How To Repair Roof Siding? (Explained)

You might be wondering how to repair roof siding, and you don’t have to worry. It’s actually quite simple. 

In this article we’ll walk you through each step of the process, from removing damaged boards to installing new ones and everything in between. Let’s get started!

Roofing Repair and siding repairs
Repairing the damaged exterior of your home can be a daunting task, but it’s often necessary to prevent further damage or issues down the line.
Understanding how to address common issues with your home’s siding, windows, plumbing, and other exterior features can save you time, money, and stress in the long run.
Don’t be afraid to seek out professional help if you’re unsure about how to address a particular issue, or if you lack the necessary skills or equipment to do so safely and effectively.
By taking care of your home’s exterior and keeping it in good repair, you can boost your curb appeal, increase your home’s value, and enjoy the peace of mind that comes with knowing your home is in excellent condition.

Step 1: Remove The Rotten Boards

Remove the rotten boards. With a pry bar, carefully remove all rotted wood and mold or mildew on the siding with a hammer and chisel. Be careful not to damage any surrounding siding when removing these boards, as this can lead to more expensive repairs later on down the road if done incorrectly.

Check for water damage up in your attic. If you suspect that there is some sort of moisture issue going on up in your attic, then it may be best just to do an entire roof replacement instead of trying to repair what’s already there if there isn’t much support for it anymore!

If you’re experiencing issues with the windows in your home, it’s important to address them quickly to prevent further damage. Learn how to repair your window frame with Unified Haven’s step-by-step guide, How to Repair Home Window Frame, and ensure your windows are functioning properly for years to come.

Step 2: Install Z-Flashing Above Window

Z-flashing is a piece of metal that’s placed on the face of the brick or stone that runs up to the bottom of your window. 

It’s used to divert water away from your home, keeping it from getting into your siding and basement walls. In order to install Z-flashing, you’ll need a hammer and two pry bars (the kind with rubber ends work best).

First, measure how long your piece of Z-flashing needs to be based on how far down it goes from the top of your window; then cut out two pieces using tin snips or a hacksaw. 

Next, place one end against an edge on either side of where you want them installed and tap them with a hammer until they’re firmly in place at an angle away from each other at about 45 degrees; then repeat for other side so there’s no gap between pieces where water could collect behind them.

Install Z-Flashing Above Window

Materials Needed
Tin snips
Measuring tape
Caulking gun
Exterior caulking
Measure the length of the area above the window where you want to install the Z-flashing.
Use tin snips to cut the Z-flashing to the appropriate length.
Position the Z-flashing so that it sits in the brick or stone and runs up to the bottom of your window.
Hammer nails through the Z-flashing and into the wall to secure it in place.
Use a caulking gun and exterior caulking to seal any gaps or spaces around the flashing.
Use a J-roller to ensure the flashing is firmly and evenly secured against the wall.
Repeat the process on the other side of the window, if necessary.
Clean up any debris or excess caulking once the installation is complete.

Step 3: Install New Boards

Once the nails have been properly set, you can begin to install new boards. Before doing so, make sure that the boards are level, straight and plumb.

If you’re using a hammer and nails to install new boards, make sure they are placed at an angle of 45 degrees along each side of your roof’s pitch. 

This will ensure proper drainage on your roof and protect it from water damage. Next, use a level to check that each board is properly aligned horizontally before installing it using 6d galvanized finish nails (the type with plastic collars).

Dealing with plumbing issues on your own can be overwhelming and lead to further problems down the line. Before you dive in, be sure to check out Unified Haven’s Pro Guide to Fixing Plumbing to learn about common issues and how to address them properly.

Step 4: Fill In With Wood Putty

Once you’ve removed all the excess putty, use a putty knife to apply it to the remaining areas of siding. Make sure you cover the entire area of the hole, as this will help with finishing. 

When you’re done applying wood putty and have let it dry completely (you can use your hand over it to test for dryness), wipe away any excess with a damp cloth and let dry again before moving on to step 5!

Step 5: Prime The New Wood

Now that your new wood pieces are in place, you’ll need to prime them. Priming is a process that helps prepare the surface of the wood for painting. It helps fill any gaps and creates a good base on which to lay down paint.

You can choose any kind of primer you want, but most experts recommend using an exterior-grade primer with one coat of clear acrylic latex paint on top (again, this depends on what type of siding you have). 

You can also use masonry stains or water-based paints if they’re available in your area—just make sure they’re labeled as suitable for exterior use so they’ll stand up against weathering well over time.

Accidents happen, and small plaster repairs are a common fix when it comes to repairing walls and ceilings. If you’re unsure how to fix minor plaster damage, check out Unified Haven’s How to do Small Plaster Repair Explained for a comprehensive guide on making repairs.

Step 6: Install A New Layer Of Underlayment

Underlayment is a critical component in shingle installation, so it’s important to make sure you’re using high-quality materials. 

You’ll want to use either tar paper or felt as your underlayment, as these are both waterproof and durable enough to withstand years of exposure on the roof. 

Felt tends to be less expensive than tar paper, but since it isn’t as sturdy or long-lasting as its counterpart, it may be better suited for smaller homes or apartments with lighter loads (i.e., fewer people living there).

Tar paper should be available at most hardware stores; once installed over the old shingles and around any penetrations such as vents or skylights that stick through from below your roof decking, this will prevent water from getting into those areas while also providing additional protection against wind-driven rainstorms and heavy snowfall during winter months like we’ve been experiencing lately across much of North America right now!

Install a New Layer of Underlayment

Materials Needed
Roofing underlayment, such as felt or synthetic
Measuring tape
Utility knife
Metal flashing
Roofing cement
Safety gear (gloves, eye protection, non-slip shoes)
Measure the length and width of the roof area where you will be installing the new underlayment layer.
Cut the underlayment material to fit the area you measured.
Starting at the bottom edge of the roof, lay the underlayment horizontally, overlapping each previous layer by 2-3 inches.
Secure the underlayment to the roof with nails spaced every 6-8 inches, either using a hammer or a nail gun.
Install metal flashing, if needed, at all valleys, chimneys, and roof edges, and secure it with roofing cement.
Cut holes in the underlayment for any vents or other protrusions, using a utility knife.
Add additional underlayment layers as required by local regulations or your building’s specific needs.
Finish by installing your shingles, making sure to properly overlap the underlayment and use the appropriate materials.
Always wear safety gear, including gloves, eye protection, and non-slip shoes, when working on a roof.

Step 7: Install Drip Edge And Shingles

The next step is to install the drip edge. This is the thin piece of metal that runs along the top edge of your roof, just under where your shingles meet. 

It helps divert water from getting into your home and causes it to run down the sides of your house instead, so you don’t have any problems with leaks inside.

Now that you know what drip edge is, here’s how to install it:

Installing landscaping edge around your home is a great way to add curb appeal and prevent soil erosion. If you’re looking to spruce up your yard, check out Unified Haven’s How Do You Install Landscaping Edge Explained for a step-by-step guide on how to install this simple landscaping feature.

Step 8 : Install J-Channel Around Windows

The J-channel is a metal strip that helps to support the siding. This piece of material is installed around each window and nailed into place with galvanized nails. 

Once the J-channel has been installed, it’s painted to match your existing siding so that it blends in seamlessly with your home’s exterior color scheme.

Step 9 : Install New Vinyl Siding Over The Top Of The J-Channel

If you’ve removed your existing siding, you’ll need to install a new piece over top of the new J-channel that was installed in Step 7. Use a caulk gun to apply roofing cement along all edges and seams, making sure to fill any space between boards with caulk.

Understanding the benefits of plumbing in your home can help you appreciate the modern conveniences many of us take for granted. Check out Unified Haven’s What Are The Advantages of Plumbing? Find Out for an in-depth look at the importance of plumbing systems in our homes.

Step 10 : Cut The New Piece Of Soffit To Fit

When cutting new siding, you want to be sure that it fits perfectly.

First, measure the old piece of siding and make note of its measurements. Then, cut your new piece of siding so that it will fit into place on your home.

It’s best to use a circular saw for this step, as long as you can handle it safely. The blade should be sharp and steady at all times while making the cut; otherwise, the blade could slip and cause injury or damage to your home or yourself. Be sure to wear safety goggles during this step!

Step 11 : Slide It Up Into Place Above The Damaged Section And Nail It In Place

Slide it up into place above the damaged section and nail it in place.

Make sure that you have the same size and shape soffit as what is there now.

Make sure that you have the same angle for your new piece of soffit as what is there now. This helps to keep water from running down behind your siding, which can cause rotting and other problems with your house’s structure over time, not to mention leaks!

If there are gaps between these pieces of siding, caulk them closed with a silicone-based caulking gun like this one:

Step 12 : Use A Caulk Gun To Apply Roofing Cement

At this point, you should have all the replacement pieces you need. You’ll also likely be using a caulk gun to apply roofing cement, which is an essential part of the process because it helps give your siding that finished look and seals in moisture so your home doesn’t suffer from rot from underneath.

However, it’s important not to overdo it with the cement here. A thin layer of cement is best because too much will cause the new siding piece to slide down during installation (and possibly into some other part of your home). 

Also make sure that you apply enough cement around each edge of your new piece so that they are sealed on all sides before installing them into place!


If you’re looking for an affordable and effective way to repair your damaged siding, then this article is for you. 

We hope that we have given you enough information here so that when faced with this problem yourself, you will know what steps to take.

Further Reading

If you’re interested in learning more about siding repair, check out these informative resources:

Better Homes & Gardens: How to Repair Siding: A comprehensive guide to repairing various types of siding, including wood, vinyl, and more.

Forbes: How to Repair Vinyl Siding: Tips and tricks for repairing vinyl siding, one of the most popular types of siding in the U.S.

PJ Fitz: How to Repair Wood Siding: A step-by-step guide to fixing common issues with wood siding, from rot and insect damage to cracking and peeling paint.


What are some common issues that may require siding repair?

Some common issues that may require siding repair include cracks, dents, holes, and fading or discoloration.

How do I know if my siding needs to be repaired or replaced?

If your siding is extensively damaged or beginning to show signs of wear, it may be time for a full replacement. However, minor issues can often be repaired with the right tools and techniques.

Can I repair siding damage on my own, or should I hire a professional?

The answer depends on your level of experience with home repairs and the severity of the damage. Minor repairs may be manageable for DIY enthusiasts, while larger repairs or full replacements may require the help of a professional.

What tools and materials will I need to repair siding?

The tools and materials needed to repair siding can vary depending on the type of siding and the extent of the damage. At minimum, you will need a ladder, replacement siding material, a hammer, a utility knife, and nails or screws.

Are there any safety precautions I should take when repairing siding?

Yes, it’s important to take safety precautions when repairing siding, especially if you’re working on a ladder or roof. Always wear safety gear, including gloves, eye protection, and non-slip shoes, and be sure to follow proper ladder safety guidelines.