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How to Repair a Leaking Garage Roof

If you’re lucky, some caulk is all you’ll need to fix your leaking garage roof. If things are a bit more complex, you’ll likely have to gather more supplies, such as something to fill the crack, possibly something to prime it, and a sealant.

Are you dealing with a leaking garage roof? Don’t worry. Fixing it doesn’t have to be complicated. With the right supplies and some basic DIY skills, you can repair your garage roof yourself in no time. 

Whether you’re dealing with a minor leak or significant damage, this guide will help you get on top of the problem quickly and easily. Read on to learn how to identify leaks, assess the severity of your issue, and choose the best materials for repairs.

Follow These Steps to Repair Your Leaky Garage Roof

A leak in your garage roof can happen to anyone. Not only will you need the right tools to do it yourself, but you’ll need to follow the right steps.

Inspect the Leak

The first step in repairing a leaking garage roof is identifying the source. If you’re unsure where it’s coming from, try running a hose over all areas of your roof and look for any obvious signs, such as watermarks or damp patches.

Reading for Repairs – Start Your Prep Work

Before getting started, make sure the area is thoroughly clean. Remove any dirt or debris using a broom or vacuum, and make sure all equipment is maintained and ready for work.

Clean the Surface With a Pressure Washer

Next, use a pressure washer to thoroughly clean the area you will repair. It provides a good base for the sealant.

Check Out Your Roofing Timbers

Inspecting each timber will help you spot signs of water damage, such as discoloration or rot and identify areas that need additional attention. Repairing any weakened timbers can ensure a successful repair and prevent long-term issues with the integrity of your garage roof. 

Additionally, it only takes a few easy steps to strengthen fragile wood and return your garage roof to its original condition. By recognizing and tending promptly to any damage in your timbers, you can guarantee that your repair will last for many years ahead.

Fill Holes With Elastomeric Sealant

The reason you want to do this step is both sealant and cement are products that offer long-lasting protection from moisture. 

Elastomeric sealants are highly elastic and create a waterproof membrane that flexes with movement and temperature changes, so they remain effective for months or even years. 

Cement gives you strong adhesion and durability, but it’s essential to use the right type for your specific needs—the kind used for roofs should be designed for outdoor use and be resistant to dirt and water.

Replace Any Tiles That Are Damaged

If you find that the roof tiles have started to deteriorate or have been completely cracked, then it’s time to replace them. 

Start by removing any existing tiles with a pry bar and clean the area of dirt and debris. Measure the space for your new tile carefully, taking into account its width and length, before cutting your new tile to size. 

Once you’ve done this, place the new tile in position and secure it with roofing nails. Finally, use elastomeric sealant or cement around the edges of your tile to ensure a watertight finish.

The Right Tools for Your Repair Job

Not sure what you need to repair your leaking garage roof? We’ve got you covered.

Man’s Best Friend – The Pressure Washer

A pressure washer is an essential tool for any DIY roof repair job. It’s important to use a powerful cleaning agent that can penetrate deep into the surface of your roof and remove any dirt, moss, or mold.

You’ll Need a Putty Knife

A putty knife is a great tool for removing any damaged roof tiles or sealants. They’re also handy for scraping away dirt, moss, and other debris that can accumulate on the roof of your garage.

Nail Heads May Come in Handy

If you’re replacing damaged tiles, you may need to use nail heads to secure the new tile.

Elastomeric Sealant or Cement Is a Must

Elastomeric sealants and cement are essential for creating a waterproof, lasting membrane. Be sure to choose a product designed for outdoor use that is resistant to dirt and water.

If Roofing Tiles Are Damaged, You’ll Want Replacements

If you find that any of your roof tiles have cracked or deteriorated, replace them with new ones. Take care to accurately measure the area for your new tile, and make sure the edges are watertight.

Some Waterproof Coating Is a Nice Touch

A waterproof coating can be applied over your roof for added protection from the elements. Choosing a product specifically designed for outdoor use is important and won’t be easily damaged by weather conditions.

Make Safety the Top Priority

No matter what kind of DIY project you have on your hands, you should always take the necessary precautions to avoid getting hurt. Here are a few tips.

Think About the Height

If you are working on a two-story building or higher, ensure you have the proper protective equipment and harnesses. This will help ensure that you won’t fall from a great height if you slip.

The Right Protective Gear 

Proper gear and clothing include closed-toe shoes, gloves, and a helmet to protect your head from any falling debris or tools. Wear a face mask and safety goggles for extra protection if you use hazardous materials such as roofing nails or cement.

Consider Asbestos Contamination

If your garage roof is older, there may be a risk of asbestos contamination. If you suspect this might be the case, take extra safety precautions and contact a professional for advice.

Repairing a Leaking Garage Roof – Other Considerations

DIY projects have to take many things into account besides the main project. Here are some things you should think about.

Waterproof Everything

When repairing a leaking garage roof, you should take the time to waterproof the entire roof rather than just fixing cracks. This will help ensure your repair lasts for many years in tough weather conditions and prevent further damage caused by leakage.

Check Under the Tiles

Make sure you check the surface beneath your roof tiles for any damage. If left unchecked, small cracks in the underlying material could expand and cause more significant problems.

The Leak Could Come From Multiple Sources

When searching for the source of a leak, don’t narrow your search to just the roof. Check nearby walls and gutters for any signs of damage, as these can be early warning signs that help you locate the original problem.

Check the Timbers

If you’re already on the roof, it’s a good opportunity to check the condition of your garage timbers. Make sure that they are in good repair and free from rot or decay. If necessary, replace any damaged sections with treated wood.

Look for New Projects

It’s also a good idea to check the condition of your garage door while you’re up there. If it is old or starting to fail, now might be the time for an upgrade. Replacing your garage door can help improve energy efficiency and increase security.

Reasons Your Garage Roof Is Leaking

There are several reasons you could be in this situation. Finding the root problem can save you a ton of money and repair time in the long run.

Roofing Panels Are Old

The most common cause of a leaking garage roof is due to old and worn-out roofing panels. Over time, these can become weaker, damaged, or break down, leading to water seeping through the gaps.

Condensation Is a Roof Killer

This happens when warm air passes through the roof and meets cold surfaces such as metal, creating water droplets. If left unchecked, it could lead to water leaking into your home.

Poor Maintenance

A lack of preventive maintenance can cause your garage roof to leak. Regularly checking for any signs of damage or wear and tear is essential in preventing water from entering your home.

A Bad Drainage System

In addition to regular maintenance, check that your garage roof has a functioning drainage system. If this is not working correctly, it can lead to water pooling on the roof and eventually leaking into your home.


Can I fix a roof leak myself?

Yes, you can fix a roof leak yourself if you have the appropriate tools and knowledge. 

How do you fix a leaking roof without replacing it?

To fix a leaking roof without replacing it, you should check the surface beneath your tiles for any cracks or damage and waterproof the entire roof. Additionally, ensure you have a functioning drainage system and that any necessary preventive maintenance is done regularly.

Can you patch a garage roof?

Yes, you can patch a garage roof. Start by repairing any cracks or damage before waterproofing the entire surface. This will help ensure your repair lasts for many years in brutal weather conditions.

What can I put on my roof to stop a leak?

You can use a variety of materials to help stop a leak, such as sealants and waterproofing compounds.

Garage roof leak repair cost

The average cost in the US to fix a roof is right around $1,000.

Quick fix for leaking garage roof

A quick fix for a leaking garage roof is to locate the leak and use a sealant or waterproofing compound to patch it up. Inspect the entire roof for any other signs of damage or wear and tear before completing your repair.

How to fix a leaking roof from the inside

To fix a leaking roof from the inside, start by inspecting the roof for any signs of damage. If there are any cracks or gaps, you can use sealants and waterproofing compounds to fill them in and patch up the area. 

How to fix a leaking roof from the outside

To fix a leaking roof from the outside, start by inspecting the exterior of your home. Once you’ve located the source of the leak, you can use sealants and waterproofing compounds to patch up the area.


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