Roofing underlayments are a layer of material installed under the roof covering that serves as an extra layer of protection for the roof deck. The type of underlayment used can vary depending on the type of roof covering and the specific needs of the building. Here are some common types of underlayment used for different roof coverings:
Asphalt-saturated felt: This is a traditional type of underlayment made from felt paper that has been saturated with asphalt. It is often used as an underlayment for asphalt shingles, but it can also be used with other types of roof coverings such as wood shingles or shakes. Asphalt-saturated felt provides a moisture barrier and helps to prevent wind-driven rain from infiltrating the roof deck.
Rubberized asphalt: Rubberized asphalt underlayment is made from asphalt that has been modified with rubber additives. It is more flexible and resistant to tearing than traditional asphalt-saturated felt, making it a good choice for use on roofs with complex shapes or in areas prone to high winds. Rubberized asphalt underlayment is often used with metal roofing systems.
Synthetic underlayment: Synthetic underlayments are made from a variety of synthetic materials such as polypropylene or polyethylene. They are lightweight, durable and resistant to tearing and moisture. Synthetic underlayments are often used with metal roofing systems or in areas where high winds are a concern.
Self-adhering underlayment: Self-adhering underlayment is made from a layer of rubberized asphalt that is backed with a layer of peel-and-stick adhesive. It is designed to be easily installed without the need for nails or staples. Self-adhering underlayment is often used on low-slope roofs or in areas where it is difficult to access the roof deck.
It's important to choose the right type of underlayment for your roof based on the specific needs of your building and the type of roof covering you are using. A professional roofing contractor can help you determine the best type of underlayment for your project.
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