material.

Ignoring metal roof over shingles problems may lead to costly repairs.

Many homeowners are surprised by the potential metal roof over shingles problems that can affect the lifespan of their new roof. Preparation and professional expertise go a long way to reduce the risks of this process and ensure you get a quality, long lasting roof.

How Professional Metal Roofing Works

metal roof over shingles problems starts with understanding the challenges

Avoiding metal roof over shingles problems starts with understanding the challenges and how to mitigate them. Quality, durability, and customer satisfaction are all main focuses at Professional Metal Roofing for all our roof installations. We know every home and every circumstance is different so we customize solutions to meet your individual needs. We have the solutions for any project, whether replacing a roof or new roof installation or new construction.

Installing Over Shingles

Many homeowners can save money and time by putting in a metal roof over their current shingle roof. It can be an alternative to a full tear-off that saves time and money but still offers the longevity of a metal roof. We inspect all the shingle surfaces thoroughly and lay quality underlayment so the metal panels can be installed with a smooth and secure foundation. It’s a great solution for any projects where the existing roof is good but outdated.

Complete Tear-Off

If you need your shingles replaced or your roof deck needs a look-up and repair, then a total tear-off is the way to go. With the removal of the old shingles, we can eliminate any hidden problems such as rot or weakness, so your new metal roof will have an impeccable foundation. This is the best solution that offers homeowners maximum sturdiness and peace of mind.

New Construction

On new construction, we work with builders and homeowners to build and put the ideal metal roof on top of it. From a selection of the right materials to the matching design, we give your new roof everything that you want it to look and perform. You will be provided with a high quality, time-efficient and reliable project with our help.

Why Choose Professional Metal Roofing?

Consult professionals to prevent metal roof over shingles problems.

We apply metal roofing year round so there is never a project that gets delayed due to the weather.
Our professional crew guarantees precise, quality installation as per your needs.
We only use the best materials and a 50 year transferable warranty so you will have peace of mind for years.

Are you ready to change your roof for a sturdy and fashionable metal roof? Get a free estimate today by Professional Metal Roofing! Whether you’re looking for over-shingles installation, full tear-off, or new construction, we’ll walk you through the steps and let you know what’s right for your home. Don’t hesitate – get your roof up and running in time for winter and get all-year installation service!

Avoid common metal roof over shingles problems with proper planning.

Takeaways

Metal roofs can save you money and time since they are faster to install and provide insulation. But it is not without risk: damp, structural problems, even aesthetic issues. If you pay close attention to how good your current roof is, ensure that you are installing with quality products, and do the installation correctly, you can minimize these risks and reap the benefits of a metal roof.

In the end, this depends on your budget, your roof and your longer term objectives. Talk to an expert roofing contractor to check if this is right for you and if it will make for a good, long lasting installation.

Addressing metal roof over shingles problems ensures a lasting roof.

FAQs About Metal Roof Over Shingles Problems – Answered

Is It Legal to Have a Metal Roof On Top of Shingles?

YES: Local building codes will permit a metal roof over one layer of shingles in most places. Be sure to check local regulations first.

What About a Metal Roof Over Shingles Lasts How Long?

When installed and kept up, a metal roof over shingles can last 40–70 years. But the problems with shingles can affect longevity.

Will the Warranty Be Voided If I Put a Metal Roof Over Shingles?

There are manufacturers who will cancel warranties if you don’t install it according to their instructions. : Follow manufacturer’s instructions.

Is It Possible To Install A Metal Roof On Top Of More Than One Shingle?

For multiple layers of roof, the building codes and roofing experts usually don’t advise installing over multiple levels for the weight and damage that comes with it.