Does Roll Roofing Need Underlayment?

The roof is an essential part of a building. It does not just protect the house from the elements but also adds beauty to the structure. There are different types of roofing materials used for houses in Princeton, one of which is asphalt roll roofing. The use of underlayment with roll roofing is a frequently asked question. We will be discussing why you should choose to use an underlayment or not.

Roll Roofing

Roll roofing is a roofing material made out of asphalt and used for low sloped roofs. Roll roofing is formed out of the same material used for asphalt shingles. Roll roofing is built from asphalt, fiberglass, and granular stones. Roll roofing, unlike asphalt shingles, is lightweight and is packaged in rolls.

Roll roofing is predominately inexpensive because it weighs less than shingles and can be acquired easily. Also, roll roofing, though similar to asphalt shingles, is less durable. Asphalt insulates from water and dust, and this is why it is used as a roofing material. Roll roofing sheets usually have a width of 36 inches and a length of 33 feet.

Homeowners can easily install rolled roofs themselves but are advised to employ a Princeton roofing company to help them with it. Those who wish to install roll roofing just need to lay the roll on the building, nail it to the structure, and apply adhesives.

It can be used for residential areas and also for utility structures. Structures it can be used for include sheds, garages, and other external structures.


Underlayment is a water-resistant material placed beneath roofing material. It is made with felt paper with asphalt as part of its surface. There are many synthetic variations of the underlayment to match different roofing types. The different kinds of underlayment are:

asphalt-saturated underlayment;

synthetic underlayment;

rubberized asphalt underlayment.

It is the first roofing material fixed on the roof deck before other roofing materials are added. Underlayment is advised for roof installation in Princeton for houses with low sloped roofs and other areas that are at risk of getting waterlogged. It is also designed for different severe weather conditions. Some forms of underlayment are suitable for areas with heavy rainstorms, ice, and snow. Underlayment that could be used for some specific parts of the house includes underlayment for leaves, valleys, chimneys, vent pipes, and other areas open to the effects of the weather.

Why You Need an Underlayment

Underlayment is necessary for several reasons, some of which includes:

  • It’s an extra sheet of protection for your roof deck.
  • It’s fire-resistant.
  • It protects your roof deck from water damage caused by rain or water heaters.
  • It serves as a shield for the asphalt shingle.
  • An underlayment extends the lifespan of roll roofing.
  • It forms a shield around the nails used for the roof decking and protects the edges and joints.

As earlier stated, roll roofing is not as durable as asphalt shingles and has a shorter lifespan, hence the need for an underlayment. People wonder if rolled roofing needs an underlayment because it is required in roofs with low slopes specifically. But underlayment is an essential aspect of a roofing project, where one involves asphalt shingles or roll roofing. For issues concerning roofing and what materials to use, contact a local Princeton company that offers roofing services. You can also make a solarium with the remaining roof material.

Legacy Service USA LLC gives home improvement advice, roofing-related advice and are available in Princeton. They have an A+ rating from the Better Business Bureau and have been in business since 2005.

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