Your roof goes through countless rainstorms in its lifetime, and you wouldn't want one of these to invite a leak into your house. A roof leak is far from rare and it might be a sign that your underlayment is failing.
While tiles themselves often last long, the underlayment does not last as long. If you've noticed any signs of aging on your roof, or if it's been a while since the last inspection, it could be time for a check-up.
Ignoring these signs can lead to more severe damage, not just to your roof but also to the interior of your home. Replacing tile roof underlayment ensures that there are no leaks and that the lifespan of the tile roof is ensured.
Before going up a ladder and stripping away the old tiles, you need to know what makes up the roof. The underlayment is not a visible layer, but it is important to make your roof whole.
It is your roof's first line of defense against water intrusion and weather damage. The right underlayment can extend the life of your roof tiles by blocking moisture that might otherwise weaken them over time.
It is essentially a barrier material installed directly onto your roof deck under all other roofing materials as an added layer of protection from severe weather. Without it, even minor leaks can lead to major issues.
There are a number of underlayment to choose from when building your roof. Each have unique benefits for different roofing conditions and climates.
Felt underlayment, often referred to as tar paper, is the traditional choice that has been used in roofing for decades. It’s made from either organic or fiberglass substrate coated in asphalt. Felt comes in two main types:
This is made from recycled paper and wood fibers saturated with asphalt. It’s heavier and more water-resistant than many other underlayments but less durable when exposed to UV rays or high temperatures.
This type combines fiberglass with asphalt, offering improved resistance to tearing and better stability in high temperatures. Felt underlayment is usually less expensive than synthetic alternatives and works adequately for many standard roofing projects.
However, it can absorb water, become brittle, and break down faster if exposed to prolonged moisture or high temperatures.
Synthetic underlayment is a more modern solution made from woven or spun polyethylene or polypropylene. It is engineered to offer several advantages over traditional felt, including:
Synthetics are much stronger than felt and can withstand high winds and foot traffic during installation. They are lighter per square foot, which makes them easier and faster to install.
The materials also don't absorb water, which helps prevent mold growth and decking rot. Some synthetic underlayments are resistant to UV degradation, allowing them to be exposed for weeks or even months during prolonged construction projects.
Rubberized asphalt underlayment provides the highest level of waterproofing and protection. It contains rubber polymers and asphalt that create a waterproof barrier.
The rubberized nature of the material allows it to seal around nails that penetrate through, which greatly reduces the risk of leaks. This type of underlayment typically features a peel-and-stick application that bonds securely to the roof deck, providing excellent wind resistance.
This underlayment is ideal for regions prone to ice damming or where water accumulation is a concern, such as valleys and roof protrusions. Due to its superior waterproofing qualities, rubberized asphalt is often used in critical areas rather than over the entire roof.
It's not always obvious, but there are key indicators that can signal when your roof needs some attention. This is also the case for the non-visible layers like the underlayment.
If you know how to check for the damage you can have an idea whether you need a replacement or not.
One of the most straightforward signs that your underlayment may need replacing is the presence of water damage or leaks inside your home. If you notice water stains on your ceilings or walls, it's a clear indicator that water is breaching your roof’s defenses.
While tiles might be the first line of defense, the underlayment is what really keeps the water out. When it fails, moisture finds its way in, which can lead to costly interior damage.
While inspecting the tiles themselves might seem more related to the tiles than the underlayment, these signs can also indicate underlying issues. Cracked or missing tiles can expose the underlayment to direct sunlight and weather elements, accelerating its degradation.
If you start noticing an unusual amount of tile damage, it could be a sign that the underlayment is no longer providing the support and protection it should.
A sagging appearance in the roof is a red flag that should not be ignored. This can be a sign that the decking, supported by the underlayment, has been exposed to moisture for an extended period.
The constant presence of moisture can weaken the decking material, leading to a sagging or warping appearance. This structural compromise not only puts your roof at risk but can also affect the overall integrity of your home.
If you find yourself repeatedly addressing roof repairs, especially after every bout of severe weather, it might be a sign that your underlayment is failing. A well-functioning underlayment should offer a certain level of robustness against routine weather challenges.
Frequent repairs can indicate that the underlayment is no longer performing effectively, allowing more frequent and extensive damage to the roof tiles and structure.
Replacing the underlayment on your roof is a significant undertaking that requires careful planning and preparation. The right preparation can make the difference between a job well done and one that might need revisiting sooner than expected.
Timing is everything when it comes to roof work. Ideally, you want to schedule the replacement during a period of mild weather.
Extreme conditions—whether hot or cold—can complicate the installation of underlayment and roofing materials. Most professionals recommend undertaking roofing projects during the spring or fall when the weather is generally more predictable and temperate.
The choice of underlayment material is critical and should be influenced by the climate in which you live. Different materials perform better in different environments.
For instance, synthetic underlayments are often preferred in wet climates due to their superior moisture resistance, while felt might be adequate in drier regions. Consider also the longevity and durability of the materials.
Before you start, remember that roof work can be dangerous. Prioritize safety by using proper equipment and, if necessary, consider hiring professionals.
If you choose to proceed on your own, here’s how to replace the underlayment beneath your tile roof.
Safety cannot be overstated when it comes to working on a roof. Ensure you have a sturdy ladder, non-slip footwear, gloves, and safety goggles. Consider using a safety harness if the roof is particularly steep or high.
Clear the area around your home of any objects or debris to keep the work zone safe and unobstructed.
Start by carefully removing the tiles. Begin at the ridge or peak of the roof and work your way downwards.
Use a flat pry bar to lift the tiles gently, being careful not to crack or break them. It’s wise to have extra tiles on hand in case some do break.
Stack the removed tiles neatly away from the work area. Ensure they are on stable ground to prevent any accidents or additional breakage.
Once the tiles are removed, inspect the roof deck. Look for any signs of damage such as rot or structural weakness.
This is crucial as installing new underlayment over a compromised deck can lead to future problems. Next, remove the old underlayment, it may be nailed or stapled down.
Use a roofing shovel or scraper to remove it, being careful not to damage the roof deck.
Start from the bottom of the roof and work your way up. Roll out the new underlayment horizontally across the roof, overlapping each layer by at least 6 inches.
This overlap is critical for preventing water infiltration. Secure the underlayment with roofing nails or staples.
Make sure it lies flat and smooth against the roof deck.
Begin replacing the tiles from the bottom of the roof. Make sure each tile aligns correctly with those next to it. Misalignment can lead to gaps and potential leaks.
Use new fasteners to secure the tiles. Avoid reusing old nails or staples as they may not hold as securely after being removed.
While many home improvement tasks are manageable on your own, replacing roof underlayment might be a project where enlisting professional help is prudent. A well-chosen expert can ensure that the job is done efficiently and correctly, protecting your home for many years to come.
Understanding the scope and risks associated with replacing underlayment can help you decide whether to tackle the job yourself or hire a professional. Consider the following:
Evaluate your skills and experience. If you have experience with roofing projects and feel comfortable working at heights, you might handle some or all of the task yourself. However, if you're unsure about any part of the process, professional help is advisable.
Assess the project’s complexity. If your roof has multiple levels, steep slopes, or requires extensive repairs, these complexities are often best handled by a professional.
Choosing the right contractor is crucial for ensuring your roof’s longevity. Here are essential factors to consider:
Once you’ve selected a contractor, there are a few steps you can take to prepare for their arrival and the start of the project:
Your roof has many components that have specific needs and maintenance requirements. With new underlayment securely in place, your roof's durability against weather and wear greatly improves even during those stormy months.
If you're considering clay roof tiles, the choice of underlayment becomes even more impportant. Clay tiles are known for their longevity and ability to enhance the thermal efficiency of your home.
However, their performance hinges on the support that only a strong, properly installed underlayment can provide. With an underlayment in good condition, you maximize the protective benefits of clay tiles.
