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Roofing Basics: How To Install A Roof Underlay Properly?

Installing a roof underlay is an essential part of any roofing job. If it is not done correctly, the roof could leak or come off in a storm.

Roof underlayment is a water-resistant/waterproof barrier material installed on the roof deck before installing the roofing shingles. Underlayment provides an extra layer of protection between the shingles and the roof deck, and it also helps prevent wind-driven rain from entering the house.

There are several different types of underlayment available, but most homeowners choose to use synthetic underlayment because it is lightweight and easy to install. Some newer types of synthetic underlayment also come with a built-in vapor barrier, which helps to keep moisture from accumulating underneath the shingles. While building codes do not require underlayment in all areas, roofing professionals always recommend it.

Different Types Of Roof Underlayment

Several types of roof underlayment are available, each with its advantages.

Asphalt-Saturated Felt:

Asphalt-saturated felt is one of the most popular options, as it is relatively inexpensive and easy to install. However, it is also susceptible to damage from UV radiation, so it may need to be replaced more frequently than other options.

Synthetic Underlayment:

Synthetic underlayment is another popular choice, as it is less likely to be damaged by UV radiation. However, it is more expensive than asphalt-saturated felt, and it can be more challenging to install.

Metal Roofing Underlayment:

Metal roofing underlayment is a good choice for areas prone to high winds, as it provides extra protection against wind damage. However, it is more expensive than both asphalt-saturated felt and synthetic underlayment, and it can be more challenging to install.

Installing A Roof Underlay

When installed correctly, a roof underlay can significantly extend the life of a roof. However, it can also void the warranty on the roofing system and lead to leaks and other problems. To ensure that the underlay is installed correctly, follow these steps:

  • Measure the length and width of the area to be covered.
  • Put the underlay to size using a sharp knife or scissors.
  • Apply a bead of sealant along the edges of the underlay.
  • Press the underlay into place, ensuring it is flush with the roof’s edges.

If you are installing an asphalt shingle roof, you will need to install a layer of felt paper before installing the shingles. This will help to prevent leaks and extend the life of the roof.

Tips For A Successful Installation

Roofing underlay proper installation is essential to ensure a long-lasting, leak-free roof. While the installation process may vary depending on the roofing system, some general tips can help ensure a successful outcome.

  • First, it is important to ensure that the surface is clean and free of debris before installing.
  • Second, all joints and seams should be properly sealed using a quality sealant.
  • Third, you should install the underlay to allow any water penetrating the roofing system to drain away from the building.

By following these simple tips, you can help to ensure a successful roofing underlay installation.

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