Selecting The Right Underlayment For Your Roof


Selecting The Right Underlayment For Your RoofShingles underlayment is installed as a protective barrier between the shingles and the roof frame. Typically, you will have professionals installing the roof. Nonetheless, it pays to have an intricate understanding of the various underlayment options you have. Choosing the right underlayment will help minimize the repairs and maintenance of your roof. Importantly, the right underlayment will extend the life of your roof, thereby giving you more bang for your buck.


Underlayment Options


The felt one is made or organic felt saturated with asphalt. In some varieties of felt underlayment, it uses fiberglass as a reinforcement which increases its longevity and strength. Typically, the more asphalt is saturated into the felt, the more durable and better the quality of the underlayment. However, you should note that this high-quality comes at a higher price. Since asphalt is the most expensive input that goes into the product, it makes sense that the more asphalt is used potentially the more expensive it is, and vice versa.

Asphalt-saturated felt underlayment is typically water-resistant, but only for some time. After it starts to wear off, it becomes permeable to water. As such, it is best used in steep-sloping roofs. Steep slopes allow water to run-off quickly unlike flatter roofs where water stands for long. Other potential problems you might experience when using asphalt-saturated felt underlayment include wrinkling and tears. Moreover, when the material is exposed to direct sunlight, the asphalt is depleted much faster.

This material is generally cheaper than other materials. However, if you are interested in total water resistance, high-quality, and durability, this is not the material for you.


There are several types of materials that have rubber-like properties. For instance, the rubberized asphalt is a material made of a polymer that is modified with bitumen – a mixture of hydrocarbons. The bitumen gives the material plastic or rubber-like properties. Rubberized asphalt is elastic and flexible, allowing the material to fill around staples and nails. It is also self-healing.

This type is a better choice to use in hot climates than felt. It is resistant to moisture penetration and weathering


The synthetic one is made of polypropylene or polyethylene. This type of underlayment is by far the most popular underlayment owning to its properties and qualities. For starters, it is fully waterproof but also breathable. This means that it resists water penetration but allows humidity to escape. It also has a higher safety rating than felt. It is also better at protecting the roof frame from rain, wind, and ice, which makes for a very effective barrier between the roof frame and the shingles.

Another quality that makes it advantageous is its durability. Synthetics tend to have a higher percentage of polymer modifier and asphalt. This gives the material exceptional durability. This lightweight underlayment material can also withstand UV radiation and fungus and it does not wrinkle.

Fire-Resistance Ratings

It is important to consider the fire-resistance rating of the materials you choose. As such, you should always check the rating before making a purchase, especially with regards to flame ratings. While the materials tend to offer the same smoke protection, their flame protection differs significantly. The ratings are classified as A, B, or C with the A offering the best flame resistance and C offering the least fire-resistance.

Generally speaking, the type of underlayment you use, and, therefore, the price of the underlayment will not break or make your budget. The price differences of the underlayment options tend to be a few hundred dollars. When compared to the thousands of dollar your roof costs, it is probably best to choose a higher quality underlayment material that is more durable and offers better water-resistance.

Southern Star Roofing is your to-go-to Charlotte shingles underlayment source and installers. We are here to help you choose your underlayment, install it, and install your roof as well.

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