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How to Replace Garage Roof: A DIY Guide.

To replace a garage roof, remove the old roofing materials and install new ones. This process involves stripping off the old shingles or metal roofing, fixing any underlying damage, and then installing the new roofing materials.

Garage roofs eventually wear out, and need replacement. This can be due to weather damage or just regular wear and tear. Whatever the reason, if you need to replace your garage roof, you should carefully plan the work to ensure you get the best outcome.

Before starting, you need to assess the damage and plan the work. Next, you need to select the right materials and tools, and then remove the old roofing materials. Once the old materials are removed, you can inspect the roof structure for any damage and make repairs as needed. Afterward, install the new roofing materials carefully, so your garage is fully protected against the elements.

How to Replace Garage Roof: A DIY Guide.


Inspecting The Roof

Safety Measures Before Inspection

Inspecting your garage roof might seem like a simple task, but it’s essential to prioritize safety above everything else. Before you climb up to inspect your roof, ensure that you have all the necessary safety gear, including gloves, safety glasses, and a helmet.

Here are some safety measures you should take before starting your inspection:

  • Make sure the ladder you’re using is sturdy and stable.
  • Try to inspect the roof during a sunny day to avoid slippery conditions.
  • Avoid going on the roof during windy or rainy weather.
  • Ensure that a friend or family member is present to assist you if anything goes wrong.

Identifying The Type Of Garage Roof

Different types of garage roofs exist, so before you start your inspection, it’s crucial to identify the type of roof your garage has. Here are some common types:

  • Flat roof
  • Hip roof
  • Gambrel roof
  • Gable roof

Assessing The Condition Of The Roof

After identifying the type of roof, the next step is to assess its condition. There are several things to look out for, and here are some key points to guide you:

  • Check the shingles or tiles for signs of damage or wear and tear.
  • Inspect the flashing around vents, chimneys, and other roof fixtures for any signs of damage or rust.
  • Look for any signs of water damage or leaks on the inside of the garage, such as water stains on the ceiling or walls.
  • Determine the age of the roof. A well-maintained roof can last up to 20 years.

Detecting Damaged Areas

It’s essential to detect any damaged areas on your garage roof to determine if you need a replacement or repair. Here are some things you should be on the lookout for:

  • Missing or cracked shingles or tiles.
  • Damaged flashing or rusted metal.
  • Curling or buckling shingles or tiles.
  • Significant staining or sagging on the roof.

Inspecting the garage roof might be a diy task, but it’s crucial to prioritize safety and take the necessary precautions to avoid accidents. Identifying the type of garage roof, assessing its condition, and detecting any damaged areas are the key points to consider when inspecting your garage roof.

Planning The Replacement

Replacing a garage roof can be a daunting task, but with proper planning, it doesn’t have to be. Here are the key points to consider when planning the replacement:

Calculating Required Materials And Tools

Before replacing the garage roof, it’s essential to determine the required materials and tools to complete the project successfully. This includes:

  • Measuring the roof’s size to determine the quantity of materials needed
  • Choosing the appropriate roofing material based on local climate conditions
  • Investing in the required tools, such as a saw, hammer, roofing nailer, measuring tape, and safety gear

Budgeting For The Project

Like any home repair project, replacing a garage roof comes with a price. To avoid overspending, it is crucial to create a budget that covers all necessary materials and labor costs. This includes:

  • Estimating the cost of materials and tools
  • Researching the cost of labor in your area
  • Setting aside additional funds for unexpected expenses

Obtaining Necessary Permits

Before replacing a garage roof, it’s essential to check with your local zoning authorities and acquire necessary permits. This ensures you comply with the local building codes and regulations. Ensure you get:

  • A permit from your local government office
  • An inspection once the project is complete to ensure compliance

Setting A Realistic Timeline

Replacing a garage roof can be time-consuming, but with a realistic timeline, the project can be completed efficiently. Here are the essential points to consider:

  • Estimating the required time for purchasing materials and tools
  • Taking into account the local weather and seasonal changes
  • Allocating enough time for the project to avoid rushing

Careful planning is key to a successful garage roof replacement. By considering the above points, you can successfully replace your garage roof with minimal hassle.

Removing The Old Roof

Clearing the work area of debris and hazards:

Before beginning the process of removing the old garage roof, it’s critical to get rid of any debris and clear the work area of any potential hazards. Move any tools, equipment, or materials that are not needed to a safe location, and cover everything that can’t be moved.

Steps for dismantling the old roof:

Now that you’ve cleared the work area, it’s time to start dismantling the old roof. Follow these steps:

  • Begin at one end of the garage and start removing the shingles. Use a prying tool to lift them away from the roof deck carefully. Be cautious not to damage other shingles in the process.
  • Once you’ve removed all the shingles, detach the drip edge carefully. In most circumstances, the drip edge is nailed to the fascia board. Use a hammer and a roofing pry bar to detach the nails without damaging the fascia board.
  • Now that you’ve removed the drip edge, you can begin detaching the flashing. Use a chisel to release it from the roof deck where the flashing is attached. Remove all nails found on the flashing by using the claw end of a hammer.
  • After all the flashing has been removed, detach the roof sheathing using a reciprocating saw. Slice through the seams and cut along the roof trusses.

Proper disposal of old roofing materials:

Once you have finished dismantling the old garage roof, concentrate on disposing of the old roofing materials properly. It’s critical to avoid stacking waste materials on your property or in a landfill. Below are some guidelines for proper disposal:

  • Check with your municipality to determine the right location to dispose of old roofing materials. Some cities may have specific rules on the disposal of used roofing materials.
  • Make sure to dispose of old shingles in a way that will not result in environmental pollution. You may choose to dispose of the roofing shingles at a roofing depot, or you could contact a roofing contractor who will recycle them for you.
  • Check with your area’s waste management department to see if they accept old roofing materials, and if that is the case, review their regulations. Some landfills may not accept asphalt shingles.

By following these guidelines, removing an old garage roof and disposing of old roofing materials becomes easier. It’s crucial to get the job done correctly to maintain your property’s safety and ensure a successful roof replacement.

Preparing The Underlayment

Choosing The Right Underlayment Material

Before replacing the garage roof, it is crucial to choose the right underlayment material. The underlayment acts as a protective barrier against moisture, wind and other elements. Here are some common underlayment materials you can choose from:

  • Felt underlayment: It is relatively inexpensive, easy to install and suitable for moderately steep slopes. However, it tears easily and can be prone to leaks.
  • Rubberized asphalt underlayment: It is more durable and resistant to water and heat. It provides better protection against ice and water damming, making it ideal for areas with harsher climates.
  • Synthetic underlayment: It is lightweight, easy to install and offers better protection against water and wind. It is also resistant to tears and punctures, making it highly durable.

When choosing the underlayment material, consider the climate, roof slope and budget.

Measuring And Cutting Underlayment

Before installing the underlayment, measure the roof to determine the amount of material needed. Add an extra 10% to account for waste and overlap. Use a measuring tape to get accurate measurements.

Once you have the measurements, cut the underlayment into strips that are wide enough to cover the roof’s width. Use a utility knife or roofing scissors to cut the strips. Make sure to cut the pieces to the appropriate length for each section of the roof.

Installing Underlayment

Now that the underlayment is ready, it is time to install it. Here are the steps to follow:

  • Start at the lower edge of the roof and roll out the first sheet horizontally, leaving a 2-inch overhang on the eaves. Ensure that the felt lies flat on the surface of the roof.
  • Nail down the underlayment using roofing nails. Space them about 6 inches apart along the edges and 12 inches apart in the field. Avoid overdriving the nails as this can damage the underlayment.
  • Repeat the process, overlapping the sheets by at least 2 inches to ensure there are no gaps. This will provide complete coverage and prevent water from seeping through the roof.

Properly installing underlayment is crucial for long-term roof durability. Follow these steps to ensure lasting protection against harsh elements.

Installing New Roofing Materials

Replacing a garage roof can be a daunting task, but with the right materials and installation instructions, it can be done as a diy project. In this guide, we’ll cover everything you need to know about installing new roofing materials for your garage.

Let’s get started!

Choosing The Right Roofing Material

Choosing the right roofing material is the first step in replacing your garage roof. Here are some factors to consider:

  • Climate: Choose a material that is suitable for your climate. For example, if you live in an area with heavy rainfall, a metal roof might be a good option.
  • Durability: Make sure the material you choose is durable and long-lasting.
  • Price: Take into account the cost of the material and installation fees.
  • Appearance: Choose a material that complements the style of your garage.

Measuring And Cutting The Roofing Material

Once you’ve decided on the right material, it’s time to measure and cut it to size. Follow these steps:

  • Measure the dimensions of your garage roof using a tape measure.
  • Use a chalk line to mark straight lines on your material where you need to cut.
  • Use a circular saw or tin snips to cut the material to size.

Installing Shingles/Sheets/Tiles

The installation process varies depending on the type of material you choose. Here are some general steps:

  • Lay the first row of shingles, sheets, or tiles along the bottom edge of the roof.
  • Secure the material in place with nails or screws.
  • Continue adding rows until you reach the top of the roof.
  • Cut the final row to size using a circular saw or tin snips.

Nailing And Sealing The Roofing Material

To ensure your garage roof is watertight, it’s important to nail and seal the roofing material properly. Here are some tips:

  • Use roofing nails or screws to secure the material to the roof.
  • Make sure to space out the nails or screws evenly.
  • Apply a sealant to the edges of the roofing material to prevent water from seeping in.

That’s it! By following these steps, you can successfully replace your garage roof with new roofing materials. Remember to prioritize safety during the installation process by wearing gloves and safety goggles.

Adding The Finishing Touches

Congratulations, you have successfully replaced your garage roof. But, wait, you are not quite finished yet. There are still a few final touches you need to complete before you can sit back and admire your hard work.

Installing Gutters And Downspouts:

One essential aspect of roofing is installing gutters and downspouts that prevent water damage to your house. Consider the following points when installing them:

  • Choose quality materials that ensure durability of your gutters and downspouts.
  • Install the gutters and downspouts as close to the ground as possible.
  • Install downspouts in a manner that ensures they face away from your home’s foundation to prevent water damage.

Cleaning Up The Work Area:

It’s essential to clean up post-replacement. The last thing you want is the debris from your old roof lingering on your property. Here are a few points to consider:

  • Dispose of old shingles and other materials at your local facility.
  • Use a magnetic broom to pick up stray nails or other metal debris.
  • If necessary, patch up any lawn or garden areas that might have been damaged during the roof replacement.

Evaluating The Final Product:

Before you can finally say you are done, it’s important to evaluate your handiwork. Here are some things to consider:

  • Check to see that your new roof is free from any defects or damage.
  • Check for leaks.
  • Make sure all newly installed fixtures work correctly, such as flashing and gutters.

Tips For Prolonging The Life Of The New Roof:

Now that you have a new roof, it’s important to maintain it to extend its life. Here are a few tips to help:

  • Perform routine inspections of your roof, generally at least twice a year.
  • Keep the roof clean from debris, moss, leaves, and algae.
  • Schedule professional maintenance at least once a year, or as recommended by the manufacturer.

By adhering to these guidelines, you’ve successfully replaced your garage roof and can rest assured that it’s well-maintained and will serve its purpose for many years.

Frequently Asked Questions On How To Replace Garage Roof

How Much Does It Cost To Replace A Garage Roof?

The cost to replace a garage roof depends on the material and size, ranging from $500 to $5000.

What Is The Process Of Replacing A Garage Roof?

The process of replacing a garage roof includes taking measurements, removing the old roof, installing new underlayment, and installing the new roof.

How Long Does It Take To Replace A Garage Roof?

The time it takes to replace a garage roof depends on the size and complexity of the project, but typically takes 1-3 days.

What Materials Are Used To Replace A Garage Roof?

Materials used to replace a garage roof include asphalt shingles, metal, clay and concrete tiles, and flat roofing materials like epdm or tpo.

Can I Replace My Garage Roof Myself?

While it is possible to replace a garage roof yourself, it is recommended to hire a professional to ensure proper installation and safety measures are taken.

How Long Does A New Garage Roof Last?

The lifespan of a new garage roof depends on the material used. Asphalt shingle roofs last 15-30 years, metal roofs last 40-70 years, and clay and concrete tile roofs can last up to 100 years.


To sum up, replacing a garage roof may feel intimidating, but with the right tools, materials and guidelines, it can be accomplished with relative ease and minimum hassle. Before beginning, it is important to evaluate the roof’s structural integrity and invest in necessary safety equipment.

Be sure to remove damaged materials and measure precisely before purchasing and installing new roofing materials. While replacing a garage roof is a significant undertaking, it can also increase the value of your home and provide long-term peace of mind.

With these tips in mind, you can successfully complete the job and enjoy a sturdy, weather-resistant garage roof.