For enhanced water-resistance and protection from the elements, many roofers are choosing to go the route of synthetic roofing underlayment. These products are usually made from long-lasting polymers, which provide added strength and longevity.
Felt roofing underlayment is a traditional material that has been used for decades and is still a popular choice for many roofing projects. Felt is made from either organic or synthetic materials, and is designed to provide a durable, waterproof barrier between the roof deck and the shingles.
There are various types of roofing underlayment or underlayment materials. In the past, tar-paper was the standard, and I still occasionally come across old roofs that have it. However, today, fiberglass felt (sometimes called felt paper) and polypropylene/polyethylene are the industry standard.
Unlike traditional asphalt felt, peel and stick roof underlayment doesn't wrinkle, which minimizes the risk of water pooling and penetrating the roof barrier below. Additionally, the absence of nail holes provides a more effective barrier against moisture.
Underlayment also creates a smooth surface for installing shingles or tiles, guaranteeing a secure and consistent fit. On average, a roof underlayment lasts for 15 to 20 years.
After all, the smallest mistake can cause the biggest mishaps for your roofing system and yourself as the homeowner. With that in mind, when replacing your roof, one of the things that you should make sure will be done is to completely remove and replace the old underlayment.
This is another great choice for walkability—featuring a specially designed surface to make it safer—and also for durability. TigerPaw is up to 600% stronger than #30 asphalt felt, and while it isn't completely waterproof, it is highly water-resistant.
With so many options available, it can be difficult to decide which material is the right fit for your project. However, three main choices have become popular over the years in MLM Home Improvement projects: membrane roofing, rolled roofing, and architectural shingles.
The Right Underlayment for Your Roof
Synthetic roofing underlayment has many advantages over felt and may be a worthwhile investment to protect your roof and home from the risks of water and moisture infiltration.
Signs that your roofing felt is failing include visible damage, leaks, and water stains on your ceilings or walls. The lifespan of roofing felt can change based on the type of material, how well it was installed, and the environment. Regular roof inspections are important.
It comes in two different weights: 15- and 30-pound, with 30-pound being the more durable, heavy option. Synthetic roofing underlayment is typically made from durable polymers that are created to be water-resistant and easy to work with. Many roofing contractors prefer to use synthetic roofing underlayment over felt.
Alternatives to roofing felt include synthetic underlayments and EPDM rubber roofing, both offering unique advantages. Proper installation is crucial for the effectiveness and longevity of any roofing material.
The classic type of roof underlayment is known as asphalt-saturated felt. It's similar to tar paper, except that the waterproofing ingredient is asphalt instead of tar. This style of roof underlayment installation has been used for decades to provide adequate moisture protection and insulation.
High-quality roofing felt lowers fire risks. Modern fire rating testing for shingles almost always requires roofing felt underlayment. If you don't have roofing felt, those shingles may not provide the same level of fire protection you expect. As a result, your building may not meet fire requirements in your area.
Directly beneath the shingles is something called “underlayment,” also known as “roofing felt.” As you may have guessed, underlayment is usually either made of fiberglass paper or felt. It covers the entire roof deck.
Traditional Roof Felt (20-30 lbs): Standard felt underlayment typically lasts between 15 to 20 years when it is correctly installed and well-maintained. However, some may degrade sooner in harsh climates.
RhinoRoof is a product manufactured by a subsidiary of Owens-Corning and is 12x stronger than traditional 30-pound (#30) felt. It's a synthetic roof underlayment that is almost impossible to tear by human hands. Another benefit of using RhinoRoof is that it lays flat, will not wrinkle and won't absorb water.
Synthetic roofing underlayment will have a warranty that ranges from 25-50 years, while felt underlayment only lasts 12-20 years. In addition, synthetic underlayment can be left exposed for months. Conversely, felt cannot be left exposed for long periods of time.
More is not always better, and with underlayment, too much can compromise the integrity of your floor's locking system. Adding additional underlayment under vinyl with an attached pad can create too much cushioning, which causes the floor to come apart through use over time.
It's not always necessary to tear off and remove the old roofing felt. But remember, if you are installing a whole new roofing system, removing the old one might be best.
Remember, roof underlayment protects your decking if water ever gets underneath your roofing material. Without underlayment, this water eventually rots your roof decking leading to leaks, mold/mildew forming, and even structural damage.
As your roof ages, so does its underlayment. Most experts recommend replacing underlayment every 20-25 years, depending on the material used.