
Replacing an underlayment might seem daunting, but with the right materials and tools, it can be quite easy. Tile roofs have been used for centuries to provide dwellings with reliable protection from the elements.
However, over time its durability can become compromised due to exposure to moisture and other weather conditions.
Tile roofing systems rely on secure base layers known as underlayment, which helps ensure that tiles remain layered properly and prevents them from becoming loose or shifting.
In this blog post, we’ll discuss how to replace underlayment on tile roof in a few simple steps. We will also explore creative ways to use damaged or extra tiles by repurposing them as covers or ornamental items!
What Will You Need?
To replace an underlayment on your tile roof, you’ll need the following materials and tools:
- Hammer
- Nails
- Replacement tiles
- Sturdy ladder or scaffolding
- Reinforced plywood sheeting (or other suitable material)
- Waterproof sealant
- Roofing paper
Once you’ve gathered all the required materials, you’ll be ready to begin replacing your underlayment.
10 Easy Steps on How to Replace Underlayment on Tile Roof
Step 1: Remove Old Layers

The first step is removing any existing material layers from your roof. Using a hammer and nails, carefully pull up the old tiles and shingles until you can access the underlying layer of plywood or other base material. Be sure to wear protective eyewear when hammering and nailing for safety and to prevent debris from flying into your eyes.
Once all the existing layers have been removed, check for signs of damage on the plywood sheet or other base material. If necessary, use a crowbar or pry bar to loosen stubborn nails that refuse to come out.
Step 2: Install Reinforced Plywood Sheet
If the underlying plywood sheet is damaged or warped, then it’s time to install a new one. Begin by measuring the size of the area that needs to be covered, and then cut your piece of reinforced plywood accordingly. Securely nail down your newly cut plywood in place with special roofing nails.
Step 3: Apply Waterproof Sealant
Once you’ve secured the base layer, it’s time to apply a waterproof sealant over it. Start with a generous amount at the edges and corners before using a brush or roller to spread the product evenly across the entire surface. This will ensure that no water can penetrate the material and cause damage.

Step 4: Install Roofing Paper
After applying the waterproof sealant, install roofing paper on top of it. This layer acts as a barrier between the plywood sheet and the tiles, preventing water from seeping through any cracks or crevices that may be present in your tile. Securely nail down each piece of paper with special roofing nails for added protection against moisture penetration.
Step 5: Place Replacement Tiles
Now that you’ve secured all necessary layers, it’s time to place your replacement tiles onto the roof. Start at one corner and work your way down towards the other end—being sure to line up each tile with the adjacent ones for an even look. Securely nail down each one with roofing nails to prevent them from shifting or becoming loose over time.
Step 6: Apply Grout
Once all of your tiles have been placed, you’ll need to apply grout in between each one for added protection against moisture and other weather conditions. Start at the corner and work towards the opposite end, applying a generous amount of grout between each tile.
Use a trowel or putty knife to spread it evenly across the entire surface before allowing it to set overnight.
Step 7: Inspect Tiles
After allowing the grout to dry overnight, inspect your tiles thoroughly for any cracks or damages that may have occurred during installation. If you find any, use a repair kit to fill in the gaps and ensure that no moisture or other weather conditions can penetrate them. Ensure that all seams are properly sealed and waterproofed before continuing on to the next step.
Step 8: Apply Sealant
Now that your tiles are properly sealed and secured, it’s time to apply a final sealant over the entire surface.
Start at one corner and work your way down toward the other end—being sure to cover all exposed edges with an ample amount for added protection against moisture penetration. Allow the sealant to dry before walking on it or using it as part of your roofing system.
Step 9: Clean Up

Once you’ve finished replacing your underlayment, clean up the surrounding area by disposing of any debris or unwanted materials. This will help to keep your property looking neat and tidy, as well as prevent any hazards from occurring due to loose nails or sharp objects. Don’t forget to double-check for nails that may have been left behind.
Step 10. Enjoy your new roof
Now that you’ve successfully replaced the underlayment on your tile roof, it’s time to stand back and admire your hard work! Be sure to inspect the area periodically for any signs of wear and tear and replace any tiles that may become damaged over time.
Enjoy the peace of mind that comes with knowing your roof is securely in place, and take comfort in knowing that you’ve done the job the right way.
Replacing the underlayment on a tile roof is an important task that should not be taken lightly. By following these steps, you can ensure that your roof remains in top condition for many years to come!
Don’t forget to wear protective gear throughout the entire process for safety and read all instructions before beginning work. Good luck!
5 Additional Tips and Tricks
- Before you start, check the weather. If it’s too hot, wait until it cools down before replacing the underlayment on a tile roof.
- Always use proper safety equipment when working on a roof; wear closed-toe shoes and gloves to protect yourself from sharp edges or slips.
- When replacing the underlayment, make sure to overlap each piece of material by at least four inches—this will help provide extra protection from any water or moisture that may come through the roof.
- Be sure to clean off the existing underlayment before installing the new one; this will help ensure that there is no debris left behind that could affect how effective your new underlayment will be in protecting against water damage.
- Finally, be sure to seal any of the seams where two pieces of material meet; this will help keep out water and moisture even more.
With the right preparation and techniques, replacing the underlayment on a tile roof can be easy for any homeowner!

5 Things You Should Avoid
- Avoid Using Staples or Nails to Secure the Underlayment: Using them to hold the new underlayment in place will damage the tiles and weaken their structural integrity, leading to roof leaks and further repairs. Instead, use a low-tack adhesive specifically made for tile roofs.
- Don’t Forget to Remove Old Underlayment: Before installing any new underlayment, it is important to remove all areas of existing material. This means that any old asphalt felt should be stripped away and exposed nail heads and debris.
- Avoid Overlapping Layers of Underlayment: When possible, try not to overlap multiple pieces of underlayment. Overlapping can cause water to become trapped, leading to mold and rot.
- Don’t Be Sloppy With the Adhesive: Make sure to apply a thin layer of adhesive to both the new underlayment and the roof before securing it in place. Applying too much or insufficient glue can cause the underlayment to shift over time, creating problems with how well it works.
- Don’t Skimp on Quality Materials: Some people may try to save money by using less expensive underlayment or other materials that are not designed for tile roofs. This is a mistake as these products will not provide adequate protection against weathering and may even damage existing tiles or shorten the life of your roof overall. Invest in good quality materials and do the job right.
By following these simple tips, you can be sure that your new underlayment installation is done correctly and safely. Taking a few extra moments to ensure that everything is done properly will give you peace of mind knowing your roof is secure and ready for years of protection and service.
Conclusion
When it comes to roofing, there are many factors that play into ensuring your home is protected. The underlayment of your tile roof is a vital element – and if it needs to be replaced, you’ll want to follow these steps to ensure a smooth process. With a little time and effort, you can rest easy knowing your roof is in good condition!
Although it may seem daunting, replacing your roof’s underlayment is not as difficult as it may seem. With the right tools and materials, your roof can be returned to its original condition in no time. By following these simple steps, you can be sure that your roof will be properly protected from the elements for years to come.
Hopefully, the article on how to replace underlayment on tile roof has provided you with helpful information and a step-by-step guide. If you still have questions, be sure to consult an experienced roofing contractor for help. Thanks for reading!
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