What Goes Under Roofing Shingles

The material placed beneath roofing shingles is called a roofing underlayment. It gives an additional layer of protection between the roof deck and the shingles, making it an essential component of any roofing system. The two types of roofing underlayment most frequently utilized are felt paper and synthetic. Both materials are designed to prevent water from entering the home and act as an additional line of defense against rain brought on by the wind. 

Due to its enhanced performance qualities, such as its resistance to ripping and capacity to tolerate high temperatures, synthetic underlayment is becoming increasingly popular. Spending money on high-quality roofing underlayment is essential if you want a robust roof that will last.

Every roof needs roofing shingles, but there are other materials beneath them. The components of a properly constructed and maintained roofing system shield your property from the elements. Under the asphalt shingle roofing, they are situated.

  • Plywood Sheathing 

Underneath the roofing shingles is a crucial component called plywood sheathing. It offers a stable foundation for the shingles to be fastened to and aids in equally dispersing the roof’s weight. The strength and longevity of the roof can be affected by the thickness and quality of the plywood sheathing. 

For the specific roofing project, utilizing the right type and thickness of plywood sheathing is crucial. Doing this will ensure that the roof has the necessary support and can endure severe weather. Plus, plywood sheathing helps to keep out moisture and shields the building’s interior from water damage.

  • Felt Paper 

Felt paper is an indispensable component that goes under roofing shingles. It is a thin, tar-saturated material applied to the roof deck before the shingles are installed. This layer provides a barrier between the shingles and the roof deck, preventing moisture from penetrating the roof and causing damage. 

Felt paper is also a crucial layer that helps improve the roof’s overall performance, especially in areas with harsh weather conditions. It helps to create a smooth, even surface for the shingles to adhere to, ensuring a tight and secure fit. Professional roofers recommend using high-quality felt paper to enhance the longevity and durability of your roof.

  • Water and Ice Shield 

Water and ice shield are vital components under roofing shingles to protect against water infiltration. This self-adhesive membrane material is applied to the roof deck before installing shingles. It is designed to prevent water seepage in the building. Ice and water shield can be used in all roof areas, but it is principally crucial in areas where ice dams and heavy rain are common. This material is a must-have for any roofing project, as it provides an extra layer of protection against water damage and helps extend the roof’s lifespan.

  • Roofing Felt 

It is a thin layer of asphalt-saturated material that acts as a waterproof barrier against moisture and weather elements. Roofing protects the roof decking from water seepage that can cause severe damage to the underlying structure. 

It also provides an additional layer of insulation, which helps to keep the interior of the building cool in the summer and warm in the winter. It helps to reduce the noise level from rain or hailstorms and provides a smooth surface for the shingles to adhere to.

  • Roof Vents

These vents are designed to allow proper ventilation in the attic space, which helps regulate the temperature and moisture levels in the area. Without proper ventilation, the attic can become hot and humid, developing mold and rot. Roof vents are typically made of durable materials such as aluminum or stainless steel and come in various shapes and sizes to suit different roofing styles. 

Professional roofing contractors recommend installing roof vents during roofing installation or replacement to ensure adequate ventilation and prevent potential damage to the roof and attic space.

Tips On How to Select What Goes Under Roofing Shingles

Selecting what goes under roofing shingles is crucial to a roof’s overall quality and longevity. A solid foundation is necessary to ensure the shingles are properly supported and protected from the elements. Here are the tips to help you choose suitable materials to go under your roofing shingles.

  • Consider the climate

The climate in your region will play a significant role in what goes under your roofing shingles. If you live in an area with heavy rain or snow, you’ll want to choose materials that can withstand moisture and prevent leaks. In contrast, if you live in a hot and dry climate, you’ll want to choose materials that can help to insulate your home and keep it cool.

  • Evaluate the slope of the roof

The roof’s slope is the angle at which it rises from the horizontal. Evaluating the roof’s slope is essential because it determines what type of underlayment is needed to provide adequate protection against moisture. 

For roofs with a low slope, typically less than 3:12, a self-adhering modified bitumen membrane is recommended. This underlayment is made from asphalt and has a sticky underside that adheres directly to the roof deck. It provides excellent protection against moisture and can withstand the extreme heat and cold the roof may be exposed to.

  • Consider A Material That Complements the Overall Design

Choosing a material that complements the design of the building and enhances its visual appeal is crucial. For instance, if the building has a traditional design, it is advisable to opt for a classic material, such as asphalt felt or synthetic underlayment. 

These materials have a timeless appeal and are ideal for buildings with a traditional or historic design. On the other hand, if the building has a modern design, it is best to choose a sleek and contemporary material, such as synthetic underlayment with polyethylene.


Water Damage and Roofing of Round Rock is located at 30 Woodland Ln, Round Rock, TX. From Austin-Bergstrom International Airport(AUS) head east toward E McNeil Rd, and then turn left toward S Brown St. Continue straight onto S Brown St and then turn right onto E McNeil Rd. Turn left at the 2nd cross street onto S I-35 Frontage Rd/Morrow St and then take the ramp on the left onto I-35 S. Merge onto I-35 S. Afterwards, take the exit toward US-183 Hwy S and then take the ramp to U.S. 183 S. Merge onto US-183 Hwy S and then keep left to continue on 183 Toll. Continue onto S Hwy 183 (signs for Texas 71 W/Ben White Blvd/Riverside Dr) and then use the left 2 lanes to turn left to merge onto State Hwy 71 E. Exit onto Spirit of Texas Dr and after 0.4 miles you have arrived at Water Damage and Roofing of Round Rock.

We are open 24/7.

For additional questions, call us at (512) 566-5511.

Always entrust your roofing services needs to professionals and certified contractors who value customer satisfaction and excellence.

Water Damage & Roofing of Round Rock is located in Round Rock, Texas. We can be reached on Yellow Pages and Go My Local. If you would like a more personalized experience you can call us at (512) 566-5511 any hour of any day.

We value the needs of our clients and we always make sure that we meet them with utmost care and excellent results.

No matter how simple the roofing service may be, our highly skilled and trained staff members always give their best.