(905) 387 3000

Your roof is one of the most important parts of your home, and keeping it in good condition is essential to protecting your property. Unfortunately, roofs can develop leaks over time, which can lead to serious damage if left unaddressed. A leaking roof can cause water damage to your ceilings, walls, and floors, and can also lead to mold and mildew growth. For those who want long-lasting roofing materials, metal roofs are a great option. Metal roofs are more expensive compared to asphalt shingles, but they last longer and give you value for your investment. During extreme weather conditions, the roofing Hamilton provides you the best shelter by keeping your home cooler in summer and warm during winter. This way, you can save some money on cooling and heating bills. The average homeowner in the Greater Toronto Area will spend quite an amount of money on a new roof. The cost of the project will depend on the size, slope, and complexity of your roof.

D’Angelo and Sons is a family-owned and operated business that has been serving the GTA for over 30 years. If your roof is neglected, get in touch with our team today for a free estimate. For over five decades, roofers in Mississauga have been erecting metal roofs for both commercial and residential clients. If you want your metal roof installed perfectly, then you must reach out to an expert roofing company in Mississauga. Apart from this, to ensure your roof is waterproof, you must maintain your roof and repair it regularly. This article tells you some of the common causes of roof leaks and what you can do to resolve the problem. So, if you’ve been wondering what could cause a metal roof to leak and how to prevent it, read on.

Causes of Roof Leaks – How to Find Where Your Metal Roof Is Leaking And Fix It

1. Corrosion and rust

Rust and corrosion result from a long-term exposure of the roof to hail, snow, ponding water, and rainwater. If your metal roof is uncoated, then exposure to rain makes it rust, resulting in leakages and extensive roof damage. Note that rust also comes with age. However, because your roof is rusted doesn’t mean it is leaking. Slow leak is perhaps the worst type of roof leak. It is hard to find, and by the time you notice it, a lot of damage has been done.

The best way to determine whether your roof is leaking because of rusting is by looking at the nails. If they are rusty, it means the water has been seeping in through them. Apart from this, you should also check for cracks and blisters on the surface of the metal. These are all indications that your roof is leaking and needs repairs.

If you notice rusting on your roof, using a rust inhibitor is the best way to prevent it from spreading. The inhibitor creates a barrier between the metal and water, thus preventing further rust. Also, make sure you clean your roof regularly to remove any debris that could cause corrosion. Missing shingles should also be replaced as soon as possible to prevent rust from developing.

2. Mud seals

One of the leading causes of metal roof leakage is a mud seal. Mud seals occur when there is a regular deposition of dirt along the roof seams. Your roof’s slope and location will determine the rate at which mud seals form. For instance, if your roof is in a dry area, it is likely to form mud seals slowly. On the other hand, if it is in a humid area, the seals will develop faster.

Some dust accumulates in the seams while the rest is washed away with rainwater. During summer, the mud seals dry up, sealing the seams. Some water finds its way into the roofing material the next time it rains. This then penetrates underneath the roofing material. Homeowners around the nation have been finding black streaks on their roofs. These stains are not just unsightly, but they can also be a warning sign of a more serious problem.

To solve this, you need to inspect your roof regularly and clean it when necessary. Use a soft brush to remove the dirt from the seams before it can accumulate and cause a mud seal. Also, ensure you caulk any gaps on the roof properly to prevent water seepage. Improperly installed shingles can also lead to the formation of mud seals.

3. Aging

Aging causes leakages naturally. Whether you keep your roof clean or you don’t clean it at all, with time, it gets to wear out, and before you know it, it will start leaking. The efficiency of metal roofs reduces as they wear away due to aging. It becomes less resistant to harsh weather and unable to withstand corrosion and rust.

The only solution to this problem is quality roof replacement and roof sheathing when it starts leaking. Depending on the severity of the leakages, you can decide to repair rather than replace your roof. Also, how often you maintain your roof will determine how long it lasts. If you take good care of it and repair it when necessary, then it will serve you for a long time.

4. Changes in temperature

Expansion and contraction of metal roofs loosen the fasteners on the roof. Sometimes, the holes stretch, loosening the nails. When heavy rains come, water can penetrate easily through the compromised holes into the roofing material. Once this happens, your roof will start leaking. Ice damming prevents melting snow from draining, causing the water to back up and leak into your home. Your attic is usually the first place you’ll notice this problem.

When you experience a significant change in temperature, it is advisable to check the fasteners on your roof and tighten them if necessary. Also, ensure there is proper ventilation in your attic to prevent the formation of ice dams. Also, make sure you apply caulking around joints and seams to prevent water seepage.

5. Roofing screws

Metal roofing screws are necessary for metal roofs, yet they are the most common cause of leaks. The screws can seal the panels using a rubber washer on the screw head. Ideally, the rubber washer should create a gasket on the space between the screw head and the roof panel if the installation is correct. However, the process usually goes wrong for most people, leading to leaks. Knowing the difference between correctly driven screws and those put in place poorly is essential in helping you determine whether there is a problem.

Correctly driven screws: Driving roofing screws straight at the correct angle of penetration is one of the most popular leaking metal roof solutions. It ensures the gasket is pressed firmly against the surface to prevent the passage of water.

Crooked screws:  Sometimes, misalignment can occur, meaning the rubber washer does not stay flat against the roof surface. In such a case, a portion of the screw becomes unsealed, causing leaks to occur on the roof.

Overdriven screws: Some roofing contractors get carried away when handling roofing screws. They may over-drive a screw as they try to guarantee a tight seal between the screw head and the metal sheet surface. The extra torque breaks the rubber washer and pushes it to the side. The result is the gasket bulging at the sides with poorly attached strip threads.

Underdriven screws: If the screws are not driven in with adequate torque, the rubber washer will fail to attach the way it is supposed to. Not compressing the rubber washer means the gasket will not form, and the roof will leak.

Screws failing to reach the metal strut The rubber washer will not work if the screw does not hit the wood framing underneath or misses the metal strut. The result is leaking that is not too visible, meaning they can cause extensive damage over time. The screw will remain in place without stopping the leaks.

Proper installation of roofing screws does not guarantee the safety of the rubber washer. Seasonal changes can still damage them. For instance, the cold that comes in winter after a hot summer may cause their deterioration. The slow degradation eventually results in loss of the seal, making it harder to identify the leaking screws from those in good condition.

Roofing screws

6. Seams and overlaps

During the installation of metal roofs, metal sheets usually overlap each other, making those sections the most susceptible to leaks. Water damage usually starts at those seams because of the opening that is present. Without proper tightening of the seams, they might open up and create space for water to pass through. In some cases, the leaks occur because of the capillary draw. It is a mechanism that promotes the passage of water between two metal panels regardless of how tightly they are attached to each other. Roofer services usually cover the seams and overlaps with a sealant to prevent the problem.

Applying sealants between the metal panels or using butyl tape to fill the gap can effectively prevent leaks on seams and overlaps. Such measures also stop the accumulation of debris on the roofing material. However, the process requires professional expertise because a single misstep can make the problem worse. Inspecting the roof to ensure the space between the panels is still tightly sealed is also crucial in preventing roof leaks. Your home insurance provider might also have some recommendations on the best way to deal with seams and overlaps.

7. Issues with fastener

Metal roof panels can have clip attachments or rubber washer fasteners, which serve different purposes. The clips attach to the purlin. The roof metal fastener should remain hidden after the crimping of the metal laps on the roof panel. They also have sealants and are placed after every two sq. ft. Regardless of how well you secure them in place, issues with metal roof fasteners leaking are common. They sometimes loosen and detach, creating gaps between the rubber washer and the roofing material. The problem can remain unnoticed for long, meaning the leak can potentially compromise a large roof surface. Inspections during roof maintenance can help you discover the missing fasteners to keep the issue from getting worse.

8. Stack flashings

Another common area likely to cause leaks on roofs is the stack flashing. They usually go around pipes that protrude from the roof surface, such as plumbing, air, and HVAC vents. The flashing protects the intersection between the pipe and roof surface at the point where they come up. Most stack flashing brands use rubber to make them. The material should stay flat on the metal sheet and fit tightly around the pipes. It is the only way to ensure it seals both surfaces properly. Unfortunately, when natural weather elements cause expansion and contraction of the roofing material, the seals become loose, and they start to leak over time. Since the rubber material also has a shorter lifespan than the metal roof, it is bound to begin degenerating sooner with constant exposure to the sun.

So, how do you stop a metal roof from leaking where there is stack flashing? Popular remedies include the application of caulking, tar, or other sealants. Your insurance company might recommend replacing the sealant and rubber material to prevent further damage. However, such solutions do not always last long. Eventually, they start to pool water, resulting in the recurrence of the problem. The best option is to replace the flashing regularly. This is crucial when it starts to show signs of being rotten or worn out. Attic insulation or complete roof replacement are other potential solutions to the problem. Damaged shingles are a primary cause of house leaks, but there are other factors that can lead to the problem. Check if your insurance policy covers leaks resulting from the issues discussed in this article. If it does, you can make a claim to have the problem fixed as soon as possible. Roof repairs are expensive, and it is best to let your insurance company handle the cost. For a free estimate on your roofing project, please call us or fill out our online form.

9. Curb flashings

Metal roofs are known for their durability and ability to handle harsh weather elements. Their installation is usually straightforward. However, if the flashing is not perfect, it will compromise the integrity of the roof.

If you choose to keep your HVAC unit on the metal roof, it will require the curb to remain sturdy. Constructing the curb and the flashing around it is the most challenging part of that installation. Making a mistake, however small, is never an option because it can cause leaks. The contractor must pay close attention to the top two corners of the curb flashing, especially when dealing with sizeable heating and cooling units.

The extra caution is mandatory because water tends to pool behind the flashing and can degrade the sealants. Sealants and caulks can only capture so much water. The only long-lasting remedy would be to replace the metal panels and repeat the installation process.

10. Missing sealants

Sealants and other fixtures used on metal roofs never last as long as the panels do. Therefore, even with proper regular maintenance, they still need replacements. The decision to top off a sealant or replace it entirely depends on where it is. For example, if the adhesive is on the counter flashing, roof transitions, or metal ridge cap trims, it will require topping off regularly. The same applies to sealants on pitch pans, reglets, and Z flashings.

You must select the sealant carefully to ensure it attaches to the trims and paint used on the panels. Next, choose roof screw sealant specifically made for metal roofs. Remember, the expansion and contraction cycle that metal roofs undergo means the sealants also need the same level of flexibility. Otherwise, they will break, and the metal roof will continue to leak.

11. Improper installation for guaranteed roof leak

If your metal roof is not installed properly, then it is likely to leak. Although metal roofs are durable, they are also susceptible to damage if not installed correctly. Some of the common mistakes made during installation include:

-Not installing the drip edge flashing: The drip edge is a metal strip that helps direct water away from the roof. It should, therefore, be installed at the edges of the roof before installing the panels.

-Installing the panels upside down: Metal roofs are designed to direct water off the roof of your house. Therefore, if you install them upside down, they will not function as intended, and water will pool on top of the roof.

-Not installing gutters: Gutters help to collect water from the roof and direct it away from the building. Without them, rainwater will spill over the sides of the roof, causing leaks.

-Installing the panels too close together: If the panels are installed too close together, they will not be able to expand and contract as the temperature changes. This can cause them to buckle and leak, leading to repair.

-Not installing the roofing underlayment: The underlayment is a layer of protection between the roof deck and the metal panels. It helps to prevent moisture from seeping into the roof deck and causing leaks.

12. Poor quality materials

The quality of the materials used to construct a metal roof plays a significant role in its durability and ability to withstand the elements. If you choose to use inferior materials, it will decrease the lifespan of the roof and make it more susceptible to water leakage. Your wall and ceiling might also be at risk of developing mold and mildew due to the damp conditions. Some of the factors that you should consider when choosing materials for your metal roof include:

-The type of metal: The most common types of metal used in roofing are aluminum, steel, and copper. Each has its own benefits and drawbacks. For example, aluminum is lightweight and durable but is also more expensive than steel.

-The gauge of the metal: The thickness of the metal panels is measured in gauges. The higher the gauge, the thinner the metal. Thin panels are more susceptible to damage than thicker ones.

-The type of coating: The coating on the metal panels protects them from corrosion and UV rays. It also affects the color of the roof. The most common types of coatings are acrylic, polyester, and PVDF.

-The warranty: The warranty is an important factor to consider when choosing metal roofing materials. It will give you an idea of how long the manufacturer expects the roof to last. Choose a roof with a longer warranty for peace of mind.

13. Slope

Another common cause of metal roof leaks is a problem with the slope. The slope of the roof affects how well water will drain off it. If the slope is too steep, water will run off too quickly and not have time to drain properly. This can cause pooling and leaks.

On the other hand, if the slope is too shallow, water will not drain off the roof properly. It will pond on the surface and eventually leak into the building. The ideal slope for a metal roof is 3:12. This means that for every 3 inches of horizontal distance, the roof should rise 1 foot.

14. Ice Dam Damage

Ice dams can form on metal roofs during periods of heavy snowfall. They occur when the snow on the roof melts and then refreezes at the edge of the roof. This creates a dam that prevents water from draining properly.

As the water backs up, it can leak into the building through the roof or around skylights and chimneys. Ice dams can also cause the roof to collapse.

To prevent ice dam damage, make sure that your metal roof is properly insulated and ventilated. You should also clear the snow from your roof after a storm.

15. Poorly Maintained Roof leads to Roof Repairs

Finally, a common cause of roof leaks is poor maintenance. A metal roof can last for decades if it is properly maintained. However, if it is not, it will start to deteriorate and leak. Your home’s siding, foundation, and interior can also be damaged by leaks. Costs for roof repairs can quickly add up, so it is important to inspect your roof regularly and fix any problems that you find.

To keep your metal roof in good condition, you should inspect it regularly for signs of damage. You should also clean it periodically to remove dirt, leaves, and other debris. If you notice any problems, have them fixed as soon as possible.

A metal roof is a great investment for your home. However, like any roof, it is susceptible to leaks. By understanding the most common causes of metal roof leaks, you can take steps to prevent them. With proper maintenance, your metal roof will provide you with years of trouble-free service.

Get In Touch With Our Team To Deal With Your Leaking Roof Once and For All

These are some of the most common causes of roof leaks in both commercial and residential buildings. If you take good care of your roof and repair it when necessary, then you can prevent most leaks from happening.

If you fail to look after your roof, you may spend a lot of money on roof repair or replacement. If you do not inspect your roof and repair it quickly, a small leak can cause extensive damage to your property.

You should always hire a professional roofing contractor to help you inspect and repair your roof, your chimney, and assess any potential leaks. They will have the experience and expertise necessary to fix your roof quickly and efficiently, as well as to provide you with a cost estimate. Do not try to fix the problem yourself, as this could make the situation worse. These contractors have the knowledge and experience needed to repair or replace your roof quickly and efficiently. If you maintain your metal roof regularly, it will last a lifetime and help you avoid the cost of putting up a new roof.

Contact Us if You Need Help with Roofing in Mississauga

Always ensure you contact a reliable and experienced roofing company like D’Angelo And Sons if you notice any roof leakages on your property. Remember that your timely response to metal roof leakages can help you spend less when repairing your roof. Contact us at (905) 387 3000 to schedule an appointment with us today.

D'Angelo and Sons | Roofing Mississauga