Is Roofing Underlayment Necessary?

Most residential roofing systems can benefit from having a subfloor layer between the roofing materials and the roof covering. This is true for everything from asphalt shingles to metal roofs, although it is not absolutely essential for all roofs. A solid base is necessary to keep the roof intact in the face of strong gusts of wind, rain, snow, leaks and water damage. Local building codes will determine if a roofing subfloor is required and what type should be installed.

Contact a local roofing contractor for more information. The roof subfloor is what is found between the shingles and the roof covering, or roof covering, which is generally made of plywood or OSB. It provides a secondary layer of protection against the elements, such as rain, snow and wind. It generally does not break and, in some cases, is suitable for long-term exposure to UV rays and moisture.

This type of subfloor for ceilings was the preferred option until about 15 years ago, when the popularity of synthetic products began to increase. A disadvantage of the traditional subfloor for felt roofs is that it generally cannot be left exposed for more than a few hours. This subfloor for roofs usually has a special backing with a protective membrane, which is removed before installation. This type of subfloor is designed to protect the roof from damage in areas prone to leaks, such as eaves, valleys, ventilation ducts, chimneys and skylights. To improve water resistance and protection against the elements, many roofers choose to use a synthetic subfloor for roofs.

Investing in a roofing subfloor will help you avoid leaks and more severe repairs if something happens to your home. It is ideal for steeply sloped roofs where water can drain, but cannot be used for flat surfaces where water can seep in and cause damage. Multiple layers are needed to perform these functions and no layer is more important than the bottom layer, which helps keep the entire roof structure dry and protected from moisture. These areas are prone to severe storms and tornadoes, heavy snow accumulation, hail, and strong winds, all of which can damage the roof and cause leaks in the house. It also creates a non-slip surface, designed to make the installation safer for roofers, as it might be easier for them to walk on it.

This type of subfloor contains high percentages of asphalt and rubber polymers, making it a waterproof solution for the lower layer of roofs.

Garry Hesler
Garry Hesler

Freelance pop culture guru. Roofing contractor. Friendly food practitioner. Total travel evangelist. Freelance travel ninja. Proud musicaholic.